Code
P1103
DAEWOO
P — Powertrain
MAP SNSR - HIGH INPUT
Views:
UK: 1
EN: 6
RU: 5
AI status
Completed
Completed
100%
Causes
- MAP sensor internal failure
- Signal wire shorted to 5V (reference) or to another high-voltage source
- Faulty 5V reference or poor sensor ground at the ECM
- Disconnected or damaged MAP vacuum/boost hose (reading atmospheric when vacuum expected)
- Corroded/loose connector or wiring harness damage
- ECM internal fault
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle, rough running or stalling
- Increased fuel consumption or rich/lean running
- Hesitation, poor throttle response or loss of power
- Possible hard start or trouble during load changes
What to check
- Read freeze-frame and live MAP sensor data with scan tool during key-on and while running
- Visually inspect MAP sensor, connector and vacuum/boost hose for damage, disconnection or contamination
- Backprobe MAP sensor connector: measure signal voltage, reference (5 V) and ground with key ON and engine at idle
- Wiggle wiring and connector while monitoring live data to check for intermittent faults
- Compare MAP sensor reading to BARO (ambient) pressure if available — they should be similar with engine off
- Check for related DTCs (e.g., reference or ground circuit faults) and battery/charging system voltage
Signal parameters
- Sensor reference: typically about 5.0 V (check vehicle spec); should be stable with key ON
- Sensor ground: near 0 V with key ON
- Signal voltage at atmospheric pressure (engine off, manifold open to atmosphere): typically ~4.0–4.7 V
- Signal voltage at idle (manifold vacuum): typically ~0.5–2.0 V depending on engine and MAP sensor range
- Signal should vary smoothly with throttle/RPM; spikes or a stuck voltage indicate fault
Diagnostic algorithm
- Retrieve freeze-frame data and note conditions when the fault set (engine load, RPM, temperature).
- Visually inspect MAP sensor, vacuum/boost hose and connector for damage, contamination or disconnection; repair or reconnect as needed.
- With key ON (engine off), backprobe the MAP connector and confirm: stable reference voltage (~5 V), good ground (~0 V) and the signal voltage at expected atmospheric value (~4.0–4.7 V).
- Start engine and observe MAP signal while at idle and during throttle changes. The voltage should drop with manifold vacuum and increase with boost/throttle. If signal stays high or is erratic, proceed.
- If reference or ground is out of range, trace and repair wiring to ECM (check for shorts, corrosion, broken wires).
- If reference and ground are good but signal remains high, disconnect the MAP sensor and check for any voltage present on the signal pin with the sensor removed (should be open/high impedance). Voltage present suggests a wiring/ECM issue.
- If wiring appears good, replace the MAP sensor with a known-good unit and retest.
- After repairs, clear codes, perform test drive under same conditions and verify the code does not return and that live MAP readings are correct.
- If problem persists after sensor and wiring replacement, consider ECM diagnosis or replacement only after confirming wiring and sensor integrity.
