Ambient Temperature Sensor: Operation

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

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 powertrain control module (PCM) 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 PCM. The PCM sends the body control module (BCM) and when equipped, the ATC A/C-heater control, a specific signal which corresponds to a specific temperature over the PCI bus.

The ambient temperature sensor is diagnosed using the DRBIII® scan tool. Refer to POWERTRAIN DIAGNOSTIC PROCEDURES - EXCEPT COUPE article.

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