Step
| Action
| Value(s)
| Yes
| No
|
1
|
- Check the actual engine oil pressure while the engine is running.
- Compare this value to the indicated value. The oil pressure gauge
should indicate approximately the same as the actual pressure, within about
69 kPa (10 psi).
Is the oil pressure gauge reasonably accurate?
| --
|
Go to Step 2
|
Go to Step 3
|
2
| This indicates that the oil pressure gauge is functioning
properly. Check the engine for operating problems, if appropriate.
Is the repair complete?
| --
| System OK
| --
|
3
|
- Disconnect the connector at the engine oil pressure gauge sensor.
- Place the ignition switch in the RUN position.
- Connect one red lead of a J 33431-B
at terminal A of the engine oil pressure sensor connector
for CKT 31 (TAN)(GM Diesel) or CKT 331 (TAN/WHT)(Gas/Cat® Diesel).
- Connect the other lead to chassis ground.
- Adjust the tester to 88 ohms. The oil pressure gauge should
indicate the specified value.
Does the oil pressure gauge indicate low or no pressure?
| 550 kPa (80 psi)
|
Go to Step 4
|
Go to Step 5
|
4
| Replace the
engine oil pressure gauge switch. Refer to Engine Oil Pressure Switch Replacement (Gasoline)
or Engine Oil Pressure Switch Replacement (7.2L Diesel)
or Engine Oil Pressure Switch Replacement (6.5L Diesel)
.
Does the engine oil pressure gauge still indicate high pressure?
| --
| --
| System OK
|
5
|
- Disconnect the connector at the instrument cluster.
- Connect a J 39200
DMM between terminal 21 of the instrument cluster harness connector
and terminal A of the engine oil pressure gauge sensor harness
connector for CKT 31 (TAN)(GM Diesel) or CKT 331 (TAN/WHT)(Gas/Cat®
Diesel).
Does the DMM indicate continuity?
| --
|
Go to Step
6
| Go to
Instrument Cluster Replacement
|
6
| Locate and repair the short to ground in CKT 31 (TAN)(GM Diesel) or
CKT 331 (TAN/WHT)(Gas/Cat® Diesel) between the instrument cluster
and the engine oil pressure gauge sensor.
Is the repair complete?
| --
| System OK
| --
|
