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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check for spark at cylinder No. 3 by performing spark test. See IGNITION SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 4-CYLINDER article. Cylinder No. 3 is third cylinder from timing chain end of engine. If spark is exists, go to next step. If spark does not exist, go to step  4.
  2. Check for open or short in White wire between terminal No. 25 at ECM harness connector E9 and terminal No. 2 at ignitor/ignition coil No. 3 harness connector. See Figure and Figure . If problem does not exist, go to next step. If problem exists, repair wiring as necessary.
  3. Disconnect ignitor/ignition coil No. 3 harness connector. Access ECM behind glove box. See Figure. Turn ignition on. Using DVOM, backprobe ECM and measure voltage between ground and terminal No. 25 (White wire) at ECM harness connector E9. See Figure. If voltage is 4.5-5.5 volts, replace ignitor/ignition coil No. 3. If voltage is not 4.5-5.5 volts, replace ECM.
  4. Check for open or short in Blue/Yellow wire between terminal No. 12 at ECM harness connector E9 and terminal No. 3 at ignitor/ignition coil No. 3 harness connector. See WIRING DIAGRAMS article. If problem does not exist, go to next step. If problem exists, repair wiring as necessary.
  5. Access ECM behind glove box. See Figure. Using DVOM, backprobe ECM and measure voltage between ground and terminal No. 12 (Blue/Yellow wire) at ECM harness connector E9 while cranking engine. See Figure. If .1-4.5 volts does not exist, go to next step. If .1-4.5 volts exists, go to step  7.
  6. Turn ignition off. Disconnect ignitor/ignition coil No. 3 harness connector. Using DVOM, backprobe ECM and measure voltage between ground and terminal No. 12 (Blue/Yellow wire) at ECM harness connector E9 while cranking engine. If .1-4.5 volts exists, replace ignitor/ignition coil No. 3. If .1-4.5 volts does not exist, replace ECM.
  7. Turn ignition off. Disconnect ignitor/ignition coil No. 3 harness connector. Turn ignition on. Measure voltage between ground and terminal No. 1 (Black wire) at ignitor/ignition coil No. 3 harness connector. See Figure. If voltage is 9-14 volts, go to next step. If voltage is not 9-14 volts, check and repair ignitor/ignition coil No. 3 power source circuit. See WIRING DIAGRAMS article.
  8. Check ignitor/ignition coil No. 3 ground circuit. See WIRING DIAGRAMS article. If problem exists, repair as necessary. If problem does not exist, replace ignitor/ignition coil No. 3.
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