Volkswagen Touareg (2003 year). Manual - part 37

Engine control unit

Removing and installing engine control unit 

⇒ page 145

 .

Reading and clearing engine control unit fault memory

⇒ page 145

 .

3.1

Removing and installing engine control

unit

If you wish to replace the engine control unit, connect the vehicle

diagnosis, testing and information system -VAS 5051B- and carry

out the guided function „Renew control unit“.
Removing
– Switch off ignition.
– Remove windscreen wiper motor on right side: ⇒  Electrical

system; Rep. gr.  92 ; Removing and installing windscreen

wiper system .

– Release both connectors from control unit and pull off.
– Control unit can now be removed.
Installing
– Place control unit into retaining frame.
– Fit connector and lock in position.
– Install windscreen wiper motor on right side: ⇒  Electrical sys‐

tem; Rep. gr.  92 ; Windscreen wiper system .

– Install plenum chamber cover.
– Adapt new engine control unit: ⇒ Vehicle diagnostic tester;

„Guided functions“ .

3.2

Reading and erasing engine control unit

fault memory

Special tools and workshop equipment required
♦ Vehicle diagnosis, testing and information system -VAS 5051-
♦ Diagnosis cable -VAS 5051/1- or -VAS 5051/3-

Procedure
– Connect vehicle diagnosis, testing and information system -

VAS 5051- as follows:

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3. Engine control unit    

145

VAS 5051/3- to diagnostic connection.

– Start engine and run at idling speed.
Only when engine does not start:
– Switch on ignition.
Selecting operating mode:
– Press button on display for „Vehicle self-diagnosis“.
Selecting vehicle system:
– Press „01 - Engine electronics“ button on display.
The control unit identification with code as well as chassis number

and immobilizer identification number will be indicated on the dis‐

play.

Note

A print-out can be made if required. Tghen press the 

Print

 but‐

ton.

– Press 

→

 button.

Select diagnostic function:
– Press „02 - Read fault memory“ button on display.
– If no fault is stored in engine control unit „0 fault detected“ is

displayed.

– If faults are stored in the engine control unit, these are shown

one below the other on the display.

– Press 

←

 button.

– Press „05 - Clear fault memory“ button on display.
– Select „06-End output“ function.

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146

1

Removing and installing parts of ex‐

haust system

Assembly overview - exhaust manifold with starter catalytic con‐

verters and attachments 

⇒ page 148

Assembly overview - silencers with mountings 

⇒ page 153

Note

After working on the exhaust system, ensure that the system has

sufficient clearance to the bodywork. If necessary, loosen flange

on catalytic converter and realign silencers and exhaust pipes

⇒ page 154

 .

Special tools and workshop equipment required
♦ Lambda probe open ring spanner set -3337-

♦ Torque wrench -V.A.G 1332-

Touareg 2003 ➤

1. Removing and installing parts of exhaust system    

147

Assembly overview - exhaust manifold with starter catalytic converters and

attachments

1 - Nut, 25 Nm
2 - Nut, 25 Nm
3 - Exhaust manifold

❑ For cylinder bank 1.
❑ Removal only possible

with engine removed.

4 - M8 25 Nm, M10 40 Nm
5 - Lambda probe -G39- 50 Nm

❑ Bank 1, probe 1.
❑ Installed in exhaust gas

stream of cylinders 1, 2,

3 and 4.

❑ Removing and installing

⇒ page 149

6 - Starter catalytic converter

❑ Installed in exhaust gas

stream of cylinder bank

1.

7 - Lambda probe after catalyt‐

ic converter -G130- 50 Nm

❑ Bank 1, probe 2.
❑ Removing and installing

⇒ page 149

8 - Catalytic converter
9 - Mounting

❑ Installation position

⇒ page 154

 .

10 - 25 Nm
11 - To centre silencer
12 - Mounting
13 - To centre silencer
14 - Gasket

❑ Renew.

15 - M8 25 Nm, M10 40 Nm
16 - Bracket

❑ For supporting gearbox on right.

17 - Lambda probe 2 after catalytic converter -G131- , 50 Nm

❑ Bank 2, probe 2.
❑ Removing and installing 

⇒ page 149

18 - Lambda probe 2 -G108- 50 Nm

❑ Bank 2, probe 1
❑ Installed in exhaust gas stream of cylinders 5, 6, 7 and 8.
❑ Removing and installing 

⇒ page 149

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