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

INTAKE AIR TEMPERATURE (EAT) SENSOR INSPECTING[AJ]

NOTE: Perform the following inspection only when directed.

Resistance Inspection
1. Disconnect the negative battery cable.
2. Disconnect the MAF/IAT sensor connector.

Specification:

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