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

Fig. 28 Intake Air Temperature Sensor:

1. With the key off, disconnect wire harness connector from the intake air temperature sensor (Fig. 28).
2. Connect a high input impedance (digital) volt-ohmmeter to the sensor terminals. The ohmmeter should read as follows:
- Engine/Sensor at normal operating temperature around 200°F should read approximately 700 to 1,000 ohms.
- Engine/Sensor at room temperature around 70°F ohmmeter should read approximately 7,000 to 13,000 ohms.
3. Test the resistance of the wire harness between the PCM 60-way connector terminal 6 and the sensor harness connector. Also check for continuity between PCM 60-way connector terminal 51 and the sensor harness connector. Refer to electrical diagrams for circuit information. If the resistance is greater than 1 ohm, repair the wire harness as necessary.

NOTE: Testing for this system or component is done at the system level. DTC Test - CODE TO TC TEST CHART (Checking for Trouble Codes)