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Principle and function Audi A6 C6 рестайлинг

4.2l v8 4v Engine Mechanical, Engine Code(s): Bvj 1 illustration ~361 words

Principle and function

Principle

Due to the rich mixture during the cold start phase, the exhaust emissions contain an increased level of unburned hydrocarbons. The Secondary Air Injection (AIR) system improves the secondary oxidation within the catalytic converter, thereby reducing harmful emissions. The heat released by secondary oxidation shortens the start-up time of the catalytic converter considerably, as well as significantly improves emissions quality during the cold-running phase.

Function

In the cold start phase, the engine control module controls the Secondary Air Injection (AIR) pump via the pump relay. The stream of air from the Secondary Air Injection (AIR) pump opens the combination valves and allows air to flow into the exhaust system before the catalytic converter.

Scheme 697

Scheme 697: Secondary air injection (AIR) system, assembly overview
Scheme 697: Secondary air injection (AIR) system, assembly overview

1 - Secondary Air Injection (AIR) Pump Motor V101

  1. Component location: At front right in engine compartment below the longmember
  2. Removing and installing --> «Secondary Air Injection (AIR) pump, removing and installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj__secondary-air-injection-air-pump-removing)
  3. Check in "Guided Fault-Finding" operating mode

2 - Bonded rubber bushing

3 - Bracket

  1. For Secondary Air Injection (AIR) pump motor V101

4 - Nut

  1. 9 Nm

5 - Bolt

  1. 9 Nm

6 - Bolt

  1. 9 Nm

7 - Air guide pipe

  1. To Secondary Air Injection (AIR) combi-valves

8 - Bolt

  1. 22 Nm

9 - Right secondary air injection (AIR) combi-valve

  1. Component location: Back of right cylinder head
  2. Checking --> «Combination valve for secondary air injection (AIR), checking function and for leaks»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj__combination-valve-for-secondary-air-injection)
  3. Removing and installing --> «Right combination valve for Secondary Air Injection, removing and installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj__right-combination-valve-for-secondary-air)

10 - Air guide hose

  1. To Secondary Air Injection (AIR) combi-valves

11 - Left secondary air injection (AIR) combi-valve

  1. Component location: back of left cylinder head
  2. Checking --> «Combination valve for secondary air injection (AIR), checking function and for leaks»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj__combination-valve-for-secondary-air-injection)
  3. Removing and installing --> «Left combination valve for Secondary Air Injection, removing and installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj__left-combination-valve-for-secondary-air)

12 - Gasket

  1. Replace

13 - Bolt

  1. 9 Nm

14 - Bolt

  1. 9 Nm

15 - Connecting pipe

  1. To cylinder head

16 - Bolt

  1. 9 Nm

17 - Gasket

  1. Replace

18 - Air guide hose

  1. From air filter housing

19 - Air guide hose

  1. From Secondary Air Injection (AIR) Pump Motor V101 to secondary air injection combi-valves