The WIF sensor uses two electrical contacts exposed to the fuel supply. When water is present in the fuel
supply, the circuit between the contacts is closed. This allows a 5 V signal at ECM Pin X2–9. When water is not present, the circuit is open and ECM Pin X2–9 will be 0 V.
Fault Detection / Management
The ECM continuously monitors the WIF circuit for in-range faults. The ECM does not detect open or short circuits in the WIF circuit. When the ECM detects an in-range fault, DTC 153 will be set.
WIF Diagnostic Trouble Codes (DTCs)
DTCs are read using the Electronic Service Tool (EST) or by counting the flashes from the amber and red ENGINE lamp.
WIF signal out-of-range high
• DTC 153 is set when the ECM detects an in-range voltage at or above 4.5 V at ECM Pin X2–9.
• DTC 153 is set when the WIF signal circuit is shorted to V REF or VBAT.
• When DTC 153 is active, the FUEL FILTER lamp is not illuminated.
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• Breakout Box