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Home >> Chevrolet >> 2014 >> Express 1500 LS, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Water in Fuel Indicator Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the water in fuel sensor.
  2. Ignition OFF, test for less than 1 Ω between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, observe the Water In Fuel Sensor parameter. The parameter should display No Water.
    • If parameter does not display No Water, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. The Water In Fuel Sensor parameter should display Water.
    • If a 3 A fuse opens and the Water In Fuel Sensor parameter displays No Water, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
    • If the Water In Fuel Sensor parameter displays No Water and the 3 A fuse did not open, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, replace the fuel strainer bowl.
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