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 mounted near the air cleaner case. It measures air mass flow rate of the intake air into the combustion engine. The powertrain control module (PCM) determines the necessary fuel mass that must be mixed with the measured MAF sensor value to obtain required air-fuel mixture. The PCM monitors the MAF sensor for electrical malfunctions. The MAF sensor output voltage increases (non-linear) as the mass airflow increases. Depending on engine operating point, the output voltage is continuously monitored and compared with minimum and maximum thresholds. If the MAF sensor output voltage is a specified value for a specified time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
0.5 second or more
DTC Type
One drive cycle, MIL on

Enable Conditions
Condition
Minimum
Maximum
12 volt battery voltage [Battery]
10.5 V
–
State of the engine
Running
Other
Above enable conditions are met for at least 0.1 second
[ ]: HDS Parameter

Malfunction Threshold
DTC: P0102

The MAF sensor output voltage [MAF Sensor] is less than 0.11 V for at least 0.5 second.

DTC: P0103

The MAF sensor output voltage [MAF Sensor] is greater than 4.95 V or more for at least 0.5 second.

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 AFM line open
MAF sensor VCC line open
MAF sensor power supply line open

DTC: P0103
MAF sensor SG line open
MAF sensor VCC line short to ground
MAF sensor power supply line short to ground

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.