VELOCITY VR 6000 VWUSA.COM SSP 823603 3.2L 3.6L VR6 FSI Engine

User Manual: VELOCITY VR 6000

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Service Training

Self Study Program 823603

VW 3.2 and 3.6 liter FSI Engine

Volkswagen of America, Inc.
Volkswagen Academy
Printed in U.S.A.
Printed 10/2006
Course Number 823603

©2006 Volkswagen of America, Inc.
All rights reserved. All information contained in this manual is
based on the latest information available at the time of printing
and is subject to the copyright and other intellectual property
rights of Volkswagen of America, Inc., its affiliated companies
and its licensors. All rights are reserved to make changes at
any time without notice. No part of this document may be
reproduced, stored in a retrieval system, or transmitted in any
form or by any means, electronic, mechanical, photocopying,
recording or otherwise, nor may these materials be modified
or reposted to other sites without the prior expressed written
permission of the publisher.
All requests for permission to copy and redistribute
information should be referred to Volkswagen of America,
Inc.
Always check Technical Bulletins and the latest electronic
repair information for information that may supersede any
information included in this booklet.
Trademarks: All brand names and product names used in
this manual are trade names, service marks, trademarks,
or registered trademarks; and are the property of their
respective owners.

Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Engine Mechanics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Engine Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Operating Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Knowledge Assessment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Note

This Self-Study Program provides information
regarding the design and function of new
models.
This Self-Study Program is not a Repair Manual.

Important!

This information will not be updated.
For maintenance and repair procedures,
always refer to the latest electronic
service information.

iii

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Overview

The 3.2L and the 3.6L V6 FSI engines belong to
the VR family of engines. Their reduced V-angle,
compared with a traditional V-engine, gives them an
extremely compact and space-saving design.
The VR engines have a long history at Volkswagen.
The VR success began in 1992 with the start of
production of the 2.8L VR6 engine. In 2002, the
VR6 was converted to four-valve technology. In 2003
the capacity of the VR6 was increased to 3.2 liters,
resulting in a power increase of up to 250 hp. Then,
in 2006, the capacity was increased to 3.6 liters,
resulting in a power increase of up to 280 hp.

Overview
This self-study program is designed for use in the
Volkswagen Group, and therefore does not address
the application of the engine in a specific vehicle.
If reference is made to a particular vehicle, this is
intended only as an example, to describe design,
operation or to help better understand this manual.

The VR engines are highly suitable for a broad range
of applications due to their compact design.

S360_371

Overview

S360_203

The new 3.2L and 3.6L V6 FSI engines are the
newest representatives of the VR engine series.

Special Features of both Engines:
• Compact size
• FSI direct gasoline injection

The displacement was increased to 3.2 liters or
3.6 liters, combined with the switch to the FSI
technology. This yields a noticeable increase in power
and torque compared with the previous engines.
The 3.6L engine has a maximum rated power of
280 hp (206 kW) and produces a maximum torque of
265 lb.fts (360 Nm).

• Four-valve technology with roller rocker arms
• Internal exhaust gas recirculation
• Single-piece variable-length intake manifold made
of plastic
• Cast iron crankcase
• Chain drive located on the transmission side with
integral drive for the high-pressure fuel pump
• Continuously variable intake and exhaust
camshafts
The use of FSI direct fuel injection technology makes
it possible to meet current Low Emission Vehicle
(LEV2) emission standards.

Overview
Technical Data for the 3.2L V6 Engine
Construction
Displacement

6 cylinders VR Engine
193.3 cu.in (3168 cm3)

Bore

3.4 in (86 mm)

Stroke

3.58 in (90.9 mm)

V Angle

10.6°

Valves per cylinder

Compression ratio

12:1

Max Output

250 hp (184 kW) @ 6250 rpm

Max Torque

243 lbs.ft (330 Nm) @ 27503750 rpm

Engine management

Motronic MED 9.1

Exhaust emission
control

Three-way catalytic converters
with O2 sensor

Emission standard

LEV2

Torque-power Curve

250
250
200

225

200

150

175

100

150
50
125
2000

4000

6000

Power in hp
Torque in lb.ft

Technical Data for the 3.6L V6 FSI Engine
Construction
Displacement

6 cylinders VR Engine
219.5 cu.in (3597 cm3)

Bore

3.5 in (89 mm)

Stroke

3.8 in (96.4 mm)

