Grand Cherokee 2WD Limited V8-4.7L (2002)
Ambient Temperature Sensor / Switch HVAC: Testing and Inspection
Ambient Temperature Sensor Test
1. Turn the ignition OFF.
2. Disconnect the ATS harness connector.
3. Measure the resistance of the ATS using the following min/max values:
AMBIENT TEMPERATURE ............................................................................................................................................. SENSOR RESISTANCE
0 °C (32 °F) ............................................................................................................................................................................. 29.33 - 35.99 Kilohms
10 °C (50 °F) ........................................................................................................................................................................... 17.99 - 21.81 Kilohms
20 °C (68 °F) ........................................................................................................................................................................... 11.37 - 13.61 Kilohms
25 °C (77 °F) ............................................................................................................................................................................. 9.12 - 10.86 Kilohms
30 °C (86 °F) ............................................................................................................................................................................... 7.37 - 8.75 Kilohms
40 °C (104 °F) ............................................................................................................................................................................. 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.
