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| No leaks at hose connections. |
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| Remove combination valve for secondary air system: left-side → Chapter, right-side → Chapter. |
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| Connect hand vacuum pump -VAS 6213- to vacuum connection -1- of combination valve for secondary air. |
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| Connect suitable test hose -2- to combination valve for secondary air. |
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| Blow lightly into test hose -2- with your mouth (do not use compressed air). |
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| The combination valve for secondary air system should be closed; it should not be possible to blow through the hose. |
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| Operate hand vacuum pump. |
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| The combination valve for secondary air system should open; it should now be possible to blow through the hose. |
| If combination valve for secondary air does not open: |
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| Renew combination valve for secondary air system: on left-side → Chapter, on right-side → Chapter. |
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