B Series Truck 4WD L4-2606cc 2.6L SOHC (1992)
Vehicle Speed Sensor: Description and Operation
The vehicle speed sensor, located in the speedometer head assembly, consists of a contact set and magnet that turns with the speedometer cable. Magnet
movement causes the contacts to alternately open and close four times per cable revolution. Switching action frequency is interpreted by the ECU as
vehicle road speed.
