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
- Control systems of the engine and decrease in toxicity of the fulfilled gases
ЕСМ - check of serviceability of a condition and replacement
Diagnostics of malfunctions - the general information and preliminary checks
System of onboard self-diagnostics (OBD) - the general information
Application of an oscillograph for supervision of working parametres of a control system
Removal and installation of components of systems of 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
Control systems of the engine and decrease in toxicity of the fulfilled gases
The general informationFunction chart of control systems of the engine/decrease of toxicity of the fulfilled gases (models 2.0 and 2.5 l equipped with system of diagnostics OBD II)
Function chart of control systems of the engine/decrease of toxicity of the fulfilled gases (models 2.0 and 2.5 l equipped OBD Subaru)
Function chart of control systems of the engine/decrease of toxicity of the fulfilled gases (model 3.0)
Monitoring of structure of an air-fuel mix
For the purpose of decrease in level of issue in atmosphere of the toxic components getting to structure of fulfilled gases of the engine as a result of evaporation and incompleteness of combustion of fuel, and also for maintenance of efficiency of return of the engine and decrease in the expense of the fuel, cars considered in the present Management are equipped by variety of special systems which can be united under the general name of control systems of the engine and decrease in toxicity of the fulfilled gases. The complete set of systems depends on year of release of models and region, on whose market the car is delivered. The full information on type and structure of systems is resulted on information label VECI fixed under a cowl.
To number of the systems concerning management by work of the engine and the control over toxicity of fulfilled gases, it is necessary to carry the following (depending on a complete set):
a) ignition System (the engine Electric equipment see the Head);
b) System of catching of fuel evaporations (EVAP);
c) System recycling the fulfilled gases (EGR) (models 3.0;
d) System of operated ventilation картера (PCV);
e) the Katalitichesky converter (;
f) the Conductor of a jellied mouth of a fuel tank (under a refuelling pistol of columns of pouring unleaded gasoline);
g) System of onboard diagnostics (OBD).
Functioning of all listed systems, anyhow, directly or indirectly, is connected with management of decrease in toxicity of the fulfilled gases. In the Sections resulted more low the general descriptions of principles of functioning of each of systems are given, and also procedures of diagnostic checks and regenerative repair (if that is obviously possible) the separate components which performance lies within qualification of the average mechanic-fan are stated
Before to come to conclusion about refusal any of systems of decrease in toxicity, attentively check up serviceability of functioning of power supply systems and ignition. Diagnostics of systems of decrease in toxicity some of knots demands use of the special difficult equipment in application and certain qualification of the executor that is why, it will be reasonable to charge its performance to professional mechanics of a specialised car repair shop. Told above does not mean that service and repair of components of systems of decrease in toxicity in practice are represented exigeant. It is necessary to remember that one of the most widespread causes of failures is elementary infringement of quality of connections of vacuum or electric lines that is why, first of all always it is necessary to check a condition corresponding electric and штуцерных sockets. The owner of the car can make independently and easily enough variety of checks, and also, execute in house conditions set of procedures of routine maintenance of the majority of components of systems, using thus a usual set of the adjusting and metalwork tool.
Try to observe all safety measures stipulated in below-mentioned Sections at performance of service of electronic components of considered systems. It is necessary to notice that the illustrative material can correspond not always in accuracy to real placing of components on the car. Such discrepancies are connected with continuously occurring process of updating within the limits of a typical design of each model.
Control system of the engine
The management module (ECM)
The general information
ECM represents the electronic module on the basis of the microprocessor which on the basis of the analysis of signals arriving from various information gauges exercises administration of functioning of systems of injection, ignitions and decrease in toxicity of the fulfilled gases.
Into number carried out ECM problems enter:
a) fuel Management in parametres of injection;
b) ignition Management in parametres;
c) Management of functioning of system of stabilisation of turns of idling (IAC);
d) Management of system EVAP functioning;
e) Management of functioning of the fan of system of cooling;
f) Management of functioning of the fuel pump;
g) Management of system EGR functioning (models 3.0;
i) Activation of emergency parametres of the failed subsystems.
When ECM develops target signals of the fixed level without the signals arriving from a ljambda-probe (ов), say that the control system functions in a mode of "an open contour», i.e., without a feedback. If the module starts to process given out by the oxygen gauge (ами) the information the mode becomes "closed" that allows ECM to correct parametres of injection and ignition taking into account current operational characteristics of the engine (turns, loading, temperature, and so forth).
