Jeep Workshop Manuals
Grand Cherokee 2WD V6-3.7L (2008)
Sensors and Switches > Sensors and Switches - Instrument Panel > Outside Temperature Display Sensor > Component Information > Description and Operation > Page 1170
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 Front Control Module (FCM). If any portion of the
The ambient temperature sensor circuit can also be diagnosed using the following Sensor Test, and Sensor Circuit Test. If the temperature sensor and
1. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Disconnect the ambient temperature sensor harness
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 OK, refer to Sensor Circuit Test. If not OK, replace the
SENSOR CIRCUIT TEST
Refer to the appropriate wiring information for complete circuit schematic or connector pin-out information.
1. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Disconnect the wire harness connectors from the
ambient temperature sensor and the FCM.
2. Connect a jumper wire between the two terminals in the body half of the ambient temperature sensor harness connector.
There should be continuity. If OK, go to STEP 4. If not OK, repair the open sensor return circuit or ambient temperature sensor signal circuit to
4. Check for continuity between the ambient temperature sensor signal circuit cavity of the FCM harness connector and a good ground. There should
be no continuity. If OK, test the EVIC operation, See: Accessories and Optional Equipment/Driver/Vehicle Information Display/Testing and
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