1999-2003 of release
Repair and operation of the car
Subaru of Legasi, Autbek
+ Cars Subaru Legacy, Outback
+ Operation manual
+ Routine maintenance
+ Cooling systems, heating
+ Power supply system and release
+ Electric equipment of the engine
+ Manual box and differential
- Automatic transmission
Electrohydraulic control system - the general information, purpose of basic elements
System of self-diagnostics - the general information and the principles of functioning
Diagnostics of the general condition of AT
Problem diagnostics of AT
Removal and installation of transmission assembly
Replacement of elements of a suspension bracket of transmission assembly
Replacement of an epiploon of a casing of lengthening of AT
Check of a state, adjustment and replacement of the sensor switch of permission of start
Removal and installation of the forward sensor of the speed (VSS)
Removal and installation of the back sensor of the speed (VSS)
Removal and installation of the sensor of turns of the turbine of the hydrotransformer
Removal, service and installation of valvate assembly
Replacement of electromagnetic valves of switching, executive electromagnetic valves and sensor of temperature of ATF
Replacement of the ATF filter
Removal and installation of the module of management of transmission (TCM)
Removal, installation and check of a condition of lines of a path of cooling of ATF
Removal, service and installation of components of the lever of the AT selector
Removal, installation, check of a state and adjustment of a driving cable of the AT selector
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
General information and principles of functioningThe scheme of an arrangement of transmission in a motive compartment
Design of AT of MRT-models
Design of AT of VTD models
This Head is devoted to the automatic transmission (AT). Information on RKPP is provided to the Head the Manual box and differential.
In view of complexity of a design of AT, absence on free sale of necessary replaceable internal components and need of use of the special equipment, authors of the present manual do not recommend to owners of cars to carry out capital repairs of AT independently. Repair of AT in the conditions of a workshop of car service is rather expensive operation, in a type of that, it is necessary to consider alternative options of replacement of the failed block new or restored. Any useful information on repair and replacement of transmission can be received at car repair shops of the Subaru company.
Regardless of the chosen way of introduction of the refused AT to action, independent performance of its removal and installation will help to cut down substantially expenses (before make sure that transmission really needs recovery repair).
In the present Chapter only procedures of diagnostics of the general refusals of AT, its routine maintenance, the main adjustments, removals and installations are considered. The scheme of an arrangement of transmission in a motive compartment is submitted on an illustration.
The considered models of cars are supplied with one of two AT types. The first type is intended for a complete set of models without system of adjustable distribution of a torque (VTD), called also by the MPT models (models with multidisk transfer). Other type is established on model with VTD. Both AT types have the design of the constant all-wheel drive uniting in itself, hydrotransformer/coupling section, section of a terminal reducer, and also transmission and distributing sections.
Transmissions of both types
Electronic control transmissions of both types is exercised by the special module called by the module of management of transmission (TCM). TCM represents the microprocessor assembly controlling functioning of the operating electromagnetic valves and other electric and electrohydraulic devices taking into account influence of many entering variables (extent of opening of a butterfly valve, speed of the movement of the car, engine turns, the chosen AT range, etc.). On the basis of the analysis of the arriving information of TCM carries out a choice of transfer, optimum for the current conditions, and determines the most suitable scheme of distribution of power (including braking by the engine and coupling inclusion blocking).
Except described above, TCM carries out additional function of an automatic choice of one of two control modes: "Basic" (Base) and Increased Return Capacities mode (Power). The choice carries out according to a manner of driving of the driver which TCM defines proceeding nature of management of a gas pedal. Usually basic mode is used at the movement on the equal road while the most typical conditions of activation of the Power mode are sharp accelerations and the movement uphill.
One more feature of the considered transmissions is possibility of implementation of manual deduction of AT on the chosen transfer, - at the correct use this function allows to achieve increase of controllability of the vehicle and comfort of the movement.
Efficiency of transfer of power, and economy of fuel consumption are reached due to use of the converter of rotation with the hydraulic blocking coupling and applications of the reduktorny assembly with two sets of planetary mechanisms providing possibility of a choice of four lobbies and one back transfers.
The self-diagnostics block is a part of TCM that considerably increases reliability of functioning of transmission and facilitates search of causes of failures.
Transmission like MPT
The design of AT of MRT-models is presented on an illustration.
