Mazda 3 since 2003
1. Operation and car maintenance
2. Engine
2.1. General description of new engines of the L8, LF and L3 models
2.2. Mechanical part of engines
2.3. Appendix 1
2.4. Appendix 2
2.5. Appendix 3
2.5.1. Control system
2.5.2. Principle of work and purpose of some components of a control system
2.5.2.1. Sensor of provision of a cam-shaft (SMR)
2.5.2.2. Sensor of provision of a cam-shaft (SKR)
2.5.2.3. Regulator of idling (IAC)
2.5.2.4. Management of an air line with variable characteristics (VAD)
2.5.2.5. Start-up system with variable characteristics (VIS)
2.5.2.6. A control system of hashing of air on an admission (VTCS)
2.5.2.7. Management of the mechanism of change of phases of a gazoraspredeleniye
2.5.2.8. Management of fuel injection
2.5.2.9. Management of switching off of central air of air
2.5.2.10. Management of the electric fan
2.5.2.11. Local network of the controler (CAN)
2.5.2.12. System of onboard diagnostics
2.5.3. Codes of malfunctions
2.6. The Z6 engine – a mechanical part
2.7. Greasing system
2.8. Cooling system
2.9. Admission system
2.10. Fuel system
2.11. System of production of the fulfilled gases and system of decrease in toxicity
2.12. Ignition system
2.13. Control system
2.14. Tables
3. Transmission
4. Running gear
5. Steering mechanism
6. Brake system
7. Onboard electric equipment
8. Body
 








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2-5-2-4-upravlenie-vozdukhovodom-s-peremennymi-kharakteristikami-vad.html

2.5.2.4. Management of an air line with variable characteristics (VAD)

The control system of VAD opens VAD zaslonka in the air filter only on high frequencies of rotation of the engine so that engine capacity did not decrease at high frequency of rotation because of an insufficient mass consumption of air. The PCM block turns on the electromagnetic valve of management of VAD system for zaslonka opening if the following conditions are met:
– the temperature of cooling liquid – is higher than 70 °C;
– frequency of rotation of the engine – is higher than 5800 mines-1;
– a corner of opening of a butterfly valve – more than 50 %.

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2.5.2.3. Regulator of idling (IAC)
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2.5.2.5. Start-up system with variable characteristics (VIS)