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Water-in-Fuel Indicator Sensor Circuit – Voltage Above Normal or Shorted to High Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 428 PID: P097 SPN: 97 FMI: 3/3 LAMP: Amber SRT: |
Water-in-Fuel Indicator Sensor Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at the water-in-fuel circuit. |
None on performance. No water-in-fuel warning available. |
 Water-in-Fuel Sensor Circuit
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Circuit Description
The water-in-fuel sensor is attached to the fuel filter. The water-in-fuel sensor sends a signal to the ECM when a set volume of water has accumulated in the fuel filter. The water-in-fuel circuit contains two wires: A return ground and a SIGNAL wire.
Component Location
The water-in-fuel sensor is integrated into the bottom of the OEM supplied suction fuel filter. The OEM supplied fuel filter is located on the intake side of the engine. For marine applications, the water-in-fuel sensor is mounted in a filter housing which contains a serviceable element. The filter housing location will vary with each OEM.
Shop Talk
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 for this fault code include:
- Open RETURN or SIGNAL circuit in the harness, connectors, or sensor.
- SIGNAL wire shorted to sensor supply or battery voltage.
Refer to Troubleshooting Fault Code t05-428
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