Chrysler laser 1990 Technical Information Manual page 134

VEHICLE SPEED SENSOR
Vehicle speessensor
Vehicle speed sensor
1 revolutton
Vehicle
speed km/h (mph)
FUEL SYSTEM - Sensors
The vehicle speed sensor is a reed switch type sensor and is
installed in the speedometer. It converts the transmission
speedometer driven gear revolutions (vehicle speed) to pt
signals and sends them to the engine control unit.
The sensor generates four pulse signals for each rotation of the
speedometer driven gear.
I
Therefore, the sensor output frequency increases in proportion
to the vehicle speed as shown at the left.
1
Engine control unit
speed sensor