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– Switch on tester -VAS 6394/1- by briefly pressing the -A- but‐
ton once.
Note
♦
Press button -A- for 2 seconds, then light will be switched on
for 20 seconds.
♦
If the digital pressure gauge -VAS 6394/1- reading is not 0 bar,
carry out a zero calibration procedure ⇒ operating instruc‐
tions .
– Connect vehicle diagnosis tester to diagnostic connection.
– Switch ignition on.
– Press following buttons on display of diagnostic tester one af‐
ter the other:
Vehicle self-diagnosis
Self-diagnosis ►
01 - Engine electronics ►
011 - Measured values ►
– Select measured value block 1 4 0 and acknowledge with
Q
.
The actual fuel pressure value is shown in display zone 3, meas‐
ured by the fuel pressure sender -G247- .
– Start engine.
– Compare pressure on tester -VAS 6394/1- with actual value
displayed on vehicle diagnostic tester .
• A maximum pressure deviation of 5 bar is permissible.
– If deviation is greater than 5 bar, renew fuel pressure sender
-G247- .
WARNING
Tester -VAS 6394- is under high fuel pressure! With engine
running, detach connector from fuel pressure sender -G247- .
This reduces fuel pressure to approx. 6 bar. Switch off ignition.
Place a cleaning cloth around fuel pressure sender -G247- ,
then reduce residual pressure by carefully loosening fuel pres‐
sure sender -G247- .
– Repeat test with new fuel pressure sender -G247- and com‐
pare two readings.
If readings again fail to correspond:
– Perform line test⇒ vehicle diagnostic tester .
3.4 Checking double non-return valve
Special tools and workshop equipment required
Amarok 2011 ➤
4-cylinder injection engine (2.0 l direct injection engine, turbocharger) - Edition 02.2011
236 Rep. gr.24 - Mixture preparation - injection
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