Ignitor Power Transistor

Turn ignition off. Unplug 4-pin connector from ignition module, located near the alternator. See Figure. Disconnect electrical connectors from ignition coil pack.
Turn ignition on. Connect ohmmeter between terminal No. 2 of third ignition coil and ground. See Fig 1-21. Using a 3-volt battery, apply 3 volts to terminal No. 2 of 4-pin connector. See Fig 1-21. With 3 volts applied, ensure ohmmeter indicates continuity momentarily.
Connect ohmmeter between terminal No. 2 of first ignition coil and ground. Apply 3 volts to terminal No. 4 of 4-pin connector. See Fig 1-21. With 3 volts applied to terminal No. 4, also apply 3 volts to terminal No. 2 of 4-pin connector. Ensure ohmmeter momentarily indicates continuity. See Fig 1-21.
Connect ohmmeter between terminal No. 2 of second ignition coil and ground. See Fig 1-21. Apply 3 volts to terminal No. 3 of 4-pin connector. With 3 volts applied to terminal No. 3, also apply 3 volts to terminal No. 2.
Ensure ohmmeter momentarily indicates continuity. See Fig 1-21. Replace assembly if defective. If ignitor is okay, check pick-up coil resistance. See PICK-UP COIL AIR GAP under IGNITION CHECKS (SUPRA TURBO).

Fig 1: Step 1 Checking Ignitor Power Transistor (Supra Turbo)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Step 2 Checking Ignitor Power Transistor (Supra Turbo)

Fig 3: Step 3 Checking Ignitor Power Transistor (Supra Turbo)