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Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> No-Start Diagnosis >> No-Start - Engine Cranks Okay (3.4L) >> Ignition System

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. Disconnect 24X CKP sensor. Using scan tool, monitor 3X reference parameter while cranking engine. If scan tool indicates 3X reference, go to next step. If scan tool does not indicate 3X reference, go to step  9.
  3. Reconnect 24X CKP sensor. Using Spark Tester (J-26792), check for spark at each cylinder. If any cylinders did not have spark, go to next step. If all cylinders have spark, go to step  7.
  4. Check spark plugs, spark plug wires and ignition coils for short to ground or carbon tracking. Repair as necessary. If no problem is found, go to next step.
  5. Measure resistance of spark plug wires in question. Resistance should be no more than 600 ohms per foot. Repair as necessary. If spark plug wires are okay, go to next step.
  6. Switch ignition coil in question with a known-good ignition coil. If fault follows ignition coil in question, replace ignition coil. If fault does not follow ignition coil in question, go to step  13.
  7. Check spark plug wires for correct routing and firing order. Repair as necessary. If no problem is found, go to next step.
  8. Using DVOM, check spark plugs for internal short to ground. Replace faulty spark plugs as necessary.
  9. Reconnect 24X CKP sensor. Disconnect 2-pin ignition control module harness connector. Turn ignition on. Using test light connected to ground, probe ignition control module ignition feed circuit at 2-pin harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  15.
  10. Connect test light between ignition control module ignition feed circuit and ignition control module ground circuit at 2-pin harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  18.
  11. Disconnect 7X CKP sensor harness connector from ignition control module. Using test light connected to battery voltage, probe 7X CKP sensor reference high and reference low circuits at ignition control module harness connector. If test light illuminates for either circuit, go to step  16. If test light does not illuminate for either circuit, go to next step.
  12. Using test light connected to ground, probe 7X CKP sensor reference high and reference low circuits at ignition control module harness connector. If test light illuminates for either circuit, go to step  17. If test light does not illuminate for either circuit, go to next step.
  13. Ensure battery voltage is within specification. Turn ignition off. Using DVOM set to measure AC duty cycle percent, connect leads between 7X CKP sensor reference high and reference low circuits at ignition control module harness connector. Crank engine. If DVOM indicates AC duty cycle, go to step  19. If DVOM does not indicate AC duty cycle percent, go to next step.
  14. Check 7X CKP sensor reference high and reference low circuits for opens or short together. Repair as necessary. If circuits are okay, go to step  20.
  15. Repair open or short to ground in ignition control module ignition feed circuit.
  16. Repair short to ground in 7X reference circuit which illuminated test light.
  17. Repair short to voltage in 7X reference circuit which illuminated test light.
  18. Repair open in ignition control module ground circuit.
  19. Replace ignition control module.
  20. Replace 7X CKP sensor.
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