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| Detach vacuum hose -1- from secondary air inlet valve -N112--2-. |
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| Connect hand vacuum pump (e.g. -V.A.G 1390- or -VAS 6213-) to vacuum hose -1-. |
Note Do not use any compressed air during the subsequent test! |
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| Detach pressure hose from the secondary air pump and blow into -arrow-. |
| Combination valve must be closed. |
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| Build up vacuum with hand vacuum pump. |
If the combination valve does not open: |
For engines with engine code AQY and AZH 08.2000 ? |
Special tools and workshop equipment required |
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| Vehicle system tester -V.A.G 1552 - with cable -V.A.G 1551/3A, 3B oder 3C- |
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| Vacuum lines and hose connections are without any leaks |
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| Vacuum lines are not blocked |
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| Secondary air pump is o.k. |
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| Secondary air pump relay -J299- is o.k. |
Note The valve is closed in stillstand and is opened by air pressure from the secondary air pump. |
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| Remove intake hose between throttle valve and air filter → Chapter. |
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| Slacken top union nut at connection pipe between combination valve and exhaust manifold, or slacken the connection pipe by slightly pulling off. |
| Air must flow out of the opened connection points behind the combination valve at regular intervals. |
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| The combination valve does not open, replace the combination valve → Chapter. |
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