New Generation N62 Engine Chapter 3 P.18
Course Contents/Background Material
© BMW AG, Service Training
Secondary air pump (SLP)
The electrically-operated secondary air pump is fixed to the
engine compartment body. The pump draws out filtered fresh air
from the air cleaner housing during the warm-up phase and
supplies it to the two secondary air valves.
Once the engine has been started, the SLP is supplied with on-
board voltage by the DME via the secondary air pump relay. It
remains switched on until the engine has taken in a certain
amount of air.
The ON period may be a maximum of 90 seconds, and depends
on the following engine operating conditions:
- Coolant temperature (from -10 ºC to approximately 60 ºC)
- Air flow
- Engine speed
Secondary air valves (SLV)
Fig. 16: Secondary air valve
Index Description
1 Cylinder head lead
2 Secondary air valve
3 Secondary air pump connection
KT-8090
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