Operation CHARM
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Land Rover
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1996
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Discovery I (LJ) V8-4.0L
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Repair and Diagnosis
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Cruise Control
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Description and Operation
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Circuit Operation
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Speed Input
Speed Input
Terminal 11 of the Cruise Control ECU (Z121) monitors the Vehicle Speed output signal from the Instrument Cluster (Z142) through the YK wire. This signal is a pulsing voltage, and its frequency changes with vehicle speed.