Diagnostic Procedure - BMW N62 Series Service Training

New Generation N62 Engine

- Diagnostic procedure

There are three stages to the diagnostic procedure, as shown in
the following diagrams.
First the activated-carbon filter (AKF) is flushed.
The second step involves a reference measurement being taken
against a reference hole.
Finally the actual leak test is carried out. The time taken for the
measurement is:
- 60-220 seconds if the system has no leaks
- 200-360 seconds if there is a leak measuring 0.5 mm
- 30-80 seconds if there is a leak measuring over 1 mm
The fuel vent valve is closed during the measurement. The time
taken for the measurement depends on how full the tank is.
Fig. 71: Current intake of the fuel tank leak diagnostic module pump
Index
RM
R
L
D
© BMW AG, Service Training
Description
Reference measurement
Reference leak Ø 0.5 mm
Leak
No leakage
Course Contents/Background Material
KT-8113
Chapter 6 P.11