1999-2003 of release
Repair and car operation
Subaru Legasi, Autbek
+ Cars Subaru Legacy, Outback
+ The operation manual
+ Routine maintenance
+ The engine
+ Systems of cooling, heating
- The power supply system and release
- System of injection of fuel
Sbrasyvanie pressure in the power supply system
Опорожнение a fuel tank
Check of a condition and replacement of fuel lines and them штуцерных connections
Service of components of an inlet air path
Removal and installation of the case of a throttle
Service of components of a drive throttle заслонки
Removal, service and installation of the inlet pipeline
Service of the fuel pump
Removal and installation of main relay MFI
Removal and installation of the relay of the fuel pump
Removal and installation of the gauge of a stock of fuel
Removal and installation of the gauge of level of fuel in the additional chamber of a fuel tank
Removal, check and installation of the fuel filter
Removal and installation запорного the valve отсечки fuel
Removal and installation демпфирующих fuel valves
Removal and installation of a fuel tank
Removal and installation of a jellied mouth of a fuel tank
Removal and installation of components of system of injection of fuel
+ Control systems of the engine and decrease in toxicity of the fulfilled gases
+ System of release of the fulfilled gases
+ Engine electric equipment
+ Manual box and differential
+ Automatic transmission
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
System of injection of fuel
The general information and safety measuresDesign of an inlet air path of 4-cylinder models (2.0 and 2.5)
Design of an inlet air path of 6-cylinder models (3.0)
Design of assemblage of gauges MAP and IAT (4-cylinder engines)
Design of the gauge of atmospheric pressure (only models 2.0 and 2.5 l with OBD II)
Executive lever TPS is mechanically connected to an axis throttle заслонки
Design of valve IAC used on 4-cylinder engines
Design of the electromagnetic valve of pumping of air to air injectors (only models 2.0 and 2.5 l with OBD II)
Principle of management of pressure pulsations in the inlet pipeline
Function chart of system of giving of fuel of the 4-cylinder engine
Function chart of system of giving of fuel of the 6-cylinder engine
Design of a regulator of pressure of fuel
Design of the fuel injector used on models 2.0 and 2.5 l, equipped with system of onboard self-diagnostics OBD II
Design of the fuel injector used on models 2.0 and 2.5 l, equipped with firm system of onboard self-diagnostics Subaru
Design of the fuel injector used on models 3.0 of l
Design of a fuel tank
Fastening of a fuel tank is carried out by means of two metal assembly tapes lined by pillows
Design of assemblage of the fuel pump
Design and principle of functioning of the pump of pumping
Design of the gauge of level of fuel in the additional chamber of a petrol tank
Design докаталитического a ljambda-probe applied on 4-cylinder models (with OBD II)
Design докаталитического a ljambda-probe applied on 6-cylinder models
Design посткаталитического a ljambda-probe of 4-cylinder models
Design посткаталитического a ljambda-probe of 6-cylinder models
Design and principle of functioning of gauge ECT
Design of gauge CKP of the 4-cylinder engine
Principle of functioning of gauge CKP of 4-cylinder engines
Principle of functioning of gauge CKP of 6-cylinder engines
Principle of functioning of gauge CMP of 4-cylinder engines
Principle of functioning of gauge CMP of 6-cylinder engines
Design of gauge KS of 4-cylinder engines
Design of gauge KS of 4-cylinder engines
Principle of functioning of gauge VSS on models with РКПП
Principle of functioning of gauge VSS on models with АТ
The general information
All models considered in the present Management are equipped by electronic system distributed (MFI) fuel injection. At the expense of use in a control system of the newest technological decisions MFI provides optimisation of configuration of an air-fuel mix in any service conditions of the engine.
Fuel is in the power supply system under constant pressure and through injectors is injected into inlet ports of each of engine cylinders. The dosage of giving of fuel is carried out by management of time of opening of electromagnetic valves of injectors according to the quantity of air forced in the engine defined by concrete operating conditions. Duration of opening of injectors is defined by parametres formed by the management module (ECM) electric impulses that allows to carry out rather exact dosage of an air-fuel mix.
ECM defines necessary length of operating impulses on the basis of the analysis of data continuously arriving from information gauges about speed of movement of the car, position throttle заслонки, temperature of a cooling liquid and so forth
Besides the listed functions system MFI carries out also the control of toxicity of the fulfilled gases, optimisation of a parity of the expense of fuel and engine return, the control of functioning of pedals of gas and a brake, and also provides adequate starting parametres and engine warming up in cold weather, proceeding from the data about temperatures of a cooling liquid and soaked up air.
