Contents: Cars with engine letter designations…↓ Cars with engine letter designations…↓ Description of the operating…↓
Cars with engine letter designations AZZ, BKJ, BMV and BRJ
Depending on the pressure and ambient temperature, fuel vapors form to a greater or lesser extent above the surface of the fuel in the tank.
The activated carbon absorber system prevents these hydrocarbon vapors from entering the atmosphere.
Fuel vapors come from the highest point of the fuel tank (at the filler neck) through the expansion tank into the absorber with activated carbon.
Activated carbon absorbs these gases like a sponge.
While driving with active lambda control (the engine is warmed up) the electromagnetic valve 1 of the N80 activated carbon canister is controlled by the engine control unit depending on the load and speed. The opening time depends on the incoming signals.
During the cleaning process (activated carbon regeneration) due to the vacuum in the intake manifold, clean air is sucked in through the ventilation pipe of the absorber. The fuel vapors and clean air contained in the activated carbon at a certain point in time are dosed and then burned in the engine.
In the absence of power supply (eg a break in an electrical circuit) solenoid valve 1 of the activated carbon absorber N80 is closed. In this case, the absorber is not emptied.
NOTE: Hose connections are secured with spring and clamp clamps.
Clamp clamps should always be replaced with spring clamps.
Cars with engine letter designations BAA and BMX
Depending on the pressure and ambient temperature, fuel vapors form to a greater or lesser extent above the surface of the fuel in the tank.
The activated carbon absorber system prevents these hydrocarbon vapors from entering the atmosphere.
Fuel vapors come from the highest point of the fuel tank (at the filler neck) through the expansion tank into the absorber with activated carbon.
Activated carbon absorbs these gases like a sponge.
While driving with active lambda control (warm engine) the solenoid valve 1 of the activated carbon canister N80 and the solenoid valve 2 of the activated carbon canister N115 are controlled depending on the load and speed by the engine control unit. The opening time depends on the incoming signals.
(The original information is posted on the website: vwmanual.ru)
During the cleaning process (activated carbon regeneration) due to the vacuum in the intake manifold, clean air is sucked in through the ventilation pipe of the absorber. The fuel vapors and clean air contained in the activated carbon at a certain point in time are dosed and then burned in the engine.
In the absence of power supply (eg a break in an electrical circuit) the absorber system electromagnetic valves are closed. In this case, the absorber does not empty.
Description of the operating principle of the leak diagnostic system
Absorber system (including fuel tank) equipped with a leak diagnostic system that detects leaks in the system.
The diagnosis is based on the principle of excess pressure and should indicate leaks with a diameter greater than 1 mm.
During diagnosis via the fuel system diagnostic pump V144, an excess pressure of about 30 mbar is created in the absorber system. When the specified pressure is reached, the pump is switched off. If the pressure drops below a certain value, the pump is switched on again. The self-diagnosis system monitors the frequency of switching on of the pump and stores an error in the fault memory if the intervals are too short.
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