SPN 100 - FMI 4 (Fault Code 143)

SPN 100 - FMI 4 (Fault Code: 143)
ISC and ISL with CM2150 - Engine Oil Rifle Pressure 1

Fault Code: 143
PID(P), SID(S): P100
SPN: 100
FMI: 1/18

REASON: Engine Oil Rifle Pressure - Data Valid but Below Normal Operational Range - Moderately Severe Level. Engine oil pressure signal indicates engine oil pressure is below the engine protection warning limit.

EFFECT: Progressive power derate increasing in severity from time of alert.

Circuit Description:
The electronic control module (ECM) provides a 5 volt supply to the engine oil pressure sensor on the sensor supply 1 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 a 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.

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

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:
The ECM will turn off the amber CHECK ENGINE light and the torque derate will be removed when the oil pressure reading is detected to be within the normal operating range.

Shop Talk:

  • Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
  • This fault code goes active when the engine oil pressure drops below the engine protection limit. Troubleshoot the engine for low oil pressure.

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