GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

Turn the ignition switch to ON.

The oil pressure indicator lights.

ENGINE OIL PRESSURE Message Inoperative

2

Start the engine.

The oil pressure indicator goes off.

ENGINE OIL PRESSURE Message Always On

3

Inspect the operation of the fuel gauge.

The fuel gauge indicates the correct fuel level.

4

  1. Run the engine until the engine reaches the normal operating temperature
  2. Inspect the Engine Coolant Temperature (ECT) gauge.

The ECT gauge indicates the correct engine coolant temperature.

5

With the engine running, inspect the operation of the tachometer.

The tachometer indicates the correct engine RPM.

Tachometer Inoperative

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.