Water-In-Fuel Sensor

PURPOSE
The Powertrain Control Module (PCM) turns the water-in-fuel indicator lamp to the ON position if water is detected in the fuel.

Water-In-Fuel Sensor:

LOCATION
The water-in-fuel (WIF) sensor is located at the bottom of the fuel filter/water separator.

DESCRIPTION
The sensor sends an input to the Powertrain Control Module (PCM) when it senses water in the fuel filter/water separator.

Warning Lamp Location:

OPERATION

The lamp will illuminate for about two seconds each time the ignition key is turned ON as a bulb check.

As the water level in the filter/separator increases, the resistance across the WIF sensor decreases. This decrease in resistance is sent as a signal to the PCM and compared to a high water standard value. Once the value reaches 30,000 to 40,000 ohms, the PCM will activate the instrument panel mounted, water-in-fuel warning lamp. This all takes place when the ignition key is initially put in the ON position. The PCM continues to monitor the input at the end of the intake manifold air heater post-heat cycle.

Also refer to Water-In-Fuel Sensor-PCM Pin #1 -PCM Input for additional information. Water-In-Fuel Sensor