Air Flow Meter/Sensor: Testing and Inspection

MASS AIR FLOW (MAF) SENSOR INSPECTION

NOTE: Perform the following test only when directed.

1. Visually check for the following on the MAF sensor.
- Damage
- Cracks
- Terminal bends
- Terminal rust
- If any of the above are found, replace the MAF sensor.
- If the above are found okay, but PID value is out of specification, perform the "Circuit Open/Short Inspection".

2. Reconnect the MAF sensor connector.






NOTE: The scan tool shows the MAF rate and load value.

Circuit Open/Short inspection




Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- MAF circuit (MAF sensor connector terminal B and PCM connector terminal 4X.)
- Power circuit (MAF sensor connector terminal C and main relay terminal D through common connector.)
- GND circuit (MAF sensor connector terminal A and PCM connector terminal 4A through common connector.)

Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- MAF sensor connector terminal B and PCM connector terminal 4X to GND.
- MAF sensor connector terminal C and main relay terminal D through common connector to GND.