PINPOINT TEST AU : The Low Oil Pressure Reconfigurable Telltale (RTT) Is Never or Always On: Notes

WARNING: This page is about a different car, the 2016 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 Reconfigurable Telltale (RTT). 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 Reconfigurable Telltale (RTT) to the last state (on or off), based upon the last known good oil pressure status message.

If the IPC fails to receive the oil pressure Reconfigurable Telltale (RTT) 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 or active.

Possible Sources

Wiring, terminals or connectors
Tachometer concern
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 tachometer to ensure that it is functioning correctly.
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.