OPERATION
The Intake Air Temperature (IAT) sensor resistance changes in response to the intake air temperature. The sensor resistance decreases as the surrounding air temperature increases. This provides a signal to the PCM indicating the temperature of the incoming air charge.
Most engines mount the IAT sensor in the air cleaner-to-throttle body supply tube. However, some earlier engines have it mounted to the upper intake manifold.
TESTINGSee Figure 1
Turn the ignition switch OFF .
- Disengage the wiring harness connector from the IAT sensor.
- Using a Digital Volt-Ohmmeter (DVOM), measure the resistance between the two sensor terminals.
- Compare the resistance reading with the accompanying chart. If the reading for a given temperature is approximately that shown in the table, the IAT sensor is okay.
- Attach the wiring harness connector to the sensor.
Fig. Fig. 1: IAT sensor wiring harness connections
See Figures 2 and 3
- Disconnect the negative battery cable.
Fig. Fig. 2: To remove the IAT sensor, disconnect the wire harness plug ...
- Disengage the wiring harness connector from the IAT sensor.
- Remove the sensor from the air cleaner outlet tube.
Fig. Fig. 3: ... then loosen and remove the sensor from its mounting boss
- Wipe down the air cleaner outlet tube and IAT sensor mounting boss to clean the sensor area of all dirt and grime.
- Install the sensor into the air cleaner outlet tube securely.
- Attach the wiring harness connector to the IAT sensor.
- Connect the negative battery cable.
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