The heat produced by secondary oxidation greatly reduces start-up time for the catalytic converter, therefore improving exhaust quality during the cold start phase significantly. In the cold start phase, the ECM -2- activates the secondary air pump – 12- via the relay for Secondary Air Injection (AIR) pump -1-. Air reaches the combination valve for Secondary Air Injection (AIR) -10-. The Secondary Air Injection (AIR) valve -3- is activated in parallel, which allows the vacuum to reach the combination valve for Secondary Air Injection (AIR) -10- and the vacuum diaphragm for charge air pressure regulation -7-.
The combination valve for Secondary Air Injection (AIR). 1 – Secondary Air Injection (AIR) pump relay- J299. Motronic Engine Control Module (ECM) – J220- Pressure unit for charge air pressure regulation. Component location Overview of compon locations. Repair Manual , 1.8 Liter 4-Cyl. 5V Turbo Injection & Ignition, Engine Code(s): AMU, Repair Group 24, Fuel preparation, injection.
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