Cummins ISB CM850 (2003-06) Fault Code: 429 (Auto) PID: 97 SPN: 97 FMI: 4 Water-in-Fuel Indicator Sensor Circuit - Voltage Below Normal or Shorted to Low Source. Low voltage detected at the water-in-fuel circuit.

The water-in-fuel sensor is integrated into the fuel filter; it is automatically replaced whenever the fuel filter is replaced. For marine applications the sensor is not integrated into the fuel filter and is a serviceable item.

Possible causes:

1)Signal circuit shorted to ground in the harness, sensor, or connector.

Possible repairs:

1)Flush the dirt, debris, or moisture from the connector pins.
2)Install the appropriate connector seal if it is damaged or missing.
3)Replace the water-in-fuel sensor.
4)Replace the ECM.
5)Repair or replace the damaged engine harness.

Cummins ISB CM850 (2003-06) Fault Code: 428 (Marine) PID: 97 SPN: 97 FMI: 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 ISB CM850 (2003-06) Fault Code: 428 (Auto) PID: 97 SPN: 97 FMI: 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 ISB CM850 (2003-06) Fault Code: 427 PID: SID 231 SPN: 639 FMI: 9 J1939 Datalink - Abnormal Update Rate. Communication between the electronic control module (ECM) and another device on the SAE J1939 data link has been lost.

Cummins ISB CM850 (2003-06) Fault Code: 426 PID: SID 231 SPN: 639 FMI: 2 SAE J1939 data link - cannot transmit. Communication between the ECM and another device on the SAE J1939 data link has been lost.

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