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Home >> Chevrolet >> 1999 >> Metro Base, 2D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> No Start Diagnosis >> No Start-Engine Cranks Okay (1.0L) >> Fuel System Electrical Circuit

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. Remove fuel filler cap. Turn ignition on with engine off. Listen for operation of fuel pump at fuel filler pipe. Repeat ignition cycle as necessary. Fuel pump should operate for about 2 seconds. If fuel pump operates as specified, go to next step. If fuel pump does not operate, go to step  4.
  3. Remove fuel pump relay. Using a test light connected to battery positive, probe fuel pump relay control circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Crank engine. If test light illuminates, diagnose fuel system. See BASIC FUEL SYSTEM CHECKS . If test light does not illuminate, go to step  18.
  4. Turn ignition on with engine off. Remove fuel pump relay. Using a test light connected to ground, probe main relay 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  9.
  5. Turn ignition off. Connect a fused jumper wire between fuel pump power supply circuit and main relay circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Turn ignition on with engine off. Listen for operation of fuel pump. Repeat ignition cycle as necessary. If fuel pump operates, go to step  12. If fuel pump does not operate, go to next step.
  6. Leave jumper wire connected. Using a test light connected to ground, backprobe power supply circuit at fuel pump harness 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  10.
  7. Turn ignition off. Remove jumper wire. Disconnect fuel pump harness connector. Using a test light connected to battery positive, probe ground circuit at fuel pump harness 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  11.
  8. Replace fuel pump. After repairs, go to step  19.
  9. Repair open or short in main relay circuit between fuel pump relay and main relay. After repairs, go to step  19.
  10. Repair open or short in fuel pump power supply circuit between fuel pump and fuel pump relay. After repairs, go to step  19.
  11. Repair open or poor connection in fuel pump ground circuit between fuel pump and ground connection. After repairs, go to step  19.
  12. Turn ignition off. Remove jumper wire. Turn ignition on with engine off. Using a test light connected to ground, probe IG-COIL fuse 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.
  13. Using a test light connected to battery positive, probe fuel pump relay control circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Crank 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 positive, backprobe fuel pump relay control circuit at PCM harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Crank 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-COIL fuse circuit between fuel pump relay and junction block. After repairs, go to step  19.
  16. Replace fuel pump relay. After repairs, go to step  19.
  17. Repair open in fuel pump relay control circuit between fuel pump relay and PCM. After repairs, go to step  19.
  18. Replace PCM. After repairs, go to next step.
  19. Operate vehicle under conditions in which problem originally occurred. If problem no longer exists, system is okay. If problem still exists, go to DIAGNOSTIC AIDS .
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