TSRM/MK2 Supra/Repair Manual
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BE/Body Electrical System — Inspection of Speed Sensor Circuit, page 81

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Inspection of Speed Sensor Circuit — MK2 Supra Body Electrical System, page 81
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Page text (OCR transcript)
H

INSPECTION OF SPEED SENSOR CIRCUIT

Turn ignition switch on.

SPEED SENSOR

INSPECT GROUND CONNECTION
Disconnect connector from combination meter.
Is there continuity between terminal C-6
(analog meter) or A-10 (digital meter) of wire
harness side connector and body ground?

Yes → Short circuit in wire harness between terminal C-6 (analog meter) or A-10 (digital meter) and body ground.

No ↓

COMPUTER

INSPECT SPEED SENSOR CIRCUIT
Disconnect connector from combination
meter.
Is there continuity between terminal C-7
(analog meter) or A-12 (digital meter) of
wire harness side connector and terminal
6 of computer?

No → Open circuit in wire harness between terminal C-7 (analog meter) or A-12 (digital meter) of combination meter and terminal 6 of computer.

Yes ↓

INSPECT SPEED SENSOR OPERATION
Is speed sensor operation normal?
(See page BE-83)

No → Speed sensor faulty.

Yes ↓

Replace computer.