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

INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION

Inspection of Resistance

NOTE: Perform the following test only when directed.

1. Disconnect the IAT sensor connector.
2. Remove the IAT sensor.




3. Place the IAT sensor in water with a thermometer, and heat the water gradually.







4. Measure the resistance of the AT sensor using an ohmmeter.
- If IAT sensor is okay, but PID value is out of specification, perform the "Circuit Open/Short inspection".
- If not as specified, replace the IAT sensor.

5. Reconnect the IAT sensor connector.

Circuit Open/Short Inspection




Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- Reference voltage circuit (IAT sensor connector terminal B and PCM connector terminal 4N.)
- GND circuit (IAT sensor connector terminal A and PCM connector terminal 4O.)

Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- IAT sensor connector terminal B and PCM connector terminal 4N to GND.