GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

When the vehicle is running or the ignition is in the ON position.

Gauges operate normally.

Intermittents and Poor Connections Diagnosis

2

When the vehicle is running.

The tachometer should read the correct engine speed.

    •  Tachometer Inaccurate
    •  Tachometer Inoperative

3

When ignition is in the ON position.

Fuel gauge registers correct amount of fuel in gas tank.

4

When ignition is in the ON position.

Engine coolant temperature gauge registers correct temperature of coolant in the engine.

5

When the vehicle is moving forward.

The speedometer accurately displaying the vehicle's speed and odometer reading.

6

Operation of the trip select reset.

Odometer, trip A, and trip B settings can be accessed and the trip settings can be reset.

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