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Ambient Temperature Sensor Circuit

WARNING: This page is about a different car, the 2005 Dodge Grand Caravan, 2005 Dodge Caravan, and 2005 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Disconnect the ambient temperature sensor wire harness connector and the Powertrain Control Module (PCM) wire harness connector.
  2. Connect a jumper wire between the two terminals in the body half of the ambient temperature sensor wire harness connector.
  3. Check for continuity between the sensor return circuit and the ambient temperature sensor signal circuit cavities of the PCM wire 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 the ambient temperature sensor as required.
  4. Remove the jumper wire from the body half of the ambient temperature sensor wire harness connector. Check for continuity between the sensor return circuit cavity of the PCM wire harness connector and a good ground. There should be no continuity. If OK, go to step  5. If not OK, repair the shorted sensor return circuit as required.
  5. Check for continuity between the ambient temperature sensor signal circuit cavity of the PCM wire harness connector and a good ground. There should be no continuity. If OK, (Refer to ELECTRICAL/OVERHEAD CONSOLE - DIAGNOSIS AND TESTING)  to determine the cause. If not OK, repair the shorted ambient temperature sensor signal circuit as required.
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