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.
- Connect a fused jumper wire between the engine oil pressure gauge
sensor and the fuel pump switch (Gas and GM Diesel) or the engine oil pressure
gauge sensor (Cat® Diesel) connector terminal A for CKT 331 (TAN)
or CKT 331 (TAN/WHT) and chassis ground. The oil pressure gauge should indicate
the specified value.
Does the oil pressure gauge indicate low pressure?
| 0 kPa (0 psi)
|
Go to Step 4
|
Go to Step 5
|
4
| Replace
the engine oil pressure gauge sensor and fuel pump 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 connector and terminal A
of the engine oil pressure gauge sensor and fuel pump switch harness connector
for CKT 331 (TAN) or CKT 331 (TAN/WHT).
Does the DMM indicate continuity?
| --
| Go to
Instrument Cluster Replacement
|
Go to Step 6
|
6
| Locate and repair the open in CKT 331 (TAN) or CKT 331 (TAN/WHT) between
the instrument cluster and the engine oil pressure gauge sensor and fuel
pump switch.
Is the repair complete?
| --
| System OK
| --
|
