Fluid - CVT: Service and Repair
ATF, checking and changing (Continual Variable Transmission (CVT) 01J)
Special tools and equipment
- VAS 5051 with VAS 5051/1
- ATF filling device for CVT transmission VAS 5162
- Drip tray
- Protective goggles
ATF level, checking
CAUTION!
The Multitronic 01J transmission needs a different ATF to that used in multi-step automatic transmissions. Only the ATF which is available as a replacement part and specifically intended for the CVT transmission should be used in the planetary transmission.
Note:
- The top left illustration on the reservoir of the filling device VAS 5162 indicates that only special ATF can be used for the CVT transmission.
- The other illustrations show how to fill the transmission. The necessary steps are described below.
CAUTION!
The engine must not be started if there is only very little or no ATF in the transmission, e.g. following repair work or if a large amount of ATF has been discharged.
If this is the case, the transmission must first be filled with 4.5 to 5 liters of ATF
Test requirements:
- Transmission must not be in emergency running mode.
- Vehicle must be on a flat surface.
- Vehicle diagnostic, testing and information system VAS 5051 must be connected. Vehicle self-diagnosis and vehicle system "02 - Transmission electronics" must be selected.
- Engine must be idling.
- Air conditioner and heater must be switched off.
- When testing is started, ATF temperature must not be higher than 30°C. If necessary, allow transmission to cool down first.
Note:
- The ATF level changes as the ATF temperature increases/decreases.
- Checking the ATF level when the ATF temperature is too low will result in overfilling.
- Checking the ATF level when the ATF temperature is too high will result in under filling.
- Both overfilling and under filling will prevent the transmission from functioning correctly.
- The ATF temperature is read off at the vehicle diagnostic7 testing and information system VAS5051.
Reading ATF temperature
Indicated on VAS 5051:
- In list -1-, touch diagnostic tunction "08 - Reading measured value block".
Indicated on VAS 5051:
1 - Enter display group. Max. input value = 255
- Use keypad-2- to enter "010" for "Display group number 010" and confirm by touching 0 key.
Indicated on VAS 5051:
- Read off ATF temperature in display zone -3-.
- Check ATF level as soon as temperature of 30°C is displayed.
Checking ATF level Test requirements:
- Engine must be idling.
- Vehicle must be on a flat surface.
- Shift through all selector lever positions (P,1/D) with depressed brake pedal and let each position switch at idle engine speed for approx. 2 seconds.
- Raise vehicle.
- Loosen mounting parts -3- and -4- and remove rear part of noise insulation.
- Place container beneath transmission.
WARNING! Wear safety goggles.
- Once an ATF temperature of 35°C is reached, remove ATF check plug -B-.
Notes:
when opening the plug, approx. 5 cl ATF flows out first from the inner oil level pipe.
The ATF level is correct if, at an ATF temperature of between 35°. and 45° (For hot countries 50°C), a small amount of fluid is still discharged at the ATF inspection plug (owing to the rise in fluid level caused by increased temperature).
- Replace ATF check plug. 4
- Tightening torque: 20 Nm
Note:
ATF check plug must be closed again by 45° (For hot countries 50°C) at the latest
Add ATF if no ATF has exited from the ATF check plug hole by 40°C.
Filling up ATF
Requirement:
- Engine continues to run in idle.
- Attach full reservoir of ATF filling device VAS 5162 as high as possible on vehicle.
Note: The tap on the filling device VAS 5162 must be closed.
- Screw fitting on tap of filling device VAS 5162 into opening of ATF inspection plug -B-.
- Turn tap toward filling hose -bottom arrow-. ATF runs into transmission.
- Hold suitable container under outlet of filling device.
- Check ATF level by turning tap toward outlet bottom arrow-.
ATF level is correct if only a small amount ATF drips out of outlet before 45°C is read
Note:
Approx. 5 cl of ATF from the inner oil level pipe always discharged initially.
- If no further ATF is discharged, turn tap bad toward filling hose and pour in more ATF; check ATF level again.
- Remove tap when correct ATF level has been reached.
Note: A few drops of ATF will be discharged when tap is removed.
- Replace ATF check plug.
- ATF check plug -B- must be closed again by 45°C (For hot countries 50°C) at the latest.
- Tightening torque: 20 Nm
Note:
If the ATF temperature exceeds 45°C, too much ATF will be discharged as a result of the rise in temperature and the transmission will not be sufficiently filled!
- Quit "08 - Reading measured value block" function by touching <- key.
- Select "06 - End Output".
- Switch off ignition and disconnect diagnostic cable.
ATF, changing and topping up after repair work
Special tools and equipment
- Socket attachment 3357
- ATF filling device for CVT transmission VAS 5162
- Drip tray
Sequence of operations
CAUTION! Do not run the engine or tow the vehicle without adequate ATF
Note: Observe disposal regulations.
- Attach full reservoir of ATF filling device VAS 5162 as high as possible on vehicle.
Note: The tap on the filling device VAS 5162 must be closed.
- Raise vehicle.
- Loosen mounting parts -1- to -5- and remove noise insulation (2 parts).
- Place drip tray under transmission.
- Unscrew ATF drain plug -A- using socket attachment 3357 and drain off ATF.
- Tighten ATF drain plug to 24 Nm.
- ATF lines and ATF cooler, cleaning.
- Unscrew ATF inspection plug -B-.
- Screw fitting on tap of tilling device VAS 5162 into opening of ATF inspection plug -B-.
- Turn tap toward filling hose -bottom arrow-. ATF runs into transmission.
- Allow at least 4.5 to 5 liters of ATF to run into transmission.
- Shift selector lever to "P", start engine and allow it to run at idling speed.
- Check and top up ATF level.
Note: All the notes and test conditions given under "Checking ATF level" must be observed.