© 2008 Cummins Inc., Box 3005, Columbus, IN 47202-3005 U.S.A. Printed from QuickServe® Online.All Rights Reserved. Last Modified: 02-Mar-2011

File: 79-fc143 Page 1 of 2

Fault Code 143

Oil Pressure - Engine Protection

CODES REASON EFFECT

Fault Code: 143PID(P), SID(S): P100SPN: 100FMI: 1/18Lamp: Engine Protection orYellow*SRT: 00-057

Low oil pressure has beendetected. Voltage at oil pressuresignal pin 7 of the sensor harnessconnector indicates oil pressurelower than 55 kPa [8 psi] at idle to800 rpm; 55 to 173 kPa [8 to 25 psi]at 800 to 1200 rpm; 173 to 208 kPa[25 to 30 psi] at 1200 to 2400 rpmfor M11, 138 to 208 kPa [20 to 30psi] at 1200 to 2400 rpm for N14.

Progressive power and speed derate withincreasing time after alert. If Engine ProtectionShutdown is enabled, engine will shut down 30seconds after the engine protection lamp or theRed lamp* starts flashing.

Oil Pressure Sensor Circuit

Circuit Description:The electronic control module (ECM) uses the oil pressure sensor to monitor the lubricating oil pressure. The ECMconverts the signal pin voltage to a pressure value. The ECM uses this value for the engine protection system.

Component Location:M11 - The oil pressure sensor is located on the engine block to the right of the ECM.N14 - The oil pressure sensor is on the engine block, near the pan rail, on the fuel pump side of the engine.

Shop Talk:Verify with the driver the engine speed at which the fault occurs. If the engine is operated at too low of a speed underload, oil pressure can drop below the engine protection limits.Use breakout cable Part Number 3824775, between the oil pressure sensor and the sensor connector, keyswitch “ON”and oil pressure sensor connected and disconnected; confirm the supply voltage is 4.75 to 5.25 VDC.* Applies to 98N14 and 98M11 calibrations only.

Refer to Troubleshooting Fault Code t05-143

© 2008 Cummins Inc., Box 3005, Columbus, IN 47202-3005 U.S.A. Printed from QuickServe® Online.All Rights Reserved. Last Modified: 02-Mar-2011

File: 79-fc143 Page 2 of 2