Touareg 2003 ➤
8-cylinder injection engine - Edition 11.2011
2
Secondary air system
Function
The secondary air system blows air in behind the exhaust valves
for max. 65 seconds after a cold start (+15°C … +35°C coolant lk
temperature). This produces an oxygen rich exhaust gas, causing
afterburning and reducing the heat-up phase of the catalytic con‐
verter. The engine control unit activates the system via the sec‐
ondary air pump relay -J299- to the secondary air inlet valve -
N112- and combination valve. Additionally, after each
subsequent engine start (up to max. 80 C engine temperature),
the secondary air system will, after a 20 second delay, switch in
for 5 seconds during idling and will be checked by the self-diag‐
nosis.
Assembly overview - removing and installing parts of secondary
air system ⇒ page 155
2.1
Assembly overview - removing and in‐
stalling parts of secondary air system
Note
Secondary air pump relay -J299- ⇒ page 156
2. Secondary air system
155
English 