Audi V8 Service page 35

Secondary air pump V101
The secondary air pump relay J299 activated
by the Motronic control unit connects the
power supply for the secondary air pump
motor V101. The fresh air mixed with the
exhaust gas is drawn from the air filter
housing by the secondary air pump and
released by the combination valve.
The secondary air pump in the Audi A8 has its
own air filter.
The pump is integrated in the air filter
housing where it draws in unfiltered air.
The secondary air system is active at coolant
temperatures between 0 and 55 ˚C.
The secondary air pump relay J299 and the
secondary air inlet valve N112 are activated
simultaneously.
The system is switched off after a defined air
mass has been drawn in by the motor
(information from the air mass meter).
At idling speed, this occurs after
approx. 60 - 90 seconds.
The secondary air pump in the Audi A6 does
not have its own air filter. It is mounted to the
longitudinal member and draws the filtered
air from the air filter box.
To combination valve
Air filter box
Secondary air pump,
Audi A8
The secondary air system is
described in SSP 207.
Air filter box
SSP217_049
To combination
valve
Clean air intake
Secondary air pump
Audi A6
SSP217_057
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