GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: The engine oil level is low, but the CHECK OIL LEVEL message does not display on the DIC.

1

Did you perform the Instrument Cluster Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Engine Oil Level Switch parameter in the powertrain control module (PCM) data list.

Does the scan tool display OK?

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Go to Step 3

Go to Step 9

3

  1. Turn OFF the ignition.
  2. Disconnect the engine oil level switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Engine Oil Level Switch parameter.

Does the scan tool display LOW?

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Go to Step 6

Go to Step 4

4

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

Did you find and correct the condition?

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Go to Step 10

Go to Step 5

5

Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 10

Go to Step 7

6

Inspect for poor connections at the harness connector of the engine oil level switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 10

Go to Step 8

7

Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls - 4.6L.

Did you complete the replacement?

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Go to Step 10

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8

Replace the engine oil level switch. Refer to Engine Oil Level Sensor Replacement .

Did you complete the replacement?

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Go to Step 10

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9

Replace the instrument cluster (IPC). Refer to Instrument Cluster Replacement .

Did you complete the replacement?

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Go to Step 10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2