Likely causes
- MAP sensor wiring short to battery/ignition feed
- Failed MAP sensor (stuck high or internally shorted)
- Open or high-resistance sensor ground causing abnormal reference reading
- Vacuum hose disconnected so sensor reads atmospheric pressure (appears high during conditions where low voltage expected)
- Intermittent connector contact or corrosion at MAP sensor connector
Fault status
Status
MAP sensor — HIGH INPUT: The MAP sensor signal is above the expected range. Inspect MAP sensor, wiring/connectors, reference voltage and ground; replace sensor or repair harness as required.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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Code
P1103
LAND ROVER
P — Powertrain
Air flow sensor within range, but above expected
Views:
UK: 2
EN: 9
RU: 7
AI status
Completed
Completed
100%
Causes
- MAP sensor internal failure
- Signal wire shorted to 5V (reference) or to another high-voltage source
- Faulty 5V reference or poor sensor ground at the ECM
- Disconnected or damaged MAP vacuum/boost hose (reading atmospheric when vacuum expected)
- Corroded/loose connector or wiring harness damage
- ECM internal fault
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle, rough running or stalling
- Increased fuel consumption or rich/lean running
- Hesitation, poor throttle response or loss of power
- Possible hard start or trouble during load changes
What to check
- Read freeze-frame and live MAP sensor data with scan tool during key-on and while running
- Visually inspect MAP sensor, connector and vacuum/boost hose for damage, disconnection or contamination
- Backprobe MAP sensor connector: measure signal voltage, reference (5 V) and ground with key ON and engine at idle
- Wiggle wiring and connector while monitoring live data to check for intermittent faults
- Compare MAP sensor reading to BARO (ambient) pressure if available — they should be similar with engine off
- Check for related DTCs (e.g., reference or ground circuit faults) and battery/charging system voltage
Signal parameters
- Sensor reference: typically about 5.0 V (check vehicle spec); should be stable with key ON
- Sensor ground: near 0 V with key ON
- Signal voltage at atmospheric pressure (engine off, manifold open to atmosphere): typically ~4.0–4.7 V
- Signal voltage at idle (manifold vacuum): typically ~0.5–2.0 V depending on engine and MAP sensor range
- Signal should vary smoothly with throttle/RPM; spikes or a stuck voltage indicate fault
Diagnostic algorithm
- Retrieve freeze-frame data and note conditions when the fault set (engine load, RPM, temperature).
- Visually inspect MAP sensor, vacuum/boost hose and connector for damage, contamination or disconnection; repair or reconnect as needed.
- With key ON (engine off), backprobe the MAP connector and confirm: stable reference voltage (~5 V), good ground (~0 V) and the signal voltage at expected atmospheric value (~4.0–4.7 V).
- Start engine and observe MAP signal while at idle and during throttle changes. The voltage should drop with manifold vacuum and increase with boost/throttle. If signal stays high or is erratic, proceed.
- If reference or ground is out of range, trace and repair wiring to ECM (check for shorts, corrosion, broken wires).
- If reference and ground are good but signal remains high, disconnect the MAP sensor and check for any voltage present on the signal pin with the sensor removed (should be open/high impedance). Voltage present suggests a wiring/ECM issue.
- If wiring appears good, replace the MAP sensor with a known-good unit and retest.
- After repairs, clear codes, perform test drive under same conditions and verify the code does not return and that live MAP readings are correct.
- If problem persists after sensor and wiring replacement, consider ECM diagnosis or replacement only after confirming wiring and sensor integrity.
Likely causes
- MAP sensor wiring short to battery/ignition feed
- Failed MAP sensor (stuck high or internally shorted)
- Open or high-resistance sensor ground causing abnormal reference reading
- Vacuum hose disconnected so sensor reads atmospheric pressure (appears high during conditions where low voltage expected)
- Intermittent connector contact or corrosion at MAP sensor connector
Fault status
Status
MAP sensor — HIGH INPUT: The MAP sensor signal is above the expected range. Inspect MAP sensor, wiring/connectors, reference voltage and ground; replace sensor or repair harness as required.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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Code
P1103
MAZDA
P — Powertrain
Mass Air Flow Sensor Signal Inconsistent With Engine Speed
Views:
UK: 25
EN: 33
RU: 37
AI status
Completed
Completed
100%
Causes
- MAP sensor internal failure
- Signal wire shorted to 5V (reference) or to another high-voltage source
- Faulty 5V reference or poor sensor ground at the ECM
- Disconnected or damaged MAP vacuum/boost hose (reading atmospheric when vacuum expected)
- Corroded/loose connector or wiring harness damage
- ECM internal fault
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle, rough running or stalling
- Increased fuel consumption or rich/lean running
- Hesitation, poor throttle response or loss of power
- Possible hard start or trouble during load changes
What to check
- Read freeze-frame and live MAP sensor data with scan tool during key-on and while running
- Visually inspect MAP sensor, connector and vacuum/boost hose for damage, disconnection or contamination
- Backprobe MAP sensor connector: measure signal voltage, reference (5 V) and ground with key ON and engine at idle
- Wiggle wiring and connector while monitoring live data to check for intermittent faults
- Compare MAP sensor reading to BARO (ambient) pressure if available — they should be similar with engine off
- Check for related DTCs (e.g., reference or ground circuit faults) and battery/charging system voltage
Signal parameters
- Sensor reference: typically about 5.0 V (check vehicle spec); should be stable with key ON
- Sensor ground: near 0 V with key ON
- Signal voltage at atmospheric pressure (engine off, manifold open to atmosphere): typically ~4.0–4.7 V
- Signal voltage at idle (manifold vacuum): typically ~0.5–2.0 V depending on engine and MAP sensor range
- Signal should vary smoothly with throttle/RPM; spikes or a stuck voltage indicate fault
Diagnostic algorithm
- Retrieve freeze-frame data and note conditions when the fault set (engine load, RPM, temperature).
