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Vehicle Speed Sensor

The Vehicle Speed Sensor (VSS) is a Permanent Magnet (PM) generator mounted in transmission. See Fig 1 or Fig 2 . 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 (AWD Astro & Safari)
G00101479Courtesy of GENERAL MOTORS CORP.
Fig 2: Locating Vehicle Speed Sensor (Except AWD Astro & Safari)
G00101478Courtesy of GENERAL MOTORS CORP.
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