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Inspection Procedure 31 - Ignition System Circuit

NOTE: For wiring diagram, see WIRING DIAGRAMS article.
NOTE: Possible causes are: defective ignition switch or ignition power transistor, loose connector, open or shorted ignition switch or ignition power transistor wiring circuit, or defective ECM.
  1. Disconnect connector at ignition coil. Ignition coil is located on top of engine, between valve covers and contains a 3-pin connector. Turn ignition on.
  2. Using voltmeter, check voltage between ground and terminal No. 3 (Black/White wire) on wiring harness side of connector. Battery voltage should exist.
  3. If battery voltage exists, go to step 5). If battery voltage does not exist, check for defective terminals on connector. If terminals are defective, repair as necessary. If terminals are okay, go to next step.
  4. Check for a trouble symptom. For specific symptoms, see the TROUBLE SYMPTOM INSPECTION  . If no trouble symptom exists, check wiring harness between ignition coil and ignition switch. Repair wiring harness if defective. If wiring harness is okay, check ignition switch.
  5. Ensure ignition is off. Disconnect connector at ignition power transistor. Ignition power transistor is mounted on top of engine, near ignition coil and contains an 8-pin Black connector.
  6. Using ohmmeter, check for continuity between ground and terminal No. 3 (Black wire) on wiring harness side of connector. Continuity should exist.
  7. If continuity exists, go to next step. If no continuity exists, check for defective ground circuit on Black wire. Repair wiring as necessary.
  8. Check for defective terminals or connections at ignition coil and ignition power transistor connectors. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, go to next step.
  9. Check for a trouble symptom. For specific symptoms, see the TROUBLE SYMPTOM INSPECTION  . If no trouble symptom exists, check ignition coil. See the BASIC TESTING - TURBO article.
  10. Replace ignition coil if defective. If ignition coil is okay, check ignition power transistor. See BASIC TESTING - TURBO article.
  11. Replace ignition power transistor if defective. If ignition power transistor is okay, go to next step.
  12. Reinstall connector on ignition coil. Turn ignition on. Using voltmeter, check voltage between ground and terminals No. 1 (Blue/Black wire) and No. 8 (Black/White wire) at end of connector on wiring harness side of connector for ignition power transistor.
    NOTE: When checking voltage at terminal No. 8 (Black/White wire) on connector for ignition power transistor, terminal No. 8 is the end terminal on the connector. DO NOT use Black/White wire at terminal No. 6, closer to the center of the connector.
  13. Battery voltage should exist. If battery voltage exists, go to step 16). If battery voltage does not exist, check for defective terminals or connections on ignition coil connector.
  14. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, go to next step.
  15. Check for a trouble symptom. For specific symptoms, see the TROUBLE SYMPTOM INSPECTION  . If no trouble symptom exists, check wiring harness between ignition coil and ignition power transistor. Repair wiring harness if defective.
  16. Using voltmeter, check voltage between ground and terminals No. 2 (Brown/Red wire) and No. 7 (Black/Blue wire) at wiring harness side of connector for ignition power transistor while cranking engine.
  17. Voltage should be .5-4.0 volts. If voltage is within specification, go to step 21). If voltage is not within specification, go to next step.
  18. Check for defective terminals or connections on 26-pin ECM connector B-53. The ECM is located below instrument panel, just in front of center console.
  19. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the TROUBLE SYMPTOM INSPECTION  . If no trouble symptom exists, go to next step.
  20. Check wiring harness between ECM and ignition power transistor. Repair wiring harness if defective. If wiring harness is okay, replace ECM.
  21. Check for defective terminals or connections on connector for ignition power transistor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the TROUBLE SYMPTOM INSPECTION  . If no trouble symptom exists, check ignition signal circuit. Perform INSPECTION PROCEDURE 46.
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