K313: A Very Simple Little CVT
Last month we removed the pump from the main case and looked at its unique design. Looking back at the transmission with the pump removed, the forward clutch drum assembly comes into view. The outer lugs on the drum are used to excite the turbine shaft speed sensor. The rpm signal from this sensor can be compared to the engine rpm signal to monitor converter clutch apply. Like a conventional transmission, when the clutch is fully applied, both values should be identical.
Toyota’s K313: Examining hydraulic system
We left off last month having already pulled the valve body from this little Toyota CVT unit. Once the valve body is removed, the 2-wire Hall-Effect turbine-shaft speed sensor (NT) can be seen bolted to the case where it reads the rotation of the forward clutch drum assembly.
Toyota’s K313 Continuously Variable Transmission
In 2014, Toyota introduced the K313 Continuously Variable Transmission in their 1.8L Corollas vehicles. It utilizes a torque converter eliminating a forward or reverse clutch-release strategy when in gear at a complete stop. The torque converter neck is a double-ear drive design that indexes into the inner pump gear.
