TSRM/MK3 Supra/Repair Manual
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IG/Ignition System — Inspection of Ignition Coil, page 12

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Inspection of Ignition Coil — MK3 Supra Ignition System, page 12
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Page text (OCR transcript)
INSPECTION OF IGNITION COIL

1. INSPECT POWER SOURCE LINE
(a) Disconnect the high-tension cord from the ignition coil.
(b) Disconnect the ignition coil connectors.
(c) Turn the ignition switch ON.

(d) Using a voltmeter, measure the voltage between terminal 1 and body ground.
Voltage: Approx. 12V

2. INSPECT PRIMARY COIL RESISTANCE
Using an ohmmeter, measure the resistance between the positive (+) and negative (-) terminals.
Primary coil resistance (cold): 0.3 - 0.5 Ω

3. INSPECT IGNITION COIL GROUND
Using an ohmmeter, check that there is no continuity between the ignition coil terminal and body ground.

4. IF NECESSARY, REPLACE IGNITION COIL
Using a hexagon wrench 3 mm (0.12 in.), replace the ignition coil.