GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Tahoe 4WD - RHD 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Engine Oil Pressure Gauge Always Low

Engine Oil Pressure Gauge Always Low 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 connect at the Oil Pressure Sender.
  2. Turn the ignition switch to the RUN position.

Does the oil gauge indicate high pressure (approx. 80 psi or higher)?

--

Go to Step 3

Go to Step 4

3

Replace the Oil Pressure Sender. Refer to Engine Oil Pressure Sensor/Switch Replacement (5.0L/5.7L) in Engine Mechanical, 1999 C/K Service Manual.

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 7 of the I/P Cluster connector and ground.

Is continuity present?

--

Go to Step 6

Go to Step 5

5

Locate and repair the short to ground 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 Low 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)?

68.95 kPa (10 psi)

Go to Step 3

Go to Oil Pressure Diagnosis and Testing in Engine Mechanical, 1999 C/K Service Manual.

3
  1. Disconnect 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 connector, cavity A.
  4. Connect the other lead to ground.
  5. Adjust the tester to 88 ohms.

Does the oil pressure gauge indicate pressure less than the specified value?

211.60 kPa (80 psi)

Go to Step 5

Go to Step 4

4

Replace the Oil Pressure Sender. Refer to Engine Oil Pressure Sensor/Switch Replacement in Engine Mechanical, 1999 C/K Service Manual.

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 cavity 7 of the I/P Cluster and ground.

Is continuity present?

--

Go to Step 7

Go to Step 6

6

Locate repair the short to ground 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

--