Front Ambient Temperature Sensor - Operation

OPERATION

The ambient air temperature sensor is a variable resistor that operates on a 5-volt reference signal sent by the front control module (FCM). The ambient air temperature sensor is connected to the FMC through a two-wire lead and connector of the vehicle wire harness. The ambient air temperature sensor changes its internal resistance in response to changes in the outside air temperature, which either increases or decreases the reference signal voltage read by the FCM. The FCM converts and broadcasts the sensor data over the controller area network (CAN) B bus, where it is read by the ATC A/C-heater control and other vehicle control modules.

The ambient air temperature sensor is diagnosed using a scan tool Testing and Inspection.

The ambient air temperature sensor cannot be adjusted or repaired and must be replaced if inoperative or damaged.