Ambient Temperature Sensor Test

Turn the ignition OFF.
Disconnect and isolate the battery negative cable (Fig. 3).
Disconnect the ATS harness connector.
Measure the resistance of the ATS using the following min/max values:
- 0° C (32° F)
  Sensor Resistance = 29.33 - 35.99 Kilohms.
- 10° C (50° F)
  Sensor Resistance = 17.99 - 21.81 Kilohms.
- 20° C (68° F)
  Sensor Resistance = 11.37 - 13.61 Kilohms.
- 25° C (77° F)
  Sensor Resistance = 9.12 - 10.86 Kilohms.
- 30° C (86° F)
  Sensor Resistance = 7.37 - 8.75 Kilohms.
- 40° C (104° F)
  Sensor Resistance = 4.90 - 5.75 Kilohms.
  
  The sensor resistance should read between these min/max values. If the resistance values are not OK, replace the Sensor.