GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Express 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Engine Oil Pressure Gauge Always High

Engine Oil Pressure Gauge Always High Gasoline

Step

Action

Value(s)

Yes

No

1

Was the Instrument Cluster System Check performed?

--

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 Step 4

3

The oil pressure gauge functions properly.

Inspect the engine for operating conditions, as necessary.

Does the engine oil pressure gauge operate properly?

--

Go to Instrument Cluster System Check

Go to Step 4

4
  1. Disconnect the connector at the fuel pump switch and the oil pressure sensor gauge.
  2. Connect a fused jumper wire between the fuel pump switch and the oil pressure gauge connector, cavity A for CKT 31 (TAN), and ground.

Does the oil pressure gauge indicate any pressure?

--

Go to Step 5

Go to Step 6

5

Replace the fuel pump switch and the oil pressure gauge.

Does the engine oil pressure gauge operate properly?

--

Go to Instrument Cluster System Check

Go to Step 6

6
  1. Disconnect the connector at the instrument cluster.
  2. Connect a J 39200 between the instrument cluster connector, cavity B8, and the fuel pump switch and the oil pressure gauge connector, cavity A, for CKT 31 (TAN).

Is continuity present?

--

Go to Step 7

Go to Step 8

7

Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Does the engine oil pressure gauge operate properly?

--

Go to Instrument Cluster System Check

--

8

Repair the open in CKT 31 (TAN) between the instrument cluster and the fuel pump switch and oil pressure gauge.

Does the engine oil pressure gauge operate properly?

--

Go to Instrument Cluster System Check

--

Engine Oil Pressure Gauge Always High Diesel

Step

Action

Value(s)

Yes

No

1

Was the Instrument Cluster System Check performed?

--

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 Step 4

3

The oil pressure gauge functions properly.

Inspect the engine for operating conditions, as necessary.

Does the engine oil pressure gauge operate properly?

--

Go to Instrument Cluster System Check

Go to Step 4

4
  1. Disconnect the connector at the fuel pump switch and the engine oil pressure indicator sender.
  2. Connect a fused jumper wire between the fuel pump switch and the engine oil pressure indicator sender connector, cavity A for CKT 31 (TAN), and ground.

Does the oil pressure gauge indicate any pressure?

--

Go to Step 5

Go to Step 6

5

Replace the fuel pump switch and the engine oil pressure indicator sender.

Does the engine oil pressure gauge operate properly?

--

Go to Instrument Cluster System Check

Go to Step 6

6
  1. Disconnect the connector at the instrument cluster.
  2. Connect a J 39200 between the instrument cluster connector, cavity B8, and the fuel pump switch and the engine oil pressure indicator sender connector, cavity A, for CKT 31 (TAN).

Is continuity present?

--

Go to Step 7

Go to Step 8

7

Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Does the engine oil pressure gauge operate properly?

--

Go to Instrument Cluster System Check

--

8

Repair the open in CKT 31 (TAN) between the instrument cluster and the fuel pump switch and the engine oil pressure indicator sender.

Does the engine oil pressure gauge operate properly?

--

Go to Instrument Cluster System Check

--

Engine Oil Pressure Gauge Always High Gasoline Export

Step

Action

Value(s)

Yes

No

1

Was the Instrument Cluster System Check performed?

--

Go to Step 2

Go to Instrument Cluster System Check

2
  1. Turn the ignition switch to the RUN position.
  2. Inspect the actual engine oil pressure.
  3. Inspect the oil pressure gauge

Are the actual engine oil pressure and the oil pressure gauge approximately 10 psi of each other?

--

Go to Step 3

Go to Step 4

3

Inspect the engine for operating problems.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

4
  1. Disconnect the connector at the fuel pump switch and oil pressure gauge sensor. Connect a fused jumper wire between the following components:
    2. • The fuel pump switch and oil pressure gauge sensor connector cavity A for the CKT 31 (TAN) wire
    • Ground
  2. Observe the oil pressure gauge.

Does the oil pressure gauge indicate 0 psi or less?

--

Go to Step 5

Go to Step 6

5

Replace the fuel pump switch and oil pressure gauge indicator sensor.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

6
  1. Disconnect the connector at the instrument cluster.
  2. Connect a J 39200 between the following components:
    3. • The instrument cluster connector cavity B8
    • The fuel pump switch and oil pressure gauge sensor connector cavity A for the CKT 31 (TAN) wire

Is continuity present?

--

Go to Step 7

Go to Step 8

7

Replace the instrument cluster.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

8
  1. Locate the open in the CKT 31 (TAN) wire between the following components:
    2. • The instrument cluster
    • The fuel pump switch and oil pressure gauge sensor
  2. Repair the open in the CKT 31 (TAN) wire between the following components:
    3. • The instrument cluster
    • The fuel pump switch and oil pressure gauge sensor

Is the repair complete?

--

Go to Instrument Cluster System Check

--

Engine Oil Pressure Gauge Always High Diesel Export

Step

Action

Value(s)

Yes

No

1

Was the Instrument Cluster System Check performed?

--

Go to Step 2

Go to Instrument Cluster System Check

2
  1. Turn the ignition switch to the RUN position.
  2. Inspect the actual engine oil pressure.
  3. Inspect the oil pressure gauge

Are the actual engine oil pressure and the oil pressure gauge approximately 10 psi of each other?

--

Go to Step 3

Go to Step 4

3

Inspect the engine for operating problems.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

4
  1. Disconnect the connector at the fuel pump switch and oil pressure gauge sensor. Connect a fused jumper wire between the following components:
    2. • The fuel pump switch and oil pressure gauge sensor connector cavity A for the CKT 31 (TAN) wire
    • Ground
  2. Observe the oil pressure gauge.

Does the oil pressure gauge indicate 0 psi or less?

--

Go to Step 5

Go to Step 6

5

Replace the fuel pump switch and oil pressure gauge indicator sensor.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

6
  1. Disconnect the connector at the instrument cluster.
  2. Connect a J 39200 between the following components:
    3. • The instrument cluster connector cavity B8
    • The engine oil pressure indicator sensor connector cavity A for the CKT 31 (TAN) wire

Is continuity present?

--

Go to Step 7

Go to Step 8

7

Replace the instrument cluster.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

8
  1. Locate the open in the CKT 31 (TAN) wire between the following components:
    2. • The instrument cluster
    • The fuel pump switch and oil pressure gauge sensor
  2. Repair the open in the CKT 31 (TAN) wire between the following components:
    3. • The instrument cluster
    • The engine oil pressure indicator sender

Is the repair complete?

--

Go to Instrument Cluster System Check

--