LEXUS RX 300

1998 - 2003 of launch

Repair and operation of the car

Beginning of functioning of a system of control of injection of fuel

General information

The fuel is sipped of the fuel tank by the electric bomb of fuel and movements distributive road was seeing the filter of fuel to the fuel. The regulator of the pressure supplies the maintenance of the pressure in the fuel system in the variety of 3,0 ÷ of 3.4 atm.

By the injectors fuel electrooperated the pulsewise is injected in the located entry oil pipeline justly before valves of entry of the motor. The unity of control of the motor does the consecutive management of injectors according to an ignition order, regulates the time of injection and for that amount of the intravenous fuel.

The air necessary for the formation of the mixture of fuel is sipped by the motor he was seeing the filter of air and it arrives for a butterfly valve, the air distributor and the oil pipeline of entry to introduce valves. The amount of the soaked air is regulated by a butterfly valve. The volume of the soaked air is defined by the instrument of measuring of the amount of air (MAF) located in a covering of purifier of air.

The unity of control of the motor is in the lowest right part of the panel. The unity of control defines the best time of the ignition, the moment of the injection and the amount of the intravenous fuel. At the same time there is a co-ordination of the operation of the unity of control with other systems of the car.

The information of other sensors and the operational tension that reaches executive bodies secures the best functioning of the motor in any situation. If some sensors fail, the switches of unity of control in the way of the program of emergence to exclude the possible damage of the motor and to supply the new movement of the car.

Short description of the beginnings of functioning of some sensors and mechanisms of actuation of a system of control of the motor

The sensor of the provision of a valve of butterfly (TPS) is built in in the executive mechanism of a valve of butterfly and gives out the information on the current coal of the provision of a valve of butterfly in the module of the management (ECM). The second potenciômetro informs to data ECM on basic value and you form the sign of duplication in the moment of the failure of a potenciômetro of a valve of butterfly.

The sensor of the provision of an end of inclination (CKP) is installed in the cylinder block in a pendulum. It transfers for the information on unity of control on the speed of an end of inclination and the find of the piston of the first cylinder to VMT.

The sensor of the position of the axle (CMP) is located in a face of end of a covering of a head of cylinders. Together with the sensor of the provision of an end of inclination it transfers for the information on unity of control on VMT of the piston of the first cylinder. It serves for the sincronização of the moment of the ignition and the sequence of the ignition.

The sensor of the temperature of cooling the liquid (ECT) is located in a tube of branch of reception of the system of cooling (there see illustrations the Component ones of the installation of the thermostat and the Position of the ECT n ° 2 and n ° 1 D/V). It represents the resistor with the negative coefficient of temperature that the resistance reduces with the growth of the temperature.

The sensor of the measurement of the mass of air (MAF) represents the termoanemometrichesky to measure of instrument that is built in to the air road of entry of the motor. In case of the instrument of measuring the movie of fine, electrically heated touch cooled by the current passer-by of the soaked air it is located. The electric current that heats a movie is regulated by a system of control so that a constant movie maintains the temperature. If, for example, the amount of the soaked air increases, the temperature of the heated movie begins to lessen. At the same time the size of the electric current at the same time increases to guard the temperature of an invariability of plate. The fluctuations of the electric current indicate to the unity of control of the motor his load that there allows to define the amount of the intravenous fuel correctly. The information given out by the sensor is in use for ECM when there is determining parameters of one dosage of the mixture of air fuel.

The sensor of an explosion (KS) is rolled straightly in the cylinder block and services of the prevention of the emergence of the dangerous combustion of shock of the mixture of fuel, allowing to maintain the installation of the moment of the ignition in the explosion edge when the efficiency of the return of the motor supports itself in the very level in the moment of the consumption of least fuel.

The system of the ventilation of a tank of fuel / the capture of evaporation of fuel (EVAP) is composed of a coal adsorber and the valve eletromagnética of the management of a purge of the last one. In an adsorber the steams of fuel that are formed as a consequence of his heating are accumulated. During the operation of the motor the evaporation of fuel that were accumulated in an adsorber stretches out to the entry road and goes to combustion cameras.

The probes of lambda measure the content of oxygen in the carried out gases (FG) before and after catalytic converters and transmit the corresponding signs to the unity of control of the motor.