GM Service Manual Online
For 1990-2009 cars only

Engine Oil Pressure Gauge Always High Gas

Step

Action

Value(s)

Yes

No

1

Did you perform the Instrument Cluster System Check?

--

Go to Step 2

Go to Instrument Cluster System Check

2

  1. Disconnect connector at the Oil Pressure Sender.
  2. Turn the ignition switch to the RUN position.
  3. Connect a fused jumper wire from the Oil Pressure Sender connector cavity A to ground.

Does the oil gauge indicate low pressure?

--

Go to Step 3

Go to Step 4

3

Replace the Oil Pressure Sender. Refer to Engine Oil Pressure Sensor and/or Switch Replacement (5.0L/5.7L); Engine Oil Pressure Sensor and/or Switch Replacement (7.4L) in Engine Controls.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

4

  1. Remove the I/P Cluster.
  2. Connect a J 39200 DMM (continuity) between pin 15 of the I/P Cluster connector and cavity A of the Oil Pressure Sender.

Is continuity present?

--

Go to Step 6

Go to Step 5

5

Locate and repair the open in CKT 31 (TAN) between the Oil Pressure Sender and the I/P Cluster. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

6

Replace the I/P Cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

--

Go to Instrument Cluster System Check

--

Engine Oil Pressure Gauge Always High Diesel

Step

Action

Value(s)

Yes

No

1

Did you perform the Instrument Cluster System Check?

--

Go to Step 2

Go to Instrument Cluster System Check

2

  1. With the engine in operation, measure the actual engine oil pressure.
  2. Compare the actual engine oil pressure with the specified value.

Is the difference between the actual engine oil pressure and the specified engine oil pressure less than 68.95 kPa (10 psi)?

--

Go to Step 3

Go to Oil Pressure Diagnosis and Testing .

3

  1. Disconnect the Oil Pressure Sender.
  2. Connect a fused jumper wire between the Oil Pressure Sender connector, cavity A and ground.

Does the oil pressure gauge indicate any pressure?

--

Go to Step 4

Go to Step 5

4

Replace the Oil Pressure Sender. Refer to Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

5

  1. Remove the I/P Cluster.
  2. Connect a J 39200 DMM (continuity) between the cavity 15 of the I/P Cluster connector, cavity A of the Oil Pressure Sender connector.

Is continuity present?

--

Go to Step 6

Go to Step 7

6

Replace the I/P Cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

--

Go to Instrument Cluster System Check

--

7

Repair the open in CKT 31 (TAN) between the I/P Cluster and the Oil Pressure Sender. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Instrument Cluster System Check

--