Code
P1634
BMW
P — Powertrain
Throttle Valve Adaptation Spring Test Failed
Views:
UK: 20
EN: 44
RU: 37
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
BUICK
P — Powertrain
Ignition 1 Power Circuit Low Voltage
Views:
UK: 22
EN: 34
RU: 30
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
CADILLAC
P — Powertrain
Ignition 1 Power Circuit Low Voltage
Views:
UK: 18
EN: 35
RU: 30
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
CHEVROLET
P — Powertrain
Ignition 1 Power Circuit Low Voltage
Views:
UK: 19
EN: 33
RU: 34
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
CITROEN
P — Powertrain
Ignition-on ECU supply control short circuit to positive
Views:
UK: 3
EN: 12
RU: 2
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
DAEWOO
P — Powertrain
Cruise lamp fault
Views:
UK: 3
EN: 12
RU: 1
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
DAIHATSU
P — Powertrain
EFI (main) CPU abnormal
Views:
UK: 2
EN: 11
RU: 0
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Send to email
Code
P1634
DS
P — Powertrain
Ignition-on ECU supply control short circuit to positive
Views:
UK: 2
EN: 10
RU: 0
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
FORD
P — Powertrain
Data Output Link Circuit Failure
Views:
UK: 19
EN: 38
RU: 33
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
GM
P — Powertrain
Ignition 1 Power Circuit Low Voltage
Views:
UK: 21
EN: 41
RU: 43
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
GMC
P — Powertrain
Ignition 1 Power Circuit Low Voltage
Views:
UK: 23
EN: 36
RU: 28
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
HUMMER
P — Powertrain
Ignition 1 Switch Circuit
Views:
UK: 8
EN: 23
RU: 4
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
KIA
P — Powertrain
Alternator B Open 1.8L
Views:
UK: 17
EN: 35
RU: 28
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
LAND ROVER
P — Powertrain
accelerator watchdog circuit failure
Views:
UK: 5
EN: 19
RU: 3
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
LINCOLN
P — Powertrain
Data Output Link Circuit Failure
Views:
UK: 19
EN: 40
RU: 33
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P1634
MAZDA
P — Powertrain
Generator Terminal B Circuit Open
Views:
UK: 20
EN: 38
RU: 29
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
MERCURY
P — Powertrain
Data Output Link Circuit Failure
Views:
UK: 19
EN: 32
RU: 27
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
OLDSMOBILE
P — Powertrain
Ignition 1 Power Circuit Low Voltage
Views:
UK: 19
EN: 38
RU: 30
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
Other
P — Powertrain
Data Output Link Circuit Failure
Views:
UK: 22
EN: 36
RU: 33
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
PEUGEOT
P — Powertrain
Ignition-on ECU supply control short circuit to positive
Views:
UK: 2
EN: 10
RU: 0
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
RAM
P — Powertrain
TCM Internal - Internal Watchdog Performance
Views:
UK: 2
EN: 10
RU: 2
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
SATURN
P — Powertrain
Ignition 1 Power Circuit Low Voltage
Views:
UK: 25
EN: 44
RU: 36
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1634
VOLKSWAGEN
P — Powertrain
Accelerator Pedal Position Sensor 2 Signal Too High
Views:
UK: 19
EN: 49
RU: 30
AI status
Completed
Completed
100%
Causes
- Mechanical binding or wear in the throttle body (sticking plate or broken/weak return spring)
- Faulty throttle valve actuator or position sensors
- Wiring or connector faults (power, ground, sensor signals)
- Battery/charging system voltage low during adaptation
- Contaminated throttle body (carbon build-up) preventing full travel
- DME software or calibration error
Symptoms
- Check Engine Light / MIL illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response
- Irregular or high idle, stalling, or surging
- Throttle-related warning message on dash (BMW specific)
- Code returns after clearing or fails during adapt/relearn
What to check
- Read all stored and pending codes, note freeze-frame data and related codes
- Check battery voltage (at rest and while cranking); ensure good charge and connections
- Visually inspect throttle body for carbon buildup, binding, or physical damage
- Inspect wiring and connector to throttle module for corrosion, loose pins, or damage
- Attempt a throttle adaptation/relearn with a factory-level scanner (BMW ISTA/INPA) and note failure stage
- Check for other powertrain or CAN communication errors that might affect adaptation
Signal parameters
- Battery/charging voltage: ~12–14.8 V during adaptation
- Throttle position sensor (TPS) voltages: closed ~0.4–1.5 V, wide open ~3.5–4.5 V (two redundant sensors should correlate)
- Throttle actuator control current: short duration peaks during movement (tool-dependent)
- Adaptation/learn counters/values reported by BMW diagnostic tool (should be within manufacturer limits)
- CAN/DME communication present and error-free for throttle module
Diagnostic algorithm
- Read and record all codes and freeze-frame; clear codes and attempt one full ignition cycle to see if code returns.
- Confirm battery is fully charged and charging system is healthy; retry adaptation if battery was low.
- Perform visual inspection: remove intake ducting and inspect throttle plate and bore for carbon or obstruction; move throttle plate by hand (with ignition off) to check for free movement and spring return.
- Use BMW diagnostic software to run the throttle adaptation / spring test and observe live data and error stage to identify whether failure is mechanical or electrical.
- With appropriate safety measures, monitor TPS voltages and actuator signals with a scope or multimeter while commanding throttle moves from the diagnostic tool; verify redundant sensor correlation and expected voltage ranges.
- Check wiring continuity, power, and ground at the throttle module connector; wiggle test while monitoring signals to find intermittent faults.
- Clean the throttle body if heavy deposits are present; retest adaptation after cleaning.
- If actuator motor or internal spring is faulty (mechanical resistance, no movement, incorrect adaptation values), replace the throttle body assembly with a programmed/learnt unit as required by BMW procedures.
- After repair or replacement, perform full throttle adaptation/relearn using factory diagnostic tool; clear codes and confirm no recurrence during test drive.
- If code persists after verified mechanical/electrical repairs, check DME software level and consider reflash or DME fault diagnosis.
Likely causes
- Sticking throttle plate due to carbon/deposits
- Failed throttle return spring or internal mechanical fault in throttle housing
- Throttle actuator motor failure or high internal friction
- Damaged/shorted/open throttle position sensor(s) or incorrect sensor/voltage readings
- Poor battery voltage or weak battery during adaptation/relearn
- Faulty wiring harness or poor connector at throttle module (corrosion, bent pins)
Fault status
Status
Throttle valve adaptation spring test failed — DME detected invalid or out-of-range result during throttle spring/adaptation self-test; adaptation incomplete and throttle control may be restricted.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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0
Send to email