Electronic Control Transmission (ECT) - Autoshop 101

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The sensor can also be a photocoupler type which uses a photo transistor and light-emitting diode (LED). The LED is aimed at the phototransistor and separated by a slotted wheel. The slotted wheel is driven by the speedometer cable. As the slotted wheel rotates between the LED and photo diode, it generates 20 light pulses for each rotation.

  Transmissions, Photo, Transistor, Phototransistor, Photocoupler, Phototransisto r