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Home >> GMC >> 2002 >> Jimmy 2D Utility, Part Time, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 127 (Engine Controls - System & Component Testing) >> Fuel System (Diesel) >> Water-In-Fuel Light Always On (6.5L) >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 6.5L CAB & CHASSIS, CHEVY EXPRESS & SAVANA article. After performing Diagnostic System Check - Engine Controls, go to next step.
    2. NOTE: Before proceeding with this step, drain any water from fuel system.
  2. Turn ON the ignition, with the engine OFF. Does water-in-fuel light illuminate briefly, then go out? If yes, go to step  4. If no, go to next step.
  3. Does water-in-fuel light stay ON? If yes, go to step  5. If no, go to.WATER-IN-FUEL LIGHT INOPERATIVE (6.5L) 
  4. Operate vehicle under conditions which problem was noted. Does system operate normally? If yes, system is okay. If no, go to step  2.
  5. Disconnect water-in-fuel sensor harness connector. Turn ON the ignition, with the engine OFF. Probe Water-In-Fuel Indicator Control circuit at harness connector with Test Light (J 34142-B) connected to battery voltage. Does test light illuminate? If yes, go to next step. If no, go to step  7.
  6. Repair short to ground in Water-In-Fuel Indicator Control circuit. After repairs, go to step  8.
  7. Replace water-in-fuel sensor. After repairs, go to next step.
  8. Start engine. Operate vehicle within conditions under which problem was noted. Does system operate normally? If yes, system is okay. If no, go to step  2.
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