On-Board Diagnosis System II - Volkswagen Technical Site
On-Board Diagnosis System II - Volkswagen Technical Site
On-Board Diagnosis System II - Volkswagen Technical Site
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<strong>System</strong> Components (Gasoline Engine)<br />
The tank ventilation system can assume three<br />
different states:<br />
1. The activated charcoal canister is empty.<br />
The fuel-air mixture is leaned down by<br />
activating the fuel tank purging system.<br />
2. The activated charcoal canister is full.<br />
The fuel-air mixture is enriched by activating<br />
the fuel tank purging system.<br />
3. The activated charcoal canister filling is<br />
equivalent to a stoichiometric mixing ratio.<br />
The fuel-air-mixture is neither enriched nor<br />
leaned down. This state is detected by the idle<br />
speed control; states 1+2 are detected by the<br />
lambda control.<br />
Fitting location<br />
The activated charcoal canister of the tank ventilation system is not installed in the wheel housing at the<br />
front right as in other VW models. Instead, it is located behind the wheel housing liner below the rear<br />
right wing.<br />
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