GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  • Turn the ignition switch to the RUN position.

Does the SERVICE ENGINE SOON indicator illuminate?

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Go to Step 2

Go to Gages Inoperative - All

2

  1. Disconnect the engine oil pressure switch connector.
  2. Connect a fused 3 amp jumper between the engine oil pressure switch connector terminal A and ground.
  3. Turn the ignition switch to the RUN position.

Does the oil pressure warning indicator illuminate?

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Go to Step 3

Go to Step 4

3

  1. Inspect for a poor connection at the engine oil pressure switch connector.
  2. If the connection is OK, then replace the engine oil pressure switch.
  3. Inspect the system.

Is the repair complete?

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System OK

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4

  • Inspect for a poor connection or an open in CKT 31.

Does a poor connection or an open in CKT 31 between the instrument cluster harness connector C2 terminal L and the engine oil pressure indicator switch harness connector terminal A exist?

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Go to Step 5

Go to Step 6

5

  1. Repair the poor connection or the open in CKT 31.
  2. Inspect the system.

Is the repair complete?

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System OK

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6

  1. Inspect the warning indicator bulb and the bulb connection.
  2. If OK, replace the instrument cluster. Refer to Instrument Cluster Replacement .
  3. Inspect the system.

Is the repair complete?

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System OK

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