Diagnosis And Testing - Ambient Temperature Sensor: Notes
The ambient temperature display feature is supported by the ambient temperature sensor, a wiring circuit, the Controller Area Network (CAN) data bus and the Totally Integrated Power Module (TIPM). When the sensor is exposed to temperatures above 60° C (130° F) or if the sensor circuit is shorted, 60° C (130° F) will appear in the electronic display in place of the temperature. When the sensor is exposed to temperatures below - 40° C (- 40° F) or if the sensor circuit is open, - 40° C (- 40° F) will appear in the electronic display.
The ambient temperature sensor circuit can be diagnosed using the following Temperature System Test, and Sensor Test. If the temperature sensor and circuit are confirmed to be okay, but the temperature display is inoperative or incorrect, further testing of the Totally Integrated Power Module (TIPM) or the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) may be required using a diagnostic scan tool. Refer to the appropriate diagnostic procedures.