The Intake Air Temperature (IAT) Sensor is used by the ECM/PCM to monitor the air temperature inside the intake manifold. The resistance decreases as the air temperature increases. This provides a signal to the ECM/PCM indicating the temperature of the incoming air charge. This sensor helps the ECM/PCM to determine spark timing and the air-to-fuel ratio. Information from this sensor is added to the pressure sensor information to calculate the density of the air mass being sent to the cylinders.
- Turn the ignition switch OFF .
- Disconnect the wiring harness from the IAT sensor.
- Measure the resistance between the sensor terminals.
- Compare the resistance reading with the accompanying chart.
- If the resistance is not within specification, the IAT may be faulty.
- Connect the wiring harness to the sensor.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Disconnect the IAT sensors electrical connector.
- Remove the retaining screws from the sensor (some models may unscrew from the manifold).
- Remove the IAT sensor from the intake manifold.
- Coat the sensor threads with Teflon® sealant.
- Install the sensor into the intake manifold.
- Attach the connectors on the IAT.
- Connect the negative battery cable.