TSRM/MK3 Supra/Repair Manual
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BE/Body Electrical System — Inspection of speed sensor circuit., page 71

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Inspection of speed sensor circuit. — MK3 Supra Body Electrical System, page 71
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Page text (OCR transcript)
E    Inspection of speed sensor circuit.

SPEEDOMETER CABLE

INSPECT SPEEDOMETER CABLE
Does the meter fluctuate when driving at a
steady speed?

Yes → Meter cable faulty.

No ↓

Turn ignition switch off.

SPEED SENSOR

INSPECT GROUND CONNECTION
Disconnect connector from meter (speed
sensor).
Is there continuity between terminal 5 of wire
harness side connector and body ground?

No → Open circuit in wire harness between
terminal 5 and body ground.

Yes ↓

INSPECT SPEED SENSOR OPERATION
Is speed sensor operation normal?
(See page BE-84)

No → Speed sensor faulty.

Yes ↓

COMPUTER

INSPECT SPEED SENSOR CIRCUIT
Disconnect connector from computer.
Is there continuity between terminal 6 of wire
harness side connector and terminal 7 of
computer.

No → Open circuit in wire harness between
terminal 6 of speed sensor and terminal
7 of computer.

Yes ↓

Replace computer.