Ambient Temperature Sensor Test

1. Turn the ignition OFF.
2. Disconnect and isolate the battery negative cable.
3. Disconnect the ambient temperature sensor harness connector.
4. Measure the resistance of the ambient temperature sensor using the following values:
   • 0°C (32°F) Sensor Resistance = 29.33 - 35.99 Kilo ohms
   • 10°C (50°F) Sensor Resistance = 17.99 - 21.81 Kilo ohms
   • 20°C (68°F) Sensor Resistance = 11.37 - 13.61 Kilo ohms
   • 25°C (77°F) Sensor Resistance = 9.12 - 10.86 Kilo ohms
   • 30°C (86°F) Sensor Resistance = 7.37 - 8.75 Kilo ohms
   • 40°C (104°F) Sensor Resistance = 4.90 - 5.75 Kilo ohms

The sensor resistance should read between these min/max values. If the resistance value is OK, refer to the SYSTEM WIRING DIAGRAMS to test the Signal and Ground circuits. If the resistance values are not OK, replace the Sensor.