Toyota Celica Supra 1986 Service And Repair Manual page 665

BODY ELECTRICAL SYSTEM -Trip Computer
BE-117
7·terminal Connector (of Wiring)
(e) Inspect the battery voltage between terminal < and
body ground of wiring coonector with the ignition
switch at ON position.
3. INSPECT SPEED SENSOR LINE TO CONNECTOR
With the ignition switch at ON position, check that there is
continuity between terminals f and GND of wiring connec·
tor four times per each revolution of the magnet shaft.