Code
P0100
Generic
P — Powertrain
Mass or Volume Air Flow Sensor A Circuit
Views:
UK: 46
EN: 135
RU: 49
AI status
Completed
Completed
100%
Causes
- Faulty MAF sensor
- Open or shorted wiring in MAF signal, power, or ground circuit
- Corroded or loose connector pins
- Blown sensor reference or ignition-switched fuse
- Contaminated or damaged MAF sensing element
- PCM/ECM internal fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle, hesitation, or stalling
- Reduced engine power or limp-home mode
- Poor fuel economy
- Hard starting or extended crank time
- Increased tailpipe emissions
What to check
- Verify freeze frame and live data with a scan tool; note conditions when code set
- Visual inspection of MAF sensor, intake tubing, clamps, and air filter
- Check connector for corrosion, bent pins, or water/ oil contamination
- Confirm engine ground and battery condition
- Verify applicable fuses and power/ reference voltages at the connector
- Monitor MAF sensor live signal while revving engine and during idle
Signal parameters
- Typical hot-wire/voltage-style MAF: ~0.5–1.5 V at idle, rising toward ~4–5 V at high airflow (varies by vehicle)
- Some MAFs output frequency: frequency increases with airflow (specific Hz ranges are vehicle-dependent)
- Mass airflow reporting (g/s) expected low single digits at idle (e.g., 2–7 g/s) and much higher under load — consult OEM values
- Reference voltage to sensor commonly ~5 V (on many vehicles); also check battery/ignition-switched power and ground continuity
Diagnostic algorithm
- Record freeze-frame, DTCs and live MAF data; note engine load, RPM, and temperature when code set.
- Perform a thorough visual inspection of the MAF, intake tract, and air filter for contamination or damage.
- Check power, reference (often 5 V), and ground at the MAF connector with key ON. Repair blown fuses or open feeds.
- Backprobe the signal wire and observe voltage/frequency on a scope or DVOM while key ON and while revving; compare to expected behavior.
- Wiggle test wiring/connector while monitoring signal to identify intermittent opens/shorts.
- Inspect and test continuity/resistance from MAF connector to PCM connector; check for chafing, shorts to ground, or shorts to power.
- Clean the MAF with approved MAF cleaner if contaminated (do not use other cleaners or touch element). Re-test.
- If electrical supply and wiring are good but signal is out of range, swap or bench-test MAF with a known-good unit if available.
- If a replacement MAF does not correct the issue, continue tracing harness to the PCM and test PCM inputs/grounds; consider PCM fault only after excluding wiring and sensor faults.
- Clear codes and test-drive to confirm repair; monitor for recurrence and re-check freeze-frame if code returns.
Likely causes
- Damaged wiring or poor connector at the MAF sensor
- Contaminated MAF element (oil, dirt) or physical damage
- Failed MAF sensor
- Intermittent connection or poor ground
- Blown fuse or missing reference voltage
Fault status
Status
P0100 — Mass or Volume Air Flow Sensor A Circuit: The ECM detected an improper or missing signal from the primary MAF sensor circuit. Check sensor, wiring, power/reference voltage, and ground.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
P0100
GWM
P — Powertrain
- Airflow Circuit Malfunction
Views:
UK: 10
EN: 43
RU: 23
AI status
Completed
Completed
100%
Causes
- Faulty MAF sensor
- Open or shorted wiring in MAF signal, power, or ground circuit
- Corroded or loose connector pins
- Blown sensor reference or ignition-switched fuse
- Contaminated or damaged MAF sensing element
- PCM/ECM internal fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle, hesitation, or stalling
- Reduced engine power or limp-home mode
- Poor fuel economy
- Hard starting or extended crank time
- Increased tailpipe emissions
What to check
- Verify freeze frame and live data with a scan tool; note conditions when code set
- Visual inspection of MAF sensor, intake tubing, clamps, and air filter
- Check connector for corrosion, bent pins, or water/ oil contamination
- Confirm engine ground and battery condition
- Verify applicable fuses and power/ reference voltages at the connector
- Monitor MAF sensor live signal while revving engine and during idle
Signal parameters
- Typical hot-wire/voltage-style MAF: ~0.5–1.5 V at idle, rising toward ~4–5 V at high airflow (varies by vehicle)
- Some MAFs output frequency: frequency increases with airflow (specific Hz ranges are vehicle-dependent)
- Mass airflow reporting (g/s) expected low single digits at idle (e.g., 2–7 g/s) and much higher under load — consult OEM values
- Reference voltage to sensor commonly ~5 V (on many vehicles); also check battery/ignition-switched power and ground continuity
Diagnostic algorithm
- Record freeze-frame, DTCs and live MAF data; note engine load, RPM, and temperature when code set.
