DTC Advanced Diagnostics: P0102, P0103 (3.5L Engine)
DTC P0102: Mass Airflow (MAF) Sensor Circuit Low Voltage DTC P0103: Mass Airflow (MAF) Sensor Circuit High Voltage
General Description
The mass airflow (MAF) sensor is attached to the intake air passage, and it measures the amount of intake airflow. The MAF sensor is a hot wire airflow meter. The airflow cools the electrically heated wire that is mounted in the air passage. The powertrain control module (PCM) determines the amount of intake airflow by detecting the current that is required to keep the hot wire at a constant temperature. The lower or the upper limit of the MAF sensor output is specified. If the output is below or above that limit, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 2.0 seconds or more |
| DTC Type | One drive cycle, MIL on |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
DTC: P0102
The MAF sensor output voltage [MAF Sensor Voltage] is 0.10 V or less for at least 2.0 seconds.
DTC: P0103
The MAF sensor output voltage [MAF Sensor Voltage] is 4.89 V or more for at least 2.0 seconds.
[ ]: HDS Parameter
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
DTC: P0102
- MAF sensor VGP line short to ground
- MAF sensor VGP line open
- MAF sensor power supply line open
DTC: P0103
- MAF sensor VGM line open
Common
- MAF sensor failure
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, the freeze data, and the on-board snapshot are stored in the PCM memory.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.