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| First remove the active carbon filter breather hose -1- from its connection to the active carbon filter solenoid 1 -N80--2-. |
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| Connect to hose -1- the manual vacuum pump -VAS 6213- as shown in the figure. |
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| Operate the manual vacuum pump -VAS 6213- a few times. Vacuum must not build up. |
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| Check breather connection -3- located on bottom of active carbon filter -4- for soiling; clean if necessary. |
| If a vacuum does not build up: |
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| Temporarily seal breather connection -3- and operate vacuum pump again several times. A vacuum must build up. |
| If a vacuum does not build up: |
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| Renew active carbon filter. |
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