GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

SCHEMATIC REFERENCE: Engine Controls Schematics (2.4L) or Engine Controls Schematics (3.4L) in Engine Controls

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

Start the engine.

Does the engine oil pressure indicator illuminate after the bulb check?

--

Go to Step 3

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

3

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Engine Oil Pressure parameter in the PCM data list.

Does the scan tool display Low?

--

Go to Step 4

Go to Step 9

4

  1. Turn OFF the ignition.
  2. Disconnect the engine oil pressure sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Engine Oil Pressure parameter.

Does the scan tool display OK?

--

Go to Step 7

Go to Step 5

5

Test the signal circuit of the engine oil pressure sensor 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 6

6

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 8

7

Inspect for poor connections at the harness connector of the engine oil pressure sensor. 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 10

8

Important: Program the replacement PCM.

Replace the PCM. Refer to Powertrain Control Module Replacement (2.4L) or Powertrain Control Module Replacement/Programming (3.4L) in Engine Controls.

Did you complete the replacement?

--

Go to Step 11

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9

Replace the IPC. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

--

Go to Step 11

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10

Replace the engine oil pressure sensor. Refer to Engine Oil Pressure Sensor and/or Switch Replacement (2.4L) or Engine Oil Pressure Sensor and/or Switch Replacement (3.4L) in Engine Controls.

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?

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System OK

Go to Step 2