Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
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Vehicle Speed Sensor: Description and Operation
VEHICLE SPEED SENSOR (VSS) The PCM determines the speed of the vehicle by converting a pulsing voltage signal from the vehicle speed sensor (VSS) into miles per hour. The PCM uses this signal to operate the cruise control, speedometer, and the TCC and shift solenoids in the transmission.