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Home >> Chevrolet >> 2000 >> Tracker 4D Utility, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> Basic Fuel System Checks >> Fuel Pump Relay Circuit Diagnosis >> Diagnostic Procedure
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Diagnostic Procedure

  1. Perform 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. Remove fuel filler cap. Turn ignition on. Listen for fuel pump operation. Cycle ignition again if necessary. If fuel pump operates for about 2 seconds, go to next step. If fuel pump does not operate for about 2 seconds, go to step  4 .
  3. Fuel pump electrical circuit is okay at this time. Check for intermittent problem. See appropriate TROUBLE SHOOTING - NO CODES article.
  4. If fuel pump runs continuously with ignition on and engine off, go to step  17 . If fuel pump does not run continuously with ignition on and engine off, go to next step.
  5. Turn ignition off. Remove fuel pump relay. Using test light connected to battery positive, probe fuel pump relay control circuit at relay cavity. Using scan tool, command fuel pump on. If test light illuminates, go to next step. If test light does not illuminate, go to step  16 .
  6. Using test light connected to ground, probe fuel pump relay battery feed circuit (from main relay) at fuel pump relay cavity. Turn ignition on. If test light illuminates, go to next step. If test light does not illuminate, go to step  11 .
  7. Turn ignition off. Connect fused jumper wire between fuel pump relay battery feed circuit (from main relay) and fuel pump relay load circuit (to fuel pump) at fuel pump relay cavities. Turn ignition on. If fuel pump runs, go to step  14 . If fuel pump does not run, go to next step.
  8. Leave jumper wire connected. Using test light connected to ground, backprobe fuel pump power feed circuit at fuel pump harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  12 .
  9. Turn ignition off. Remove jumper wire. Disconnect fuel pump harness connector. Using test light connected to battery positive, probe fuel pump ground circuit at fuel pump harness connector (harness side). If test light illuminates, go to next step. If test light does not illuminate, go to step  13 .
  10. Remove fuel tank. Check fuel pump wire harness for damage. Remove fuel pump assembly. Check electrical connections and internal wire harness for damage. Repair as necessary. After repairs, go to step  24 . If no problem is found, go to step  22 .
  11. Check for open in battery feed circuit between main relay and fuel pump relay. Repair as necessary. After repairs, go to step  24 . If circuit is okay, see MAIN RELAY CIRCUIT DIAGNOSIS  .
  12. Repair open or high resistance in fuel pump power feed circuit between fuel pump relay and fuel pump harness connector. After repairs, go to step  24 .
  13. Repair open or poor connection in fuel pump ground circuit. After repairs, go to step  24 .
  14. Turn ignition off. Remove jumper wire. Turn ignition on. Using test light connected to ground, probe fuel pump relay ignition feed circuit (from IG fuse) at fuel pump relay cavity. If test light illuminates, go to step  21 . If test light does not illuminate, go to next step.
  15. Repair open or short in fuel pump relay ignition feed circuit. After repairs, go to step  24 .
  16. Check for open in fuel pump relay control circuit between fuel pump relay and PCM. Repair as necessary. After repairs, go to step  24 . If circuit is okay, go to step  23 .
  17. Remove fuel pump relay. If fuel pump continues to run, go to next step. If fuel pump stops, go to step  19 .
  18. Repair short to voltage in fuel pump power feed circuit. After repairs, go to step  24 .
  19. Turn ignition off. Remove fuel pump relay. Using test light connected to battery positive, probe fuel pump relay control circuit at relay cavity. Turn ignition on and observe test light for 10 seconds. If test light remains illuminated for more than 3 seconds, go to next step. If test light does not remain illuminated for more than 3 seconds, go to step  21 .
  20. Check for short to ground in fuel pump relay control circuit between fuel pump relay and PCM. Repair as necessary. After repairs, go to step  24 . If circuit is okay, go to step  23 .
  21. Replace fuel pump relay. After repairs, go to step  24 .
  22. Replace fuel pump. After repairs, go to step  24 .
  23. Replace PCM. Perform PCM relearn procedures. After repairs, go to next step.
  24. Operate vehicle under conditions which original symptom was noted. If system operates properly, system is okay. If system does not operate properly, see DIAGNOSTIC AIDS  .
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