Outside Temperature Display Sensor: Testing and Inspection

AMBIENT TEMPERATURE SENSOR

The temperature function is supported by the ambient temperature sensor, a wiring circuit, and the Totally Integrated Power Module (TIPM). When the sensor is exposed to temperatures above 60° C (140° F), or if the sensor circuit is shorted, 60° C (130/140° F) will appear in the display in place of the temperature. When the sensor is exposed to temperatures below - 40° C (- 40° F) or if the sensor circuit is open, - - ° C (- - ° F) will be displayed on Electronic Vehicle Information Center (EVIC) equipped vehicles.

The ambient temperature sensor circuit can be diagnosed using the following Temperature Sensor Test. If the temperature sensor and circuit are confirmed to be OK, but the temperature display is inoperative or incorrect, Testing and Inspection as applicable for further diagnostic information.

SENSOR TEST

1. Turn the ignition switch to the Off position. Disconnect the ambient temperature sensor harness connector.
2. Measure the resistance of the ambient temperature sensor. At - 40° C (- 40° F), the sensor resistance is 336 kilohms. At 55° C (130° F), the sensor resistance is 2.488 kilohms. The sensor resistance should read between these two values. If not OK, replace the inoperative ambient temperature sensor. If OK, perform further diagnosis of the Ambient Temperature System, Testing and Inspection as applicable.