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Diagnosis & Repair

  1. Inspect for spark at plugs. Remove plug wire from individual spark plug. Remove spark plug and insert into wire. Disconnect appropriate injector harness connector. Ground spark plug and crank engine. Ensure spark is present.
  2. If spark does not exist, go to step 5). If spark does exist, inspect IGF circuit between ignitor and ECM for short or open. See Figure and Fig 1. See wiring diagram in the WIRING DIAGRAMS article.
  3. Repair as needed. If circuit is okay, disconnect ignitor connector. Ignitor is mounted to left inner fender, on left side of brake master cylinder. Access ECM behind instrument panel right speaker. Turn ignition on. Using DVOM, backprobe ECM connector.
  4. Measure voltage between terminal IGF and ground. See Figure. If voltage is 4.5-5.5 volts, replace ignitor and retest. If voltage is not 4.5-5.5 volts, replace ECM and retest.
  5. Access ECM behind instrument panel right speaker. Turn ignition on. Using DVOM, backprobe ECM connector. Measure voltage between terminal IGT of ECM connector and ground, while cranking engine. Voltage should be .5-1.0 volt.
  6. If voltage is within specification, go to next step. If voltage for any circuit is NOT within specification, go to step 10).
  7. Disconnect ignitor connector. Ignitor is mounted to left inner fender, on left side of brake master cylinder. Measure voltage between ignitor harness connector terminal No. 3 and ground. See Fig 1. Turn ignition switch to ON position. Voltage should be 9-14 volts. Turn ignition switch to START position. Voltage should be 9-14 volts.
  8. If voltage is NOT within specification, inspect ignitor power supply circuit. See wiring diagram in the WIRING DIAGRAMS article. Repair as needed. If voltage is within specification, inspect circuit between ignition switch and coil, and coil and ignitor for open or short. Repair as needed.
  9. If circuits are okay, inspect ignition coil. See the BASIC TESTING article. Replace as needed. If coil is okay, replace ignitor and retest.
  10. Access ECM behind instrument panel right speaker. Turn ignition on. Using DVOM, backprobe ECM connector. Ensure ignitor connector is disconnected. Measure voltage between terminal IGT of ECM connector and ground, while cranking engine. See Figure. Voltage should be .5-1.0 volt for each circuit.
  11. If voltage is within specification, replace ignitor and retest. If voltage is NOT within specification, inspect IGT circuit between ignitor and ECM for open or short. Repair as needed. If circuit is okay, replace ECM and retest.
Fig 1: Identifying Ignitor Harness Connector Terminals
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