V Angle

10.6°

Valves per cylinder

S360_116

Torque-power Curve

250
250
200

225

Compression ratio

12:1

Max Output

280 hp (206 kW) @ 6200 rpm

200

Max Torque

265 lbs.ft (360 Nm) @ 25005000 rpm

175

Engine management

Motronic MED 9.1

Exhaust emission
control

Three-way catalytic converters
with O2 sensor

Emission standard

LEV2

150

100

150
50
125
2000

4000

Power in hp
Torque in lb.ft

6000
S360_115

Basics

The Variable Intake Manifold
The variable intake manifold design increases low
rpm torque and high rpm power by taking advantage
of the self-charging or “ram effect” that exists at
some engine speeds.
By “tuning” the intake manifold air duct length,
engineers can produce this ram effect for a given rpm
range. A manifold that has two different lengths of air
ducts can produce the ram effect over a broader rpm
range.

Instead of using high velocity air flow in a long
narrow manifold duct to ram more air into an engine
at low rpm and then opening a short, large diameter
duct for high rpm, the 3.2 and 3.6-liter V6 engines
take advantage of the pressure wave created by
the pressure differential that exists between the
combustion chamber and the intake manifold.
All air enters the intake manifold plenum and torque
port, then is drawn down the long intake ducts to
the cylinders.

The 3.2 and 3.6-liter V6 engines use two lengths of
air ducts but not in the same way as the dual path
manifolds used on other engines.
Intake Manifold Plenum

Torque Port

Change-Over Barrel

Performance Port

S360_370

Vacuum Motor

Basics
A second plenum called the performance port,
which is attached to a set of short manifold ducts,
joins the long intake ducts near the cylinder head. A
performance port valve, similar in design to a throttle
valve, separates the performance port from the short
ducts.
Note that the performance port does not have any
passage to the intake manifold other than through
the performance port valve. It does not have access
to the torque port and does not admit any more air
Performance Port Valve Open
Torque Port

into the cylinders than what is already drawn down
the long intake ducts.
At engine speeds below 900 rpm the performance
port is open for idling. The performance port valve is
actuated. At engine speeds between 900 rpm and
4100 rpm, the performance port is closed and the
engine produces its maximum low end torque (the
performance port valve is not actuated).
At engine speeds above 4100 rpm the performance
port is open (the performance port valve is actuated).
Performance Port Valve Closed

Performance Port

S360_353

Performance Port Valve Open

S360_352

Torque Port

Performance Port

S360_354

Performance Port Valve Close

S360_351

Basics
Performance Port Valve Actuation
Intake manifold change-over is engine speed
dependent. The Motronic Engine Control Module
J220 activates the Intake Manifold Change-Over
Valve N156, which supplies vacuum to the vacuum
solenoid that operates the performance port valve.

A vacuum reservoir with non-return valve is used
to store a vacuum supply for the performance valve
operation. This is necessary as manifold vacuum
may be insufficient to actuate the vacuum solenoid
at high engine speeds.

Performance Port Valve (Open)
To Performance Port

Vacuum Solenoid

From Torque Port

To Intake Valve

Signal from Motronic
Engine Control
Module J220

Intake Manifold
Change-Over Valve
N156
Non-Return Valve

To Fuel Pressure Regulator

S360_355

Vacuum Reservoir

Basics
Principles of Variable Resonance
Intake Manifold Operation
After combustion has taken place in a cylinder,
there is a pressure differential between the cylinder
combustion chamber and the intake manifold. When
the intake valves open, an intake wave forms in the
intake manifold. This low pressure wave moves from
the intake valve ports toward the torque port at the
speed of sound.

Performance Port Valve Closed

Torque Port

Performance Port

Intake Valve Closing

S360_356

The open end of the intake duct at the torque port
has the same effect on the intake wave as a solid
wall has on a ball. The wave is reflected back toward
the intake valve ports in the form of a high pressure
wave.

Reflection Point

Performance Port Valve Closed

Intake Valve Closing

S360_357

Basics
At an optimal intake manifold length, the maximum
pressure reaches the intake valve ports shortly
before the valves close. By this time the piston
has started back up the cylinder, compressing the
air/fuel mixture.
The pressure wave forces more air into the cylinder
against this rising compression pressure, filling the
cylinder with more air/ fuel mixture than would be
possible from just the piston moving downward on
the intake stroke alone. This adds to what is called
self-charging or “ram effect.”

