Ambient Temperature Sensor Test
- Turn the ignition switch to the OFF position. Disconnect and isolate the battery negative cable. Disconnect the ambient temperature sensor wire harness connector.
- Measure the resistance of the ambient temperature sensor. At -40°F (-40°C), the sensor resistance is 336 k/ohms. At 140°F (60°C), the sensor resistance is 2.5 k/ohms. The sensor resistance should read between these 2 values. If OK, see AMBIENT TEMPERATURE SENSOR CIRCUIT TEST . If not OK, replace the faulty ambient temperature sensor.