DTC P0102-00; MAF Sensor Circuit Low Input: Notes
DETECTION CONDITION AND POSSIBLE CAUSE
| DTC P0102:00 |
MAF sensor circuit low input |
| DETECTION CONDITION |
- The PCM monitors input voltage from the MAF sensor. If the input voltage at the PCM terminal 2BC is below 0.2 V for 5 s, the PCM determines that the MAF sensor circuit has a malfunction.
Diagnostic support note
- This is a continuous monitor (CCM).
- The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.
- FREEZE FRAME DATA/Snapshot data is available.
- DTC is stored in the PCM memory.
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| FAIL-SAFE FUNCTION |
- Restricts the upper limit of the engine speed.
- Inhibits the evaporative purge control.
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| POSSIBLE CAUSE |
- MAF sensor/IAT sensor No. 1 connector or terminals malfunction
- Short to ground or open circuit in MAF sensor power supply circuit
- Short to ground in wiring harness between ENGINE1 15 A fuse and MAF sensor/IAT sensor No. 1 terminal E
- ENGINE1 15 A fuse malfunction
- Open circuit in wiring harness between main relay terminal C and MAF sensor/IAT sensor No. 1 terminal E
- Short to ground in wiring harness between the following terminals:
- MAF sensor/IAT sensor No. 1 terminal D-PCM terminal 2AG
- MAF sensor/IAT sensor No. 1 terminal C-PCM terminal 2BC
- PCM connector or terminals malfunction
- MAF sensor signal circuit and ground circuit are shorted to each other
- Open circuit in wiring harness between the following terminals:
- MAF sensor/IAT sensor No. 1 terminal D-PCM terminal 2AG
- MAF sensor/IAT sensor No. 1 terminal C-PCM terminal 2BC
- MAF sensor malfunction
- PCM malfunction
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CAUTION:
- Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.
Related PIDs
| Item (definition) |
Unit/Condition |
Definition |
Condition/Specification (Reference) |
| MAF |
g/Sec |
Mass air flow input from MAF sensor |
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| V |
MAF sensor voltage |
- Ignition switched ON (engine off) (MAF: 0.59 g/s {0.078 lb/min}): Approx. 0.72 V
- Idle (after warm up) (MAF: 2.17 g/s {0.287 lb/min}): Approx. 0.97 V
- Racing (engine speed is 2, 000 rpm) (MAF: 4.73 g/s {0.626 lb/min}): Approx. 1.26 V
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