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Cummins ISX12 CM2250 (2010-12) Fault Code: 143 PID: 100 SPN: 100 FMI: 18 Engine Oil Rifle Pressure- Data Valid But Below Normal Operating Range- Moderately Severe Level

Circuit Description
The engine control module (ECM) provides a 5 volt supply to the engine oil pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The engine oil pressure sensor provides a signal to the ECM on the engine oil pressure sensor signal circuit. This sensor signal voltage changes, based on the pressure in the oil rifle. The ECM will detect a low signal voltage at operating conditions when the oil pressure may be slightly lower. The ECM will detect a high signal voltage during high engine speeds or operating conditions when the oil temperature is low.

If the ECM detects low signal voltage, indicating low engine oil pressure, this fault code sets.

Component Location
The engine oil pressure sensor is located on the left side of the engine block.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position and the engine is operating.

Conditions for Setting the Fault Codes
The ECM detects that the engine oil pressure is less than the engine protection limits for more than 5 seconds.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
A torque derate issued by the ECM limits the power output of the engine.
Conditions for Clearing the Fault Code
To validate the repair using a Diagnostic Road Test, utilize a route that incorporates both stop-and-go city driving and steady state highwaye driving. It may be necessary to load the unit for certain diagnostics in the ECM to run.
To validate the repair using a Chassis Dynamometer Test, utilize a routine that incorporates acceleration and motoring events, steady state highway operation, and load. This will simulate normal driving and allow the diagnostics in the ECM to run.
The fault code status displayed by INSITE? electronic service tool will change to INACTIVE and the torque derate will be removed immediately after the oil pressure reading is detected to be within the normal operating range and the diagnostic runs and passes.
The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.
The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults.

Shop Talk
Possible causes of this fault code include:

Low oil pressure
Incorrect oil level
Degraded, diluted, or incorrect engine oil.

Possible Cause:
1) ECM calibration