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Diagnosis & Repair

  1. Check for spark at misfiring cylinder. See IGNITION CHECKS in BASIC DIAGNOSTICS article. If spark is present, go to next step. If spark is not present, go to step 4).
  2. Check for open or short in IGF circuit between ECM and igniter. Igniter is located near brake master cylinder. See appropriate wiring diagram in WIRING DIAGRAMS . Repair as necessary. If circuit is okay, go to next step.
  3. Disconnect 8-pin igniter connector. Access ECM behind glove box. Turn ignition on. Measure voltage between ground and terminal No. 7 (Light Green/Black wire) at ECM E7 connector. See Figure. If voltage is 4.5-5.5 volts, replace igniter. If voltage is not 4.5-5.5 volts, replace ECM and retest.
  4. Check for open or short in IGT1 circuit (Light Green wire) and IGT2 circuit (Blue/Yellow wire) between ECM and igniter. See appropriate wiring diagram in WIRING DIAGRAMS . Repair as necessary. If circuit is okay, go to next step.
  5. Access ECM behind glove box. Locate ECM E7 connector. See Figure. Backprobing ECM connector, measure voltage between ground and terminals No. 5 (Blue/Yellow wire) and No. 6 (Light Green wire) at ECM E7 connector while cranking engine. If both readings are .1-4.5 volts, go to next step. If any reading is not .1-4.5 volts, replace ECM and retest.
  6. Disconnect 8-pin igniter connector. Backprobing ECM connector, measure voltage between ground and terminals No. 5 (Blue/Yellow wire) and No. 6 (Light Green wire) at ECM E7 connector while cranking engine. If both readings are .1-4.5 volts, go to next step. If any reading is not .1-4.5 volts, replace ECM and retest.
  7. Turn ignition on. Measure voltage between ground and terminal No. 7 (Black/Orange wire) at igniter wiring harness connector. See Fig 1. If voltage is 9-14 volts, go to next step. If voltage is not 9- 14 volts, check and repair igniter power source circuit. See appropriate wiring diagram in WIRING DIAGRAMS article.
  8. Check for an open or short in wiring harness between ignition switch and ignition coil, and between ignition coil and igniter. Repair as necessary. If wiring is okay, go to next step.
  9. Check ignition coil. See IGNITION CHECKS in BASIC DIAGNOSTICS article. Replace coil as necessary. If coil is okay, replace igniter.
Fig 1: Identifying Igniter Connector Terminals
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