Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 428

Water-In-Fuel (WIF) Sensor Circuit


Fault Code: 428
PID: P097
SPN: 97
FMI: 3/3
LAMP: Yellow

High 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 contain 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

Possible causes for this fault code include:Short circuit to a (+) 5-VDC supply wire.

Refer to Troubleshooting Fault Code t05-428.

Last Modified:  26-Oct-2010