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The Secondary Air Injection (AIR) system causes the catalytic converter to heat up more quickly, resulting in earlier operating readiness following cold start. Due to over enrichment of the mixture during the cold start phase, there is an increased amount of uncombusted carbon monoxide in the exhaust. Secondary Air Injection (AIR) improves secondary oxidation in the catalytic converter and therefore reduces emissions. 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. Initiate output Diagnostic Test Mode (DT activate Secondary Air Injection (AIR) so valve. Secondary Air Injection (AIR) pump relay (under cover, left at bulkhead) must trigger and the Secondary Air Injection (AIR) pump motor -V101- must run.
Tags : turbo injection, air injection, fuel preparation, location overview, component location, repair group, cold start, engine control module, audi tt, air valve, v101, catalytic converter, diagnostic test, air 1, test mode
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