Prelude Type-SH L4-2157cc 2.2L DOHC H22A4 (VTEC) 16V (1998)
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Vehicle Speed Sensor: Description and Operation
With the ignition switch in ON (II) or START (III), battery voltage is supplied through fuse 14 and the BLK/YEL wire to the vehicle speed sensor
(VSS). The sensor is grounded by the BLK wire to G101. The speedometer and other control units in the circuit supply 5 Volts or more to the
BLU/WHT wire. The vehicle speed sensor (VSS) intermittently grounds the BLU/WHT wire which generates a pulsed signal in it. The number of pulses
per minute increases/decreases with the speed of the car.
