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HOMESERVICE MANUALSGMC2001SONOMA 2D PICKUP, 2.2 5, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC DIAGNOSTIC PROCEDURESNO-START DIAGNOSISNO-START - ENGINE CRANKS OKAY (4.3L, 5.0L & 5.7L)IGNITION SYSTEM
2001 GMC Sonoma 2D Pickup, 2.2 5, Automatic

Ignition System

2001 GMC Sonoma 2D Pickup, 2.2 5, AutomaticSECTION Ignition System
  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. Check condition of spark plug wires. Replace if necessary. Using Spark Tester (J-26792), check for spark at spark plug wires while cranking engine. If spark is present, check for intermittent problem. See appropriate TROUBLE SHOOTING - NO CODES article. If no spark is present, go to next step.
  3. Remove coil wire from distributor cap. Check for spark at coil wire while cranking engine. If spark is present, go to step  13. If spark is not present, go to next step.
  4. Measure resistance of coil wire. If resistance is no greater than 1000 ohms per inch, go to next step. If resistance is greater than 1000 ohms per inch, go to step  32.
  5. Disconnect ignition coil harness connector. Using test light connected to battery voltage, probe ignition coil driver circuit at ignition coil harness connector. Crank engine. If test light flashes, go to step  7. If test light does not flash, go to next step.
  6. Turn ignition off. Using test light connected to battery voltage, probe ignition coil driver circuit at ignition coil harness connector. If test light illuminates, go to step  28. If test light does not illuminate, go to step  9.
  7. Using test light connected to battery voltage, probe tachometer circuit at ignition coil harness connector. If test light illuminates, go to step  29. If test light does not illuminate, go to next step.
  8. Turn ignition on. Measure voltage between ground and ignition feed circuit at ignition coil harness connector. If voltage is greater than 10 volts, go to step  21. If voltage is not greater than 10 volts, go to step  18.
  9. Turn ignition off. Disconnect ignition control module harness connector. Check for open in coil driver circuit between ignition control module and ignition coil. If circuit is open, go to step  27. If circuit is okay, go to next step.
  10. Turn ignition on. Measure voltage between ground and ignition feed circuit at ignition control module harness connector. If voltage is greater than 10 volts, go to next step. If voltage is not greater than 10 volts, go to step  19.
  11. Using test light connected to battery voltage, probe ignition control module ground circuit at ignition control module harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  23.
  12. Using DVOM set to AC scale, measure voltage between ground and ignition control module control circuit at ignition control module harness connector while cranking engine. If AC voltage is 1-4 volts, go to step  20. If voltage is not 1-4 volts, go to step  15.
  13. Remove distributor cap. Check for cracks, moisture or carbon tracking. If a problem is found, go to step  34. If distributor cap is okay, go to next step.
  14. Crank engine and observe distributor rotor. If distributor rotor turns, go to step  33. If distributor rotor does not turn, repair distributor or engine mechanical problem.
  15. Turn ignition off. Disconnect VCM harness connector C3 (Clear). Check for open in ignition timing signal circuit between ignition control module and VCM. If circuit is open, go to step  24. If circuit is okay, go to next step.
  16. Using test light connected to battery voltage, probe ignition control module control circuit at VCM harness connector. If test light illuminates, go to step  25. If test light does not illuminate, go to next step.
  17. Turn ignition on. Using test light connected to ground, probe ignition control module control circuit at VCM harness connector. If test light illuminates, go to step  26. If test light does not illuminate, go to step  22.
  18. Repair open or short to ground in ignition feed circuit to ignition coil. After repairs, go to step  37.
  19. Repair open or short to ground in ignition feed circuit to ignition control module. After repairs, go to step  37.
  20. Check for poor connections at ignition control module. If connections are faulty, go to step  30. If connections are okay, go to step  35.
  21. Check for poor connections at ignition coil. If connections are faulty, go to step  30. If connections are okay, go to step  31.
  22. Check for poor connections at VCM. If connections are faulty, go to step  30. If connections are okay, go to step  36.
  23. Repair open in ignition control module ground circuit. After repairs, go to step  37.
  24. Repair open in ignition control circuit between VCM and ignition control module. After repairs, go to step  37.
  25. Repair short to ground in ignition control circuit between VCM and ignition control module. After repairs, go to step  37.
  26. Repair short to voltage in ignition control circuit between VCM and ignition control module. After repairs, go to step  37.
  27. Repair open in ignition coil driver circuit between ignition coil and ignition control module. After repairs, go to step  37.
  28. Repair short to ground in coil driver circuit between ignition coil and ignition control module. After repairs, go to step  37.
  29. Repair short to ground in tachometer input circuit between ignition coil and instrument cluster. After repairs, go to step  37.
  30. Repair faulty circuit as necessary. After repairs, go to step  37.
  31. Replace ignition coil. After repairs, go to step  37.
  32. Replace coil wire. After repairs, go to step  37.
  33. Replace distributor rotor. After repairs, go to step  37.
  34. Replace distributor cap. After repairs, go to step  37.
  35. Replace ignition control module. After repairs, go to step  37.
  36. Replace VCM. Perform VCM relearn procedures. After repairs, go to next step.
  37. Operate system to verify repairs. If system operation is okay, testing is complete. If system operation is not okay, go to step  1.
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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.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.