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Home >> Chevrolet >> 1999 >> Tracker 4D Utility, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Engine Testing >> Basic Fuel System Checks >> Fuel Pump Relay Circuit Diagnosis >> Diagnosis & Repair
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Diagnosis & Repair

  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. Turn ignition on with engine off. Remove fuel filler cap. Listen for fuel pump operation. Cycle ignition again if necessary. If fuel pump operates for about 3 seconds, go to next step. If fuel pump does not operate for about 3 seconds, go to step  4 .
  3. Remove fuel pump relay located in junction block, behind left kick panel. Using a test light connected to battery voltage, probe fuel pump relay control circuit (White/Green wire) at fuel pump relay connector cavity. See WIRING DIAGRAMS article. Observe test light while cranking engine. If test light illuminates, go to FUEL SYSTEM PRESSURE TEST  . If test light does not illuminate, go to step  17 .
  4. Turn ignition on with engine off. Remove fuel pump relay located in junction block, behind left kick panel. Using a test light connected to ground, probe main relay circuit (Blue/Black wire) at fuel pump relay connector cavity. See WIRING DIAGRAMS article. If test illuminates, go to next step. If test light does not illuminate, go to step  9 .
  5. Turn ignition off. Connect a fused jumper wire between main relay circuit (Blue/Black wire) and fuel pump circuit (Pink/Black wire) at fuel pump relay connector cavity. See WIRING DIAGRAMS article. Turn ignition on with engine off. Listen for fuel pump operation. Cycle ignition again if necessary. If fuel pump operates, go to step  12 . If fuel pump does not operate, go to next step.
  6. Leave fused jumper wire connected. Using a test light connected to ground, backprobe fuel pump circuit (Pink/Black wire) at fuel pump harness connector. See WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step  10 .
  7. Turn ignition off. Remove fused jumper wire. Disconnect fuel pump harness connector. Using a test light connected to battery voltage, probe fuel pump ground circuit (Black wire) at fuel pump harness connector. See WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step  11 .
  8. Replace fuel pump. After repairs, go to step  19 .
  9. Repair open or short in main relay circuit (Blue/Black wire) between fuel pump relay and main relay. After repairs, go to step  19 .
  10. Repair open or short in fuel pump circuit (Pink/Black wire) between fuel pump relay and fuel pump. After repairs, go to step  19 .
  11. Repair poor connection or open in fuel pump ground circuit (Black wire). After repairs, go to step  19 .
  12. Turn ignition off. Remove fused jumper wire. Turn ignition on with engine off. Using a test light connected to ground, probe IG fuse circuit (Black/White wire) at fuel pump relay connector cavity. See WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step  15 .
  13. Using a test light connected to battery voltage, probe fuel pump relay control circuit (White/Green wire) at fuel pump relay connector cavity. See WIRING DIAGRAMS article. Observe test light while cranking engine. If test light illuminates, go to step  16 . If test light does not illuminate, go to next step.
  14. Using a test light connected to battery voltage, backprobe fuel pump relay control circuit (White/Green wire) at PCM harness connector. See WIRING DIAGRAMS article. Observe test light while cranking engine. If test light illuminates, go to step  17 . If test light does not illuminate, go to step  18 .
  15. Repair open or short in IG fuse circuit (Black/White wire) between junction block and fuel pump relay. After repairs, go to step  19 .
  16. Replace fuel pump relay. After repairs, go to step  19 .
  17. Check for an open in fuel pump relay control circuit (White/Green wire) between PCM and fuel pump relay. Repair as necessary. After repairs, go to step  19 . If circuit is okay, go to next step.
  18. Replace PCM. After repairs, go to next step.
  19. Operate vehicle under conditions which original symptom was noted. If system operates properly, system is okay. If system does not operate properly, check for an intermittent condition which may be caused by poor connection, rubbed-through insulation, or a broken wire inside insulation. Check harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, or poor terminal-to-wire connections before component replacement. Check for a restricted or leaking fuel feed pipe or hose. Repair as necessary.
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