- Visually inspect MAP sensor, vacuum/boost hose and connector for damage, contamination or disconnection; repair or reconnect as needed.
- With key ON (engine off), backprobe the MAP connector and confirm: stable reference voltage (~5 V), good ground (~0 V) and the signal voltage at expected atmospheric value (~4.0–4.7 V).
- Start engine and observe MAP signal while at idle and during throttle changes. The voltage should drop with manifold vacuum and increase with boost/throttle. If signal stays high or is erratic, proceed.
- If reference or ground is out of range, trace and repair wiring to ECM (check for shorts, corrosion, broken wires).
- If reference and ground are good but signal remains high, disconnect the MAP sensor and check for any voltage present on the signal pin with the sensor removed (should be open/high impedance). Voltage present suggests a wiring/ECM issue.
- If wiring appears good, replace the MAP sensor with a known-good unit and retest.
- After repairs, clear codes, perform test drive under same conditions and verify the code does not return and that live MAP readings are correct.
- If problem persists after sensor and wiring replacement, consider ECM diagnosis or replacement only after confirming wiring and sensor integrity.
Likely causes
- MAP sensor wiring short to battery/ignition feed
- Failed MAP sensor (stuck high or internally shorted)
- Open or high-resistance sensor ground causing abnormal reference reading
- Vacuum hose disconnected so sensor reads atmospheric pressure (appears high during conditions where low voltage expected)
- Intermittent connector contact or corrosion at MAP sensor connector
Fault status
Status
MAP sensor — HIGH INPUT: The MAP sensor signal is above the expected range. Inspect MAP sensor, wiring/connectors, reference voltage and ground; replace sensor or repair harness as required.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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Code
P1103
MITSUBISHI
P — Powertrain
Turbocharger Wastegate Actuator
Views:
UK: 25
EN: 32
RU: 39
AI status
Completed
Completed
100%
Causes
- MAP sensor internal failure
- Signal wire shorted to 5V (reference) or to another high-voltage source
- Faulty 5V reference or poor sensor ground at the ECM
- Disconnected or damaged MAP vacuum/boost hose (reading atmospheric when vacuum expected)
- Corroded/loose connector or wiring harness damage
- ECM internal fault
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle, rough running or stalling
- Increased fuel consumption or rich/lean running
- Hesitation, poor throttle response or loss of power
- Possible hard start or trouble during load changes
What to check
- Read freeze-frame and live MAP sensor data with scan tool during key-on and while running
- Visually inspect MAP sensor, connector and vacuum/boost hose for damage, disconnection or contamination
- Backprobe MAP sensor connector: measure signal voltage, reference (5 V) and ground with key ON and engine at idle
- Wiggle wiring and connector while monitoring live data to check for intermittent faults
- Compare MAP sensor reading to BARO (ambient) pressure if available — they should be similar with engine off
- Check for related DTCs (e.g., reference or ground circuit faults) and battery/charging system voltage
Signal parameters
- Sensor reference: typically about 5.0 V (check vehicle spec); should be stable with key ON
- Sensor ground: near 0 V with key ON
- Signal voltage at atmospheric pressure (engine off, manifold open to atmosphere): typically ~4.0–4.7 V
- Signal voltage at idle (manifold vacuum): typically ~0.5–2.0 V depending on engine and MAP sensor range
- Signal should vary smoothly with throttle/RPM; spikes or a stuck voltage indicate fault
Diagnostic algorithm
- Retrieve freeze-frame data and note conditions when the fault set (engine load, RPM, temperature).
