Speed Sensor (Transmission)
Illustration Transmission speed sensor
The transmission speed sensor receives power from the Power Train Electronic Control Module (Power Train ECM). The transmission speed sensor uses this current and power in order to send a signal to the Power Train ECM. The gear for the transmission speed sensor has 120 teeth. The gear for the transmission speed sensor is connected to the transmission output shaft.
The speed of the teeth will determine the signals that are sent by the transmission speed sensor to the Power Train ECM. This informs the Power Train ECM of the ground speed of the machine. This information and the information from the shift lever switch allow the transmission to automatically shift while the ground speed changes. The transmission will automatically shift until the information from the transmission gear switch signals the Power Train ECM to stop automatic shifts.
Usually, the transmission will not shift into a higher speed than the speed that is selected on the transmission control. During overspeed conditions, the transmission will upshift by one gear or the transmission will unlock the torque converter.
When the signals from the transmission speed sensor indicate a downshift, the Power Train ECM will automatically downshift.
