Blue Print offers readers of PMM a guide on replacing multi-mode transmission clutches. This sequential manual gearbox is made by Toyota and features in the following models: Toyota Auris 1.4 and 1.6, Aygo 1.0, Corolla 1.4 and 1.6, Yaris 1.0, 1.3 and 1.4, Citroën C1 1.0, Peugeot 107 1.0 1999-2014.
This guide relates to Blue Print parts ADT330265, ADT330266, ADT330274, ADT330278.
Instead of a conventional automatic transmission which uses hydraulics and a torque convertor, the MMT has a conventional friction clutch and mechanical gear selector mechanism which is controlled electronically. The most obvious way to identify whether a car is fitted with MMT, is the gear selector will have no transmission locking Park (P) position, as in Fig.1.
Note: Before removing an MMT gearbox for a clutch replacement you must first set the clutch actuator to the ‘clutch clamp’ position. Failure to carry out this operation is likely to cause the clutch actuator to be in the incorrect position on reassembly of the gearbox.
Clutch clamp position adjustment manual procedure (without diagnostic tool)
- Ensure the ignition is switched off, the gear selector is in the ‘N’ position and that the parking brake is applied.
Figure 2. - Use a jumper wire to connect terminals 4 and 13 of the 16pin OBD diagnostic socket as shown in fig. 2.
- With your foot OFF of the brake pedal, turn the ignition switch to the ON position.
- Pump the brake pedal (on>off) 7 times or more within a 3 second period.
- A buzzer should now sound twice with an interval of 0.25 seconds.
- Depress the brake pedal and hold it down.
- Keeping the brake pedal held down, now shift the gear lever in the following sequence:
- Release the brake pedal.
- Press and release the brake pedal one time. A buzzer should now sound once.
- Pump the brake pedal (on>off) 3 times or more within a 2 second period. A buzzer should now sound twice with an interval of 0.25 seconds.
Note: If the buzzer does not sound, turn the ignition OFF and wait at least 15 seconds before starting the process from the beginning again. - Depress the brake pedal and hold it down whilst shifting the gear lever into the ‘–’ position.
- Release the brake pedal.
- Turn the ignition OFF and wait at least 10 seconds.
- Disconnect the jumper wire from the 16 pin OBD diagnostic socket.
Note: After you have replaced the clutch you will have to initialise the MMT ECU and Clutch and perform the MMT system calibration.
The clutch is now in its clamped position and you can proceed with removing the transmission and replacing the clutch assembly.
Initialisation of the MMT ECU
(All learned and calibrated values and DTCs are cleared)
- Ensure the ignition is switched off and the gear selector is in the ‘N’ position.
- Re-connect the jumper wire as shown previously in figure 2.
- Wait at least 10 seconds and then turn the ignition to the ON position.
- Pump the brake pedal (on>off) at least 7 times within a 3 second period.
- A buzzer should now sound twice with an interval of 0.25 seconds.
Now you are ready to initialise the ECU… - Depress the brake pedal and hold it down.
- Keeping the brake pedal held down, now shift the gear lever in the following sequence:
- Release the brake pedal.
- Press and release the brake pedal one time. A buzzer should sound twice with an interval of 0.5 seconds. If the buzzer does not sound, turn the ignition OFF and wait at least 15 seconds before restarting the process from the beginning again.
- Pump the brake pedal (on>off) 3 times or more within a 2 second period. A buzzer should now sound twice with an interval of 0.25 seconds when initialising the ECU.
- Turn the ignition switch off and wait at least 10 seconds. (15 Seconds for Aygo 2012>)
- Disconnect the jumper wire from 16 pin OBD diagnostic socket.
Initialisation of the MMT ECU is complete.
Initialisation of the clutch
- Ensure the ignition is switched off and the gear selector is in the ‘N’ position.
- Re-connect the jumper wire as shown previously in figure 2.
- Wait at least 10 seconds and then turn the ignition to the ON position.
- Pump the brake pedal (on>off) at least 7 times within a 3 second period. A buzzer should sound twice with an interval of 0.25 seconds.
Now you are ready to initialise the clutch… - Depress the brake pedal and hold it down.
- Keeping the brake pedal held down, now shift the gear lever in the following sequence:
- Release the brake pedal.
- Press and release the brake pedal one time. A buzzer should now sound 3 times to confirm initialisation of the transmission. If the buzzer does not sound, turn the ignition OFF and wait at least 15 seconds before restarting the process.
- Pump the brake pedal (on>off) 3 times or more within a 2 second period. A buzzer should now sound twice with an interval of 0.25 seconds.
- Turn the ignition switch to OFF and wait at least 10 seconds. (15 Seconds Aygo 2012>)
- Disconnect the jumper wire from 16 pin OBD diagnostic socket.
Initialisation of the MMT clutch is complete.
MMT system learning
Performing this procedure will ensure that the initialised clutch position and/or gear position is stored.
- Ensure the ignition is switched off and the gear selector is in the ‘N’ position.
- Turn the ignition to the ON position and wait at least 40 seconds. (50 Seconds Aygo 2012>) You will hear the gear shift and selector actuator selecting gears.
- Turn the ignition to the OFF position and wait at least 15 seconds. (20 Seconds Aygo 2012>)
- Ensuring that the Shift lever is in the ‘N’ position, depress and hold down the brake pedal, turn the ignition on and start the engine. The shift indicator on the instrument panel should blink when the engine is started.
- Wait at least 10 seconds, checking that the shift ‘N’ position indicator has stopped blinking and is on continuously.
The MMT system learning is complete.
MMT system synchronisation and position calibration
The vehicle must now be road tested to allow the transmission to learn gear position and synchronisation. Drive the vehicle in the manual mode (gear position M) and move through all the gears leaving at least two seconds between changes. If after the synchronisation process the gear changes jolt or are not smooth, then perform the position calibration again.
