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Volkswagen Touareg (2003 year). Manual - part 35

Safety precautions

♦ For safety reasons, fuse nos. -13- and -14- -arrows- must be

removed from the fuse holder before opening the fuel system.

Otherwise, the fuel pump could be activated by the driver's

door contact switch.

♦ Fuse nos. 13 and 14 are located in the E-box fuse holder in

the left plenum chamber.

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.

To prevent injuries to persons and/or damage to the injection and

ignition system, the following must be observed:
♦ Do not touch or disconnect ignition cables when the engine is

running or being turned at starter speed.

♦ Switch off ignition before connecting or disconnecting injection

and ignition system wiring as well as test instrument cables.

Note the following if testers and measuring instruments have to

be used during a road test:
♦ Test and measuring instruments must always be secured to

rear seat and operated by a second person from this location.

If test and measuring instruments are operated from front pas‐

senger seat and the vehicle is involved in an accident, there is a

possibility that the person sitting in this seat may receive serious

injuries when the airbag is triggered.
♦ If the engine is to be turned at starter speed without starting:
– Pull connectors off ignition coils with output stage (cylinders

1…8).

1.6

Rules for cleanliness

When working on the fuel supply and injection system, pay careful

attention to the following „5 rules“ for cleanliness:
♦ Thoroughly clean all unions and surrounding areas before dis‐

connecting.

♦ Place removed parts on a clean surface and cover. Use only

lint-free cloths.

♦ Carefully cover opened components or seal if repairs cannot

be carried out immediately.

♦ Install clean components only. Do not remove replacement

parts from packing until immediately before installing. Do not

use parts that have not been stored in their packing (e.g. in

tool boxes etc.).

♦ When system is open: do not work with compressed air if this

can be avoided. Do not move vehicle unless absolutely nec‐

essary.

1.7

Technical data

Engine codes

AXQ

BHX

Idling check

Idling speed

rpm

670...730

Touareg 2003 ➤

1. Repairing injection system

137

AXQ

BHX

Engine control unit

System designation

Motronic ME 7.1

Part number

⇒ Spare parts cata‐

logue

⇒ Spare parts cata‐

logue

Governed speed

rpm

from approx. 6500

3) Not adjustable.

Touareg 2003 ➤

138

Checking components

Checking injectors

⇒ page 139

Checking fuel pressure regulator and holding pressure

⇒ page 142

2.1

Checking injectors

Checking injectors for leaks and quantity injected

⇒ page 139

Special tools and workshop

equipment required
♦ Remote control for V.A.G

1348 -V.A.G 1348/3A- with

adapter cable - Phaeton -

V.A.G 1348/3-3- .

♦ Injection rate tester -V.A.G

1602-

♦ Adapter cable -V.A.G

1348/3-2-

2.1.1

Checking injectors for leaks and quanti‐

ty injected

• The fuel pressure must be in order, checking

⇒ page 142

Touareg 2003 ➤

2. Checking components

139

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.

– Remove complete fuel rail (fuel supply line remains connec‐

ted)

⇒ page 133

– Remove fuse holder cover.
– Pull fuel pump relays -1- and -2- from their sockets.

– Connect remote control -V.A.G 1348/3- with adapter line -

V.A.G 1348/3-3- -arrow- to connection of fuel pump relay for

right fuel delivery unit.

– Now connect second connection of adapter cable -

V.A.G 1348/3-3- to connector connection -arrow- for fuel pump

relay for left fuel delivery unit.

Touareg 2003 ➤

140

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