TSRM/MK3 Supra/Repair Manual
Repair ManualWiring Diagrams
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BE/Body Electrical System71 / 116
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Inspection of speed sensor circuit. — MK3 Supra Body Electrical System, page 71
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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.