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Home >> Volkswagen >> 2001 >> Jetta GL, 2.0 S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 76 (3.2L VR6 4V Engine Mechanical, Fuel Injection Ignition, Engine Code(S): BJS) >> 26 - Exhaust system, Emission controls >> Secondary air injection (AIR) system >> Function

Secondary air injection (AIR) system: Function

WARNING: This page is about a different car, the 2004 Volkswagen R32. However, it is still accessible from the selected car via links, so may be relevant.

During cold start (+15 ° C to +35 ° C coolant temperature), air is blown behind exhaust valve by Secondary Air Injection (AIR) system for 65 seconds. This produces an oxygen rich exhaust gas, causes afterburning and reduces the heating-up phase of the catalytic converter. Activation is triggered by the Motronic Engine Control Module (ECM) J220 via Secondary Air Injection (AIR) Pump Relay J299 to Secondary Air Injection (AIR) Solenoid Valve N112 and combination valve. In addition, the Secondary Air Injection (AIR) system is switched on with a delay of approx. 20 seconds during idle for 5 seconds after every subsequent engine start (up to max. 85 ° C engine temperature) and is checked via On Board Diagnostic (OBD).

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