GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Instrument Cluster Schematics

1

Did you perform the Instrument Cluster Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

Start the engine.

Does the engine oil pressure indicator illuminate after the displays test?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

  1. Install a scan tool.
  2. With a scan tool, observe the Engine Oil Pressure Switch parameter in the PCM Engine Data 3 list.

Does the Engine Oil Pressure Switch parameter display OK?

Go to Step 10

Go to Step 4

4

  1. Turn OFF the ignition.
  2. Disconnect the engine oil pressure switch connector.
  3. Start the engine.
  4. With the scan tool, observe the Engine Oil Pressure Switch parameter.

Does the Engine Oil Pressure Switch parameter display OK?

Go to Step 6

Go to Step 5

5

Test the oil pressure switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

6

Inspect for poor connections at the harness connector of the engine oil pressure switch. 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 11

Go to Step 8

7

Inspect for poor connections at the harness connector of the PCM. 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 11

Go to Step 9

8

Replace the engine oil pressure switch. Refer to Engine Oil Pressure Sensor or Switch Replacement .

Did you complete the replacement?

Go to Step 11

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9

Important: Program the replacement PCM.

Replace the PCM. Refer to Powertrain Control Module Replacement (2.2L) or Powertrain Control Module Replacement (2.4L) in Engine Controls.

Did you complete the replacement?

Go to Step 11

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10

Replace the IPC. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2