LEXUS RX 300

1998-2003 of release

Repair and car operation



Лексус RX 300
+ Cars Lexus RX-300
+ Controls and operation receptions
+ Options and car routine maintenance
+ The engine
+ Systems of cooling of the engine, heating, ventilation and air conditioning
- The power supply system and release of the fulfilled gases
   - The power supply system
      The general data and security measures
      Сбрасывание pressure in fuel system
      Principle of functioning of a control system of fuel injection
      Checks of system of injection
      Removal and installation of the fuel pump, the gauge of a stock of fuel and regulator of pressure of fuel
      Removal and installation of fuel distributive highways and injectors
      Removal and installation of a fuel tank and fuel lines
      Removal and air cleaner installation
      Removal, installation and adjustment of the case of a throttle and gauge TPS
      Removal and installation of components of system ACIS
   + Systems of release and decrease in toxicity of the fulfilled gases
+ Systems of an electric equipment of the engine
+ Automatic transmission and interaxal differential
+ Трансмиссионная a line
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Basic schemes of electric connections


Principle of functioning of a control system of fuel injection

The general information

Fuel is sucked in from a fuel tank by the electric fuel pump and moves through the fuel filter to a fuel distributive highway. The pressure regulator provides pressure maintenance in fuel system in a range 3.0 3.4 атм.

Through electrooperated injectors fuel импульсно is injected into the inlet pipeline located directly ahead of inlet valves of the engine. The engine management block makes consecutive management of injectors according to ignition order, regulates injection time and by that quantity of injected fuel.

Air necessary for formation of a fuel mix, is sucked in by the engine through the air filter and arrives through throttle заслонку, воздухораспределитель and the inlet pipeline to inlet valves. The quantity of soaked up air is regulated throttle заслонкой. The volume of soaked up air is defined by a measuring instrument of quantity of air (MAF), located on an air cleaner cover.

The engine management block is in the bottom right part of the panel of devices. The management block defines optimum time of ignition, the moment of injection and quantity of injected fuel. Thus there is a coordination of work of the block of management with other systems of the car.

The information from other gauges and the operating pressure arriving to executive powers, provide optimum work of the engine in any situation. If some gauges fail, the management block is switched in a mode of the emergency program to exclude possible damage of the engine and to provide the further movement of the car.

The short description of principles of functioning of some of gauges and actuation mechanisms of a control system of the engine

The gauge of position throttle заслонки (TPS) is built in in the executive mechanism throttle заслонки and gives out on the management module (ECM) the information on current coal of position throttle заслонки. The second potentiometer informs ECM data on base value and forms duplicating signal at failure of a potentiometer throttle заслонки.

The gauge of position of a cranked shaft (CKP) is established on the block of cylinders at a flywheel. It transfers to the block of management the information on number of turns of a cranked shaft and a finding of the piston of the first cylinder in ВМТ.

The gauge of position of a camshaft (CMP) is located in an end face of a cover of a head of cylinders. It together with the gauge of position of a cranked shaft transfers to the block of management the information about ВМТ the piston of the first cylinder. It serves for synchronisation of the moment of ignition and sequence of ignition.

The gauge of temperature of a cooling liquid (ECT) is located in a reception branch pipe of system of cooling (illustrations Components of installation of the thermostat and Site Д/В №1 and №2 ECT see). It represents the resistor with the negative temperature factor which resistance decreases with temperature growth.

The gauge of measurement of weight of air (MAF) represents термоанемометрический the measuring instrument which has been built in in an inlet air path of the engine. In the measuring instrument case the warmed touch film cooled by the passing stream of soaked up air is located thin, электрически. The electric current which is heating up a film, is regulated by a control system so that to maintain temperature a constant film. If, for example, the quantity of soaked up air increases, the temperature of a heated up film starts to decrease. Thus the electric current size increases at once to keep temperature of a plate invariable. Electric current fluctuations specify to the engine management block in its loading that allows to define quantity of injected fuel correctly. The information given out by the gauge is used ECM at definition of parametres of a dosage of an air-fuel mix.

The detonation gauge (KS) is rolled directly in the block of cylinders and serves for prevention of occurrence of dangerous shock combustion of a fuel mix, allowing to keep installation of the moment of ignition on detonation border when efficiency of return of the engine is supported on a maximum level at the minimum expense of fuel.

The system of ventilation of a fuel tank/catching of fuel evaporations (EVAP) consists of a coal adsorber and the electromagnetic valve of management of a purge of the last. In an adsorber steams of fuel formed as a result of its heating accumulate. At engine work the fuel evaporations which have accumulated in an adsorber are extended in an inlet path and go to combustion chambers.

Ljambda-probes measure the oxygen maintenance in the fulfilled gases (ОГ) before and after каталитических converters and transfer corresponding signals in the engine management block.





7bd329e4