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Diagnosis & Repair

  1. Inspect for spark at plugs. Remove 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 distributor and ECM for short or open. See wiring diagram in the WIRING DIAGRAMS - 2.4L article.
  3. Repair as needed. If circuit is okay, disconnect distributor connectors. Access ECM behind right kick panel. Turn ignition on. Using DVOM, backprobe ECM connector.
  4. Measure voltage between terminal IGF and ground. See Fig 1, Fig 2 and Fig 3. If voltage is 4.5-5.5 volts, replace igniter. Igniter is located on ignition coil. If voltage is NOT 4.5-5.5 volts, replace ECM and retest.
  5. Access ECM behind right kick panel. Start engine. Using DVOM, backprobe ECM connector. Measure voltage between terminal IGT of ECM connector and ground, while engine idling. Voltage should pulse from .7 to 1.0 volt.
  6. If voltage is within specification, go to next step. If voltage is NOT within specification, go to step 9).
  7. Disconnect igniter connector. Measure voltage between harness connector terminal No. 3 and ground. See Fig 4. Turn ignition 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 igniter power supply circuit. See wiring diagram in WIRING DIAGRAMS - 2.4L article. Repair as needed. If voltage is within specification, inspect ignition coil. See the BASIC TESTING - 2.4L article. Replace as needed. If coil is okay, replace igniter and retest.
  9. Access ECM behind right kick panel. Turn ignition on. Using DVOM, backprobe ECM connector. Ensure distributor connector is disconnected. Measure voltage between terminal IGT of ECM connector and ground, while cranking engine. See Fig 1, Fig 2 and Fig 3. Voltage should pulse from .7 and 1.0 volt.
  10. If voltage is within specification, replace igniter in distributor and retest. If voltage is NOT within specification, inspect IGT circuit between igniter and ECM for open or short. Repair as needed. If circuit is okay, replace ECM and retest.
Fig 1: Identifying ECM Connector Terminals (2WD)
G95J32127Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Identifying ECM Connector Terminals (4WD M/T)
G95A32128Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Identifying ECM Connector Terminals (4WD A/T)
G95B32129Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: Identifying Igniter Harness Connector Terminals
G95I32126Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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