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Ignitor Power Transistor Check

WARNING: This page is about a different car, the 1989 Toyota Supra, 1989 Toyota Land Cruiser, and 1989 Toyota Cressida. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Unplug ignition module 4-pin connector. Disconnect each ignition coil pack 2-pin connector.
  2. Turn ignition switch to "ON" position. Connect ohmmeter between terminal No. 2 of third ignition coil and ground. Using a 3-volt dry cell battery, apply 3 volts to terminal No. 2 of 4-pin connector. With 3 volts applied, check that ohmmeter indicates momentary continuity. See Fig 2.
  3. Connect ohmmeter between terminal No. 2 of first ignition coil and ground. Apply 3 volts to terminal No. 4 of 4-pin connector. With 3 volts still applied to terminal No. 4, also apply 3 volts to terminal No. 2. Check that ohmmeter indicates momentary continuity. See Fig 2.
  4. Connect ohmmeter between terminal No. 2 of second ignition coil and ground. Apply 3 volts to terminal No. 3 of 4-pin connector. With 3 volts still applied to No. 3, also apply 3 volts to terminal No. 2. Ensure ohmmeter indicates momentary continuity. See Fig 2.
Fig 1: Supra Turbo Ignition System Schematic
G118584Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Testing Supra Turbo Ignitor
G118585Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: For adjustment procedures, see appropriate D-ADJUSTMENTS FUEL INJECTION article.
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