GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Pickup - 4WD 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Engine Oil Pressure Gage Inaccurate or Inoperative

Engine Oil Pressure Gage Inaccurate or Inoperative Gas

Step

Action

Value(s)

Yes

No

1

Did you perform the Instrument Cluster System Check?

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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 one red lead of the J 33431-C to Oil Pressure Sender connector cavity A.
  4. Connect the other lead of the J 33431-C to ground.
  5. Adjust the resistance dial to 0 ohms and then to 90 ohms.

Does the oil gauge match the values given?

Low approx. 0ohms/ High approx. 80.

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 Mechanical.

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 connector.

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 Gage Inaccurate or Inoperative 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 the specified value?

68.95 kPa (10 psi)

Go to Step 3

Go to Oil Pressure Diagnosis and Testing .

3
  1. Disconnect the connector at the Oil Pressure Sender.
  2. Place the ignition switch in the RUN position.
  3. Connect one red lead of a J 33431-C at the Oil Pressure 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 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 fused jumper wire between B+, 10 amp fused jumper wire to cavity 22 of the I/P Cluster assembly.
  3. Connect one red lead of a J 33431-C to cavity 15 of the I/P Cluster assembly.
  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 6

Go to Step 7

6

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

--

7

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

Is the repair complete?

--

Go to Instrument Cluster System Check

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