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Diagnosis & Repair

  1. Check for spark at misfiring cylinder. See IGNITION SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - V6 & V8 article. If spark exists, go to next step. If spark does not exist, go to step  4.
  2. Check for open or short in Black wire between terminal No. 11 at ECM harness connector E5 and ignition coil/ignitor No. 1. Also, check for open or short in Black/White wire between terminal No. 27 at ECM harness connector E5 and ignition coil/ignitor No. 1. See WIRING DIAGRAMS article. If problem exists, repair wiring as necessary. If problem does not exist, go to next step.
  3. Disconnect ignition coil/ignitor No. 1 harness connector. Access ECM behind glove box. Turn ignition on. Using DVOM, backprobe at ECM harness connector and measure voltage between ground and terminal No. 27 (Black/White wire) at ECM harness connector E5. See Figure. If voltage is 4.5-5.5 volts, replace ignition coil/ignitor No. 1. If voltage is not 4.5-5.5 volts, replace ECM.
  4. Check for open or short in Black wire between terminal No. 11 at ECM harness connector E5 and ignition coil/ignitor No. 1. See WIRING DIAGRAMS article. If problem exists, repair wiring as necessary. If problem does not exist, go to next step.
  5. Access ECM behind glove box. Using DVOM, backprobe ECM harness connector and measure voltage between ground and terminal No. 11 (Black wire) at ECM harness connector E5 while cranking engine. See Figure. If voltage is .1-4.5 volts, go to next step. If voltage is not .1-4.5 volts, replace ECM.
  6. Disconnect ignition coil/ignitor No. 1 harness connector. Using DVOM, backprobe ECM harness connector and measure voltage between ground and terminal No. 11 (Black wire) at ECM harness connector E5 while cranking engine. If voltage is .1-4.5 volts, go to next step. If voltage is not .1-4.5 volts, replace ECM.
  7. Turn ignition on. Measure voltage between ground and terminal No. 1 (Black/Red wire) at ignition coil/ignitor No. 1 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 ignition coil/ignitor No. 1 power source circuit. See WIRING DIAGRAMS article.
  8. Check for open or short in wiring between ground and ignition coil/ignitor No. 1. See WIRING DIAGRAMS article. If problem exists, repair wiring as necessary. If problem does not exist, go to next step.
  9. Check EFI main relay. See MOTORS & RELAYS in SYSTEM & COMPONENT TESTING - V6 & V8 article. If problem exists, replace EFI main relay. If problem does not exist, replace ignition coil/ignitor No. 1.
Fig 1: Identifying Ignition Coil/Ignitor Harness Connector Terminals
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