- Turn the ignition switch to the OFF position.
- Detach the coolant temperature sensor electrical connector.
- Using a DVOM set to the ohms scale, connect one lead to terminal A and the other lead to terminal B of the coolant temperature sensor connector.
- With the engine at normal operating temperature, approximately 200F (93C), the ohmmeter should read approximately 700-1000 ohms.
- With the engine at room temperature, approximately 70F (21C), the ohmmeter should read approximately 7000-13,000 ohms.
If not within specifications, replace the engine coolant temperature sensor.
NOTETest the resistance of the wiring harness between PCM terminal 26 and the sensor wiring harness connector. Also check for continuity between PCM connector terminal 43 and the sensor wiring harness connector. If the resistance measures greater than 1 ohm, repair the wiring harness as necessary.
- 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.
The coolant temperature information is conveyed to the instrument panel, through the PCM, from the Engine Coolant Temperature (ECT) sensor. To test the gauge, perform the following testing procedure.