Durango 2WD V8-5.7L Hybrid (2009)
Ambient Temperature Sensor / Switch HVAC: Description and Operation
Front Ambient Temperature Sensor - Operation
OPERATION
The ambient air temperature sensor is a variable resistor that operates on a ground circuit and a 5-volt reference signal circuit sent by the front control
module (FCM) 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 A/C-heater control and other various vehicle control
modules.
The ambient air temperature sensor is diagnosed using a scan tool See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Diagnostic Trouble Code Tests and Associated Procedures.
The ambient air temperature sensor cannot be adjusted or repaired and must be replaced if inoperative or damaged See: Instrument Panel, Gauges and
Warning Indicators/Outside Temperature Display/Outside Temperature Display Sensor/Service and Repair/Ambient Temperature Sensor - Removal.
