Water-In-Fuel Sensor Circuit – Voltage Below Normal or Shorted to Low Source
|Fault Code: 429
Water-in-Fuel Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the water-in-fuel circuit.
None on performance. No water-in-fuel warning available.
Water-In-Fuel Sensor Circuit
The water-in-fuel sensor is attached to the suction-side fuel filter. The water-in-fuel sensor sends a signal to the Electronic Control Module (ECM) when a set volume of water has accumulated in the fuel filter. The water-in-fuel circuit contains two wires: a return and a signal wire.
The water-in-fuel sensor is integrated into the bottom of the Original Equipment Manufacturer (OEM) supplied fuel filter. Refer to the OEM troubleshooting and repair manual for location.
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 for this fault code include:
- Signal circuit shorted to ground in the harness, sensor, connector or ECM