Circuit Description
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Transmission input speed sensor consists of a permanent magnet surrounded by a coil of wire. Rotation of forward clutch housing induces an AC voltage in circuit. Signal voltage and frequency vary with forward clutch rotational speed. VCM converts AC voltage into digital signal. AC voltage level increases as turbine shaft speed increases. VCM determines actual turbine speed using digital signal. VCM uses input speed to calculate torque converter slip speed and gear ratios. P0716 will set if VCM detects an unreasonably large change in input speed in a short period of time.