GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Express 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Engine Oil Pressure Gage Inaccurate or Inoperative

Step

Action

Value(s)

Yes

No

1

Did you review the instrument cluster circuit description and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms

2

Start the engine and allow to reach operating temperature.

Does the engine oil pressure gauge read normal?

--

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3
  1. Turn the ignition switch OFF.
  2. Install a mechanical oil pressure gauge.
  3. Start and idle the engine.
  4. Measure the actual engine oil pressure.
  5. Compare the actual engine oil pressure to the pressure indicated by the instrument cluster oil pressure gauge.

Is the difference between the actual engine oil pressure and the indicated engine oil pressure less than the specified value?

68.95 kPa (10 psi)

Go to Step 6

Go to Step 4

4
  1. Disconnect the engine oil pressure gauge sensor.
  2. Place the ignition switch in RUN.
  3. Connect 1 red lead of a J 33431-C to engine oil pressure gauge sensor connector cavity A for CKT 31 (TAN).
  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 8

Go to Step 5

5
  1. Disconnect the instrument cluster.
  2. Connect a J 36169-A fused jumper wire between B+ and instrument cluster cavity B17 for CKT 39 (PNK). Refer to Circuit Testing in Wiring Systems.
  3. Connect a J 36169-A fused jumper wire between instrument cluster cavity B13 for CKT 451 (BLK/WHT) and ground.
  4. Connect 1 red lead of a J 33431-C to instrument cluster cavity B8 for CKT 31 (TAN).
  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 9

6

The oil pressure gauge functions properly.

Inspect the engine for proper operating conditions. Refer to:

    •  Oil Pressure Diagnosis and Testing in Engine Mechanical - 4.3L
    •  Oil Pressure Diagnosis and Testing in Engine Mechanical - 5.0L, 5.7L
    •  Oil Pressure Diagnosis and Testing in Engine Mechanical - 6.5L
    •  Oil Pressure Diagnosis and Testing in Engine Mechanical - 7.4L

Is the engine oil pressure gauge operative?

--

Go to Step 10

Go to Step 3

7

Repair the open in CKT 31 (TAN) between the instrument cluster and the engine oil pressure gauge sensor. Refer to Wiring Repairs in Wiring Systems.

Is the engine oil pressure gauge operative?

--

Go to Step 10

Go to Step 3

8

Replace the engine oil pressure gauge sensor. Refer to:

    •  Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical - 4.3L
    •  Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical - 5.0L, 5.7L
    •  Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical - 6.5L
    •  Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical - 7.4L

Is the engine oil pressure gauge operative?

--

Go to Step 10

Go to Step 3

9

Replace the instrument cluster Refer to Instrument Cluster Replacement .

Is the engine oil pressure gauge operative?

--

Go to Step 10

Go to Step 3

10

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3