Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 429

Water-In-Fuel (WIF) Sensor Circuit


Fault Code: 429
PID: P097
SPN: 97
FMI: 4/4
LAMP: Yellow

Low voltage detected at water-in-fuel (WIF) sensor circuit.

None on performance.

Water-In-Fuel (WIF) Sensor Circuit

Circuit Description

The water-in-fuel sensor is attached to the 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 ground (pin 10) and a signal wire (pin 9).

Component Location

The water-in-fuel sensor is installed in the fuel filter and is located on the side of the head approximately midengine.

Shop Talk

The water-in-fuel sensor uses the same internal ECM power supply as sensors on engine harness. If Fault Code 352 is also active, use that troubleshooting logic and tree.

Refer to Troubleshooting Fault Code t05-429.

Last Modified:  26-Oct-2010