Subaru Forester

1997-2005 of release

Repair and car operation



Subaru Forester
+ Cars Subaru Forester
+ The maintenance instruction
+ Routine maintenance
+ The engine
+ Systems of cooling, heating
+ The power supply system and release
- Engine electric equipment
   Specifications
   Start of the engine from the auxiliary power supply
   Removal and installation of the storage battery
   Check of a condition and replacement of wires of the battery
   Ignition system - the general information and safety measures
   Check of serviceability of functioning of system of ignition
   Assemblage of coils of ignition - the general information, check of a condition and replacement
   Check and adjustment of installation of a corner of an advancing of ignition
   Replacement of the module of ignition
   Check of serviceability of functioning of gauges CKP, CMP and detonations
   Service of spark plugs
   Check of a condition of high-voltage wires
   Charge system - the general information and safety measures
   The generator, the general information, check and service
   Removal and generator installation
   Start system - the general information and safety measures
   Check of serviceability of functioning of a starter and start chain
   Starters Nippondenso - check and service
   Starters Mitsubishi - check and service
+ Control systems of the engine
+ Gear change box
+ Coupling, трансмиссионная a line
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
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Ignition system - the general information and safety measures

On models considered in the present Management the system of direct ignition (DIS), working under control of ECM (see the Head of the Control system of the engine) is used. The management module defines parametres of a corner of an advancing of ignition, being based on the basis of the information arriving from various information gauges, continuously tracing service conditions and a current condition of the engine and giving out corresponding commands to the ignition module.

Function chart of system of ignition


1  — the  Battery
2  — the  ignition Switch
3  — the  Gauge of position of a camshaft (CMP)
4  — the  ignition Coil
5  — the  Spark plug
6  — the  ignition Module

7  — the  detonation Gauge
8  — the  Forward oxygen gauge
9  — the  Gauge of temperature of a cooling liquid of the engine (ECT)
10  — the  Back oxygen gauge
11  — the  Gauge of measurement of weight of air


For the purpose of ignition of an air-fuel mix in cylinders of the engine the system generates high-voltage (ВВ) pressure and gives out it on screwed in each of cylinders of the engine of a spark plug. Pressure should be high enough to provide "breakdown" of an air backlash between candle electrodes. Besides, "breakdown" should occur during strictly certain moment of time corresponding to current position of the piston in the cylinder and answering to inquiries of the engine in a wide range of operational parametres.

The structure of systems of direct ignition includes gauges of position of distributive and cranked shaft (СМР and СКР), the complete set united in the separate block from two coils of ignition (individual cylinders for each pair) and the ignition module. The onboard processor (ЕСМ) develops the basic signals defining an order of connection of the module of ignition to each of coils according to current position of a cranked shaft. As already it was mentioned above, installation of a corner of an advancing of ignition is carried out by the module of management on the basis of the analysis of the signals arriving from various information gauges, a part systems of ignition of injection of fuel. Gauges here enter eats, VSS, TPS, positions АТ, a measuring instrument of the expense of air/gauge MAF, the detonation gauge (see the Head of the Control system of the engine). The ignition module carries out signal distribution between coils and supervises duration of impulses of their operation (on a primary current).

In system DIS at ignition distribution the single spark is used. At the command of ЕСМ искрообразование occurs in simultaneously two cylinders the piston of one of which is in the end of a step of compression, another - in the end of a final step. Thus the basic power failure is necessary on a candle of the cylinder which is in a step of compression in view of much more of a high pressure in it. Capacity искрообразования in the second the cylinder will be minimum (a single spark), providing thus reburning remaining in the chamber of combustion of molecules of an air-fuel mix that allows to achieve more effective decrease in toxicity of the fulfilled gases. Искрообразование occurs at a time in cylinders 1-2 and 3-4.

At service of systems of direct ignition it is necessary to observe special safety measures:
  1. If the engine is not started, do not hold the ignition key continuously turned in position ON within more than 10 seconds on end;
  2. Watch, that tachometre connection was carried out strictly according to instructions of manufacturers, - some of let out measuring instruments can not approach for use on the given models;
  3. At all do not suppose grounding of contact plugs of coils of ignition on weight, - the slightest imprudence in this question can lead to failure of the module of ignition and-or actually coils;
  4. Do not disconnect the battery at the working engine;
  5. Watch correctness of grounding of the module of ignition.