System of giving of air
The general data
Air banished through an air cleaner arrives in the throttle case, whence, in defined by position throttle заслонки quantity on the inlet pipeline moves to inlet ports of cylinders of the engine where mixes up with fuel injected through injectors, forming a gas mixture. Stability of turns of idling is provided for the account пропускания parts of air weight bypassing the throttle case directly in the inlet pipeline. The control of quantity of additional air is carried out ECM by means of management of functioning special перепускного the valve.
Inlet air path
The inlet air path of the 4-cylinder engine consists from воздухозаборного sleeves, резонаторной chambers and air cleaner assemblages. The resonator is located above an air cleaner on a stream and effectively promotes decrease in level of the noise background arising at всасывании of air in the engine.
On 6-cylinder models in structure of an inlet air path it is included two resonators, established one above an air cleaner on a stream, another more low.
Pressure gauges in the inlet pipeline (MAP) and temperatures of soaked up air (IAT)
On models 2.0 and 2.5 l equipped with 4-cylinder engines, gauges MAP and IAT are united in the uniform assemblage established on assemblage of the inlet pipeline. Gauge MAP serves for measurement of absolute value of pressure in the pipeline, gauge IAT – for measurement of temperature of air soaked up in the engine. Parametres traced by gauges will be transformed to electric signals and transferred on ECM, exercised administration of configuration of an air-fuel mix, and also the injection and ignition moments.
On models 3.0 of l with the 6-cylinder engine gauge MAP is established from above on the throttle case. And continuously gives out on ECM the alarm pressure which size is proportional to size of absolute value of pressure in the inlet pipeline. On the basis of the analysis of the information arriving from gauge MAP (in a compartment with the data delivered by other gauges) ECM defines the moments of injection of fuel and ignition of an air-fuel mix. Gauge IAT is fixed on the case of an air cleaner and traces temperature of an air stream passing on an air line. In a basis of a design of the gauge it is put термистор, which resistance in inverse proportion to temperature of a sensitive element. ECM uses the information arriving from the gauge at updating of structure of an air-fuel mix.
The gauge of atmospheric pressure, - only models 2.0 and 2.5 l with OBD II
The gauge is used only on 4-cylinder models 2.0 and 2.5 l equipped with system of onboard self-diagnostics OBD II, and supplies ECM with the information on pressure of atmospheric air. The gauge design is presented on an illustration.
The throttle case
Placed in the throttle case заслонка copes from a gas pedal according to which position to a greater or lesser extent blocks a throttle aperture through passage that allows to regulate the expense of combustion of the engine of air arriving in chambers. On single turns when the gas pedal is completely released, заслонка almost completely blocks the throttle and air great bulk (more than half) arrives in the inlet pipeline through the special electromagnetic valve of stabilisation of turns of idling (IAC) bypassing the throttle case. Valve IAC use allows to carry out the control of stability of turns of idling without dependence from changes of current loading on the engine (for example, at inclusion of the conditioner of air or other power-intensive consumers).
The gauge of position throttle заслонки (TPS)
TPS it is established on the case of a throttle and it is mechanically connected to an axis throttle заслонки.
The gauge develops and sends ECM the alarm pressure which size is directly proportional to opening degree заслонки. To the closed and opened positions заслонки there correspond accurately certain values of pressure.
The electromagnetic valve of stabilisation of turns of idling (IAC)
Valve IAC is built in the case of a throttle and exercises administration in size of the expense of air which is restarted up bypassing last at work of the engine on single turns. The valve works on signals ECM, allowing the last to support turns of idling of the engine at the set level.
On 4-cylinder engines (2.0 and 2.5) valve IAC represents the step-by-step motor consisting of two coupled windings placed in the general casing, a rod, a constant magnet and a spring. The valve casing is built in assemblage of the case of a throttle. The rod is placed between pair windings and from the party turned towards a magnet is equipped by a carving. Change of polarity of impulses of an operating current passed through windings involves change of polarity of a constant magnet that forces to rotate навернутую on a rod and the nut connected to a magnet. Nut rotation leads to moving подпружиненного a rod making mechanical opening or closing of the valve.
On 6-cylinder engines (3.0) valve IAC of the rotary type consisting from placed in casing of the coil, a rotary element, and a spring is used. The valve casing also is integrated into assemblage of the case of a throttle.
