CM870 and ISX Engines – FAULT CODE 143

Engine Oil Pressure Low – Warning


Fault Code: 143
PID: P100
SPN: 100
FMI: 1/18
LAMP: Amber

Engine Oil Pressure Low – Warning. Engine oil pressure signal indicates engine oil pressure is below the engine protection warning limit.

Progressive power derate increasing in severity from time of alert.

Engine Oil Pressure

Circuit Description

The engine oil pressure sensor monitors oil pressure and passes information to the electronic control module (ECM) through the engine harness. If the oil pressure becomes too low based on engine speed, it will cause a derate condition.

Component Location

The engine oil pressure sensor is located on the left side of the engine block, below and to the rear of the integrated fuel system module (IFSM). Refer to Section E for a detailed component location view.

Shop Talk

The engine oil pressure sensor measures the pressure of the oil in the oil rifle on the left-hand side of the engine block.

Possible causes of this fault code include:

  • Mechanical failures such as lubricating oil pump, lubricating oil high pressure relief valve, loose lubricating oil filter
  • Breakdown or contamination of the lubricating oil
  • Plugged lubricating oil filter.

Refer to Troubleshooting Fault Code t05-143

Last Modified:  01-Sep-2010