Performance Port Valve Closed

Intake Valve Closing

S360_358

Pressure Wave

Performance Port Valve Closed

As engine speed increases, the high pressure wave
will have less time to reach the inlet port. Because
the pressure wave is only able to move at the
speed of sound, it will reach the intake valve ports
too late. The valves will already be closed, and the
“ram effect” cannot take place. This problem can be
solved by shortening the intake manifold.

Intake Valve Closed

S360_359

Pressure Wave Closed

Basics
In the 3.2 and 3.6-liter V6 engines, the performance
port valve turns to the performance position at
engine speeds below 900 rpm and above 4100 rpm.
This opens up the path to the performance port. The
performance port is designed so that the intake and
pressure waves will have a shorter path back to the
intake valve ports.

Performance Port Filled with Air
Performance Port Valve Open

Intake Valve Closed

S360_360

Performance Port Valve Open

The performance port is filled with air when the
intake valve ports are closed.

Intake Valve Open

S360_361

Reflection Point for Performance Port

When the intake valves open, the intake wave
moves up both manifold intake ducts toward the
torque port and the performance port at the same
speed.
Because the distance it must travel is shorter, the
intake wave reaches the open end of the intake duct
at the performance port before it reaches the open
end of the intake duct at the torque port.

Performance Port
Valve Open
Reflection Point
for Torque Port

S360_362

Basics
The performance port pressure wave is reflected
back toward the intake valve ports, and that air is
forced into the combustion chamber before the
intake valves close.
Performance Port Valve Open
Input Valve Closing
but Still Open

S360_363

Pressure Wave for Performance
Port Charges the Cylinder with Air

Pressure Wave Fills Performance Port

The pressure wave arriving too late from the torque
port is reflected by the closed intake valves and
pushes its air charge up the intake duct, filling the
performance port in preparation for the next cycle.
Performance Port Valve Open
Intake Valve Closed

S360_364

Basics
The Air Mass Meter with
Reverse Flow Recognition

Air Mass Meter

To guarantee optimal mixture composition and
lower fuel consumption, the engine management
system needs to know exactly how much air the
engine intakes. The air mass meter supplies this
information.
The opening and closing actions of the valves cause
the air mass inside the intake manifold to flow in
reverse. The hot-film air mass meter with reverse
flow recognition detects reverse flow of the air mass
and makes allowance for this in the signal it sends
to the engine control unit. Thus, the air mass is
metered very accurately.

Reverse Flow

Intake Manifold

S360_365

Design
Measurement of the
Intake Air

The electronic circuit and the sensor element of the
air mass meter are accommodated in a compact
plastic housing.
Located at the lower end of the housing is a
metering duct into which the sensor element
projects. The metering duct extracts a partial flow
from the air stream inside the intake manifold and
guides this partial flow past the sensor element. The
sensor element measures the intake and reverse air
mass flows in the partial air flow. The resulting signal
for the air mass measurement is processed in the
electronic circuit and sent to the engine control unit.

195_0 94

Cut-out Mass Airflow Sensor

S360_178

Sensor
Element

Heating Resistor
Temperature Sensor
S360_179

Intake Air Flow

Basics
Functional Principle
Two temperature sensors (T1 and T2) and a heating
element are mounted on the sensor.

Returning Air

Temperature Sensor 2

Sensor
Element

The sensors and heating element are attached to a
glass membrane. Glass is used because of its poor
thermal conductivity. This prevents heat which the
heating element radiates from reaching the sensors
through the glass membrane. This can result in
measurement errors.
Heating Resistor
S360_179b

Temperature Sensor 1

Intake Air Flow

Temperature Sensor

The heating element warms up the air above the
glass membrane. The two sensors register the same
air temperature, since the heat radiates uniformly
without air flow and the sensors are equidistant from
the heating element.

T1
T1

T2
T2
S360_366

195_0 42

Basics
Induced Air Mass Recognition
In the intake cycle, an air stream is ducted from T1
to T2 via the sensor element. The air cools sensor
T1 down and warms up when it passes over the
heating element, with the result that sensor T2 does
not cool down as much as T1.
The temperature of T1 is then lower than that of T2.
This temperature difference sends a signal to the
electronic circuit that air induction has occurred.

