Secondary Air System - GX24-, CHECKING: Function

The secondary air injection system 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 Injection Sensor 1 -G609- 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:

• Secondary Air Injection Solenoid Valve -N112-
• Secondary Air Injection Sensor 1 -G609-

The Secondary Air System -GX24- components cannot be serviced separately, it must be serviced as a unit.

Special tools and workshop equipment required 

• Multimeter
• Wiring Diagram
• Scan Tool