Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection

INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [AJ]

NOTE: Perform the following inspection only when directed.

Resistance Inspection

1. Disconnect the negative battery cable,
2. Disconnect the MAF/IAT sensor connector.
3. Measure the resistance between the MAF/IAT sensor terminals D and E using an ohmmeter.




- If the IAT sensor is okay, but the PID value is out of specification, perform the "Circuit Open/ Short Inspection".
- If not as specified, replace the MAF/IAT sensor.

Circuit Open/Short Inspection

1. Disconnect the PCM connector.




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

Open circuit
- MAF/IAT sensor terminal D and PCM terminal 1AT
- MAF/IAT sensor terminal E and PCM terminal 1BH

Short circuit
- MAF/IAT sensor terminal D and power supply
- MAF/IAT sensor terminal D and body ground
- MAF/IAT sensor terminal E and power supply