DTC Advanced Diagnostics: P0102, P0103
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] is 0.10 V or less for at least 2.0 seconds.

DTC: P0103

The MAF sensor output voltage [MAF SENSOR] is 4.89 V or more for at least 2.0 seconds.

[ ]: HDS Parameter

Possible Cause
NOTE: 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, and the freeze data 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, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.