Cummins ISB CM850 (2003-06) Fault Code: 418 (Marine) PID: 97 SPN: 97 FMI: 15 Water-in-Fuel Indicator Data Valid but Above Normal Operational Range – Least Severe Level. Water has been detected in the fuel filter. In automotive, industrial, and power generation applications, 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)Water in fuel2)Damaged sensor3)Fuel contamination. Possible repairs: 1)Flush the dirt, debris, or moisture from the connector pins.2)Replace the water-in-fuel sensor.3)The...

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. This fault occurs whenever the ECM starts communicating with any other device using the SAE J1939 data link and then can no longer transmit on the data link. Possible causes could be the following: Unplugging an electronic service tool before keying off the ECM, the SAE J1939 data link having an intermittent electrical problem, and the ECM (or another SAE J1939 device) tying...

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. This fault occurs whenever the ECM has been receiving SAE J1939 datalink commands from an external OEM device and is no longer receiving the datalink commands. Possible causes: 1)Electrical problems with the SAE J1939 data link wiring such as grounded, shorted, or open circuits2)The ECM (or another SAE J1939 device) tying up communications by sending too many consecutive messages3)The external OEM...

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. 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)Open RETURN or SIGNAL circuit in the harness, connectors, or sensor.2)SIGNAL wire shorted to sensor supply or battery voltage. Possible repairs: 1)Replace the water-in-fuel sensor.2)Repair or replace the...

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. In automotive, industrial, and power generation applications, 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)Water in fuel2)Damaged sensor3)Fuel contamination. Possible repairs: 1)Install the appropriate connector seal if it is damaged or missing.2)Replace the water-in-fuel sensor.3)Replace...