For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Check the vehicle for Diagnostic Trouble Codes (DTCs). Are any DTCs present? | -- | Go to Diagnostic Trouble Code (DTC) List | Go to Step 2
2 |

1. Turn the ignition switch to the RUN position. Coolant warning indicator should be on.
2. Start the engine, and idle. Coolant warning indicator should go off.

Does the cooling warning indicator operate properly?

--

System OK

Go to DTC P1673 Engine Coolant Temperature Lamp Control Circuit