In memory of the module emergency values (values by default) the basic working parametres of all subsystems of management are put. The given parametres are activated in case of revealing of refusal of a corresponding subsystem, providing adequacy of functioning of the engine (with inevitable loss of efficiency of return).
Refusal of any subject to monitoring from outside the block of self-diagnostics of a component is fixed in memory of the module in the form of a corresponding five-place code (DTC), which reading can be made by means of the special scanner (the Section System of onboard self-diagnostics (OBD) - the general information) see.
Giving of fuel and configuration of an air-fuel mix
Tracing and analyzing the data arriving from corresponding information gauges, ECM defines necessary parametres of giving of fuel (quantity and the injection moments). The module carries out the continuous consecutive control of injection at any service conditions of the engine, except the warming up moments at start.
The quantity of fuel injected into the engine is defined by duration of opening of needle valves of injectors.
The injection moment is calculated taking into account peak efficiency of giving of air in each of engine cylinders (fuel is injected directly ahead of the moment of the beginning of opening of the inlet valve).
Duration of injection
During engine warming up at start duration of opening of injectors is defined by gauge ECM according to change of temperature of a cooling liquid. After the engine will get warm to normal working temperature, the following scheme of definition of duration of injection joins: «Base value х Adjustment parametres + the Variable of indemnification of change of level of pressure». Thus base value of duration of opening of an injector is defined by two major factors: quantity of air submitted to the engine (on signals of the gauge of pressure in the pipeline) and current frequency of rotation of the engine (on gauge CKP signals). Adjustment parametres are considered more low. The compensatory variable urged to compensate time delays of operation of the injectors, the pressure of the storage battery connected with variations.
The organisation listed below updatings allows to correct in due time base value of duration of opening of injectors for the purpose of maintenance of optimum quality of an air-fuel mix at any parametres of functioning of the engine.
· Updating of structure of an air-fuel mix on signals докаталитического a ljambda-probe. On equipped catalytic the converter models given out доcatalytic a ljambda-probe the information on maintenance level in the fulfilled gases of oxygen allows ECM to correct in due time a dosage of giving of fuel for the purpose of prevention of appreciable deviations of quality of a gas mixture from стехиометрического values;
· Starting updating of structure of a mix. During the moment проворачивания a cranked shaft at start duration of opening of injectors compulsorily increases for the purpose of maintenance of stability of turns of the engine;
· Updating of structure of a mix during engine warming up. The given updating (the more low the temperature of a cooling liquid, the duration of injection there is more) is carried out on the basis of the data which is given out by gauge ECT, and used ECM for stabilisation of turns of the engine during its warming up;
· Poststarting updating. The given updating allows to stabilise engine turns during the moment directly after realisation of its start (the information on temperature of the cooling liquid, delivered by gauge ECT is considered also);
· Updating of structure of a mix at full opening throttle заслонки. At full opening throttle заслонки duration of time of opening of injectors increases according to the information arriving from TPS and the gauge of pressure in the inlet pipeline;
· Updating of structure of a mix during an acceleration. The given updating urged to compensate a time delay of definition of quantity of soaked up air for the purpose of increase of sensitivity of the engine on manipulation with a pedal of gas during an acceleration.
On considered models updating of structure of an air-fuel mix on signals докаталитического a ljambda-probe is organised intellectually. The essence of the told is concluded in the following: during management of structure of mix ECM on the basis of the analysis of the information arriving from the oxygen gauge calculates correcting variable which then is added to put in memory of the processor (corresponding to current turns of the engine) to base value of duration of time of opening of injectors, thus sensitivity and reactance of system by that more low, than more considerably size of the demanded time additive. The intellectual organisation of process allows to bypass the given situation at the expense of continuous updating of base value by addition to it of last correcting additive and preservation of total value in operative memory of the processor, thus, the size of the next updating is essentially reduced, and efficiency of functioning of system increases.
Gas mixture ignition
The scheme of management in parametres of ignition on models 2.0 and 2.5 l
The scheme of management in parametres of ignition on l models 3.0
ECM continuously traces a current working condition of the engine on the signals arriving from gauges of pressure, temperatures of a cooling liquid, temperature of soaked up air of position of a cranked shaft and so forth On the basis of the analysis of received information ECM selects optimum (from put in memory of the processor) the ignition moment in which gives out on the module of ignition a signal of interruption of a primary contour.
