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Home >> Audi >> 2017 >> RS 3 >> Repair and Diagnosis >> External Pages >> Different car >> Section 36 (GENERIC SCAN TOOL [CNTA, CNTC, CNSB] (5 Of 5) -- (A3 SEDAN)) >> Generic Scan Tool >> Diagnosis And Testing >> Diagnostic Procedures >> Secondary Air Injection Solenoid Valve - N112-, Checking >> General Description

Secondary Air Injection Solenoid Valve - N112-, Checking: General Description

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The secondary air injection system injects air into the exhaust on a cold-start of the engine for about 45 - 100 s. and serves to quickly heat the catalytic converter(s) for improved emissions. A "pressure based secondary air diagnostics" function is used. In this system, the Engine Control Module -J623- controls the Secondary Air Injection Solenoid Valve -N112-, which allows the air quantity necessary to be injected into the exhaust.

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