P0524

P0524-ENGINE OIL PRESSURE TOO LOW





For a complete wiring diagram Refer to Diagrams/Electrical.

Theory of Operation


The engine oil pressure switch is used by the ECM to monitor the lubricating oil pressure. If the oil pressure drops below the engine protection limit, the switch will open and cause the fault to log. The oil pressure switch is normally closed when the engine is not running and open when oil pressure is present. When the fault is set, the ECM illuminates the MIL light. There will be a torque derate issued by the ECM limiting the power output of the engine. The ECM will turn off the torque derate when the oil pressure reading is detected to be within the normal operating range. The ECM will turn off the MIL light after the diagnostic runs and passes in 4 consecutive drive cycles.

- When Monitored:
While the engine is running.

- Set Condition:
The oil pressure detected by the ECM is less than a calibrated value.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview


Diagnostic Test


1. LOW OIL LEVEL
Check the engine oil level.
Is the engine oil in the safe operating range?

Yes


- Go To 2


No


- Repair any condition that may cause the oil level to be above or below the safe operating range.
- Perform POWERTRAIN VERIFICATION TEST VER - 6.7L. Powertrain Verification Test



2. SIGNAL CIRCUIT SHORT TO GROUND
With the scan tool, erase DTCs.
Turn the ignition off.
Disconnect the oil pressure switch harness connector.
Turn the ignition on for 1 minute.
Did DTC P0521 set?

Yes


- Go To 3


No


- Repair the (G6) signal circuit shorted to ground.
- Perform POWERTRAIN VERIFICATION TEST VER - 6.7L. Powertrain Verification Test



3. OIL PRESSURE SWITCH
Measure the engine oil pressure with a mechanical gauge.
Is the oil pressure within the acceptable operating range?

Yes


- Replace the oil pressure switch.
- Perform POWERTRAIN VERIFICATION TEST VER - 6.7L. Powertrain Verification Test


No


- Repair internal engine damage.
- Perform POWERTRAIN VERIFICATION TEST VER - 6.7L. Powertrain Verification Test