- Visually inspect MAP sensor, vacuum/boost hose and connector for damage, contamination or disconnection; repair or reconnect as needed.
- With key ON (engine off), backprobe the MAP connector and confirm: stable reference voltage (~5 V), good ground (~0 V) and the signal voltage at expected atmospheric value (~4.0–4.7 V).
- Start engine and observe MAP signal while at idle and during throttle changes. The voltage should drop with manifold vacuum and increase with boost/throttle. If signal stays high or is erratic, proceed.
- If reference or ground is out of range, trace and repair wiring to ECM (check for shorts, corrosion, broken wires).
- If reference and ground are good but signal remains high, disconnect the MAP sensor and check for any voltage present on the signal pin with the sensor removed (should be open/high impedance). Voltage present suggests a wiring/ECM issue.
- If wiring appears good, replace the MAP sensor with a known-good unit and retest.
- After repairs, clear codes, perform test drive under same conditions and verify the code does not return and that live MAP readings are correct.
- If problem persists after sensor and wiring replacement, consider ECM diagnosis or replacement only after confirming wiring and sensor integrity.
Likely causes
- MAP sensor wiring short to battery/ignition feed
- Failed MAP sensor (stuck high or internally shorted)
- Open or high-resistance sensor ground causing abnormal reference reading
- Vacuum hose disconnected so sensor reads atmospheric pressure (appears high during conditions where low voltage expected)
- Intermittent connector contact or corrosion at MAP sensor connector
Fault status
Status
MAP sensor — HIGH INPUT: The MAP sensor signal is above the expected range. Inspect MAP sensor, wiring/connectors, reference voltage and ground; replace sensor or repair harness as required.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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Code
P1103
Other
P — Powertrain
MAF Sensor In Range But Higher Than Expected
Views:
UK: 23
EN: 31
RU: 38
AI status
Completed
Completed
100%
Causes
- MAP sensor internal failure
- Signal wire shorted to 5V (reference) or to another high-voltage source
- Faulty 5V reference or poor sensor ground at the ECM
- Disconnected or damaged MAP vacuum/boost hose (reading atmospheric when vacuum expected)
- Corroded/loose connector or wiring harness damage
- ECM internal fault
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle, rough running or stalling
- Increased fuel consumption or rich/lean running
- Hesitation, poor throttle response or loss of power
- Possible hard start or trouble during load changes
What to check
- Read freeze-frame and live MAP sensor data with scan tool during key-on and while running
- Visually inspect MAP sensor, connector and vacuum/boost hose for damage, disconnection or contamination
- Backprobe MAP sensor connector: measure signal voltage, reference (5 V) and ground with key ON and engine at idle
- Wiggle wiring and connector while monitoring live data to check for intermittent faults
- Compare MAP sensor reading to BARO (ambient) pressure if available — they should be similar with engine off
- Check for related DTCs (e.g., reference or ground circuit faults) and battery/charging system voltage
Signal parameters
- Sensor reference: typically about 5.0 V (check vehicle spec); should be stable with key ON
- Sensor ground: near 0 V with key ON
- Signal voltage at atmospheric pressure (engine off, manifold open to atmosphere): typically ~4.0–4.7 V
- Signal voltage at idle (manifold vacuum): typically ~0.5–2.0 V depending on engine and MAP sensor range
- Signal should vary smoothly with throttle/RPM; spikes or a stuck voltage indicate fault
Diagnostic algorithm
- Retrieve freeze-frame data and note conditions when the fault set (engine load, RPM, temperature).
- Visually inspect MAP sensor, vacuum/boost hose and connector for damage, contamination or disconnection; repair or reconnect as needed.
