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

Resistance Inspection

NOTE: Perform the following test only when directed.

1. Remove the IAT sensor.
2. Measure the resistance of the IAT sensor terminals A and B using an ohmmeter.




Specification

- If not as specified, replace the IAT sensor.

- If IAT sensor is okay, but PID value or PCM terminal 39 voltage are out of specification, inspect as follows.
1. Disconnect the PCM connector.




2. Connect the SST (104 Pin Breakout Box) to the PCM as shown.
3. Tighten the connector attaching screw.

Tightening torque
7.9 - 10.7 Nm (80 - 110 kg.cm, 69.5 - 95.4 in.lb)

4. Inspect for an open or short circuit in the following wiring harnesses by probing the applicable sensor and SST (104 Pin Breakout Box) terminals with ohmmeter leads.
- If there is an open or short circuit, repair or replace wiring harnesses.
- If there is no open or short circuit, replace the IAT sensor.




Open circuit
- IAT signal circuit (IAT sensor connector terminal A and PCM connector terminal 39)
- Ground circuit (IAT sensor connector terminal B and PCM connector terminal 91 through common connector)

Short circuit
- IAT signal circuit (IAT sensor connector terminal A and PCM connector terminal 39 to Ground)

3. Install the IAT sensor.