Code
P1513
ALFA ROMEO
P — Powertrain
Idle speed regulator fault
Views:
UK: 2
EN: 6
RU: 9
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1513
BMW
P — Powertrain
DISA Control Circuit Signal High
Views:
UK: 20
EN: 35
RU: 33
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1513
DAEWOO
P — Powertrain
IDLE CHARGE ACTUATOR( FUNC FLT)
Views:
UK: 1
EN: 5
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1513
FIAT
P — Powertrain
Idle speed regulator fault
Views:
UK: 2
EN: 6
RU: 9
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1513
FORD
P — Powertrain
Intake Manifold Runner Control Stuck Closed
Views:
UK: 23
EN: 45
RU: 35
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1513
KIA
P — Powertrain
Idle Air Control Valve Closing Coil Low Voltage
Views:
UK: 21
EN: 39
RU: 35
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1513
LINCOLN
P — Powertrain
Intake Manifold Runner Control Stuck Closed
Views:
UK: 22
EN: 36
RU: 34
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1513
MERCURY
P — Powertrain
Intake Manifold Runner Control Stuck Closed
Views:
UK: 21
EN: 37
RU: 36
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1513
MITSUBISHI
P — Powertrain
Remote control engine starter
Views:
UK: 8
EN: 24
RU: 18
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1513
Other
P — Powertrain
Intake Manifold Runner Control (Bank 2) Stuck Closed
Views:
UK: 20
EN: 35
RU: 31
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Workshop ManualYour experience will help others
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Code
P1513
PORSCHE
P — Powertrain
Idle control valve opening coil
Views:
UK: 0
EN: 4
RU: 7
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1513
RAM
P — Powertrain
Starter Request Switch Stuck
Views:
UK: 2
EN: 2
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Was this AI description helpful?
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Code
P1513
SAAB
P — Powertrain
Idle Air Control Valve, Open Function, Control Module Output, Short To Ground
Views:
UK: 1
EN: 3
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1513
SUBARU
P — Powertrain
Idle Air Control Solenoid Signal 2 Circuit High Input
Views:
UK: 18
EN: 35
RU: 31
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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0
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Code
P1513
VOLKSWAGEN
P — Powertrain
Intake Manifold Changeover Valve 2 Circuit Short To B+
Views:
UK: 21
EN: 39
RU: 36
AI status
Completed
Completed
100%
Causes
- Faulty idle speed regulator (idle air control valve or stepper motor)
- Open/shorted wiring or poor connector/ground to the actuator
- Blocked or dirty throttle body / idle passages
- Intake vacuum leak or leaking EGR system
- Faulty throttle position sensor (TPS) or related sensors (ECT, MAF)
- Low battery/poor charging voltage or blown fuse/relay
Symptoms
- Malfunction Indicator Lamp (MIL) or engine light illuminated
- Unstable or hunting idle (RPM fluctuates)
- Idle too high or too low; engine may stall at idle
- Poor cold-start idle or long stumble after start
- Reduced driveability and possible limp-home behavior
What to check
- Read and note freeze-frame data and related codes with a capable scan tool
- Visual inspection of idle actuator connector, wiring harness and grounds for damage or corrosion
- Check battery voltage and charging system condition; verify relevant fuses and relays
- Attempt to command the idle actuator on/off or to target duty cycle via scan tool and observe response
- Inspect and clean throttle body and idle air passages if carboned
- Perform a vacuum/leak smoke test on the intake
Signal parameters
- Target idle RPM: typically ~650–900 rpm (verify model-specific value)
- Idle actuator control signal: PWM duty cycle or control voltage — expected to vary with load (0–100% duty typical)
- Actuator supply voltage: approx. battery voltage when powered (11–14 V normal), control circuits may be 0–12 V or 0–5 V depending on design
- Actuator coil/stepper resistance: check manufacturer spec (typical range ~5–40 Ω) — measure for open/short
- TPS voltage at closed throttle: manufacturer-specific (typically ~0.2–1.0 V) — verify smooth change with throttle movement
Diagnostic algorithm
- Retrieve and record fault code(s), freeze-frame and live data. Note related codes (TPS, MAF, ECT, intake leaks).
- Inspect battery, charging system, relevant fuses and relays. Low voltage can cause actuator faults.
- Visually inspect idle actuator connector and wiring for damage, corrosion, loose pins or poor grounds. Wiggle test while monitoring for changes.
- With scan tool, command the idle actuator through its range and observe actuator movement and RPM response. If no response, measure control voltage/duty cycle at the connector while commanding.
- Measure actuator coil/stepper resistance against spec; check for short to ground or open circuit.
- Clean the throttle body and idle air passages if carbon is present, then re-test. Relearn idle adaptation if required by procedure.
- Perform intake vacuum/smoke test to identify leaks. Repair any leaks and re-test idle control.
- Verify TPS, MAF and engine coolant temperature sensor inputs are within expected ranges; replace or repair if faulty.
- If wiring and actuator test good but problem persists, consider ECU software update or ECU fault — consult ALFA ROMEO service information before replacement.
- After repairs, clear codes and perform road/idle test to ensure fault does not return. Confirm proper idle RPM under various loads.
Likely causes
- Carbon-clogged throttle body / idle passages preventing actuator from controlling airflow
- Idle actuator failure (stuck, excessive internal resistance or non-responsive)
- Corroded/damaged connector or earth/ground causing intermittent signal or low voltage
- Large intake vacuum leak causing regulator unable to maintain target idle
- Incorrect TPS signal or other sensor input making ECU command incorrect idle adjustments
Fault status
Status
Idle speed regulator fault — ECU detected improper response or circuit fault in the idle control system. May set MIL and cause unstable or incorrect idle.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 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