Pinpoint Test Al : The Low Oil Pressure RTT (RECONFIGURABLE Telltale) Warning Indicator Is Never Or Always On: Notes
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
Normal Operation and Fault Conditions
See Low Oil Pressure Warning Indicator. Refer to: Warning Chimes - System Operation and Component Description .
If the engine rpm data or oil pressure warning message is missing for less than 5 seconds, the IPC defaults the low oil pressure RTT warning indicator to the last state (on or off), based upon the last message received.
If the engine rpm data or oil pressure warning message is missing for 5 seconds or longer, the IPC defaults the low oil pressure RTT warning indicator on.
DTC Chart - PCM
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0521 | Engine Oil Pressure Sensor/Switch "A" Circuit Range/Performance | Sets in the PCM when the PCM detects signal variation outside of the module parameters on the hardwired input from the oil pressure sensor. |
| P0522 | Engine Oil Pressure Sensor/Switch "A" Circuit Low | Sets in the PCM when the PCM detects a short to ground on the hardwired input from the oil pressure sensor. |
| P0523 | Engine Oil Pressure Sensor/Switch "A" Circuit High | Sets in the PCM when the PCM detects an open on the hardwired input from the oil pressure sensor. |
| P0524 | Engine Oil Pressure Too Low | Sets in the PCM when the PCM detects low oil pressure. |
Possible Sources
- Wiring, terminals or connectors
- Tachometer concern
- Message center concern
- Engine oil pressure sensor
- Engine oil pressure concern
- GWM concern
- PCM concern
- IPC
Visual Inspection and Diagnostic Pre-checks
Inspect the:
- engine for noise or other symptom indicating a low engine oil pressure concern.
- engine oil pressure sensor for signs of external damage.
- engine oil pressure sensor connector for signs of corrosion.
- harness for damage indicating an open or short to ground.