- With key ON (engine off), backprobe the MAP connector and confirm: stable reference voltage (~5 V), good ground (~0 V) and the signal voltage at expected atmospheric value (~4.0–4.7 V).
- Start engine and observe MAP signal while at idle and during throttle changes. The voltage should drop with manifold vacuum and increase with boost/throttle. If signal stays high or is erratic, proceed.
- If reference or ground is out of range, trace and repair wiring to ECM (check for shorts, corrosion, broken wires).
- If reference and ground are good but signal remains high, disconnect the MAP sensor and check for any voltage present on the signal pin with the sensor removed (should be open/high impedance). Voltage present suggests a wiring/ECM issue.
- If wiring appears good, replace the MAP sensor with a known-good unit and retest.
- After repairs, clear codes, perform test drive under same conditions and verify the code does not return and that live MAP readings are correct.
- If problem persists after sensor and wiring replacement, consider ECM diagnosis or replacement only after confirming wiring and sensor integrity.
Likely causes
- MAP sensor wiring short to battery/ignition feed
- Failed MAP sensor (stuck high or internally shorted)
- Open or high-resistance sensor ground causing abnormal reference reading
- Vacuum hose disconnected so sensor reads atmospheric pressure (appears high during conditions where low voltage expected)
- Intermittent connector contact or corrosion at MAP sensor connector
Fault status
Status
MAP sensor — HIGH INPUT: The MAP sensor signal is above the expected range. Inspect MAP sensor, wiring/connectors, reference voltage and ground; replace sensor or repair harness as required.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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Code
P1103
RAM
P — Powertrain
Turbocharger Waste Gate Actuator Malfunction
Views:
UK: 1
EN: 2
RU: 4
AI status
Completed
Completed
100%
Causes
- MAP sensor internal failure
- Signal wire shorted to 5V (reference) or to another high-voltage source
- Faulty 5V reference or poor sensor ground at the ECM
- Disconnected or damaged MAP vacuum/boost hose (reading atmospheric when vacuum expected)
- Corroded/loose connector or wiring harness damage
- ECM internal fault
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle, rough running or stalling
- Increased fuel consumption or rich/lean running
- Hesitation, poor throttle response or loss of power
- Possible hard start or trouble during load changes
What to check
- Read freeze-frame and live MAP sensor data with scan tool during key-on and while running
- Visually inspect MAP sensor, connector and vacuum/boost hose for damage, disconnection or contamination
- Backprobe MAP sensor connector: measure signal voltage, reference (5 V) and ground with key ON and engine at idle
- Wiggle wiring and connector while monitoring live data to check for intermittent faults
- Compare MAP sensor reading to BARO (ambient) pressure if available — they should be similar with engine off
- Check for related DTCs (e.g., reference or ground circuit faults) and battery/charging system voltage
Signal parameters
- Sensor reference: typically about 5.0 V (check vehicle spec); should be stable with key ON
- Sensor ground: near 0 V with key ON
- Signal voltage at atmospheric pressure (engine off, manifold open to atmosphere): typically ~4.0–4.7 V
- Signal voltage at idle (manifold vacuum): typically ~0.5–2.0 V depending on engine and MAP sensor range
- Signal should vary smoothly with throttle/RPM; spikes or a stuck voltage indicate fault
Diagnostic algorithm
- Retrieve freeze-frame data and note conditions when the fault set (engine load, RPM, temperature).
- Visually inspect MAP sensor, vacuum/boost hose and connector for damage, contamination or disconnection; repair or reconnect as needed.
- With key ON (engine off), backprobe the MAP connector and confirm: stable reference voltage (~5 V), good ground (~0 V) and the signal voltage at expected atmospheric value (~4.0–4.7 V).
- Start engine and observe MAP signal while at idle and during throttle changes. The voltage should drop with manifold vacuum and increase with boost/throttle. If signal stays high or is erratic, proceed.
- If reference or ground is out of range, trace and repair wiring to ECM (check for shorts, corrosion, broken wires).
- If reference and ground are good but signal remains high, disconnect the MAP sensor and check for any voltage present on the signal pin with the sensor removed (should be open/high impedance). Voltage present suggests a wiring/ECM issue.
