Removal and installation of a flowmeter of air. Audi A4 (from 2001 to 2005 release)
Service of Audi A4 from 2001 to 2005 release.
1. Operation and maintenance of the car
2. Engine
2.1. General information
2.2. Predvaritlny checks
2.3. Mekhanichsky part (petrol engines 2,0l)
2.4. Lubrication system
2.5. Cooling system
2.6. System of injection
2.6.1. Removal and installation of a turbocharger
2.6.2. Removal and installation of the vacuum block of a turbocharger
2.6.3. Adjustment of the vacuum block of a turbocharger (the turbocharger is removed)
2.6.4. The general instructions on self-diagnostics of system of injection
2.6.5. Decrease in high pressure of fuel
2.6.6. Removal and installation of a flowmeter of air
2.6.7. Removal and installation of an inlet collector with a fuel stage
2.6.8. Removal and installation of a fuel stage (Rail)
2.6.9. Removal and installation of nozzles
2.6.10. Check of pressure of fuel and residual pressure in front of the pump of high pressure
2.6.11. Check of residual pressure
2.6.12. Removal and installation of the pump of high pressure
2.6.13. Replacement of the control unit of the engine
2.6.14. Removal and installation a lambda probe in front of the catalyst
2.6.15. Removal and installation a lambda probe after the catalyst
2.6.16. The fuel tank (front-wheel cars – all models with MPI engines and 2,0 l of FSI)
2.6.17. Pumping of fuel from a tank
2.6.18. Removal and installation of the fuel tank with hinged details
2.6.19. Electric check of the fuel pump
2.6.20. Check of amount of the fuel given by the fuel pump (cars from the 4th the cylinder engine with a free admission)
2.6.21. Check of amount of the fuel given by the fuel pump (atomobil with the engine of 1,8 l Turbo)
2.6.22. Check of amount of the fuel given by the fuel pump (atomobil from the 4th the cylinder FSI engine)
2.6.23. Check of amount of the fuel given by the fuel pump (cars from 6 the cylinder MPI engine)
2.6.24. Removal and installation of knot of supply of fuel
2.6.25. Fuel tank (all-wheel drive cars till 10:04)
2.6.26. Pumping of fuel from a tank
2.6.27. Removal and installation of knot of a pedal of an accelerator with sensors of provision of a pedal
2.7. System of production of the fulfilled gases
2.8. Mechanical part (petrol engines 3,0; 3,2 l)
2.9. Mechanical part (petrol engines of 4,2 l)
2.10. Mechanical part (diesel engines of 2,0 l)
2.11. Tables
3. Transmission
4. Running gear
5. Steering mechanism
6. Brake system
7. Onboard electric equipment
8. Body
9. Schemes of electric equipment
 







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2.6.6. Removal and installation of a flowmeter of air

Fig. 2.229. Scheme of installation sites of components of system of injection: 1 – air flowmeter; 2 – lambda probe and heating lambda probe; 3 – a lambda probe after the catalyst and heating a lambda probe 1 after the catalyst; 4 – sensor of temperature of cooling liquid; 5 – the valve 1 for the mechanism of change of phases of gas distribution; 6 – fuel pressure regulator valve; 7 – one-piston pump of high pressure; 8 – fuel pressure sensor, low pressure; 9 – the engine of the gate of an inlet collector with a potentiometer of the gate of an inlet collector; 10 – engine speed sensor; 11 – 6-contact shtekerny connection; 12 – 6-contact shtekerny connection; 13 – the electromagnetic valve 1 for an absorber with absorbent carbon; 14 – engine control unit; 15 – pressurization pressure sensor; 16 – control unit of a butterfly valve, drive of a butterfly valve (electric management of gas); 17 – the sensor of temperature of the soaked-up air; 18 – fuel pressure sensor; 19 – Hall's sensor (sensor of position of the camshaft); 20 – ignition coils with powerful terminal steps; 21 – perepuskny air valve of a turbocharger; 22 – electromagnetic valve of restriction of pressure of pressurization



Removal

Fig. 2.230. Electric plug of a flowmeter of air


Disconnect the electric plug 1 from a flowmeter of air (fig. 2.230).
Unscrew both screws of an air duct on a radiator frame.

Fig. 2.2. Air duct


Remove an air duct 2 from the case of the air filter (fig. 2.2).
Open a clip of a hose of the air duct going to a turbocharger and to pull together a hose from an air flowmeter.
Turn off both screws of fastening on an air flowmeter.
Carefully extend an air flowmeter from a guide of the case of the air filter.

Installation
For trouble-free operation of a flowmeter of air important observe the following instructions and an operating procedure.

NOTE
At strong pollution or saturation by moisture of the filtering element of the air filter of a part of dirt or moisture can get to a flowmeter of air and distort results of measurements of a consumption of air. It will lead to loss of power as calculation of smaller volume of injection of fuel is carried out.
Use only the original filtering element of the air filter.
For installation of a hose of an air duct use lubricant (without silicone).
For fastening of all connections of hoses use collars of the corresponding series.

Check a flowmeter of air and a hose of an air duct (the party of clean air) for lack of salt deposits, dirt and leaves.
Check the soaking-up channel to the filtering element of the air filter for dirt availability. If dirt is found, clear the case of the air filter (top and lower speak rapidly) from deposits of salt, dirt and leaves (if necessary to wash out or clear the vacuum cleaner).
Further installation is carried out in the return sequence.


2.6.5. Decrease in high pressure of fuel

2.6.7. Removal and installation of an inlet collector with a fuel stage