Air Flow Meter/Sensor: Testing and Inspection

MASS AIR FLOW (MAF) SENSOR INSPECTION [L3]

Visual Inspection

NOTE: Perform the following inspection only when directed.

1. Visually inspect for the following on the MAF sensor.
- Damage
- Cracks
- Bent terminals
- Terminal rust
- If any of the above are found, replace the MAF sensor.
- If the MAF PID value is out of specification, carry out the "Circuit Open/Short Inspection".

Circuit Open/Short Inspection

1. Disconnect the PCM connector.
2. Disconnect the MAF sensor connector.




3. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- MAF sensor terminal A and main relay terminal C
- MAF sensor terminal B and PCM terminal 1 P
- MAF sensor terminal C and PCM terminal 1AK

Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.




- MAF sensor terminal A and body GND
- MAF sensor terminal B and power supply
- MAF sensor terminal C and power supply
- MAF sensor terminal C and body GND