Coolant Temperature Indicator/Warning Light Troubleshooting

Before testing, check the No. 8 (15A) fuse in the under-hood fuse/relay box and No. 3 (7.5A) fuse in the under-dash fuse/relay box.

1.Start the engine and check the Malfunction Indicator Lamp (MIL).

Does the MIL come on?


YES - Troubleshoot the DTC, and recheck.


NO - Go to 2.


2.Disconnect the ECM connector E (40P) or ECM/PCM connector E (31P).

3.Check for continuity between each terminal of the ECM/PCM connector E and gauge assembly connector C (40P) No. 16 terminal.

With throttle actuator control 

Without throttle actuator control 

Is there continuity?


YES - Replace the gauge assembly and recheck.n


NO - Check the open in the wire and the connection condition of the terminal.n