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Home >> Pontiac >> 2002 >> Aztek AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel System (Gasoline) >> Fuel Pump Relay (3.4L) >> Diagnostic Procedure

Diagnostic Procedure

  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 3.4L AZTEK & RENDEZVOUS or SELF-DIAGNOSTICS - 3.4L MONTANA, SILHOUETTE & VENTURE article. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Install scan tool. Turn ON the ignition, with the engine OFF. With scan tool, command fuel pump relay ON and OFF. Does fuel pump turn ON and OFF? If yes, go to DIAGNOSTIC AIDS . If no, go to next step.
  3. With scan tool, command fuel pump relay ON and OFF. Do you hear a click when you command fuel pump relay ON and OFF? If yes, go to step  9. If no, go to next step.
  4. Turn OFF the ignition. Disconnect fuel pump relay. Turn ON the ignition, with the engine OFF. Probe Control circuit of fuel pump relay with a test light that is connected to a good ground. With scan tool, command fuel pump ON and OFF. Does test light turn ON and OFF? If yes, go to next step. If no, go to step  6.
  5. Connect test light between Control circuit of fuel pump relay and ground circuit of fuel pump relay. With scan tool, command fuel pump ON and OFF. Does test light turn ON and OFF? If yes, go to step  21. If no, go to step  24.
  6. Does test light remain illuminated with each command? If yes, go to next step. If no, go to step  8.
  7. Test Control circuit of fuel pump relay for a short to voltage. Did you find and correct the condition? If yes, go to step  29. If no, go to step  28.
  8. Test Control circuit of fuel pump relay for a short to ground or an open. Did you find and correct the condition? If yes, go to step  29. If no, go to step  22.
  9. Turn ON the ignition, with the engine OFF. Does fuel pump operate continuously? If yes, go to next step. If no, go to step  11.
  10. Turn OFF the ignition. Disconnect fuel pump relay. Turn ON the ignition, with the engine OFF. Does fuel pump operate continuously? If yes, go to step  23. If no, go to step  27.
  11. Is fuel pump fuse open? If yes, go to next step. If no, go to step  14.
  12. Disconnect fuel pump harness in-line connector located near fuel tank. Test fuel pump supply voltage circuit for a short to ground. Replace fuel pump fuse if necessary. Did you find and correct the condition? If yes, go to step  29. If no, go to next step.
  13. Lower fuel tank if necessary. Test or inspect fuel tank electrical harness for damage to harness or a grounded circuit. Replace fuel pump fuse if necessary. Did you find and correct the condition? If yes, go to step  29. If no, go to step  20.
  14. Turn OFF the ignition. Disconnect fuel pump relay. Turn ON the ignition, with the engine OFF. Probe battery positive voltage circuit of fuel pump relay with a test light connected to a good ground. Does test light illuminate? If yes, go to next step. If no, go to step  25.
  15. Connect a 10-amp fused jumper wire between battery positive voltage circuit and fuel pump supply voltage circuit in fuel pump cavity. Does fuel pump operate? If yes, go to step  21. If no, go to next step.
  16. Disconnect fuel pump harness in-line connector located near fuel tank. Test fuel pump supply voltage circuit for an open or high resistance between fuel pump relay and in-line connector. Did you find and correct the condition? If yes, go to step  29. If no, go to next step.
    17. NOTE: Inspect ground circuit for being tight, corrosion on terminals, or damage to wiring harness.
  17. Test ground circuit of fuel pump for an open or high resistance between body pass through connector and ground. Did you find and correct the condition? If yes, go to step  29. If no, go to next step.
  18. Inspect for poor connections at fuel pump in-line connector to body pass through connector. Did you find and correct the condition? If yes, go to step  29. If no, go to next step.
  19. Lower fuel tank. Test or inspect fuel tank electrical harness for damage to harness or an open circuit. Did you find and correct the condition? If yes, go to step  29. If no, go to step  26.
  20. Connect all disconnected components. Install a NEW fuel pump fuse. With scan tool, command fuel pump ON. Is fuel pump fuse open? If yes, go to step  26. If no, go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - TRUCKS article.
  21. Inspect for poor connections at fuel pump relay. Did you find and correct the condition? If yes, go to step  29. If no, go to step  27.
  22. Inspect for poor connections at harness of PCM. Did you find and correct the condition? If yes, go to step  29. If no, go to step  28.
  23. Repair fuel pump supply voltage circuit for a short to voltage. After repairs, go to step  29
  24. Repair fuel pump relay ground circuit for an open ground. After repairs, go to step  29
  25. Repair battery positive voltage circuit of fuel pump relay for an open. After repairs, go to step  29
    26. NOTE: Inspect for poor connections at fuel pump, within fuel tank, before replacing fuel pump.
  26. Replace fuel pump. Replace fuel pump fuse, if necessary. After repairs, go to step  29.
    27. NOTE: Before replacing fuel pump relay, inspect fuel pump prime circuit for a short to voltage.
  27. Replace fuel pump relay. After repairs, go to step  29
  28. Replace PCM. Perform PCM relearn procedures. See PROGRAMMING in SELF-DIAGNOSTICS - 3.4L AZTEK & RENDEZVOUS or SELF-DIAGNOSTICS - 3.4L MONTANA, SILHOUETTE & VENTURE article. After repairs, go to step  29
  29. Operate system in order to verify repair. Did you correct the condition? If yes, system is okay. If no, go to step  2.
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