GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Instrument Cluster Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

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 engine control module (ECM) instrument panel cluster (IPC) Data, data list - 3.6L.

Does the Engine Oil Level Switch parameter display OK?

Go to Step 3

Go to Step 4

3

Does the low engine oil level indicator remain illuminated after the displays test?

Go to Step 10

Go to Testing for Intermittent Conditions and Poor Connections

4

  1. Turn OFF the ignition.
  2. Disconnect the ECM/powertrain control module (PCM) connector C2.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the signal circuit of the engine oil level switch at the ECM/PCM and battery positive voltage. Refer to Circuit Testing .

Does the test lamp illuminate?

Go to Step 7

Go to Step 5

5

Test the signal circuit of the engine oil level indicator switch for an open, or for a short to voltage. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 6

6

Test the ground of the engine oil level indicator switch for an open. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 8

7

Inspect for poor connections at the ECM/PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 9

8

Inspect for poor connections at the engine oil level switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

Go to Step 12

Go to Step 11

9

Replace the ECM/PCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 12

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10

Replace the IPC. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 12

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11

Replace the engine oil level switch. Refer to Engine Oil Pressure Sensor and/or Switch Replacement for the 3.6L (LY7) engine.

Did you complete the replacement?

Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2