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
141
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‐
.
– 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
– 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
– Switch off ignition.
When the pressure tester is removed after the test has been
completed:
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2. Checking components
143
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
.
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144
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