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Vehicle Speed Sensor

The Vehicle Speed Sensor (VSS) is a Permanent Magnet (PM) generator mounted on the transmission. See Fig 1 . The VSS sends a pulsing signal to the PCM. The PCM then converts this signal into miles per hour by monitoring the time interval between pulses. PCM uses this sensor input in controlling Torque Converter Clutch (TCC) engagement, shift speed, etc.

Fig 1: Locating Vehicle Speed Sensor
G00058883Courtesy of GENERAL MOTORS CORP.
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