DTC P0102: MAF Sensor Circuit Low Voltage
- Check the ''On Board Diagnostic (OBD) System Check''.
Was the ''OBD System Check'' performed?
YES – Go to step 2.
NO – Go to OBD System Check. 
- Check the DTC.
Are there other DTCs P1625, P1618 or P0113 (beside DTC P0102) being output?
YES – Go to DTC P1625, P1618, or P0113 chart (5 V reference #1 circuit or ground circuit failure).
NO – Go to step 3.
- Start the engine and allow it to idle.
- Check the MAF with the scan tool.
Is about 8 – 13 g/sec indicated? (Sea level of 0 m at room temperature: about 20 °C.)
YES – Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the MAF sensor and at the ECM.
NO – Go to step 5.
- Turn the ignition switch OFF.
- Disconnect the MAF sensor 5P connector.
- Disconnect ECM connector.
- Check the MAF sensor signal and +5 V circuits for an open or short to ground.
Wire side of female terminals
MAF/IAT sensor 5P connector
JUMPER WIRE
Is a problem found?
YES – Repair the MAF signal or +5 V circuit.
NO – Go to step 9.
- Check the MAF sensor B+ circuit for an open or short to ground.
Wire side of female terminals
MAF/IAT sensor 5P
Is a problem found?
YES – Repair the MAF +B circuit.
NO – Go to step 10.
- Connect the ECM connector.
- Connect the MAF sensor 5P connector terminals No. 4 and No. 5 with a jumper wire.
Wire side of female terminals
MAF/IAT sensor 5P connector
JUMPER WIRE
- Turn the ignition switch ON (II).