Ambient Temperature Sensor Fault Codes: Notes

The outside temperature function is supported by the ambient temperature sensor (ATS), a signal and ground circuit hardwired to the PCM (gas) FCM (diesel), and the CMTC/EVIC display.

If the ATS sense circuit is shorted to ground, the temp display will be 54°C (130°F) to indicate a SHORT circuit condition.

If the ATS sense circuit is open, the temp display will be -40°C (-40°F) to indicate an OPEN circuit condition.

If there is an OPEN or SHORT circuit condition, it must be repaired before the CMTC/EVIC VFD can be tested.

The ATS is supported by the PCM (gas) FCM (diesel). Ambient Temperature Sensor DTCs will be recorded in the PCM (gas) FCM (diesel). The ATS can be diagnosed using the following Sensor Test. Test the ATS circuits using the diagnostics in the Body Diagnostic Procedures Information. If the CMTC/EVIC passes the self-test, and the ATS, the circuits, and PCI bus communications are confirmed to be OK, but the CMTC/EVIC temperature display is inoperative or incorrect, replace the PCM (gas) FCM (diesel).