Inspection Procedure 5: Engine Coolant Temperature Gauge does not Work (other meters work). <3000, 3200 and 3800>

COMMENTS ON TROUBLE SYMPTOM

If only the engine coolant temperature gauge does not operate, the engine-ECU <M/T> or engine-A/T-ECU <A/T> system, the combination meter, the wiring harness or its connector may be defective.

PROBABLE CAUSES

Damaged harness wires and connectors
Malfunction of engine-ECU <M/T> or engine-A/T-ECU <A/T>
Malfunction of combination meter

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result satisfactory?

	Go to Step 2.

	Repair the CAN bus lines (Refer to GROUP 54D - Troubleshooting ). After diagnosing the CAN bus lines, go to Step 5.

STEP 2. M.U.T.-III other system diagnosis code

Check whether the MPI system or Diesel system-related diagnosis code is set.

Q. Is the diagnosis code set?

	Diagnose the MPI system or Diesel system (Refer to GROUP 13A, Troubleshooting <3000>, GROUP 13B, Troubleshooting <3800> or GROUP 13D, Troubleshooting <3200>). After diagnosing the MPI system or Diesel system, go to Step 5.

	Go to Step 3.

STEP 3. M.U.T.-III data list

Item No.8: Water temperature gauge (Refer to ).

Q. Is the check result satisfactory?

	Go to Step 4.

	Diagnose the MPI system or Diesel system (Refer to GROUP 13A, Troubleshooting <3000>, GROUP 13B, Troubleshooting <3800> or GROUP 13D, Troubleshooting <3200>). After diagnosing the MPI system or Diesel system, go to Step 5.

STEP 4. M.U.T.-III actuator test

Item No.4: Water temperature gauge

OK: The water thermometer operates.

Q. Is the check result satisfactory?

	Go to Step 5.

	Replace combination meter and then go to step 5.

STEP 5. Retest the system.

Check to see that the engine coolant temperature gauge operates normally.

Q. Is the check result satisfactory?

	The procedure is complete.

	Go to Step 1.