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Home >> GMC >> 2002 >> Jimmy 2D Utility, Part Time, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 127 (Engine Controls - System & Component Testing) >> Fuel System (Diesel) >> Water-In-Fuel Light Always On (6.6L) >> Diagnostic Procedure

Diagnostic Procedure

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  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 6.6L SIERRA & SILVERADO article. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Start and idle engine. Observe message center in instrument cluster. Does message center indicate water-in-fuel? If yes, go to next step. If no, go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - TRUCKS article.
  3. Perform Water-In-Fuel Draining Procedure. See WATER-IN-FUEL DRAINING PROCEDURE (6.6L) . After performing procedure, go to next step.
  4. Start and idle engine. Observe message center in instrument cluster. Does message center indicate water-in-fuel? If yes, go to next step. If no, go to step  10.
  5. Disconnect water-in-fuel sensor. Does scan tool display Water-In-Fuel parameter is OFF? If yes, go to step  8. If no, go to next step.
  6. Turn OFF the ignition. Disconnect ECM. Probe Water-In-Fuel Indicator Control circuit with a test light connected to battery voltage. Does test light illuminate? If yes, go to next step. If no, go to step  9.
  7. Repair short to ground in Water-In-Fuel Indicator Control circuit. After repairs, go to step  10.
  8. Replace water-in-fuel sensor. After repairs, go to step  10.
  9. Replace ECM. Perform ECM relearn procedures. See PROGRAMMING in SELF-DIAGNOSTICS - 6.6L SIERRA & SILVERADO article. After repairs, go to next step.
  10. Operate system in order to verify repair. Did you correct the condition? If yes, system is okay. If no, go to step  3.
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