Colt L4-1795cc 1.8L SOHC (1994)
Vehicle Speed Sensor: Description and Operation
OPERATION
The vehicle speed sensor, which is located in the speedometer, converts the vehicle speed into a pulse signal and inputs it to the engine control
module, which then provides the idle air control, etc., based on this signal.
The vehicle speed sensor generates the vehicle speed signal by repeatedly opening and closing between the voltage of about 5V applied from the
engine control module and ground using a reed switch.