Vehicle Speed Sensor: Description and Operation
VSSDescription
The vehicle speed signal is sent to the "unified meter and A/C amp." from the "ABS actuator and electric unit (control unit)" by CAN communication line. The "unified meter and A/C amp." then sends a signal to the ECM by CAN communication line.
ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from "unified meter and A/C amp.", and the other is from TCM (Transmission control module). ECM uses these two signals for engine control.