In this design are used both the structural, and operating means of ensuring of absence of stress of switchings. The Obgonny coupling and three accumulators effectively absorb pushes while completely electronic control by switching of forward transfers in combination with control of pressure in lines and management of blocking of the hydrotransformer is minimized by probability of pushes and breakthroughs when switchings transmission.
The increased AT case durability in combination with application of the double-thread cable of the mechanism of gear shifting which is poorly transferring vibrations, provides a low noise background of functioning of transmission.
The structure of assembly of AT established on the MRT model includes the hydraulic control unit of the drive of back wheels. The block is located in back part of transmission section AT and consists of the electromagnetic valve of the running cycle regulating the hydraulic pressure attached to the managing director of the drive of back wheels to the coupling of multidisk coupling of damp type.
The set of the parameters determining the size of the torque transferred by the distributing coupling is stored in memory of the module of management of transmission (TCM). Based on the analysis of the data arriving from the corresponding information sensors (speed of the movement of the car, extent of opening of a butterfly valve, the chosen AT range, pro-slipping of wheels, etc.), TCM chooses suitable working coefficient of control of the electromagnetic valve regulating the hydraulic pressure enclosed to the distributing coupling providing transfer of the corresponding torque to the drive of back wheels of the car from memory.
Accurate control of control of the drive of back wheels from TCM is especially effective at prevention of the undesirable braking moments arising at commission of abrupt turns at a small speed of the movement.
At activation the ABS module of management of transmission provides increase of efficiency of braking by means of adjustment of a torque transmission on back wheels and control of compliance to the chosen transfer of speed of the movement.
Transmission like VTD
The design of AT of VTD models is presented on an illustration.
Completely automatic, operated by electronics four-stage AT established on the VTD model has designation of E-4AT. The interaxal differential of this all-wheel drive (AWD) transmission is equipped with system of distribution of the power of Subaru combining recently developed planetary reducer of the mixed type with the mechanism of restriction of slipping (LSD) operated by electronics.
The interaxal differential distributes a torque between lobbies and back wheels in the ratio 45.5: 54.5 thanks to ability of the mixed planetary reducer to distribution of a torque. This ratio was defined more for reasons of increase of smoothness of passing of turns (that demands optimization of distribution of forces of lateral reaction arising between protectors and a paving), than for the purpose of improvement of force of adhesion of tires (that demands optimization of distribution of dynamic loadings). Dynamic control of change of a basic ratio is exercised thanks to application to the mechanism of restriction of slipping of differential. Adjustment is carried out in the range from the basic value determined by the transfer relation of planetary assembly to the value reached at the time of a suspension of functioning of differential. Functioning of system of regulation of distribution of a torque between lobbies and back wheels promotes increase of controllability of the vehicle, providing high stability of the course of the car even in extreme conditions.
At operation of ABS TCM exercises control of functioning of the device of restriction of slipping of interaxal differential how the module of management of system of anti-blocking of brakes controls functioning of brake mechanisms.
Summarizing told, it is possible to note that transmissions of E-4AT differ in high stability of functioning and simplicity in operation.
Purpose of working ranges of AT
Gets out at a car parking. In this situation, in transmission all elements of management are switched off, and its output shaft is blocked, - the movement of the car is impossible. It is necessary to transfer the selector to situation "P" only after a full stop of the vehicle. Attention: Transfer of the selector to situation "P" during the movement can lead to a transmission exit out of operation!
Backing. It is possible to transfer the selector to a R position only after a full stop of the vehicle. Attention: Inclusion of a reverse gear during the movement of the car can lead to a transmission exit out of operation!
Neutral situation. In a box all elements of management that provides lack of rigid kinematic communication between her leader and conducted by shaft are switched off. The mechanism of blocking of an output shaft thus is switched off, i.e. the car can freely move. It is not recommended to switch transmission in the situation "N" at the movement by a setup. Attention: Do not switch off ignition at the movement under a bias at all!
Main mode of the movement. Provides automatic switching with the first on the fourth transfer. It is recommended at the movement in normal conditions.
The movement on the first three transfers is authorized. It is recommended to use at the movement on the hilly road or in the conditions of frequent stops (an intense city cycle).
The movement only on the first and second transfers is authorized. It is recommended to use, for example, on twisting mountain roads. Switching on the third and fourth transfers is forbidden. On this range the braking mode is effectively used by the engine.
The movement only on the first transfer is authorized. This range allows to realize as much as possible the braking mode the engine. It is recommended at the movement on abrupt descents, rises and off road terrain.