Mazda 3 since 2003
1. Operation and maintenance of the car
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 (ICR)
2.5.2.3. Regulator of idling (IAC)
2.5.2.4. Management of an air duct with variable characteristics (VAD)
2.5.2.5. System of start-up with variable characteristics (VIS)
2.5.2.6. A control system of hashing of air on an admission (VTCS)
2.5.2.7. Control of the mechanism of change of phases of gas distribution
2.5.2.8. Management of fuel injection
2.5.2.9. Management of switching off of the air conditioning system
2.5.2.10. Control of the electric fan
2.5.2.11. Local network of the controller (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. Lubrication system
2.8. Cooling system
2.9. System of an admission
2.10. Fuel system
2.11. System of production of the fulfilled gases and system of decrease in toxicity
2.12. System of ignition
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 duct with variable characteristics (VAD)

The control system of VAD opens the VAD gate in the air filter only at high frequencies of rotation of the engine so that engine capacity did not decrease with a high frequency of rotation because of an insufficient mass consumption of air. The PCM block turns on the electromagnetic valve of management of the VAD system for opening of the gate if the following conditions are met:
– temperature of cooling liquid – is above 70 °C;
– frequency of rotation of the engine – is higher than 5800 min.-1;
– the angle of opening of a butterfly valve – more than 50%.
"previous page
2.5.2.3. Regulator of idling (IAC)		 following page"
2.5.2.5. System of start-up with variable characteristics (VIS)