- If wiring appears good, replace the MAP sensor with a known-good unit and retest.
- After repairs, clear codes, perform test drive under same conditions and verify the code does not return and that live MAP readings are correct.
- If problem persists after sensor and wiring replacement, consider ECM diagnosis or replacement only after confirming wiring and sensor integrity.
Likely causes
- MAP sensor wiring short to battery/ignition feed
- Failed MAP sensor (stuck high or internally shorted)
- Open or high-resistance sensor ground causing abnormal reference reading
- Vacuum hose disconnected so sensor reads atmospheric pressure (appears high during conditions where low voltage expected)
- Intermittent connector contact or corrosion at MAP sensor connector
Fault status
Status
MAP sensor — HIGH INPUT: The MAP sensor signal is above the expected range. Inspect MAP sensor, wiring/connectors, reference voltage and ground; replace sensor or repair harness as required.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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Code
P1103
SUBARU
P — Powertrain
Pressure Sources Switching Solenoid Valve Circuit
Views:
UK: 25
EN: 40
RU: 42
AI status
Completed
Completed
100%
Causes
- MAP sensor internal failure
- Signal wire shorted to 5V (reference) or to another high-voltage source
- Faulty 5V reference or poor sensor ground at the ECM
- Disconnected or damaged MAP vacuum/boost hose (reading atmospheric when vacuum expected)
- Corroded/loose connector or wiring harness damage
- ECM internal fault
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle, rough running or stalling
- Increased fuel consumption or rich/lean running
- Hesitation, poor throttle response or loss of power
- Possible hard start or trouble during load changes
What to check
- Read freeze-frame and live MAP sensor data with scan tool during key-on and while running
- Visually inspect MAP sensor, connector and vacuum/boost hose for damage, disconnection or contamination
- Backprobe MAP sensor connector: measure signal voltage, reference (5 V) and ground with key ON and engine at idle
- Wiggle wiring and connector while monitoring live data to check for intermittent faults
- Compare MAP sensor reading to BARO (ambient) pressure if available — they should be similar with engine off
- Check for related DTCs (e.g., reference or ground circuit faults) and battery/charging system voltage
Signal parameters
- Sensor reference: typically about 5.0 V (check vehicle spec); should be stable with key ON
- Sensor ground: near 0 V with key ON
- Signal voltage at atmospheric pressure (engine off, manifold open to atmosphere): typically ~4.0–4.7 V
- Signal voltage at idle (manifold vacuum): typically ~0.5–2.0 V depending on engine and MAP sensor range
- Signal should vary smoothly with throttle/RPM; spikes or a stuck voltage indicate fault
Diagnostic algorithm
- Retrieve freeze-frame data and note conditions when the fault set (engine load, RPM, temperature).
- Visually inspect MAP sensor, vacuum/boost hose and connector for damage, contamination or disconnection; repair or reconnect as needed.
- With key ON (engine off), backprobe the MAP connector and confirm: stable reference voltage (~5 V), good ground (~0 V) and the signal voltage at expected atmospheric value (~4.0–4.7 V).
- Start engine and observe MAP signal while at idle and during throttle changes. The voltage should drop with manifold vacuum and increase with boost/throttle. If signal stays high or is erratic, proceed.
- If reference or ground is out of range, trace and repair wiring to ECM (check for shorts, corrosion, broken wires).
- If reference and ground are good but signal remains high, disconnect the MAP sensor and check for any voltage present on the signal pin with the sensor removed (should be open/high impedance). Voltage present suggests a wiring/ECM issue.
- If wiring appears good, replace the MAP sensor with a known-good unit and retest.
- After repairs, clear codes, perform test drive under same conditions and verify the code does not return and that live MAP readings are correct.
- If problem persists after sensor and wiring replacement, consider ECM diagnosis or replacement only after confirming wiring and sensor integrity.
