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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1297 (Instrument Panel System Displays & Gauges) >> Diagnostic Information and Procedures >> Water in Fuel Indicator Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the water in fuel sensor.
  2. Ignition OFF, test for less than 1 ohm 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 3A 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 3A 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 3A 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, test or replace the water in fuel sensor.
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