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Home >> Chevrolet >> 2003 >> Venture Base, Van Cargo Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Engine Component Tests >> Fuel Systems >> Fuel Injector Circuit Diagnosis >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 3.4L MONTANA, SILHOUETTE & VENTURE article. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Are any fuel injector DTCs set? If yes, go to DTC P0200-P0206: FUEL INJECTOR CONTROL CIRCUITS in SELF-DIAGNOSTICS - 3.4L MONTANA, SILHOUETTE & VENTURE article. If no, go to next step.
  3. Inspect fuel injector fuse. Is fuel injector fuse open? If yes, go to next step. If no, go to step  6 .
  4. Turn ignition off. Disconnect the multi-way harness connector of the fuel injectors. Using a test light connected to battery voltage, probe the fuse side of the ignition 1 voltage circuit. Does the test light illuminate? If yes, go to step  9 . If no, go to next step.
  5. Turn ignition on, with engine off. Does test light illuminate? If yes, go to step  13 . If no, go to step  8 .
  6. Turn ignition off. Disconnect the multi-way harness connector of the fuel injectors. Turn ignition on, with engine off. Using a test light connected to ground, probe the fuse side of the ignition 1 voltage circuit of the fuel injector. Does the test light illuminate? If yes, go to next step. If no, go to step  10 .
  7. Using a DVOM, test for continuity between the ignition voltage terminal and a fuel injector terminal, at the multi-way harness connector, fuel injector side. Is resistance greater than 5 ohms? If yes, go to step  11 . If no, go to step  12 .
  8. Test the ignition 1 voltage circuit of the fuel injector, between the multi-way harness connector and the fuel injectors for a short to ground. Did you find and correct the condition? If yes, go to step  14 . If no, problem is intermittent.
  9. Repair short to ground in the ignition voltage circuit of the fuel injector. After repairs, go to step  14 .
  10. Repair open in the ignition 1 voltage between UBEC and the multi-way connector. After repairs, go to step  14 .
  11. Repair ignition 1 voltage circuit of the fuel injectors for an open and/or high resistance, between the multi-way connector and the splice. After repairs, go to step  14 .
  12. Repair poor connection at the multi-way connector. After repairs, go to step  14 .
  13. Repair short to a PCM ground in the ignition voltage circuit of the fuel injector. After repairs, go to next step.
  14. Operate the 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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