See Figure 1
The Intake Air Temperature (IAT) sensor determines the air temperature inside the intake manifold. Resistance changes in response to the ambient air temperature. The sensor has a negative temperature coefficient. As the temperature of the sensor rises the resistance across the sensor decreases. This provides a signal to the PCM indicating the temperature of the incoming air charge. This sensor helps the PCM to determine spark timing and air/fuel ratio. Information from this sensor is added to the pressure sensor information to calculate the air mass being sent to the cylinders. The IAT is a two wire sensor, a 5-volt reference signal is sent to the sensor and the signal return is based upon the change in the measured resistance due to temperature.
See Figures 2 and 3
- 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.
- Detach the IAT sensor 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.