At management of ignition intellectual function (function of fast recognition) in which the data written down in memory ECM is compared to the information arriving from information gauges and gauges-switches also is used. So, at a choice of the moment of ignition for any operating conditions of engine ECM processes the information on target capacity of the power unit, the fuel expense, structure of the fulfilled gases and so forth During engine start fluctuations of its turns in view of what the management module is not capable to supervise adequately a corner of an advancing of ignition always take place, therefore for the given period the corner compulsorily is exposed on 10 ° before ВМТ on a special signal «10 °» gauge CKP.
The primary goals of the device is indemnification of increase of loading on the engine at activation К/В or other power-intensive consumer of the electric power, increase of turns of idling of the engine in an initial stage of its warming up, maintenance of buffer effect at fast closing throttle заслонки, and also increase of stability of turns of the engine idling.
Leaning against the information delivered by the gauge of position of a camshaft (CMP), ECM provides management functioning of the fuel pump by inclusion/deenergizing of its relay. For the purpose of increase of level of safety the fuel pump is automatically blocked at spontaneous остановах the engine at the included ignition. The principle of the organisation of management is formulated in the table resulted above.
System PCV serves for issue decrease in atmosphere of hydrocarbonic connections at the expense of a conclusion from the engine картерных gases.
Three-functional каталитический the converter (TWC)
The Katalitichesky converter () is a component of systems of decrease in toxicity of the fulfilled gases, is included in structure of system of release and serves for issue decrease in atmosphere of toxic components. There are two types каталитических converters. The usual oxidising converter allows to lower the maintenance in the fulfilled gases of hydrocarbons (NANOSECOND) and монооксида carbon (WITH). Three-functional каталитический the converter (TWC) in addition allows to reduce issue оксидов nitrogen (NОХ). On all models considered in the present Management are used three-functional каталитические converters.
Peak efficiency of functioning of the catalyst is reached at certain concentration in the fulfilled gases of toxic components. The demanded balance is reached at the expense of the control of structure of an air-fuel mix which the control system tries to support constantly near to the value equal стехиометрическому to number, - the following subsection see.
The system on the basis of the signals continuously arriving докаталитического of a ljambda-probe (ов), makes corresponding updatings of base value of duration of opening of injectors for the purpose of maintenance of quality of an air-fuel mix close стехиометрического values (14.7 parts of air on 1 part of fuel), providing optimum conditions for functioning three-functional каталитического the converter (TWC).
In system the intellectual updating of current base values allowing appreciably to raise reactance of responses to occurring changes also is provided.
The scheme of functioning of a control system of ignition of the 6-cylinder engine
Principle of functioning of system EGR
The scheme of functioning of system of catching of fuel evaporations (EVAP) on models 2.0 and 2.5 l (on models 3.0 of l the scheme is organised similarly)
On the basis of the analysis of arriving information ECM calculates optimum values of a corner of an advancing and porosity of operating impulses of ignition for any current working parametres of the engine. In the work ECM uses a program card of management on the closed contour, providing magnificent reactance of responses to any changes of the entering data.
Safety valve design () covers of a jellied mouth of a fuel tank
Design of the coal adsorber used on models with OBD II
Design of the coal adsorber used on models 2.0 and 2.5 l with OBD Subaru
Design of the electromagnetic valve of a purge of an adsorber on models 2.0 and 2.5 l
Design of the electromagnetic valve of a purge of an adsorber on l models 3.0
Design of the double-thread valve established on models with OBD II
Design of the double-thread valve established on models with OBD Subaru (models 2.0 and 2.5)
The zapornyj valve is built in directly in испарительную a tube of a cover of a fuel tank. Lifting of level of fuel in a tank leads to aperture lock-out in a cover, leaving it a unique exit through испарительную a tube in a coal adsorber.
The scheme of a lining of vacuum lines on models 2.0 and 2.5 l equipped with system of onboard diagnostics OBD II
The scheme of a lining of vacuum lines on models 2.0 and 2.5 l equipped OBD Subaru
The scheme of a lining of vacuum lines on l models 3.0 (OBD II)