Air Flow Meter/Sensor: Testing and Inspection

MASS AIR FLOW (MAP) SENSOR INSPECTION [L3 WITH TC]

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 harness for an open or short circuit. (Continuity check)

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 11
- MAF sensor terminal C and PCM terminal 1 P

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




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