The coolant temperature information is conveyed to the instrument panel, through the PCM, from the Engine Coolant Temperature (ECT) sensor. To test and remove the sensor, refer to Driveability & Emissions Controls . To test the gauge, perform the following testing procedure.
- With the ignition switch in the OFF position, initiate the instrument cluster self-diagnostics by pressing the TRIP and RESET buttons.
- While holding the TRIP and RESET buttons, turn the ignition key to the ON position.
- Continue to hold the TRIP and RESET buttons until the word CODE appears in the odometer windows (approximately 5 seconds) then release the buttons.
- If a problem exists, the system will display Diagnostic Trouble Codes (DTC's). If no problems exist, the code 999 (End of Codes) will momentarily appear.
- If the needle of the gauge does not move, replace the main cluster circuit board. If the needle of the gauge moves erratically, replace the cluster dial assembly. If the temperature gauge is reading inaccurately, use a DRB®, or equivalent scan tool to check the gauge calibration and adjust it if necessary.
- If fault code 110 is displayed, replace the main cluster circuit board, check the gauge calibration using a DRB®, or equivalent scan tool, then repeat the self diagnostic procedure. If the test is okay, then stop, however, if it is not okay, replace the dial assembly.
- If fault code 111 is displayed, check the gauge calibration and adjust, if necessary. Install the cluster assembly and retest. If the test is okay, then stop, however, if it is not okay, replace the main cluster circuit board. Check the gauge calibration and retest. If not okay, replace the dial assembly.
Instrument Cluster Diagnostic Trouble Code (DTC) Table