Schematic Reference: Instrument Cluster Schematics

Connector End View Reference: Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle

Start the engine.

Does the engine oil pressure (EOP) gage display within the specified range?

34-483 kPa (5-70 psi) - L18 only

207-483 kPa (30-70 psi)

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, perform the Displays Test in the instrument panel cluster (IPC) scan tool Output Controls.

Does the EOP gage move up and down when commanded?

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Go to Step 4

Go to Step 15

1. Turn the ignition OFF.
2. Disconnect the EOP sensor.
3. Connect a 3-amp fused jumper between the EOP sensor signal circuit and the 5-volt reference circuit of the EOP sensor.
4. With the scan tool, observe one of the following Engine Oil Pressure parameters:

•	Engine Oil Pressure Sensor Parameter in the Fuel Data, data list (LBZ, LLY, LMM, LF8, and LG4 only)

•	Engine Oil Pressure Sensor parameter in the powertrain control module (PCM) Engine Data 2 data list (L18 only)

Does the scan tool indicate that the Engine Oil Pressure parameter is at or greater than the specified value?

4.6 V

Go to Step 5

Go to Step 6

1. Connect a 3-amp fused jumper between the EOP sensor signal circuit and the low reference circuit of the EOP sensor.
2. With the scan tool, observe one of the following engine oil pressure parameters:

•	Engine Oil Pressure Sensor Parameter in the Fuel Data, data list (LBZ, LLY, LMM, LF8, and LG4 only)

•	Engine Oil Pressure Sensor parameter in the PCM Engine Data 2 data list (L18 only)

Does the scan tool indicate that the Engine Oil Pressure parameter is at or less than the specified value?

0.4 V

Go to Step 11

Go to Step 7

1. Disconnect the fused jumper.
2. Measure the voltage between the 5-volt reference circuit of the EOP sensor and the low reference circuit of the EOP sensor.

Does the voltage measure greater than the specified value?

4.6 V

Go to Step 10

Go to Step 8

1. Disconnect the negative battery cable.
2. Measure the resistance from the low reference circuit of the EOP sensor to a good ground.

Does the resistance measure less than the specified value?

5 ohms

Go to Step 12

Go to Step 9

Test the EOP 5-volt reference circuit for a for an open, for a short to ground, or for a high resistance. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

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Go to Step 16

Go to Step 9

Test the EOP low reference circuit for high resistance or for an open. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

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Go to Step 16

Go to Step 10

Test the EOP oil pressure sensor signal circuit for a for an open, for a short to ground, or for a high resistance. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

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Go to Step 16

Go to Step 12

Inspect for poor connections at the harness connector of the EOP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

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Go to Step 16

Go to Step 13

Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

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Go to Step 16

Go to Step 14

Replace the engine oil pressure sensor. Refer to the following procedures:

Did you complete the replacement?

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Go to Step 16

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

Did you complete the replacement?

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Go to Step 16

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

Did you complete the replacement?

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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 2