Pinpoint Test AE : The Low Engine Oil Pressure Indicator Is Never Or Always On: Notes
Refer to Instrument Cluster for schematic and connector information.
Normal Operation and Fault Conditions
See Low Engine Oil Pressure Warning Indicator. REFER to: Message Center - System Operation and Component Description .
See Low Engine Oil Pressure RTT. REFER to: Message Center - System Operation and Component Description .
If the oil pressure warning indicator request or engine RPM data messages are missing less than 5 seconds, the IPC defaults the low engine oil pressure warning indicator or low engine oil pressure RTT to the last state (on or off), based upon the last message received.
If the oil pressure warning indicator request or engine RPM data messages are missing for 5 seconds or longer, the IPC defaults the low engine oil pressure warning indicator or low engine oil pressure RTT 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 engine 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 engine 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 engine oil pressure sensor. |
| P0524 | Engine Oil Pressure Too Low | Sets in the PCM when the PCM detects low engine oil pressure. |
| P055F | Engine Oil Pressure Out of Range | Sets in the PCM when the PCM detects high engine oil pressure. |
| P1678 | Low Oil Pressure Lamp Control Circuit | Sets in the PCM when a fault is detected on the engine oil pressure switch input. |
Possible Sources
- Wiring, terminals or connectors
- Tachometer concern
- Message center concern
- Engine oil pressure concern
- Engine oil pressure sensor
- GWM concern
- PCM
- IPC
Visual Inspection and Diagnostic Pre-checks
Inspect the:
- check engine oil level.
- 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.