T1T1

T2T2
S360_367

195_0 43

Reverse Air Mass Flow
Recognition
If the air flows over the sensor element in the
opposite direction, T2 will be cooled down more
than T1. From this, the electric circuit recognizes
reverse flow of the air mass. It subtracts the reverse
air mass flow from the intake air mass and signals
the result to the engine control unit.
The engine control unit then obtains an electrical
signal: it indicates the actual induced air mass and
is able to meter the injected fuel quantity more
accurately.

T2
T2
S360_368

195_0 44

Notes

Engine Mechanics

The Cylinder Block

S360_004

The cylinder block has been significantly redesigned
compared with the 3.2L manifold injection engine.

Further innovations compared with the 3.2L manifold
injection engine include:

The goal was to obtain a displacement of 3.6 liters
without changing the exterior dimensions of the
engine. This was achieved by changing the V-angle
and the offset.

• Oil pump integral with the cylinder block

Both FSI engines, the 3.2L and the 3.6L, have the
new cylinder block. It is made of cast iron with
lamellar graphite.

• Better oil return from the cylinder block to the oil
pan
• Improved cylinder block rigidity, while reducing
weight at the same time
• Volume of coolant in the cylinder block reduced by
0.7 liter, allowing the coolant to heat up faster.

Engine Mechanics
V angle
10.6°
Cylinder Longitudinal Axis

S360_003

Crankshaft Center Axis
Offset
22 mm

The V-angle

Offset

The V-angle of the cylinder block is 10.6°.

By reducing the V-angle, the cylinder longitudinal
axis moves outward relative to the bottom of the
crankshaft.

By changing the V-angle from 15° to 10.6°, it was
possible to provide the necessary cylinder wall
thickness without changing the dimensions of the
engine.

The distance between the cylinder longitudinal axis
and the crankshaft center axis is the Offset.
The Offset is increased from 12.5 mm to 22 mm
compared with the manifold injection engine.

Engine Mechanics
Running-in Coating

Piston Recess

S360_001

The Crankshaft
It is made of cast iron and has 7 bearings, as in the
3.2L manifold injection engine.

The Pistons

The Connecting Rods

The pistons are recessed and are made of aluminum
alloy. In order to improve their break-in properties,
they have a graphite coating.

The connecting rods are not cast but milled. The
connecting rod eye is of a trapezoidal design. The
connecting rod bearings are molybdenum coated.
This provides good running-in properties and high
load capacity

The pistons are different for the cylinder bank 1 and
the cylinder bank 2. They differ in the arrangement
of the valve pockets and the combustion chamber
recess.
The location and design of the piston recess
generates a swirling motion of the injected fuel and
mixes it with the intake air.

Engine Mechanics
The Cylinder Head
Injectors 1, 3, 5

S360_006

Injectors 2, 4, 6

S360_011

High-Pressure Fuel Pump Location

S360_007

The cylinder head is made of an aluminum-siliconcopper alloy and is identical for both engines. It is a
new design as a result of the direct fuel injection.
The cylinder head has been lengthened to
accommodate the chain drive and to strengthen the
high-pressure fuel pump mounting location.
The fuel injectors for both cylinder banks are located
on the intake side of the cylinder head.

Fuel injectors of two different lengths
are required because of the two different
positions for the fuel injectors.

The fuel injector bores for cylinders 1, 3 and 5 are
located above the intake manifold flange. The fuel
injectors for cylinders 2, 4 and 6 are installed below
the intake manifold flange.
As a result of this layout, the fuel injectors for
cylinders 1, 3 and 5 pass through the cylinder head
intake manifold.
In order to compensate for the effect of the fuel
injectors on the airflow characteristics in the intake
manifold, the valve spacing for all cylinders has been
increased from 34.5 mm to 36.5 mm. This reduces
the change in airflow direction resulting from the fuel
injectors when filling the cylinders.

Engine Mechanics
Camshaft Adjustment
Vane Type Adjuster for Intake Camshaft
Vane Type Adjuster for Exhaust Camshaft

S360_012

N205 Camshaft Adjustment Valve 1

N318 Camshaft Adjustment Valve 1 (Exhaust)

By adjusting the camshafts, power and torque can
be increased, fuel consumption can be improved
and emissions reduced, depending on the load
characteristics of the engine.

Maximum adjustment of the camshafts:

The camshafts are adjusted by two vane type
adjusters. Both camshafts can be adjusted
continuously in the direction of early valve opening
and late valve opening.

Both camshaft adjusters are adjusted by two valves
with the assistance of the engine oil pressure.