Likely causes
- MAP sensor wiring short to battery/ignition feed
- Failed MAP sensor (stuck high or internally shorted)
- Open or high-resistance sensor ground causing abnormal reference reading
- Vacuum hose disconnected so sensor reads atmospheric pressure (appears high during conditions where low voltage expected)
- Intermittent connector contact or corrosion at MAP sensor connector
Fault status
Status
MAP sensor — HIGH INPUT: The MAP sensor signal is above the expected range. Inspect MAP sensor, wiring/connectors, reference voltage and ground; replace sensor or repair harness as required.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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Code
P1103
VOLKSWAGEN
P — Powertrain
Oxygen Sensor Heating Circuit Bank 1 Sensor 1 Short To B+
Views:
UK: 29
EN: 61
RU: 66
AI status
Completed
Completed
100%
Causes
- MAP sensor internal failure
- Signal wire shorted to 5V (reference) or to another high-voltage source
- Faulty 5V reference or poor sensor ground at the ECM
- Disconnected or damaged MAP vacuum/boost hose (reading atmospheric when vacuum expected)
- Corroded/loose connector or wiring harness damage
- ECM internal fault
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle, rough running or stalling
- Increased fuel consumption or rich/lean running
- Hesitation, poor throttle response or loss of power
- Possible hard start or trouble during load changes
What to check
- Read freeze-frame and live MAP sensor data with scan tool during key-on and while running
- Visually inspect MAP sensor, connector and vacuum/boost hose for damage, disconnection or contamination
- Backprobe MAP sensor connector: measure signal voltage, reference (5 V) and ground with key ON and engine at idle
- Wiggle wiring and connector while monitoring live data to check for intermittent faults
- Compare MAP sensor reading to BARO (ambient) pressure if available — they should be similar with engine off
- Check for related DTCs (e.g., reference or ground circuit faults) and battery/charging system voltage
Signal parameters
- Sensor reference: typically about 5.0 V (check vehicle spec); should be stable with key ON
- Sensor ground: near 0 V with key ON
- Signal voltage at atmospheric pressure (engine off, manifold open to atmosphere): typically ~4.0–4.7 V
- Signal voltage at idle (manifold vacuum): typically ~0.5–2.0 V depending on engine and MAP sensor range
- Signal should vary smoothly with throttle/RPM; spikes or a stuck voltage indicate fault
Diagnostic algorithm
- Retrieve freeze-frame data and note conditions when the fault set (engine load, RPM, temperature).
- Visually inspect MAP sensor, vacuum/boost hose and connector for damage, contamination or disconnection; repair or reconnect as needed.
- With key ON (engine off), backprobe the MAP connector and confirm: stable reference voltage (~5 V), good ground (~0 V) and the signal voltage at expected atmospheric value (~4.0–4.7 V).
- Start engine and observe MAP signal while at idle and during throttle changes. The voltage should drop with manifold vacuum and increase with boost/throttle. If signal stays high or is erratic, proceed.
- If reference or ground is out of range, trace and repair wiring to ECM (check for shorts, corrosion, broken wires).
- If reference and ground are good but signal remains high, disconnect the MAP sensor and check for any voltage present on the signal pin with the sensor removed (should be open/high impedance). Voltage present suggests a wiring/ECM issue.
- If wiring appears good, replace the MAP sensor with a known-good unit and retest.
- After repairs, clear codes, perform test drive under same conditions and verify the code does not return and that live MAP readings are correct.
- If problem persists after sensor and wiring replacement, consider ECM diagnosis or replacement only after confirming wiring and sensor integrity.
Likely causes
- MAP sensor wiring short to battery/ignition feed
- Failed MAP sensor (stuck high or internally shorted)
- Open or high-resistance sensor ground causing abnormal reference reading
- Vacuum hose disconnected so sensor reads atmospheric pressure (appears high during conditions where low voltage expected)
- Intermittent connector contact or corrosion at MAP sensor connector
Fault status
Status
MAP sensor — HIGH INPUT: The MAP sensor signal is above the expected range. Inspect MAP sensor, wiring/connectors, reference voltage and ground; replace sensor or repair harness as required.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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