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

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/Motor Control Module -J623- controls the Secondary Air Injection Solenoid Valve -N112-, which allows the air quantity necessary to be injected into the exhaust.

Special tools and workshop equipment required 

• Multimeter.
• Wiring Diagram.
• Scan Tool.