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Secondary Air System - GX24-, CHECKING (PASSAT): Function

The Secondary Air System -GX24- blows air into the exhaust, behind the exhaust valves, via a passage in the cylinder head. The "pressure based secondary air diagnostics" function is used. In this system, the signal from Secondary Air System -GX24- is evaluated in the Engine Control Module -J623-. The injected air quantity is determined from the pressure level. This extra air injection takes place on a cold-start of the engine for about 45 - 100 sec. and serves to quickly heat the catalytic convertor(s) for improved emissions.

The Secondary Air System -GX24- contains the following components:

Special tools and workshop equipment required 

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