Engine - Incorrect or Erratic Oil Pressure

NUMBER:
93-T-23

CORP.REF.NO:
268304

DATE:
December 1992

SECTION:
6



SUBJECT:
INCORRECT OR ERRATIC OIL PRESSURE READINGS - INSTALL NEW [1][2]OIL PRESSURE SENSOR

MODELS/YEARS:
1991-93 BRAVADA W/4.3L (VIN W, Z) ENGINE



CONDITION:
Owners of some 1991-93 Bravadas may comment that the oil pressure dash gauge reads high, has erratic movement or is inoperative.

CAUSE:
The internal resistance wire in the [1][2]oil pressure sensor may not be properly supported, resulting in an intermittent open condition.

CORRECTION:
Check for normal causes of high oil pressure gauge readings (high resistance or open circuit), such as a poor ground path caused by loose sensor mounting, oil cooler adapter loose, or poor electrical connections. If no cause can be found, replace the [1][2]oil pressure sensor following the procedure below.

1. Disconnect the negative battery cable.

2. Remove the wiring harness connector from the [1][2]oil pressure sensor.

3. Remove the [1][2]oil pressure sensor.

4. Install the new [1][2]oil pressure sensor. The following parts are currently available form GMSPO:

Engine VIN Code W - P/N 10201490
Engine VIN Code Z - P/N 10201491

5. Connect the wiring harness connector to the [1][2]oil pressure sensor.

6. connect the negative battery cable.