Air Flow Meter/Sensor: Testing and Inspection

MASS AIR FLOW (MAF) SENSOR INSPECTION

NOTE: Perform the following inspection only when directed.

Visual Inspection
1. Visually inspect for the following on the MAF/IAT sensor.
- Damage
- Cracks
- Bent terminals
- Terminal rust
- If any of the above are found, replace the MAF/IAT sensor. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.)




MAF Rate and Load Value

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

Circuit Open/Short Inspection

1. Disconnect the PCM connector (See PCM REMOVAL/INSTALLATION.)




2. Inspect the following harnesses for open or short circuit. (Continuity check).

Open circuit
- MAF/IAT sensor terminal A (harness-side) and main relay terminal C (harness-side)
- MAF/IAT sensor terminal B (harness-side) and PCM terminal 77 (harness-side)
- MAF/IAT sensor terminal C (harness-side) and PCM terminal 88 (harness-side)

Short circuit
- MAF/IAT sensor terminal A (harness-side) and body GND.
- MAF/IAT sensor terminal B (harness-side) and power supply.
- MAF/IAT sensor terminal C (harness-side) and power supply.
- MAF/IAT sensor terminal C (harness-side) and body GND.