Water-in-Fuel Lamp Inoperative

Water-in-Fuel Lamp Inoperative

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

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 from the water in fuel sensor the ECM will send a serial data message to the instrument panel cluster (IPC). The IPC will then illuminate the WATER IN FUEL SERVICE REQUIRED indicator in the driver information center (DIC).

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the water in fuel sensor.
2. Ignition OFF, test for less than 1 ohm between the ground circuit terminal B and ground.

^ If greater than 1 ohm, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Install a 3-amp fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Water In Fuel Sensor parameter is Water.

^ If not Water, test the signal circuit of the water in fuel sensor for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

4. If all circuits test normal, test or replace the water in fuel sensor

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Water in Fuel Indicator Sensor Replacement