Pinpoint Test AS: The Outside Air Temperature Display Is Inoperative/Incorrect
Instrumentation, Message Center and Warning Chimes
Pinpoint Test AS: The Outside Air Temperature Display Is Inoperative/Incorrect
Normal Operation
The ambient air temperature sensor is hardwired to the PCM through separate input and return circuits. The PCM provides a reference voltage to the ambient air temperature sensor and monitors the change in voltage resulting from changes in resistance as determined by outside air temperature. The PCM messages the raw ambient air temperature data to the HVAC module through the Body Control Module (BCM). The HVAC module then filters the data and sends the modified ambient temperature data to the Instrument Panel Cluster (IPC) through the BCM (Body Control Module) in degrees Celsius (metric). When the Fahrenheit (English) display is selected by the driver, the IPC (Instrument Panel Cluster) converts the Celsius to Fahrenheit and displays the temperature in the message center. The outside air temperature value can be reset by using a HVAC (Heating Ventilation Air Conditioning) multiple button press procedure. The reset procedure enables the raw data from the ambient air temperature sensor to be displayed in the message center bypassing the interpretation process carried out by the HVAC (Heating Ventilation Air Conditioning) module. After the outside air temperature reset has been carried out, the system begins updating through the normal interpretation and update procedure.
This pinpoint test is intended to diagnose the following:
- Communication concern
- PCM concern
PINPOINT TEST AS : THE OUTSIDE AIR TEMPERATURE DISPLAY IS INOPERATIVE/INCORRECT
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
AS1 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST
- Check for recorded IPC (Instrument Panel Cluster) DTCs from the self-test.
Are any DTCs recorded?
Yes
For DTC U0140:00, GO to Pinpoint Test BF. Pinpoint Test BF: DTC U0140:00
For DTC U0424:82, GO to Pinpoint Test BJ. Pinpoint Test BJ: DTC U0424:82
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to AS2.
AS2 RETRIEVE THE RECORDED DTCs FROM THE HVAC MODULE SELF-TEST
- Check for recorded HVAC module DTCs from the self-test.
Are any DTCs recorded?
Yes
REFER to Heating and Air Conditioning.
No
GO to AS3.
AS3 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO (Key ON Engine OFF) SELF-TEST
- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
Are any ambient temperature sensor DTCs recorded?
Yes
REFER to Computers and Control Systems Information.
No
GO to AS4.
AS4 RESET THE OUTSIDE AIR TEMPERATURE DISPLAY
- Reset the outside air temperature display by using the following HVAC (Heating Ventilation Air Conditioning) multiple button press procedure:
- Press the A/C and RECIRC buttons at the same time and release, followed by a single press of the A/C button within 2 seconds.
Is the concern still present?
Yes
INSTALL a new ambient temperature sensor. TEST the system for normal operation.
No
The system is operating correctly at this time. Resetting the outside air temperature display has corrected the concern.