Toyota Celica Supra 1986 Service And Repair Manual page 286

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AUTOMATIC TRANSMISSION - Electric Control
AT·11
(e) If voltage rises from OV to 7V in the sequence shown, the
control system is okay.
(fl
The voltage could rise anywhere between OV -
fN
be·
fore the vehicle reaches 10 kmlh 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/h or 6 mph, the voltmeter indicates the cur·
rent gear.
NOTE: Determine the geer position by alight shock or change
In engine rpm when shifting.