Summit Wagon FWD L4-1795cc 1.8L SOHC (1994)
Vehicle Speed Sensor: Description and Operation
Vehicle Speed Sensor Circuit
PURPOSE
The engine control module (ECM) uses this signal to determine idle speed control, etc..
OPERATION
The vehicle speed sensor is a magnetic reed type switch.
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As the speedometer cable turns, the switch turns ON and OFF (opening and closing the circuit) generating a pulsed a signal to be interpreted
by the ECM as vehicle speed.
