Volkswagen Touareg (2003 year). Manual - part 36

positive connection -1-.

– Operate remote control -V.A.G 1348/3- .
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 secured injectors onto intake manifold and

press in evenly.

Checking quantity injected
• Fuel pump relays and fuses 13 and 14 are fitted in their sock‐

ets.

– Connect test box -V.A.G 1598/31- to engine control unit.

– Bridge test box sockets 1 and 65 using adapter cable from

auxiliary measuring set -V.A.G 1594- .

– Insert the injector to be checked into injection rate tester meas‐

uring glass -V.A.G 1602- .

– Connect a contact of injector to be tested to engine earth using

auxiliary cables from auxiliary measuring set -V.A.G 1594- .

– Connect second injector contact to remote control -

V.A.G 1348/3- using adapter cable -V.A.G 1348/3-2- .

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2. Checking components    

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battery positive (+) -1- in engine compartment.

– Switch on ignition.
– Operate remote control -V.A.G 1348/3- for 30 seconds.
– Repeat check on other injectors. Use new measuring beakers.
– Switch off ignition.
– After all injectors have been activated, place measuring beak‐

ers on a level surface and compare the quantity injected.

Specification: 95..0.115 ml per injector

If the measured values of one or more injectors are above or be‐

low the prescribed specifications:
– Renew defective injector.
Install injectors in reverse order. In the process, note the follow‐

ing:
♦ 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 secured injectors onto intake manifold and

press in evenly.

2.2

Checking fuel pressure regulator and

holding pressure

Special tools and workshop equipment required
♦ Pressure gauge -V.A.G 1318-
♦ Adapter set -V.A.G 1318/7-
♦ Adapter set -V.A.G 1318/10-
♦ Adapter set -V.A.G 1318/13-

♦ Spring-type clip pliers -VAS 6340-

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142

stant 4.0 bar.
• Fuel pump delivery is OK.

WARNING

Fuel supply lines are under pressure! Wear eye protection and

gloves  to  avoid  injuries  and  skin  contact.  Before  loosening

hose connections, wrap a cloth around the connection. Then

release pressure by carefully pulling hose off connection.

– Wrap a cloth around the threaded connection -arrow- and re‐

lease fuel pressure by quickly opening and closing connection.

– Loosen spring-type clip and disconnect fuel hose from con‐

nection on fuel rail 

⇒ Item 14 (page 133)

 .

– Now connect pressure tester -V.A.G 1318- using adapters -

V.A.G 1318/7- , -V.A.G 1318/10- and -V.A.G 1318/13- as

shown in the illustration.

– The lever on pressure tester -V.A.G 1318- -1- points in direc‐

tion of flow.

– Always secure both hose ends with clips -2-.
– Start engine and run at idling speed.
– Measure fuel pressure. Specification: approx. 4.0 bar.
If the specification is not attained:
– Check delivery rate of fuel pumps 

⇒ page 107

 .

– Renew fuel pressure regulator -2-, if necessary.
If specification is attained:
– Switch off ignition.
– Now check for leaks and holding pressure. Do this by observ‐

ing pressure drop on gauge. After 10 minutes, there must be

a residual pressure of at least 3.0 bar.

If the holding pressure drops below 3 bar:
– Check pressure tester for leaks.
– Check non-return valves of left and right fuel pumps

⇒ page 111

 and 

⇒ page 113

 .

– Switch off ignition.
When the pressure tester is removed after the test has been

completed:

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lease fuel pressure by quickly opening and closing connection.

– Remove pressure tester -V.A.G 1318- with adapters.
– Reconnect fuel hose to fuel rail and secure with spring-type

clip 

⇒ Item 14 (page 133)

 .

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