Schematic Reference: Instrument Cluster Schematics

Connector End View Reference: Master Electrical Component List

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

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 in Wiring Systems

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 engine oil pressure gage move up and down when commanded?

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Go to Step 4

Go to Step 15

1. Turn OFF the ignition.
2. Disconnect the EOP sensor.
3. Connect a 3-ampere 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:

•	Monitored Oil Pressure parameter in the IPC data list (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?

550 kPa (80 psi)-LG4 only

4.6 V-L18 only

Go to Step 5

Go to Step 6

1. Connect a 3-ampere 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:

•	Monitored Oil Pressure parameter in the IPC data list (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 kPa (0 psi)-LG4 only

0.4 V-L18 only

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?

4.6V

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 in Wiring Systems.

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 in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 10

Test the EOP oil pressure sensor signal circuit for the following:

Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

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 in Wiring Systems.

Did you find and correct the condition?

--

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 in Wiring Systems.

Did you find and correct the condition?

--

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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Important: Program the replacement PCM.

Replace the PCM. Refer to the following procedures:

Did you complete the replacement?

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Go to Step 16

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Replace the IPC. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

--

Go to Step 16

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Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2

Schematic Reference: Instrument Cluster Schematics

Connector End View Reference: Master Electrical Component List

1

Did you perform the Instrument Cluster Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

Start the engine.

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

207-483 kPa (30-70 psi)

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

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 engine oil pressure gage move up and down when commanded?

--

Go to Step 4

Go to Step 14

1. Turn OFF the ignition.
2. Disconnect the engine oil pressure (EOP) sensor.
3. Measure the resistance at the EOP sensor between the EOP sensor signal circuit pin and the 5-volt reference circuit pin.
4. Measure the resistance at the EOP sensor between the 5-volt reference circuit pin and the low reference circuit pin.

Are both of the resistance values within the specified range?

6k-16k ohms

Go to Step 5

Go to Step 10

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 9

Go to Step 6

Test the EOP 5-volt reference circuit for a for the following:

Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 15

Go to Step 7

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 11

Go to Step 8

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

Did you find and correct the condition?

--

Go to Step 15

Go to Step 11

Test the EOP oil pressure sensor signal circuit for the following:

Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 15

Go to Step 11

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 in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 15

Go to Step 12

Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 15

Go to Step 13

Replace the engine oil pressure sensor. Refer to Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical - 6.6L.

Did you complete the replacement?

--

Go to Step 15

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Important: Program the replacement ECM.

Replace the ECM. Refer to Engine Control Module Replacement in Engine Controls - 6.6L.

Did you complete the replacement?

--

Go to Step 15

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Replace the IPC. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

--

Go to Step 15

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Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2