Sentra L4-1597cc 1.6L DOHC MFI (GA16DE) (1991)
Vehicle Speed Sensor: Description and Operation
Vehicle Speed Sensor
The vehicle speed sensor, located in the speedometer head, used for needle type gauges is a magnetic reed switch that rotates in conjunction with
the transmission output shaft. It signals the ECU in open/closed terms. The ECU interprets the speed at which the open/closed signals are
conducted into vehicle speed.