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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Engine Control System - Basic Diagnostic Procedures) >> No-Start Diagnosis >> No Start - Engine Cranks Okay (5.7L) >> Fuel Pump Electrical Circuit ("F" Body)

Fuel Pump Electrical Circuit ("F" Body)

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  1. If diagnostic system check has already been performed, go to next step. If diagnostic system check has not been performed, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in appropriate SELF-DIAGNOSTICS article.
  2. Connect scan tool. Turn ignition on. Using scan tool, command fuel pump relay on and off. If fuel pump turns on and off, check for intermittent problem. See appropriate TROUBLE SHOOTING - NO CODES article. If fuel pump does not turn on and off, go to next step.
  3. Using scan tool, command fuel pump relay on and off. If fuel pump relay clicks, go to step  9. If fuel pump relay does not click, go to next step.
  4. Turn ignition off. Disconnect fuel pump relay located in underhood fuse block. Turn ignition on. Using test light connected to ground, probe fuel pump relay control circuit at relay cavity. Using scan tool, command fuel pump relay on and off. If test light turns on and off, go to next step. If test light does not turn on and off, go to step  6.
  5. Connect test light between fuel pump relay control circuit and fuel pump relay ground circuit at relay cavities. Using scan tool, command fuel pump relay on and off. If test light turns on and off, go to step  21. If test light does not turn on and off, go to step  24.
  6. If test light remains illuminated for each command, go to next step. If test light does not illuminate at all, go to step  8.
  7. Disconnect PCM. Check fuel pump relay control circuit for short to voltage. Repair as necessary. After repairs, go to step  29. If circuit is okay, go to step  28.
  8. Disconnect PCM. Check fuel pump relay control circuit for open or short to ground. Repair as necessary. After repairs, go to step  29. If circuit is okay, go to step  22.
  9. Turn ignition on. If fuel pump runs continuously, go to next step. If fuel pump does not run continuously, go to step  11.
  10. Turn ignition off. Disconnect fuel pump relay located in underhood fuse block. Turn ignition on. If fuel pump runs continuously, go to step  23. If fuel pump does not run continuously, go to step  27.
  11. Check FUEL PUMP fuse (20-amp) located in underhood junction block. If fuse is open, go to next step. If fuse is okay, go to step  14.
  12. Disconnect fuel pump jumper harness from body pass-through connector. Check for short to ground in fuel pump power feed circuit between fuel pump relay and body pass-through connector. Repair as necessary. After repairs, go to step  29. If circuit is okay, go to next step.
  13. Lower fuel tank. Check fuel pump jumper harness for damage or grounded circuits. Repair as necessary. After repairs, go to step  29. If jumper harness is okay, go to step  20.
  14. Turn ignition off. Disconnect fuel pump relay located in underhood fuse block. Turn ignition on. Using test light connected to ground, probe fuel pump relay battery feed circuit at relay cavity. If test light illuminates, go to next step. If test light does not illuminate, go to step  25.
  15. Connect fused jumper wire between fuel pump relay battery feed circuit and fuel pump power feed circuit at relay cavities. If fuel pump runs, go to step  21. If fuel pump does not run, go to next step.
  16. Disconnect fuel pump jumper harness from body pass-through connector. Check for open or high resistance in fuel pump power feed circuit between fuel pump relay and body pass-through connector. Repair as necessary. After repairs, go to step  29. If circuit is okay, go to next step.
  17. Check fuel pump ground circuit for open or high resistance between body pass-through connector and chassis ground. Repair as necessary. After repairs, go to step  29. If circuit is okay, go to next step.
  18. Check fuel pump jumper harness for poor connections at body pass-through connector. Repair as necessary. After repairs, go to step  29. If connections are okay, go to next step.
  19. Lower fuel tank. Check fuel pump jumper harness for damage, open circuits and poor connections. Repair as necessary. After repairs, go to step  29. If jumper harness is okay, go to step  26.
  20. Reconnect and install all components. Install NEW fuel pump fuse. Using scan tool, command fuel pump relay on. If fuse blows, go to step  26. If fuse does not blow, check for intermittent problem. See appropriate TROUBLE SHOOTING - NO CODES article.
  21. Check for poor connections at fuel pump relay. Repair as necessary. After repairs, go to step  29. If connections are okay, go to step  27.
  22. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  29. If connections are okay, go to step  28.
  23. Repair short to voltage in fuel pump power feed circuit. After repairs, go to step  29.
  24. Repair open in fuel pump relay ground circuit. After repairs, go to step  29.
  25. Repair open in fuel pump relay battery feed circuit. After repairs, go to step  29.
  26. Replace fuel pump. After repairs, go to step  29.
  27. Replace fuel pump relay. After repairs, go to step  29.
  28. Replace PCM. Perform PCM relearn procedure. After repairs, go to next step.
  29. Operate system to verify repair. If system operation is okay, testing is complete. If system operation is not okay, go to step  2.
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