Journey FWD V6-3.5L (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 5-volt reference signal sent by the Totally Integrated Power Module (TIPM).
The ambient air temperature sensor is connected to the TIPM 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 TIPM. The TIPM converts and broadcasts the sensor data over the Controller Area Network (CAN) IHS bus, where it is read
by the ATC A/C-heater control, Powertrain Control Module (PCM) and other 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.