- Perform a thorough visual inspection of the MAF, intake tract, and air filter for contamination or damage.
- Check power, reference (often 5 V), and ground at the MAF connector with key ON. Repair blown fuses or open feeds.
- Backprobe the signal wire and observe voltage/frequency on a scope or DVOM while key ON and while revving; compare to expected behavior.
- Wiggle test wiring/connector while monitoring signal to identify intermittent opens/shorts.
- Inspect and test continuity/resistance from MAF connector to PCM connector; check for chafing, shorts to ground, or shorts to power.
- Clean the MAF with approved MAF cleaner if contaminated (do not use other cleaners or touch element). Re-test.
- If electrical supply and wiring are good but signal is out of range, swap or bench-test MAF with a known-good unit if available.
- If a replacement MAF does not correct the issue, continue tracing harness to the PCM and test PCM inputs/grounds; consider PCM fault only after excluding wiring and sensor faults.
- Clear codes and test-drive to confirm repair; monitor for recurrence and re-check freeze-frame if code returns.
Likely causes
- Damaged wiring or poor connector at the MAF sensor
- Contaminated MAF element (oil, dirt) or physical damage
- Failed MAF sensor
- Intermittent connection or poor ground
- Blown fuse or missing reference voltage
Fault status
Status
P0100 — Mass or Volume Air Flow Sensor A Circuit: The ECM detected an improper or missing signal from the primary MAF sensor circuit. Check sensor, wiring, power/reference voltage, and ground.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
P0100
HUMMER
P — Powertrain
MAF Sensor Circuit Insufficient Activity
Views:
UK: 26
EN: 65
RU: 28
AI status
Completed
Completed
100%
Causes
- Faulty MAF sensor
- Open or shorted wiring in MAF signal, power, or ground circuit
- Corroded or loose connector pins
- Blown sensor reference or ignition-switched fuse
- Contaminated or damaged MAF sensing element
- PCM/ECM internal fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle, hesitation, or stalling
- Reduced engine power or limp-home mode
- Poor fuel economy
- Hard starting or extended crank time
- Increased tailpipe emissions
What to check
- Verify freeze frame and live data with a scan tool; note conditions when code set
- Visual inspection of MAF sensor, intake tubing, clamps, and air filter
- Check connector for corrosion, bent pins, or water/ oil contamination
- Confirm engine ground and battery condition
- Verify applicable fuses and power/ reference voltages at the connector
- Monitor MAF sensor live signal while revving engine and during idle
Signal parameters
- Typical hot-wire/voltage-style MAF: ~0.5–1.5 V at idle, rising toward ~4–5 V at high airflow (varies by vehicle)
- Some MAFs output frequency: frequency increases with airflow (specific Hz ranges are vehicle-dependent)
- Mass airflow reporting (g/s) expected low single digits at idle (e.g., 2–7 g/s) and much higher under load — consult OEM values
- Reference voltage to sensor commonly ~5 V (on many vehicles); also check battery/ignition-switched power and ground continuity
Diagnostic algorithm
- Record freeze-frame, DTCs and live MAF data; note engine load, RPM, and temperature when code set.
