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Home >> Pontiac >> 2002 >> Aztek AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Ignition System >> Electronic Ignition System Diagnosis (3.4L) >> Diagnostic Procedure
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Diagnostic Procedure

  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 3.4L AZTEK & RENDEZVOUS or SELF-DIAGNOSTICS - 3.4L MONTANA, SILHOUETTE & VENTURE article. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Attempt to start engine. Does engine start and continue to run? If yes, problem is intermittent. If no, go to next step.
  3. Disconnect 24x crank sensor. With scan tool, observe 3x crank sensor parameter and crank engine. Does scan tool indicate 3x crank sensor signal present? If yes, go to next step. If no, go to step  11.
  4. Reconnect 24x crank sensor. With Spark Tester (J 26792), test for spark at each cylinder. Did you observe any non-sparking cylinders? If yes, go to next step. If no, go to step  8.
    5. NOTE: An arcing spark plug wire or an arcing ignition coil to IC module may cause a stall or a no-start condition.
  5. Inspect and test affected cylinder spark plug wires, ignition coils, and spark plugs for a short to ground or an arcing to ground. If carbon tracking or corrosion is present, replace both components that are affected. Did you find and correct condition? If yes, go to step  23. If no, go to next step.
  6. Test affected spark plug wires for proper resistance. Replace spark plug wires not near 3000 ohms per ft (9868 ohms per m). Did you find and correct condition? If yes, go to step  23. If no, go to next step.
  7. Switch affected cylinder coil with a known good one. If fault follows affected coil, then replace coil. Did you find and correct condition? If yes, go to step  23. If no, go to step  15.
  8. Inspect spark plug wires for proper routing and for correct firing order. If any spark plug wires are found to be misrouted, reroute as necessary. Did you find and correct condition? If yes, go to step  23. If no, go to next step.
  9. With DMM, test spark plugs for internal short to ground. Replace any grounded spark plugs that are found. Did you find and correct condition? If yes, go to step  23. If no, go to next step.
  10. Remove spark plugs. Inspect spark plugs for damage. If any spark plugs are found to be bad, replace affected spark plugs. After repairs, go to step  23.
  11. Reconnect 24x crank sensor. Disconnect IC module connectors. Turn ON the ignition. With test light that is connected to a good ground, probe IC module Ignition 1 voltage circuit. Does test light illuminate? If yes, go to next step. If no, go to step  17.
  12. Connect test light between IC module Ignition 1 voltage circuit and IC module ground circuit. Does test light illuminate? If yes, go to next step. If no, go to step  20.
  13. Disconnect 7x crankshaft sensor connector from IC module. With test light connected to battery voltage, probe both CKP sensor 1 signal 7x and low reference 7x circuits. Does test light illuminate when probing either circuits? If yes, go to step  18. If no, go to next step.
  14. Connect test light to ground. Probe CKP sensor 1 signal 7x and reference low 7x circuits. Does test light illuminate when probing either circuit? If yes, go to step  19. If no, go to next step.
  15. Ensure battery voltage is within specifications. Turn off the ignition. Connect DMM between CKP sensor 1 signal circuit 7x and low reference 7x circuit at IC module harness connector. Crank engine while observing AC duty cycle percent. Does DMM indicate AC duty cycle is present? If yes, go to step  21. If no, go to next step.
  16. Test 7x crank sensor circuits for the following conditions:
    • Opens.
    • CKP sensor 1 signal and low reference 7x circuits are shorted together.

    Repair any damaged wiring. Did you find and correct condition? If yes, go to step  23. If no, go to step  22.

  17. Repair open or short to ground in IC module Ignition 1 voltage circuit. Replace fuse if necessary. After repairs, go to step  23.
  18. Repair short to ground in circuit which illuminated test light. After repairs, go to step  23.
  19. Repair short to voltage in circuit which illuminated test light. After repairs, go to step  23.
  20. Repair open in IC module ground circuit. After repairs, go to step  23.
  21. Replace IC module. After repairs, go to step  23.
  22. Replace 7x crank sensor. After repairs, go to next step.
  23. Remove all test equipment. Connect any disconnected components or any disconnected fuses. Turn the ignition OFF for 30 seconds. Start engine and operate. Observe MIL, vehicle performance, and driveability. Does vehicle operate correctly, without any MIL illumination and without any stored DTCs? If yes, system is okay. If no, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 3.4L AZTEK & RENDEZVOUS or SELF-DIAGNOSTICS - 3.4L MONTANA, SILHOUETTE & VENTURE article.
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