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Fuel System Electrical Circuit

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
  2. Install scan tool. Turn ignition on. Using scan tool, command fuel pump relay on and off while observing scan tool display. If scan tool display reads ON and OFF as commanded, go to next step. If scan tool display is not as specified, go to step  9 .
  3. Inspect fuses V3 and No. 18. If a fuse is faulty, go to step  13 . If fuses are okay, go to next step.
  4. Turn ignition off. Remove fuel pump relay. Using a fused jumper wire, connect fuel pump relay battery feed circuit and fuel pump feed circuit together at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Turn ignition on. If fuel pump operates for about 2 seconds, go to step  14 . If fuel pump does not run, go to next step.
  5. Using a test light connected to ground, probe fuel pump relay battery feed circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step  15 .
  6. Using a test light connected to battery positive, probe fuel pump feed circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step  16 .
  7. Turn ignition off. Raise and support vehicle. Disconnect fuel pump harness connector. Turn ignition on. Using a test light connected to battery positive, probe fuel pump feed circuit at fuel pump relay connector. If test light illuminates, go to step  17 . If test light does not illuminate, go to next step.
  8. Using a test light connected to battery positive, probe ground circuit at fuel pump harness connector (vehicle harness side). If test light illuminates, go to step  18 . If test light does not illuminate, go to step  19 .
  9. Disconnect ECM harness connector. Remove fuel pump relay. Using a test light connected to battery positive, probe fuel pump relay control circuit at fuel pump relay connector. If test light illuminates, go to step  20 . If test light does not illuminate, go to next step.
  10. Using DVOM, check for continuity in fuel pump relay control circuit between fuel pump relay and ECM. If continuity is present, go to next step. If continuity is not present, go to step  21 .
  11. Disconnect fuel pump relay. Using test light connected to ground, probe fuel pump relay ignition feed circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. Turn ignition on. If test light illuminates, go to step  22 . If test light does not illuminate, go to next step.
  12. Check engine control power relay feed circuit for an open or short to ground. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step  24 . If circuit is okay, go to POWER RELAY CIRCUIT (CATERA)  under ENGINE CONTROLS CIRCUIT CHECKS.
  13. Inspect circuit related to faulty fuse. Repair as necessary. Replace fuse and go to step  24 .
  14. Replace fuel pump relay. Go to step  24 .
  15. Repair open in battery positive circuit. Go to step  24 .
  16. Repair open in fuel pump power feed circuit from fuel pump relay. Go to step  24 .
  17. Repair short to ground in fuel pump power feed circuit. Go to step  24 .
  18. Replace fuel pump. Go to step  24 .
  19. Repair open in fuel pump ground circuit. Go to step  24 .
  20. Repair short to ground in fuel pump relay control circuit. Go to step  24 .
  21. Repair open in fuel pump relay control circuit. Go to step  24 .
  22. Check for poor connections at ECM. Repair as necessary. After repairs, go to step  24 . If connections are okay, go to next step.
  23. Turn ignition off. Replace PCM. Perform PCM relearn procedures. After replacing PCM, go to next step.
  24. Using scan tool, clear DTCs. Attempt to start engine. If engine starts and continues to run, go to next step. If engine does not start, or starts and stalls, go to step  2 .
  25. Allow engine to reach normal operating temperature. Check for DTCs. If DTCs are present, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If DTCs are not present, go to next step.
  26. If any additional DTCs were noted during powertrain OBD system check that have not been diagnosed, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If no other DTCs are present, system is okay.
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