Multimode manual transmission (MMT) is an automated transmission used on some Toyota models. It can operate in both automatic and manual modes. It debuted in 2006. It helps save fuel, improves the vehicle’s performance, and ensures comfortable driving without having to switch gears constantly.
How it works
The Multimode manual transmission (MMT) is built on the basis of a manual gearbox. It features one clutch, which is engaged and disengaged by an electric motor. Thanks to this, there is no need to constantly press the clutch pedal. Another two electric motors are responsible for operating the gear shifting mechanism.
This gearbox is able to run in three modes: automatic (E), sport (Es), and manual (M). The first is designed for calm and comfortable driving. The second ensures faster shifting and thus, better dynamics. The third mode allows the driver to decide which gear to engage and when.
In manual mode, gear-shifting is performed using the gear lever. The driver shifts gear up or down by pushing the lever to the “M+” or “M-” position. Some versions feature paddle shifters for faster gear-shifting.
Popular MMT transmissions
| Gearbox code | Manufacturer | Number of gears | Max engine capacity, L | Max torque, N·m | Car layout | Production start | Model applications |
| C53A | Toyota | 5 | 1.4 | 200 | FWD | 2007 | Yaris XP90 |
| C50A | Toyota | 5 | 1.6 | 160 | FWD | 2006 | Corolla E150; Auris E150 |
Common malfunctions of MMT transmissions
| Malfunctions | Transmissions |
| Malfunctions caused by firmware errors. | C53A |
| The clutch assembly has a short lifespan. | С50А; C53A |
| The electromechanical actuators of the gearbox break down early. | C53A; С50А |
Comment