GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Savana 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Engine Oil Pressure Gage Inaccurate or Inoperative

Engine Oil Pressure Gage Inaccurate or Inoperative 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)?

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.

Is the engine oil pressure gauge operative?

--

Go to Instrument Cluster System Check

Go to Step 4

4
  1. Disconnect the connector at the fuel pump switch and the oil pressure gauge sensor.
  2. Place the ignition switch in the RUN position.
  3. Connect 1 red lead of a J 33431-C at the fuel pump switch and the oil pressure gauge, cavity A.
  4. Connect the other lead to ground.
  5. Adjust the tester to 0 ohms.
  6. Adjust the tester to 88 ohms.

Does the oil pressure gauge indicate the specified values after each adjustment of the tester?

0 kPa (0 psi)

551.6 kPa (80 psi)

Go to Step 5

Go to Step 6

5

Replace the fuel pump switch and the oil pressure gauge.

Is the engine oil pressure gauge operative?

--

Go to Instrument Cluster System Check

Go to Step 6

6
  1. Disconnect the connector at the instrument cluster.
  2. Connect a fused jumper wire between B+ and the instrument cluster connector, cavity B17.
  3. Connect a fused jumper wire between the instrument cluster connector, cavity B13, for CKT 451 (BLK/WHT), and ground.
  4. Connect 1 RED lead of a J 33431-C at the instrument cluster connector, cavity B8.
  5. Connect the other lead to ground.
  6. Adjust the tester to 0 ohms.
  7. Adjust the tester to 88 ohms.

Does the oil pressure gauge indicate the specified values after each adjustment of the tester?

0 kPa (0 psi)

551.6 kPa (80 psi)

Go to Step 7

Go to Step 8

7

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

Is the engine oil pressure gauge operative?

--

Go to Instrument Cluster System Check

--

8

Replace the instrument cluster Refer to Instrument Cluster Replacement .

Is the engine oil pressure gauge operative?

--

Go to Instrument Cluster System Check

--

Engine Oil Pressure Gage Inaccurate or Inoperative 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)?

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.

Is the engine oil pressure gauge operative?

--

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. Place the ignition switch in the RUN position.
  3. Connect 1 red lead of a J 33431-C at the fuel pump switch and the engine oil pressure indicator sender, cavity A.
  4. Connect the other lead to ground.
  5. Adjust the tester to 0 ohms.
  6. Adjust the tester to 88 ohms.

Does the oil pressure gauge indicate the specified values after each adjustment of the tester?

0 kPa (0 psi)

551.6 kPa (80 psi)

Go to Step 5

Go to Step 6

5

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

Is the engine oil pressure gauge operative?

--

Go to Instrument Cluster System Check

Go to Step 6

6
  1. Disconnect the connector at the instrument cluster.
  2. Connect a fused jumper wire between B+ and the instrument cluster connector, cavity B17.
  3. Connect a fused jumper wire between the instrument cluster connector, cavity B13, for CKT 451 (BLK/WHT), and ground.
  4. Connect 1 read lead of a J 33431-C at the instrument cluster connector, cavity B8.
  5. Connect the other lead to ground.
  6. Adjust the tester to 0 ohms.
  7. Adjust the tester to 88 ohms.

Does the oil pressure gauge indicate the specified values after each adjustment of the tester?

0 kPa (0 psi)

551.6 kPa (80 psi)

Go to Step 7

Go to Step 8

7

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

Is the engine oil pressure gauge operative?

--

Go to Instrument Cluster System Check

--

8

Replace the instrument cluster Refer to Instrument Cluster Replacement .

Is the engine oil pressure gauge operative?

--

Go to Instrument Cluster System Check

--

Engine Oil Pressure Gage Inaccurate or Inoperative 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.
  2. Turn the ignition switch to the RUN position.
  3. Connect the one red lead of the J 33431-C at the fuel pump switch and oil pressure gauge sensor.
  4. Connect the other lead of the J 33431-C to ground.
  5. Adjust the J 33431-C to 0 ohms.
  6. Observe the oil pressure gauge.
  7. Adjust the J 33431-C to 88 ohms.
  8. Observe the oil pressure gauge.

Does the oil pressure gauge indicate 0 psi, then approximately 88 psi?

--

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 fused jumper wire between the following components:
    3. • B+
    • The instrument cluster connector cavity B17
  3. Connect a fused jumper wire between the following components:
    4. • The instrument cluster connector B13 for the CKT 451 (BLK/WHT)
    • Ground
  4. Connect one red lead of the J 33431-C at the instrument cluster connector cavity B8
  5. Connect the other lead to ground
  6. Adjust the J 33431-C to 0 ohms.
  7. Observe the oil pressure gauge.
  8. Adjust the J 33431-C to 88 ohms.
  9. Observe the oil pressure gauge

Does the oil pressure gauge operate correctly?

--

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 Gage Inaccurate or Inoperative 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 engine oil pressure indicator sender.
  2. Turn the ignition switch to the RUN position.
  3. Connect the one red lead of the J 33431-C at the engine oil pressure indicator sensor connector cavity A.
  4. Connect the other lead of the J 33431-C to ground.
  5. Adjust the J 33431-C to 0 ohms.
  6. Observe the oil pressure gauge.
  7. Adjust the J 33431-C to 88 ohms.
  8. Observe the oil pressure gauge.

Does the oil pressure gauge indicate 0 psi, then approximately 88 psi?

--

Go to Step 5

Go to Step 6

5

Replace the engine oil pressure indicator sender.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

6
  1. Disconnect the connector at the instrument cluster.
  2. Connect a fused jumper wire between the following components:
    3. • B+
    • The instrument cluster connector cavity B17
  3. Connect a fused jumper wire between the following components:
    4. • The instrument cluster connector B13 for the CKT 451 (BLK/WHT)
    • Ground
  4. Connect one red lead of the J 33431-C at the instrument cluster connector cavity B8
  5. Connect the other lead to ground
  6. Adjust the J 33431-C to 0 ohms.
  7. Observe the oil pressure gauge.
  8. Adjust the J 33431-C to 88 ohms.
  9. Observe the oil pressure gauge

Does the oil pressure gauge operate correctly?

--

Go to Step 8

Go to Step 7

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 engine oil pressure indicator sender
  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

--