The Toyota Corolla Speed Sensor is responsible for monitoring the rotation of the transmission output shaft of your car. It transmits the movement as a speed signal to the car's computer. The Speed Sensor feeds the control module with speed data so that it can establish shift timing, line pressure, and torque converter clutch engagement in the Corolla transmission for smooth and correctly timed shifts. The Speed Sensor generally works on the principle of magnetic interaction, and the common designs applied on Toyota Corollas include a permanent magnet unit that creates a variable voltage as teeth pass its tip and a reed style unit that opens and closes its internal contact to generate pulses. The Speed Sensor output influences how the computer initiates shifts and the feel of the shifts regardless of design. When a Toyota Corolla loses or has an erratic signal from the Speed Sensor, this could cause improper or delayed upshifts, particularly firm shifts, or no torque converter clutch operation.
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