Did you perform the Instrument Cluster Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

Verify that the engine oil pressure gauge is inaccurate or inoperative.

Does the engine oil pressure gauge operate normally?

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

Go to Step 3

Is the oil pressure gauge above 80 psi?

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Go to Step 6

Go to Step 4

Does the oil pressure gauge remain at 0 psi?

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Go to Step 8

Go to Step 5

1. Ensure that the engine oil level is correct.
2. Ensure that the engine develops adequate oil pressure. Refer to Oil Pressure Diagnosis and Testing in Engine Mechanical - 2.2L or Oil Pressure Diagnosis and Testing in Engine Mechanical - 4.3L.
3. Disconnect the oil pressure sensor connector. Refer to Circuit Testing .
4. Connect a J 33431-C between the engine oil pressure sensor connector cavity A and the a good ground.
5. Turn ON the ignition with the engine OFF. Do NOT start the engine.
6. Vary the resistance on the J 33431-C back and forth from 1-100 ohms of resistance.

Does the oil pressure gauge operate normally?

0 ohms (no oil pressure)

88 ohms (maximum oil pressure)

Go to Step 12

Go to Step 13

1. Ensure that the engine oil level is correct.
2. Ensure that the engine develops normal oil pressure. Refer to Oil Pressure Diagnosis and Testing in Engine Mechanical - 2.2L or Oil Pressure Diagnosis and Testing in Engine Mechanical - 4.3L.
3. Disconnect the oil pressure sensor connector. Refer to Circuit Testing in Wiring Systems.
4. Turn ON the ignition, with the engine OFF. Do NOT start the engine.
5. Using a digital multimeter (DMM), measure the voltage between the oil pressure sensor signal circuit and a good ground. Refer to Circuit Testing in Wiring Systems.

Does the voltage measure within the specified range?

7-9.5 volts

Go to Step 12

Go to Step 7

1. In order to prevent damage to the terminal, backprobe the cluster connector using a J 39200 DMM. Refer to Instrument Cluster Replacement .
2. Measure the voltage between the oil pressure signal circuit and a good ground. Refer to Circuit Testing in Wiring Systems.

Does the voltage measure within the specified range?

7-9.5 volts

Go to Step 11

Go to Step 13

1. Ensure that the engine oil level is correct.
2. Ensure that the engine develops adequate oil pressure. Refer to Oil Pressure Diagnosis and Testing in Engine Mechanical - 2.2L or Oil Pressure Diagnosis and Testing in Engine Mechanical - 4.3L.
3. Turn ON the ignition, with the engine OFF. Do NOT start the engine.
4. Disconnect the oil pressure sensor connector.

Does the oil pressure gauge remain past 80 psi?

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Go to Step 12

Go to Step 9

1. Disconnect the instrument cluster connector. Refer to Instrument Cluster Replacement .
2. Remove the connector comb.
3. Using a test lamp, test between a good power source and the oil pressure sensor signal circuit. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

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Go to Step 10

Go to Step 14

Repair the short to ground in the oil pressure sensor signal circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 16

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Repair the open in the oil pressure sensor signal circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 16

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Replace the engine oil pressure sensor. Refer to Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical-2.2L or Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical-4.3L.

Did you complete the replacement?

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Go to Step 16

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1. Disconnect the instrument cluster connector. Refer to Instrument Cluster Replacement .
2. Remove the connector comb.
3. Using the DMM, measure the voltage between the engine oil pressure sensor signal circuit and a good ground. Refer to Circuit Testing in Wiring Systems.

Did you find a short to battery voltage?

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Go to Step 15

Go to Step 14

Replace the Instrument Cluster. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

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Go to Step 16

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Repair the short to battery voltage in the oil pressure sensor signal circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 16

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3