Volkswagen Phaeton 2003, Workshop Manual

Page: 168 / 190

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2.1.1 Checking injectors for leaks and quanti‐
ty injected
Test prerequisite
• The fuel pressure must be in order. Checking
⇒ page 163 ,
Checking fuel pressure regulator and holding pressure.
• Fuel pump relays -1- and -2- must be removed from their
sockets.
Test procedure
– Remove intake manifold
⇒ page 68 Removing and installing
cylinder head; Removing and installing cylinder head cover
– Then remove fuel rail complete (fuel lines remains connected)
⇒ page 157 , dismantling and assembling fuel rail.
Checking for leaks
– Remove fuse holder cover.
– Connect remote control of V.A.G 1348 - V.A.G 1348/3A- with
Phaeton adapter cable - V.A.G 1348/3-3- to connections -1-
and -2-.
– Operate remote control.
If fuel pump runs:
– Check injectors for leaks (visual check). No more than 1 to 2
drops per minute must escape from each valve when fuel
pump is running.
If the fuel loss is greater:
– Renew defective injector.
Pay attention to the following when installing the injectors:
♦ Renew O-rings on all injectors and lightly moisten with clean
engine oil.
♦ Insert injectors vertically and in the correct position into the fuel
rail and secure with retaining clips.
♦ Fit fuel rail with injectors installed and secured onto lower part
of intake manifold and press in evenly.
Checking quantity injected
• Fuel pump relays are fitted.
– Connect test box, 121-pin - V.A.G 1598/31- and bridge test
box sockets 1 and 65 using auxiliary cables from auxiliary
measuring set - V.A.G 1594C- .
– Insert injector to be checked into measuring glass from injec‐
tion rate tester - V.A.G 1602- .
Phaeton 2003 ➤
6-cylinder injection engine - Edition 02.2014
162
Rep. gr.24 - Mixture preparation - injection