Multi mode transmission MMT Toyota Corolla
The Multi-Mode Transmission (MMT) in the Toyota Corolla is an automated manual transmission that combines elements of both manual and automatic gearboxes. It provides the convenience of an automatic with the option of manual gear shifting. Toyota developed this transmission to improve fuel efficiency and offer a more engaging driving experience, mainly used in some European and Asian markets.
Key Features of Toyota’s Multi-Mode Transmission (MMT)
- Automated Clutch Control: MMT operates with a manual gearbox but features an automated clutch, so there’s no clutch pedal. The transmission automatically manages clutch engagement, allowing for smoother shifts without the driver manually controlling the clutch.
- Manual and Automatic Modes:
- Automatic Mode: Functions similarly to a traditional automatic transmission, with shifts managed by the vehicle’s control unit.
- Manual Mode: The driver can control gear shifts using the gear selector or paddle shifters, if equipped.
- Fuel Efficiency: The MMT system is designed to deliver better fuel economy compared to traditional automatics, as it reduces drivetrain losses by using a manual transmission with automated controls.
- Lightweight Design: Since it’s essentially a manual transmission with electronic controls, MMT is lighter than conventional automatic transmissions, helping improve efficiency.
Common Issues with MMT
- Jerky Shifts: Some drivers report jerkiness or hesitation, especially at lower speeds. This is often due to the way the system engages the clutch.
- Clutch Wear: MMT can lead to faster clutch wear because of its automated clutch engagement, particularly in stop-and-go traffic.
- Actuator Problems: The clutch actuator, which is responsible for engaging and disengaging the clutch, can sometimes fail or become unresponsive.
Troubleshooting and Maintenance Tips
- Regular Software Updates: Dealerships may have software updates that improve shifting smoothness and responsiveness.
- Clutch Adjustment and Calibration: Periodic calibration of the clutch actuator can improve shift quality. Some dealerships can perform recalibration or reset procedures for smoother operation.
- Driving Technique: In manual mode, easing off the accelerator during gear shifts can reduce the jerkiness. This technique helps the transmission engage more smoothly.
- Avoid Stop-and-Go Driving: Minimizing excessive stop-and-go driving can help extend the life of the clutch and actuator components.
Replacement and Repairs
If MMT components (like the clutch actuator) fail, repairs can be costly due to the electronic nature of the system. Regular maintenance and early troubleshooting are essential to prolong its life.
Overall, the MMT in the Toyota Corolla is a unique transmission option for those seeking a blend between manual control and automatic convenience, although it may require specific driving adjustments and maintenance attention for optimal performance.