- Perform a thorough visual inspection of the MAF, intake tract, and air filter for contamination or damage.
- Check power, reference (often 5 V), and ground at the MAF connector with key ON. Repair blown fuses or open feeds.
- Backprobe the signal wire and observe voltage/frequency on a scope or DVOM while key ON and while revving; compare to expected behavior.
- Wiggle test wiring/connector while monitoring signal to identify intermittent opens/shorts.
- Inspect and test continuity/resistance from MAF connector to PCM connector; check for chafing, shorts to ground, or shorts to power.
- Clean the MAF with approved MAF cleaner if contaminated (do not use other cleaners or touch element). Re-test.
- If electrical supply and wiring are good but signal is out of range, swap or bench-test MAF with a known-good unit if available.
- If a replacement MAF does not correct the issue, continue tracing harness to the PCM and test PCM inputs/grounds; consider PCM fault only after excluding wiring and sensor faults.
- Clear codes and test-drive to confirm repair; monitor for recurrence and re-check freeze-frame if code returns.
Likely causes
- Damaged wiring or poor connector at the MAF sensor
- Contaminated MAF element (oil, dirt) or physical damage
- Failed MAF sensor
- Intermittent connection or poor ground
- Blown fuse or missing reference voltage
Fault status
Status
P0100 — Mass or Volume Air Flow Sensor A Circuit: The ECM detected an improper or missing signal from the primary MAF sensor circuit. Check sensor, wiring, power/reference voltage, and ground.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
P0100
LAND ROVER
P — Powertrain
Air Flow Sensor
Views:
UK: 17
EN: 47
RU: 23
AI status
Completed
Completed
100%
Causes
- Faulty MAF sensor
- Open or shorted wiring in MAF signal, power, or ground circuit
- Corroded or loose connector pins
- Blown sensor reference or ignition-switched fuse
- Contaminated or damaged MAF sensing element
- PCM/ECM internal fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle, hesitation, or stalling
- Reduced engine power or limp-home mode
- Poor fuel economy
- Hard starting or extended crank time
- Increased tailpipe emissions
What to check
- Verify freeze frame and live data with a scan tool; note conditions when code set
- Visual inspection of MAF sensor, intake tubing, clamps, and air filter
- Check connector for corrosion, bent pins, or water/ oil contamination
- Confirm engine ground and battery condition
- Verify applicable fuses and power/ reference voltages at the connector
- Monitor MAF sensor live signal while revving engine and during idle
Signal parameters
- Typical hot-wire/voltage-style MAF: ~0.5–1.5 V at idle, rising toward ~4–5 V at high airflow (varies by vehicle)
- Some MAFs output frequency: frequency increases with airflow (specific Hz ranges are vehicle-dependent)
- Mass airflow reporting (g/s) expected low single digits at idle (e.g., 2–7 g/s) and much higher under load — consult OEM values
- Reference voltage to sensor commonly ~5 V (on many vehicles); also check battery/ignition-switched power and ground continuity
Diagnostic algorithm
- Record freeze-frame, DTCs and live MAF data; note engine load, RPM, and temperature when code set.
- Perform a thorough visual inspection of the MAF, intake tract, and air filter for contamination or damage.
- Check power, reference (often 5 V), and ground at the MAF connector with key ON. Repair blown fuses or open feeds.
- Backprobe the signal wire and observe voltage/frequency on a scope or DVOM while key ON and while revving; compare to expected behavior.
- Wiggle test wiring/connector while monitoring signal to identify intermittent opens/shorts.
- Inspect and test continuity/resistance from MAF connector to PCM connector; check for chafing, shorts to ground, or shorts to power.
- Clean the MAF with approved MAF cleaner if contaminated (do not use other cleaners or touch element). Re-test.
- If electrical supply and wiring are good but signal is out of range, swap or bench-test MAF with a known-good unit if available.
