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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 article.
  3. Repair as needed. If circuit is okay, disconnect distributor connectors. Access ECM behind center console. Turn ignition on. Using DVOM, backprobe ECM connector.
  4. Measure voltage between terminal IGF and ground. See Fig 1 (A/T Except Calif.) or 13 (M/T Except Calif.). If voltage is 4.5-5.5 volts, replace igniter. Igniter is located in left corner of firewall. If voltage is NOT 4.5-5.5 volts, replace ECM and retest.
  5. Access ECM behind center console. Turn ignition on. Using DVOM, backprobe ECM connector. Measure voltage between terminal IGT of ECM connector and ground, while cranking engine. Voltage should pulse from .5 to 4.5-5.5 volts.
  6. If voltage is within specification, go to next step. If voltage is NOT within specification, go to step 9).
  7. Disconnect distributor 2-pin connector. Measure voltage between harness connector terminal No. 1 (Black/Red wire) and ground. 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 igniter power supply circuit. See wiring diagram in the WIRING DIAGRAMS article. Repair as needed. If voltage is within specification, inspect ignition coil. See the BASIC TESTING article. Replace as needed. If coil is okay, replace igniter in distributor and retest.
  9. Access ECM behind center console. Turn ignition on. Using DVOM, backprobe ECM connector. Ensure distributor connectors are disconnected. Measure voltage between terminal IGT of ECM connector and ground, while cranking engine. See Fig 1 (A/T Except Calif.) or 13 (M/T Except Calif.). Voltage should pulse between .5 and 4.5-5.5 volts.
  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 (A/T - Except Calif.)
G95D32121Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Identifying ECM Connector Terminals (M/T - Except Calif.)
G95C32120Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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