Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection
Inspection of ResistanceNOTE: 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 IAT 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 2B.)
- Ground circuit (IAT sensor connector terminal A and PCM connector terminal 3F.)
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- IAT sensor connector terminal B and PCM connector terminal 2B to ground.