- If a replacement MAF does not correct the issue, continue tracing harness to the PCM and test PCM inputs/grounds; consider PCM fault only after excluding wiring and sensor faults.
- Clear codes and test-drive to confirm repair; monitor for recurrence and re-check freeze-frame if code returns.
Likely causes
- Damaged wiring or poor connector at the MAF sensor
- Contaminated MAF element (oil, dirt) or physical damage
- Failed MAF sensor
- Intermittent connection or poor ground
- Blown fuse or missing reference voltage
Fault status
Status
P0100 — Mass or Volume Air Flow Sensor A Circuit: The ECM detected an improper or missing signal from the primary MAF sensor circuit. Check sensor, wiring, power/reference voltage, and ground.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
P0100
MITSUBISHI
P — Powertrain
AFS
Views:
UK: 19
EN: 67
RU: 26
AI status
Completed
Completed
100%
Causes
- Faulty MAF sensor
- Open or shorted wiring in MAF signal, power, or ground circuit
- Corroded or loose connector pins
- Blown sensor reference or ignition-switched fuse
- Contaminated or damaged MAF sensing element
- PCM/ECM internal fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle, hesitation, or stalling
- Reduced engine power or limp-home mode
- Poor fuel economy
- Hard starting or extended crank time
- Increased tailpipe emissions
What to check
- Verify freeze frame and live data with a scan tool; note conditions when code set
- Visual inspection of MAF sensor, intake tubing, clamps, and air filter
- Check connector for corrosion, bent pins, or water/ oil contamination
- Confirm engine ground and battery condition
- Verify applicable fuses and power/ reference voltages at the connector
- Monitor MAF sensor live signal while revving engine and during idle
Signal parameters
- Typical hot-wire/voltage-style MAF: ~0.5–1.5 V at idle, rising toward ~4–5 V at high airflow (varies by vehicle)
- Some MAFs output frequency: frequency increases with airflow (specific Hz ranges are vehicle-dependent)
- Mass airflow reporting (g/s) expected low single digits at idle (e.g., 2–7 g/s) and much higher under load — consult OEM values
- Reference voltage to sensor commonly ~5 V (on many vehicles); also check battery/ignition-switched power and ground continuity
Diagnostic algorithm
- Record freeze-frame, DTCs and live MAF data; note engine load, RPM, and temperature when code set.
- Perform a thorough visual inspection of the MAF, intake tract, and air filter for contamination or damage.
- Check power, reference (often 5 V), and ground at the MAF connector with key ON. Repair blown fuses or open feeds.
- Backprobe the signal wire and observe voltage/frequency on a scope or DVOM while key ON and while revving; compare to expected behavior.
- Wiggle test wiring/connector while monitoring signal to identify intermittent opens/shorts.
- Inspect and test continuity/resistance from MAF connector to PCM connector; check for chafing, shorts to ground, or shorts to power.
- Clean the MAF with approved MAF cleaner if contaminated (do not use other cleaners or touch element). Re-test.
- If electrical supply and wiring are good but signal is out of range, swap or bench-test MAF with a known-good unit if available.
- If a replacement MAF does not correct the issue, continue tracing harness to the PCM and test PCM inputs/grounds; consider PCM fault only after excluding wiring and sensor faults.
- Clear codes and test-drive to confirm repair; monitor for recurrence and re-check freeze-frame if code returns.
Likely causes
- Damaged wiring or poor connector at the MAF sensor
- Contaminated MAF element (oil, dirt) or physical damage
- Failed MAF sensor
- Intermittent connection or poor ground
- Blown fuse or missing reference voltage
Fault status
Status
P0100 — Mass or Volume Air Flow Sensor A Circuit: The ECM detected an improper or missing signal from the primary MAF sensor circuit. Check sensor, wiring, power/reference voltage, and ground.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
Similar codes
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+100 karma for a short comment :)
Was this AI description helpful?
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0
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0
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