The electromagnetic valve of pumping of air to injectors, - only models 2.0 and 2.5 l with OBD II
The valve is included in a line connecting the case of a throttle with an injector and fixed on the inlet pipeline. Opening and valve closing occurs at the command of ECM, exercising administration of pumping. The valve design is presented on an illustration.
Control mean pressure pulsations in the inlet pipeline, - only l models 3.0
The device allows to support size of a twisting moment developed by the engine on a maximum level without dependence from engine turns. In a partition between the right and left sections of the inlet pipeline it is built in rotary induction заслонка, set in motion established on assemblage of the pipeline by an actuation mechanism. In the course of functioning of the engine in the inlet pipeline the pulsations of pressure raising efficiency of functioning of an inlet air path are generated. The maximum return of such mechanism is reached at distribution of jumps of consolidations to a correct direction, - that becomes possible at the expense of a choice of position established in a partition заслонки according to engine / turns
System of giving of fuel
The general data
Placed in a petrol tank погружной the fuel pump provides fuel giving under pressure to each of injectors. Gasoline moves from the pump to injectors on a fuel path with the filter of thin clearing included in it. The special regulator supports pressure of fuel in a highway on the set optimum level. Through injectors fuel in necessary quantity is injected directly into chambers of combustion of each of engine cylinders where mixes up with air and forms a gas mixture. The quantity of fuel and the injection moment are calculated by the management module. Surplus of fuel on a returnable line arrives back in a fuel tank. The function chart of system of giving of fuel is presented on illustrations.
Regulator of pressure of fuel
The pressure regulator is established from the end of a line of giving of fuel brought to injectors and consists of two chambers divided by a diaphragm: fuel and spring. The fuel chamber is connected to a line of giving of fuel, spring – with the inlet pipeline. Besides, the fuel chamber is equipped редукционным by the valve connected to a line of return of fuel. At increase in depth of depression in the inlet pipeline diaphragm procrastination leads to opening редукционного the valve, - as a result pressure in a fuel highway decreases. Decrease in depth of depression in the pipeline leads отжиманию diaphragms a spring and to increase in submitting pressure. The described mechanism allows to support a difference between pressure of injection and depression in the inlet pipeline at the constant level making 294.0 кПа (3.00 kgs/sm 2) for the models equipped РКПП and 299.1 кПа (3.05 kgs/sm 2) for models with АТ.
In system MFI injectors with the top giving of fuel and air pumping are used. The scheme of connection of injectors provides cooling by their stream of fuel. Injectors of such design differ in the compact sizes, the high thermal stability, the lowered noise background and simplicity in service.
Duration of opening of the electromagnetic needle valve of an injector is defined in the length developed ECM an operating impulse. Whereas the section of a nozzle of an injector, size of opening of the valve and pressure of giving of fuel are supported by constants, the quantity of combustion of fuel injected into the chamber is defined exclusively by duration of time of the opening corresponding to length of operating impulse ECM.
On l models 3.0, and also 2.0 and 2.5 l equipped with system of onboard diagnostics OBD II efficiency of dispersion of injected fuel raise at the expense of pumping of air submitted to injectors from valve IAC on specially organised in body of inlet pipeline to the channel. Мелкодисперсность dispersions not only are raised by efficiency of combustion of a gas mixture, but also allows to lower level of the maintenance of toxic components in combustion products.
On all models it is used fuel the two-chamber design, providing free space under installation of back differential. For перекачивания fuel from the additional chamber in the basic the special pump of the pumping is used, each chamber is equipped by the individual gauge of level of fuel.
The tank fastens under the bottom in a back part of the car by means of two assembly tapes.
The fuel pump
The fuel pump consists from drive the electromotor, a rotor, a casing, a cover, the control valve and the filter and is united in uniform assemblage with the gauge of a stock of fuel and the pumping pump. Pump use роторного type allows in essential measure to lower level made by it at work of a noise background.
At ignition inclusion there is an activation of the relay of the fuel pump then the electromotor starts to rotate, actuating a pump rotor.
At rotation of a rotor fuel, fuel under the influence of centrifugal force starts to flow on special channels from one образуемой cavity shovels in another, the friction arising thus leads to creation of the pressure difference defining a pressure developed by the pump.
Fuel pushed by a rotating rotor gets to a backlash between an anchor and an electromotor magnet, then is pushed out through the control valve.
When pressure of a discharge (dump) reaches some preset value, the special safety valve preventing excessive growth of pressure opens.
At a stop of the engine and the fuel pump the effort developed by a spring leads перекрыванию the control valve of digit port that allows to keep pressure in a power supply system path.
