Schematic Reference: Instrument Cluster Schematics .

DEFINITION: This diagnostic procedure applies only to the serial data gages located in the instrument cluster which include the speedometer, the tachometer and the engine coolant temperature gage, if equipped.

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Turn the ignition ON, with the engine OFF.
2. Install a scan tool.
3. With the scan tool, perform the Display(s) Test.

Does the gage move from 0 to its maximum value and back to 0 when you perform the Display(s) Test?

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Go to Step 3

Go to Step 4

1. Install a scan tool.

Important: If the suspect gage is the speedometer, the drive wheels of the vehicle must be raised and the transmission must be placed in drive or first gear. Refer to Lifting and Jacking the Vehicle .

2. Start the engine.
3. Observe the suspect gage parameter in the engine control module (ECM) Data list. Refer to Scan Tool Data List .

Does the parameter match the gage display?

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Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 4

Replace the instrument panel cluster (IPC). Refer to Control Module References for replacement, setup and programming.

Did you complete the replacement?

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Go to Step 5

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1. Use the scan tool in order to clear any induced DTCs.
2. Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2