New Generation N62 Engine Chapter 6 P.11
Course Contents/Background Material
© BMW AG, Service Training
- 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 Description
RM Reference measurement
R Reference leak Ø 0.5 mm
L Leak
D No leakage
KT-8113
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