The Intake Air Temperature (IAT) sensor is a thermistor that changes the resistance in response to the intake air temperature. The IAT senses the intake air temperature and sends that information to the Powertrain Control Module (PCM). The PCM uses this information to calculate the correct amount of fuel injection.
The IAT sensor is mounted in the following locations:
See Figures 1 and 2
- Disengage the Intake Air Temperature (IAT) sensor electrical connection.
- Connect jumper wires from the sensor connector to the wiring harness. This permits the engine to operate normally while you check the sensor.
- Connect a Digital Volt Ohmmeter (DVOM) between the sensor terminals.
- Measure the voltage or ohms with the engine off and cool, as well as with the engine running and warmed up. Compare the temperature versus voltage or resistance values obtained with those in the chart.
- Replace the sensor if the readings are incorrect.
- If the reading for a given temperature is about that shown in the table, the IAT sensor is okay.
REMOVAL & INSTALLATION
The Intake Air Temperature (IAT) sensor used on 1.8L engines is an integral part of the Vane Air Flow (VAF) meter, and is not serviced separately.1.9L and 2.0L Engines
See Figure 3
- Disconnect the negative battery cable.
- If necessary for access on some 2.0L engines, remove the air cleaner outlet tube.
- Unplug the sensor electrical connection.
- Using a suitable tool, remove the sensor.
- Install the sensor and attach its electrical connection.
- If removed, install the air cleaner outlet tube.
- Connect the negative battery cable.