Circuit/System Description

If there is water in the fuel system, the water in fuel sensor/switch will close and produce a low voltage on the signal circuit. When the engine control module (ECM) detects a low signal voltage from the water in fuel sensor, the ECM will send a serial data message to the instrument panel cluster (IPC). The IPC displays the WATER IN FUEL SERVICE REQUIRED message in the driver information center (DIC) when the IPC receives a serial data message from the ECM.