GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Instrument Cluster Schematics

1

Did you perform the IPC Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

  1. Disconnect engine control module (ECM) connector C2.
  2. Turn ON the ignition, with the engine OFF.
  3. Connect a 3 amp fused jumper between the fuel cap missing control circuit at the ECM connector C2 and a good ground.

Is the FUEL CAP lamp illuminated?

Go to Step 3

Go to Step 4

3

Inspect for poor connections at ECM connector C2. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 5

4

Test the fuel cap missing control circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 6

5

Important: Program the replacement ECM.

Replace the ECM. Refer to Engine Control Module Replacement .

Did you complete the replacement?

Go to Step 8

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6

Inspect for poor connections at the instrument panel cluster connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 7

7

Important: Program the replacement IPC.

Replace the IPC. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2