Pump assemblage it is built in two filtering elements. In inlet port of the pump the mesh filter protecting the pump from hit in it concerning large extraneous inclusions is established. The target port of the pump is equipped steady against influence of a high pressure by the filter of the cartridge type preventing hit in the power supply system of the smallest particles.
The pumping pump
United in uniform assemblage with the fuel pump/gauge of a stock of fuel the pumping pump uses energy of rotation of a superfluous stream of fuel returned from the engine for creation of the depression providing перекачивание of fuel from the additional chamber of a petrol tank basically.
At infringement of passableness of a nozzle of a returnable line fuel comes back in a tank through a safety valve.
The gauge of level of fuel in an additional compartment of a fuel tank
In the additional chamber of a petrol tank the separate gauge of the control of level of fuel is established. The gauge is rolled in a line of pumping of fuel in the basic camera and serves for alignment of levels of fuel in both chambers of a tank at functioning of the pump of pumping.
Dokatalitichesky ljambda-probe (only models with OBD II)
The sensitive element докаталитического a ljambda-probe is generated from firm electrolit on a basis оксида zirconium (ZrO2), possessing ability to develop ЭДС at bilaterial contact to the zones sated with ions of oxygen of various concentration, and the size given ЭДС depends on a difference in concentration of ions. The given property оксида zirconium is used in докаталитическом a ljambda-probe for definition of concentration of oxygen in the fulfilled gases of the engine.
From small amount ZrO 2 the tube closed from one end shipped by the external surface in a final path of the engine ahead каталитического of the converter while the internal surface contacts to atmospheric air is generated. The platinum covering having porous structure is put on an external surface of a tube. The probe case is earthed on weight of an exhaust pipe, the internal electrode by means of electroconducting is deduced on ECM, continuously tracing current developed by the gauge and on the basis of the analysis of the arriving information carrying out updating of structure of an air-fuel mix.
In addition the ceramic heating element providing serviceability of functioning of a probe before warming up of the engine is built in the gauge.
At combustion in cylinders of the engine of the enriched air-fuel mix all containing in products of combustion oxygen is absorbed in a course каталитической the reaction occurring in a layer of platinum, covering an external surface циркониевой tubes. As a result the difference of concentration of ions of oxygen from external and internal surfaces of a tube appears very big that in appropriate way affects size developed by sensitive element ЭДС.
In products of combustion of the impoverished mix contains considerably большее quantity of oxygen, and the platinum catalyst appears not capable completely it to absorb. Increase of concentration of ions of oxygen from the inside циркониевой tubes leads to decrease developed by gauge EDS.
Insignificant deviations of structure of an air-fuel mix from стехиометрического numbers very strong impact on the oxygen maintenance in combustion products makes, causing appreciable deviations in size ЭДС. On the basis of the analysis of information ECM arriving from a ljambda-probe easily defines current structure of a gas mixture and in case of need develops a command on its corresponding updating.
The Postkatalitichesky ljambda-probe serves for definition of concentration of oxygen in the fulfilled gases of the engine and is established more low каталитического the converter on a stream. The deviation of structure of an air-fuel mix from стехиометрического numbers towards pauperisation leads to increase of concentration of oxygen in the fulfilled gases, and on the contrary. The Ljambda-probe allows ECM to trace in time such deviations and in due time to make necessary updating.
The design посткаталитического a ljambda-probe rather slightly differs from described above a design докаталитического the gauge.
The functioning principle посткаталитического a ljambda-probe is explained on an illustration. It is necessary to notice that the working temperature посткаталитического a ljambda-probe considerably below working temperature докаталитического the gauge and lies within a range from 300 to 400 °С.На the models equipped with two ljambda-probes (доcatalytic and постcatalytic), distinctions in indications of gauges allow to estimate efficiency of functioning каталитического the converter.
The gauge of temperature of a cooling liquid of the engine (ECT)
The gauge of temperature of a cooling liquid is established on a branch pipe охладительного a path and is термистор which resistance changes in inverse proportion to temperature. The information given out by the gauge is used ECM at management in parametres of ignition and fuel injection, and also at definition of the moments of a purge of a coal adsorber.
The gauge of position of a cranked shaft (CKP)
On 4-cylinder engines the gauge of position of a cranked shaft (CKP) is established on assemblage of the oil pump in the central part of a forward half of block of cylinders. On 6-cylinder engines CKP is located in a back part of the block. The gauge has not folding design and consists of a magnet, the core and the contact plug.
