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Cummins ISX CM870 (2003-06) Fault Code: 429 PID: P097 SPN: 97 FMI: 4/4 Water-in-Fuel Indicator Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the water-in-fuel circuit.
Beginning with Engine Serial Number (ESN) 14039654, the temperature sensor return circuit was separated from the pressure sensor return circuit. For ESNs prior to this and with engine wiring harness Part Number 3682854, refer to the Common Pressure/Temperature Sensor Return Circuit above. For this ESN and greater or for any other engine wiring harness part number, refer to the Separate Pressure/Temperature Sensor Return Circuit above.
The water-in-fuel sensor shares return wires in the engine harness with other sensors. An open return can cause multiple fault codes to be active. Before troubleshooting Fault Code 429, check for multiple fault codes.
Possible causes:
1)Signal circuit shorted to ground in the harness, sensor, connector or ECM
Possible repair:
1)Replace the water-in-fuel sensor.2)Replace the ECM.3)Repair or replace the engine harness or sensor extension harness.
Cummins ISX CM870 (2003-06) Fault Code: 428 PID: P097 SPN: 97 FMI: 3/3 Water-in-Fuel Indicator Sensor Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at the water-in-fuel circuit.
Cummins ISX CM870 (2003-06) Fault Code: 426 PID: S231 SPN: 639 FMI: 2/2 Communication between the electronic control module (ECM) and another device on the SAE J1939 data link has been lost.
Cummins ISX CM870 (2003-06) Fault Code: 418 PID: P097 SPN: 97 FMI: 0/15 Water-in-Fuel Indicator – Data Valid But Above Normal Operating Range – Least Severe Level. Water has been detected in the fuel filter.
Cummins ISX CM870 (2003-06) Fault Code: 415 PID: P100 SPN: 100 FMI: 1/1 Engine Oil Rifle Pressure – Data Valid But Below Normal Operating Range – Most Severe Level. Oil pressure signal indicates oil pressure is below the engine protection critical limit.
Cummins ISX CM870 (2003-06) Fault Code: 387 PID: S221 SPN: 1043 FMI: 3/3 Accelerator Pedal Position Sensor Supply Voltage Circuit – shorted high. High voltage detected at sensor supply circuit for the accelerator pedal position sensor.
Cummins ISX CM870 (2003-06) Fault Code: 386 PID: S232 SPN: 1079 FMI: 3/3 Sensor Supply 1 Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 1 circuit.