TSRM/MK2 Supra/Repair Manual
Repair ManualWiring Diagrams
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AT/Automatic Transmission, page 11

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Automatic Transmission — MK2 Supra Automatic Transmission, page 11
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Page text (OCR transcript)
(e) If voltage rises from 0V to 7V in the sequence shown, the control system is okay.
(f) The voltage could rise anywhere between 0V — 8V before the vehicle reaches 10 km/hr or 6 mph in first gear. The voltage jump depends on what percent the throttle valve is opened. This is a normal reading.
Above 10 km/hr or 6 mph, the voltmeter indicates the current gear.

NOTE: Determine the gear position by a light shock or change in engine rpm when shifting.