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Home >> Volkswagen >> 2001 >> Jetta GL, 2.0 S, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 33 (1.8L - Engine Mechanical, Engine Code(S): AWD, AWW, AWP (A4 Platform)) >> 26 - Exhaust system, Emission controls >> Secondary air injection (AIR) system >> Function

Secondary air injection (AIR) system: Function

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Air is blown behind the exhaust valves by the Secondary Air Injection (AIR) system for a maximum of 100 seconds following cold start (coolant temperature of +5 ° C to +33 ° C). 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 , (change-over valve) and combination valve.

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