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HOMESERVICE MANUALSCHEVROLET1999SUBURBAN K1500, 5.7 R, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC DIAGNOSTIC PROCEDURESNO START DIAGNOSISNO START-ENGINE CRANKS OKAY (4.8L, 5.3L & 6.0L)FUEL SYSTEM ELECTRICAL CIRCUIT
1999 Chevrolet Suburban K1500, 5.7 R, Automatic

Fuel System Electrical Circuit

1999 Chevrolet Suburban K1500, 5.7 R, AutomaticSECTION 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. Check ECM B fuse (20-amp), located in underhood electrical center. If fuse is open, go to step  9. If fuse is okay, go to next step.
  3. Remove fuel pump relay from underhood electrical center. Turn ignition on with engine off. 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  12.
  4. Using a test light connected to battery positive, probe fuel pump relay ground 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  13.
  5. Install scan tool. Using a test light connected to ground, probe fuel pump relay control circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Using scan tool, command fuel pump on. If test light illuminates, go to next step. If test light does not illuminate, go to step  11.
  6. Turn ignition on. Using a fused jumper wire, jumper fuel pump relay battery feed circuit and fuel pump load circuit together at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If fuel pump operates, go to step  18. If fuel pump does not operate, leave jumper wire connected and go to next step.
  7. Disconnect fuel pump harness connector at fuel pump. Using a test light connected to ground, probe power feed circuit at fuel pump harness connector (body harness side). See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, leave jumper wire connected and go to next step. If test light does not illuminate, go to step  14.
  8. Connect test light between battery feed circuit and ground circuit at fuel pump harness connector (body harness side). See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step  25. If test light does not illuminate, go to step  15.
  9. Turn ignition off. Remove ECM B fuse (20-amp) from underhood electrical center. Disconnect fuel pump harness connector at fuel pump. Using a test light connected to battery positive, probe fuel pump relay load circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step  16. If test light does not illuminate, go to next step.
  10. Using a test light connected to battery positive, 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 step  20. If test light does not illuminate, go to step  21.
  11. Turn ignition off. Disconnect PCM harness connector C2 (Red). See appropriate wiring diagram in WIRING DIAGRAMS article. Using DVOM, measure resistance of fuel pump relay control circuit between PCM and underhood electrical center. If resistance is 5 ohms or less, go to step  22. If resistance is not as specified, go to step  17.
  12. Repair open or short to ground in fuel pump relay battery feed circuit. Replace ECM B fuse if necessary. After repairs, go to step  26.
  13. Repair open in fuel pump relay ground circuit. After repairs, go to step  26.
  14. Repair open in circuit between fuel pump and fuel pump relay. After repairs, go to step  26.
  15. Repair open in fuel pump ground circuit. After repairs, go to step  26.
  16. Repair short to ground in fuel pump relay load circuit between fuel pump and fuel pump relay. After repairs, go to step  26.
  17. Repair open in fuel pump relay control circuit. After repairs, go to step  26.
  18. Check fuel pump relay for poor terminal connections. Repair as necessary. After repairs, go to step  26. If connections are okay, go to next step.
  19. Replace fuel pump relay. After repairs, go to step  26.
  20. Repair short to ground in fuel pump relay battery feed circuit between fuel pump relay and ECM B fuse. After repairs, go to step  26.
  21. Turn ignition off. Reinstall fuel pump relay. Install a NEW ECM B fuse (20-amp). Reconnect fuel pump harness connector. Turn ignition on with engine off. Using scan tool, command fuel pump on. Check ECM B fuse. If fuse is open, go to step  24. If fuse is okay, see appropriate TROUBLE SHOOTING - NO CODES article.
  22. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  26. If connections are okay, go to next step.
  23. Replace PCM. Perform PCM relearn procedures. After repairs, go to step  26.
  24. Check for a short to ground in fuel pump wiring harness at fuel tank. Repair as necessary. After repairs, go to step  26. If wiring harness is okay, go to next step.
  25. Replace fuel pump. After repairs, go to step  26.
  26. 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, go to step  2.
  27. Allow engine to reach normal operating temperature. Using scan tool, check for DTCs. If any DTCs are present, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If no DTCs are present, go to next step.
  28. Using scan tool, select CAPTURE INFO and REVIEW INFO function. If any DTCs are present that have not been diagnosed, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If no DTCs are present, system is okay.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
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  • • The engine overheats, stalls repeatedly, or misfires under load.
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  • • You are not confident in the next step or safety outcome.