Toyota Land Cruiser 100 / Amazon, Lexus LX 470

Since 1997 of release

Repair and car operation

Automatic transmission (АТ)

The general information

For a complete set of models considered in the present Management one of two types of 4-step automatic transmissions (with raising transfer) can be used: А343F and А440F, and since 2002 вып. – 5-step АТ. All transmissions are equipped by the blocked converter of rotation (hydrotransformer). The converter provides direct coupling between the engine and car driving wheels.

In view of complexity of design АТ, absence on free sale of replaceable internal components, and also necessity of use of the special equipment, composers of the present Management do not recommend to owners of cars to carry out transmission major repairs by own forces. In the present Chapter procedures of diagnostics of general refusals АТ, its routine maintenance, the basic adjustments, removal and installation are considered only.

Sometimes, in case of serious breakage to replace transmission more reasonably and easier, than to waste time and means for restoration of the failed assemblage. Without dependence from the chosen way of introduction refused АТ in action, independent performance of its removal and installation expenses (before make sure that transmission really requires regenerative repair) will help to cut down substantially.

Functioning principle

Assemblage typical АТ

Automatic transmission consists of the hydrotransformer with blocking муфтой, a raising planetary number, a transmission, a distributing box and a control system which structure includes hydraulic and electronic parts (address to an illustration above).

Planetary assemblage of transfers consists of two planetary numbers. The structure of a distributing box includes a planetary number with frictional elements of management (blocking муфта and a brake). Work of all transmission the electronic block of management operates. Switching of high-speed modes is made by means of the car established in salon selector growling. The selector by means of a cable is connected with клапанной assemblage, and with its help it is possible to set a range of used transfers. Besides the selector in salon for the task of special modes of functioning of transmission some switches are provided.

For prevention of breakages АТ at a wrong choice of a high-speed range, for example, moving from «D» in «R» on the selector lever the clamp is provided, – "dangerous" switchings can be carried out only at the pressed button of a clamp. The selector lever can be established in one of six fixed positions: «Р», «R», «D», «N», «2» and «L», appointment of each of which is considered more low.

Position «Р»

Gets out at a car parking. In this position, in transmission all elements of management are switched off, and its target shaft is blocked, – car movement is impossible. To translate the selector in position «Р» follows only after a full stop of a vehicle.

Position «R»

Backing. To translate the selector in a position «R» it is possible only after a full stop of a vehicle.

Position «N»

Neutral position. In a box all elements of management that provides absence of rigid kinematic communication between its conducting and conducted shaft are switched off. The mechanism of blocking of a target shaft is thus switched off, i.e. the car can freely move. It is not recommended to switch transmission in position «N» at movement накатом.

Position «D»

The basic mode of movement. Provides automatic switching with the first on the fourth transfer. It is recommended at movement in normal conditions.

Position «2»

Movement only on the first and second transfers is authorised. It is recommended to use, for example, at movement on twisting mountain roads. Switching on the third and fourth transfers is forbidden. On this range the mode of braking is effectively used by the engine.

Position «L»

Movement only on the first transfer is authorised. This range allows to realise as much as possible a mode of braking by the engine. It is recommended at movement on abrupt descents, liftings and impassability.

Mode «OD»

The permission to use of the fourth, raising, transfers is carried out by means of special button "OD". If the button is in the drowned condition and the lever is established in position «D» switching on raising transfer is authorised. Otherwise inclusion of the fourth (raising) transfer is forbidden. The control system condition in this case is defined on a control lamp «O/D OFF». In case of the permission of raising transfer the indicator does not burn, at an interdiction, burns. The mode is used at movement with constant speed on direct sites of a highway. It is necessary to avoid use of mode O/D in city conditions, especially in a winter season when braking by the engine gets the vital value. It is not necessary to include also a mode of raising transfer at a car total load.

Special programs

On cars with АТ it is put two control modes by a gear change: "economic" (NORMAL) and "sports" (POWER). The choice is carried out by means of the special switch which has been built in in the central console of the car.

Economic mode (NORMAL)

In the given mode the minimum expense of fuel takes place. Gear changes occur in the middle of corresponding ranges of the engine, character of movement of the car quiet, smooth.

Sports mode (POWER)

At inclusion of the given mode on the panel приоров the control lamp «ECT POWER» lights up. In the given mode there is a maximum selection of capacity of the engine, box switching is made in the top border of corresponding ranges of turns of the engine. Приемистость the car substantially increases, the fuel expense, accordingly, increases.

Planetary transmission

Into structure of a planetary transmission enters three planetary numbers, three blocking муфты, four brakes and three муфты a free wheeling.

Capacity from the engine through the hydrotransformer is transferred to an entrance shaft of a planetary transmission.

The gear change is carried out by inclusion of a certain combination of brakes and муфт a free wheeling therefore frequency of rotation of a target shaft changes.

One more planetary number, two blocking муфты and one brake the distributing box contains.

The device of a hydraulic part of a control system

Transmission

The hydraulic part of a control system consists of the oil pump, клапанной assemblages, electromagnetic valves, муфт and brakes, and also the channels connecting among themselves listed elements. Pressure of a working liquid created by the pump is used for management of frictional elements of transmission, hydrotransformer and greasing feed. In клапанной to assemblage three electromagnetic valves of switching are established. With their help the electronic block exercises administration of a gear change and hydrotransformer blocking.

Distributing box

Into structure of a hydraulic part of a control system of a distributing box enter: клапанная a box, the electromagnetic valve № 4, a brake (В4), two blocking муфты (СЗ, С4), and also the channels connecting among themselves listed elements (address to an accompanying illustration). Box appointment – management of a planetary number which can be carried out or manually, or automatically electronic block.

Assemblage of a distributing box is presented on an illustration more low.

Assemblage of a distributing box

Electric part of a control system

The electric part operates a gear change in a transmission and a distributing box, and also blocking муфтой the hydrotransformer. It consists of three parts: gauges of speed of movement of the car (VSS), the gauge of position throttle заслонки (TPS) and the other information gauges tracing parametres of a condition of transmission and transferring given ECM (the electronic block of management); ECM which on the basis of the analysis of the data arriving to it defines the switching moments in a transmission and a distributing box, and also operates blocking муфтой the hydrotransformer; and the executive part consisting of four electromagnetic valves.