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– Pull off fuel supply line -2-.
Note
Release connection by pressing button on hose coupling.
– Connect pressure tester - VAS 6550- to connecting line - VAS
6550/3-4- and connecting line - VAS 6550/3-3- as shown.
– Open shut-off taps “A” and “B” of pressure tester - VAS 6550-
and open in flow direction.
– Close shut-off tap “C”.
– Connect the vehicle diagnostic tester .
– Switch on ignition.
– Press one after the other in the display the buttons for
Vehicle
self-diagnosis
,
Engine electronics
and
Final con-
trol diagnosis
.
– Press right arrow button
►
on display to
Final control di-
agnosis for fuel pump electronics
.
The fuel pump must now run slowly up to maximum speed.
– Read pressure shown by pressure tester - VAS 6550- .
• Specification: 5.0 … 7.0 bar
– Switch off ignition.
If the specifications are now attained:
– Check fuel supply line from fuel tank to engine for possible
damage.
If the specifications are again not attained:
– Check all couplings and fuel lines in fuel tank and fuel delivery
unit to make sure they are firmly seated and are not leaking.
If no fault is found:
– Renew fuel delivery unit
⇒ page 188
.
Touareg 2010 ➤ , Touareg 2015 ➤
6-cylinder direct-injection engine (3.6 l engine, 4V) - Edition 12.2019
3. Checking fuel pump
199
