Was the instrument panel cluster (IPC) system check performed?

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Go to Step 2

Go to Instrument Cluster System Check

Is the oil pressure gauge pegged past 80 psi?

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Go to Step 5

Go to Step 3

Does the oil pressure gauge stay at 0 psi?

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Go to Step 7

Go to Step 4

1. Ensure that the engine oil level is correct.
2. Assure that the engine develops adequate oil pressure. Refer to Oil Pressure Diagnosis and Testing for 4.3L Oil Pressure Diagnosis and Testing for 4.8L, 5.3L and 6.0L in Engine Mechanical.
3. Disconnect the oil pressure switch connector.
4. Connect a variable 100 ohms resistance between the oil pressure switch connector cavity A and ground.
5. Turn the ignition switch to the RUN position.
6. Turn the variable resistance (potentiometer) back and forth from maximum to minimum resistance.

Does the oil pressure gauge operate normally?

0 ohms = no oil pressure

88 ohms = maximum oil pressure

Go to Step 11

Go to Step 12

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 for 4.3L Oil Pressure Diagnosis and Testing for 4.8L, 5.3L and 6.0L in Engine Mechanical.
3. Disconnect the oil pressure switch connector.
4. Turn the ignition switch to the RUN position.
5. With a J 39200 DMM measure the voltage between CKT 331 (TAN/WHT) wire cavity A and ground.

Is the voltage within the specified range?

7-9.5 volts

Go to Step 11

Go to Step 6

1. Backprobe (in order to prevent damage to the terminal) the cluster connector with a J 39200 DMM .
2. Measure the voltage between CKT 331 (TAN/WHT) wire cavity A1 and ground.

Is the voltage within the specified range?

7-9.5 volts

Go to Step 10

Go to Step 12

1. Ensure that the engine oil level is correct.
2. Assure that the engine develops adequate oil pressure. Refer to Oil Pressure Diagnosis and Testing for 4.3L Oil Pressure Diagnosis and Testing for 4.8L, 5.3L, and 6.0L in Engine Mechanical.
3. Turn the ignition switch to the RUN position.
4. Disconnect the oil pressure sensor connector.

Is the oil pressure gauge pegged past 80 psi?

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Go to Step 11

Go to Step 8

1. Disconnect the cluster connector.
2. Remove the connector comb.
3. Connect a test lamp between B+ and the TAN\WHT (331) wire cavity A1.

Does the test lamp light?

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Go to Step 9

Go to Step 12

Locate and repair the short to ground in the TAN/WHT wire between the cluster and the oil pressure switch.

Is the repair complete?

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Go to Instrument Cluster System Check

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Locate and repair the open in the TAN/WHT wire between the cluster and the oil pressure switch.

Is the repair complete?

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Go to Instrument Cluster System Check

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Replace the oil pressure switch. Refer to

Is the repair complete?

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Go to Instrument Cluster System Check

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Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

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Go to Instrument Cluster System Check

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