K 2500 Truck 4WD V8-393 6.5L DSL VIN P (1995)
Vehicle Speed Sensor: Description and Operation
With 4L80E Automatic Transmission
Vehicle Speed Sensor
DESCRIPTION
This device contains a permanent magnet surrounded by a coil of wire producing a magnetic field which is interrupted by rotor teeth pressed on
the output shaft. As the rotor interrupts the magnetic field, an AC voltage is generated in the circuit. This device is used to provide an output shaft
speed signal to the Powertrain Control Module (PCM). The PCM uses the vehicle speed sensor signal input to:
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Calculate vehicle speed, trans output speed, and Torque Converter Clutch (TCC) slip speed.
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Control shift quality.
