Everything You Need To Know About

6-7 SPEED MULTITRONIC
AUTOMATIC GEARBOXES

Gearbox 4 - 01J - 0AN 7 Speed Multitronic -motion

Everything You Need To Know About

6-7 SPEED MULTITRONIC
AUTOMATIC GEARBOXES

automatic gearbox for vag group
automatic gearbox for vag group

WHAT IS MULTITRONIC?

Normal automatic gearboxes work in largely the same way, except the job of depressing the clutch and swapping the ratios around is taken care of by the car. A continuously variable transmission also works automatically to alter the speed of the wheels in relation to the engine, but instead of using a box full of gears, it has a pair of pulleys – which is why it is referred to as a transmission, rather than a gearbox.

CVT (continuously variable transmission) gearbox allows the wheels to rotate at various speeds, without altering the engine speed. To simplify that, imagine two gears connected by a chain, as you would on have a bicycle. The gear connected to the pedals is half the size of the one at the rear wheel. For every full rotation of the pedals, the wheel would rotate half a turn.

You would travel slowly, but the pedals would be easy to move. Swap that around so that the pedal gear is now double the size of the wheel gear. For every full turn of the
pedals, the rear wheel would turn twice. It would be really hard to set off, but once moving you could achieve high speed. That’s exactly how it works in a car.

A conventional manual gearbox will have five or six gear ratios, with the lower set useful for low speed – pulling away from junctions or climbing hills – and the higher ones for cruising on the motorway at low engine rpm.

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THE MOST COMMON ISSUES WITH

MULTITRONIC GEARBOX

Broken TCM connections

Between sensors and motherboard hidden inside TCM we can find loads of connections. Unfortunately with extreme heat and vibrations they will break at some point. Causing flashing PRNDS lights on the dashboard.

Transmission Control Module (TCM)

The continuously variable transmission is electronically controlled as there are no gears and as such, the module that controls it can cause a myriad of problems. One of the best indicators that the electronic TCM has gone south is that the PRND indicators will start flashing. This isn’t the easiest part in the world to replace, but it can be done with a little bit of work and mechanical knowledge.

Broken output shaft

Common fault to cars with engine 2.0 or bigger. Output shaft cannot by bought separately therefore whole gearbox need to be replaced. Good indication of that fault is juddering when taking off either forward or reverse.

6-7 SPEED MULTITRONIC AUTOMATIC GEARBOXES

Slow Response or Hesitation Moving From a Dead Stop is "Normal"

The CVT does not offer the same initial torque delivery of a traditional automatic. These transmissions make the car feel a bit under powered when taking off. You may feel a hesitation or a slow throttle response from the stop lights, but that is likely because you aren’t feeling that characteristic shifting from first to second, and on up. Once you get up to speed, you will notice a much smoother ride.

Multitronics Automatic Gearbox repair and replacement starts from £1250

Other typical issues with
6-7 SPEED MULTITRONIC

Burned clutch friction plates.
Damage to drive pulley done by chain.
Broken drive chain.

HOW TO FIND OUT WHAT IS GOING ON WITH YOUR MULTITRONIC

Jerky car at take off, clutch slip or waving RPM
All of those signs are related to gearbox pressure. Lose of pressure might start a chain reaction of faults and problems. For example if there is not enough pressure build in because pump is not performing properly or output shaft is cracked/broken, CVT gearbox will not be able to work properly. You might experience juddering, slip of the chain or even lose of drive. At that stage friction plates will get damaged and oil contaminated with metal swarf.

One advantage to both SMTs and dual-clutch transmissions is the ability to perform matched-rev downshifts. When a driver selects a lower gear, both types of transmission disengage the clutch(es) and rev the engine to the exact speed required by the selected gear.

Not only does this make for a smoother downshift, but in the case of the twin-clutch transmission, it allows plenty of time for the proper gear to be pre-selected.

Most, though not all, dual-clutch transmissions can skip gears when downshifting, such as shifting from 6th gear directly down to 3rd gear, and because of their ability to match revs, they can do so without the lurching or surging that is typical of traditional automatic and manual transmissions.

EXPERT TIP ON DRIVING A CAR WITH A TWIN-CLUTCH, KNOWN AS DSG TRANSMISSION

Twin-clutch equipped cars do not have a clutch pedal. The clutch is engaged and disengaged automatically. Most twin-clutch transmissions use an automatic-style shift selector with a traditional P-R-N-D or P-R-N-D-S (Sport) shift pattern.

In “Drive” or “Sport” mode, the dual-clutch transmission operates like a regular automatic. In “Drive” mode, the transmission shifts to higher gears early in order to minimize engine noise and maximize fuel economy, while in “Sport” mode, it holds the lower gears longer in order to keep the engine in its powerband. Sport mode also provides more aggressive downshifts with less accelerator pedal pressure, and in some cars, engaging Sport mode causes the car to react more aggressively to the accelerator pedal.

Most dual-clutch transmissions have a manual mode which allows manual shifting via the shift lever or paddles mounted on the steering wheel.

When driven in manual mode, the clutch is still operated automatically, but the driver controls which gears are selected and when. The transmission will follow the driver’s commands unless the selected gear would over-rev the engine, for example commanding first gear while driving 80 MPH.

6-7 SPEED MULTITRONIC AUTOMATIC GEARBOXES

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