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Test prerequisite
• Engine oil temperature must be at least 30 °C.
• The battery voltage must be at least 11.5 V.
• All electrical consumers, e.g. lights and rear window heating,
must be switched off.
• If the vehicle is equipped with an air conditioner, it must be
switched off.
• Fuel pump relays -1- and -2- must be removed from their
sockets.
Test procedure
– Remove engine cover.
– Remove ignition coils with output stages:
⇒ page 182
.
– Remove spark plugs using spark plug socket and extension -
3122 B- .
– Check compression using compression tester - V.A.G 1763- .
Note
Using compression tester ⇒ operating instructions .
– Have a second mechanic fully depress accelerator and crank
engine.
– Operate starter until tester shows no further pressure in‐
crease.
Compression pressures:
New: 10…13 bar, wear limit: 7.5 bar
Maximum permissible difference between all cylinders: 3 bar
– Insert spark plugs using spark plug socket and extension -
3122 B- and tighten to 20 Nm.
After the test has been completed:
– Connect Vehicle diagnosis, testing and information system -
VAS 5052- .
– Carry out vehicle system test ⇒ Vehicle diagnostic tester “Gui‐
ded fault finding”.
– Finish the vehicle system test so that any fault entries stored
during assembly can be deleted automatically.
– Generate the readiness code in combination with a road test.
Observe applicable safety precautions during road test.
– Carry out road test.
– Then carry out vehicle system test again and rectify any faults
which may have occurred.
Phaeton 2003 ➤
6-cylinder injection engine - Edition 02.2014
1. Cylinder head
75
