VW CGRA - Page 207

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Note
When the pressure tester - VAS 6550- is to be removed, open the
shut-off tap “C” and release remaining pressure. To do this, hold
the hose of the shut-off tap “C” in a measuring container.
If the pressure does not drop now (leak on engine side):
Note
Search for leak on engine side. To do this, repeat the holding-
pressure test. This time, close shut-off tap -A- to check whether
leak actually is on engine side.
– If there is a leak on the engine side, carry out »external« check
of the fuel pipes and high-pressure pump for leaks.
If no fault can be determined, check the injectors for leaks:
– Remove spark plugs. Open shut-off valves -A- and -B-. Ac‐
tuate fuel pump with final control diagnosis.
– Check through spark plug holes whether fuel has collected on
the piston crown due to a leaking injector.
Touareg 2010 ➤ , Touareg 2015 ➤
6-cylinder direct-injection engine (3.6 l engine, 4V) - Edition 12.2019
3. Checking fuel pump 201