RAM 3500 Truck 4WD V10-8.0L VIN W (1997)
Oil Pressure Warning Lamp/Indicator: Testing and Inspection
The diagnosis found here addresses an inoperative low oil pressure warning lamp condition. If the problem being diagnosed is related to lamp accuracy,
be certain to confirm that the problem is with the lamp and not with the engine oiling system. The actual engine oil pressure should be checked with a
test gauge before you proceed with lamp diagnosis.
Oil Pressure Switch/sending Unit
1.
Turn the ignition switch to the On position. Unplug the oil pressure sending unit wire harness connector. Install a jumper wire between the oil
pressure switch sense circuit cavity of the sending unit wire harness connector and a good ground. The lamp should light. Remove the jumper
wire and the lamp should go off.
2.
Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Remove the instrument cluster bezel and the
cluster assembly Unplug the right instrument cluster wire harness connector.
3.
Probe the oil pressure switch sense circuit cavity of the right instrument cluster wire harness connector and check for continuity to a good ground.
There should be no continuity. If OK, go to Step 4. If not OK, repair the short circuit as required.
4. Check for continuity between the oil pressure switch sense circuit cavities of the right instrument cluster wire harness connector and the sending
unit wire harness connector. There should be continuity. If OK, replace the faulty bulb. If not OK, repair the open circuit as required.