At passage before sensitive element CKP of a teeth rotating together with shaft роторной plates as a result of reduction of an air backlash there is a change of a magnetic stream in the gauge winding, accompanied by generation of an impulse of alarm pressure.
On the basis of the analysis of information ECM arriving from the gauge defines angular position of a cranked shaft.
The gauge of position of a camshaft (CMP)
On 4-cylinder engines gauge CMP is located on a support of a camshaft of the left head of cylinders, on 6-cylinder engines – on the right head.
The principle of functioning CMP is similar described above for the gauge of position of a cranked shaft. Instead of a gear rotor in a special way placed ledges from the back party of a cogwheel of the left camshaft (4-cylinder engines), or grooves in a forming surface of the special plate established on a pin of the right inlet camshaft (6-cylinder engines) here are used.
On the basis of the analysis of information ECM arriving from the gauge by current angular position of a camshaft traces the moments of phases timing in cylinders.
The detonation gauge (KS)
Gauge KS is established on the block of cylinders and serves for tracing of the moments of occurrence of a detonation in the engine.
The gauge design is presented on illustrations. When level of vibrations of the engine as a result of a detonation increases, placed in the gauge case грузик influences a piezoelement which immediately starts to generate alarm pressure, notifying ECM on necessity of corresponding updating of a corner of an advancing of ignition.
The gauge of speed of movement (VSS)
Gauge VSS is established on картере transmissions.
On models with РКПП the gauge generates and gives out on ECM and a combination of devices of 4 alarm impulses on each turn of forward differential.
On models with АТ for one turn of forward differential the gauge develops a 16-pulse signal transferred to the module of management by transmission (TCM) where it will be transformed to a standard 4-pulse signal and stands out further on ECM and a combination of devices.
Management of giving of fuel and configuration of an air-fuel mix
The Section of the Control system of the engine and decrease in toxicity of the fulfilled see.
Security measures and rules of observance of cleanliness at work with fuel system
The general rules
Do not come nearer to a place of work with open fire or the lighted cigarette. Always keep in readiness the fire extinguisher!
Fuel steams are poisonous, - watch maintenance of normal ventilation of a workplace!
The fuel system is under pressure. At opening of system fuel can be pulled out from it with a high pressure, - before отпусканием штуцерных sockets turn their rags. Use goggles!
Collars of tape and tightening type can be applied to fastening шланговых connections. After a detachment of hoses it is necessary to replace tightening collars tape or worm. Fixing of locks of some collars demands application of special adaptations, - consult with experts firm HUNDRED Subaru.
Before undocking штуцерных sockets carefully wipe them outside in order to avoid hit of a dirt in a path.
Removed components stack on a pure lining and turn in polyethylene or a paper, - avoid application for rubbing and оборачивания components ворсящейся rags.
If repair demands time, track, that all open apertures in knots and power supply system components have been carefully muffled.
Establish into place only pure details. Spare parts take out from packing only directly ahead of installation. Do not apply details which were stored unpacked (for example, in a tool box).
Avoid application of compressed air at an open fuel path. Whenever possible try not to move the car.
Do not apply some hermetics containing silicone. The particles which have got to the engine of silicone do not burn down and ljambda-probe damage can be at the bottom.
Security measures at removal of a fuel tank
Before removal empty a fuel tank (Razdel Oporozhnenie of a fuel tank see).
The tank acts in film from the bottom party of the car. Before отпусканием assembly tapes, prop up a tank from below тележечным a jack, - between a tank and a jack head lay wooden брусок.
The empty tank is explosive and before recycling should be cut on a part, - try not to admit at tank cutting искрообразования! Will hand over most correctly a tank in special place of acceptance.
After tank installation start the engine and check up tightness of all connections.
Recommendations about economy of the expense of fuel
The information on the fuel expense is deduced on the panel of devices of the car.
Essential influence on the fuel expense renders style of driving. Some councils about reasonable use of a pedal of an accelerator on equipped with system of injection of fuel cars are more low resulted:
a) In any weather (even in a frost) begin movement right after realisation of start of the engine;
b) At a car stop for a while more on 40 with, suppress the engine;
c) Try to move always on as much as possible high transfer;
d) On distant trips try to support constant speed of movement. Avoid movement on excessively high speeds. Operate the car circumspectly, avoid causeless braking;
e) transport the car excessive cargo, in the absence of need remove from a roof the top luggage carrier;
f) Regularly check pressure of a rating of tyres, - try not to suppose its excessive decrease.
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