Pinpoint Test W : The Low Oil Pressure Indicator Is Never Or Always On: Notes
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Instrument Cluster for schematic and connector information.
Normal Operation and Fault Conditions
See Low Oil Pressure Indicator. Refer to Information And Message Center .
NOTE:
If DTC U0100:00 sets in the IPC, other observable symptoms can be an inoperative speedometer, tachometer, temperature gauge or odometer.
If the IPC fails to receive the oil pressure warning indicator message from the PCM for less than 5 seconds, the IPC defaults the low oil pressure warning indicator to the last state (on or off), based upon the last message received.
If the IPC fails to receive the oil pressure warning indicator message from the PCM for 5 seconds or longer, the IPC sets DTC U0100:00 in continuous memory and defaults the low oil pressure warning indicator on.
Possible Sources
- Wiring, terminals or connectors
- Engine oil pressure switch
- Base engine concern
- PCM concern
- IPC
Visual Inspection and Diagnostic Pre-checks
- Start the engine and listen for engine noise that indicates a low engine oil pressure concern.
- Inspect the engine oil pressure switch for signs of external damage.
- Inspect the engine oil pressure switch connector for signs of corrosion and inspect the harness for damage indicating a cut, open or circuit shorted to ground.