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Home >> Pontiac >> 2002 >> Aztek FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel System (Diesel) >> Water-In-Fuel Light Inoperative (6.5L) >> Diagnostic Procedure
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Diagnostic Procedure

  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. Turn ON the ignition, with the engine OFF. Does water-in-fuel light come ON briefly? If yes, go to step  6. If no, go to next step.
  3. Disconnect water-in-fuel sensor. With Test Light (J 34142-B) connected to ground, probe terminal "A" (Pink wire). Verify ignition is ON, with the engine OFF. Does test light illuminate? If yes, go to next step. If no, go to step  7.
  4. With Test Light (J 34142-B), jumper harness terminals "A" (Pink wire) and "C" (Black wire) with ignition still ON. Does test light illuminate? If yes, go to next step. If no, go to step  9.
  5. With Test Light (J 34142-B) connected to ground, probe terminal "B" (Yellow/Black wire) of harness connector. Does test light illuminate? If yes, go to step  8. If no, go to step  10.
  6. Operate vehicle under which system was noted. Does system operate properly? If yes, system is okay. If no, go to step  2.
  7. Check Ignition Feed circuit for an open. If a problem is found, repair as necessary. After repairs, go to step  12.
  8. Check for a poor feed connection at sensor. If a problem is found, repair as necessary. Did you find and correct the condition? If yes, go to step  12. if no, go to step  11.
  9. Check Ground circuit for an open. If a problem is found, repair as necessary. After repairs, go to step  12.
  10. Repair open in Light circuit. After repairs, go to step  12.
  11. Replace water-in-fuel sensor. After repairs, go to step  12.
  12. Operate vehicle under condition which original problem was noted. Does system operate properly? If yes, system is okay. If no, go to step  2.
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