To adjust the camshafts, the Engine Control Module
(ECM) actuates the solenoids:

• Intake camshaft 52° from the crankshaft angle and
• Exhaust camshaft 42° from the crankshaft angle.

Adjusting both camshafts enables a maximum valve
overlap of 42° crankshaft angle. The valve overlap
allows for internal exhaust gas recirculation.

• N205 Camshaft Adjustment Valve 1 and
• N318 Camshaft Adjustment Valve 1 (exhaust).

Engine Mechanics
Internal Exhaust Gas
Recirculation
Inlet Manifold Vacuum
Exhaust Valve

Intake Valve

Intake Valve opens
Exhaust Valve closes

Valve Overlap

Cycle 4

Cycle 1
Cycle 3

Cycle 2
S360_124

Internal exhaust gas recirculation counteracts the
formation of nitrous oxides (NOx).
Just as with external exhaust gas recirculation, the
reduced formation of NOx is based on lowering
combustion temperature by introducing combustion
gases.
The presence of combustion gases in the fresh
fuel-air mixture produces a slight oxygen deficit.
Combustion is not as hot as with an excess of
oxygen.
Nitrous oxides are formed in greater concentrations
under relatively high combustion temperatures.
By reducing combustion temperature in the engine
and with the lack of oxygen, the formation of NOx is
reduced.

Operation
During the exhaust stroke, the intake and the exhaust
valves are both open simultaneously. As a result
of the high intake manifold vacuum, some of the
combustion gases are drawn out of the combustion
chamber back into the intake manifold and swirled
into the combustion chamber with the next induction
stroke for the next combustion cycle.
Benefits of the internal exhaust gas recirculation:
• Improved fuel consumption due to reduced gas
exchange
• Partial load range expanded with exhaust gas
recirculation
• Smoother idle
• Exhaust gas recirculation possible even with a cold
engine

Engine Mechanics
Crankcase Ventilation
It prevents hydrocarbon-enriched vapors (blow-by
gases) from escaping from the crankcase into the
atmosphere. Crankcase ventilation consists of vent
passages in the cylinder block and cylinder head, the
cyclone oil separator and the crankcase ventilation
heater.

Operation
The blow-by gases in the crankcase are drawn out by
intake manifold vacuum through:

S360_064

Cyclone Oil Separator

Crankcase
Ventilation Heater

• the vent ports in the cylinder block,
• the vent ports in the cylinder head,
• the cyclone oil separator and
• the crankcase ventilation heater
The blow-by gases are then rerouted into the intake
manifold.
S360_253

Ventilation Ports in the Cylinder
Block and Cylinder Head

Crankcase Ventilation Heating
The heating element is installed in the flexible tube
from the cyclone oil separator to the intake manifold,
and prevents icing of the blow-by gases when the
intake air is extremely cold.
In the event of a defective pressure
regulator valve, the full intake manifold
vacuum and internal crankcase pressure
are constantly applied to the crankcase
ventilation. This causes a large amount
of oil to be drawn out of the crankcase,
possibly resulting in engine damage.

Heating Element

S360_026

Engine Mechanics
The Cyclone Oil Separator

Cyclone Oil Separator

Pressure Regulation Valve

The cyclone oil separator is located in the cylinder
head cover. Its function is to separate oil from the
blow-by gases from the crankcase and to return it to
the primary oil circuit.
A pressure regulator valve limits the intake manifold
vacuum from about 700 mbar to about 40 mbar.
It prevents the entire intake manifold vacuum and
the internal crankcase vacuum from affecting the
crankcase ventilation and drawing in engine oil or
damaging seals.

Oil Vent

to the Intake Manifold
S360_058

Operation
The cyclone oil separator separates the oil from
the oil vapor drawn in. It works on the principle of
centrifugal separation.
Due to the cyclone design of the oil separator, the oil
vapors drawn in are set into a rotating motion. The
resulting centrifugal force throws the oil against the
separating wall where it combines into larger drops.

Cyclone Oil
Separator

Vacuum Valve
Intake Manifold
Oil Vent Opening

While the separated oil drips into the cylinder head,
the gas particles are routed into the intake manifold
through a flexible tube.

S360_025

Inlet
Gas Exit to the
intake Manifold
Gas Particles

Oil Droplets
S360_059

Oil Vent Opening
into the Crankcase

Engine Mechanics
The Intake Manifold
Both engines have a single-piece overhead intake
manifold made of plastic.

Control Shaft with Flaps
Main Manifold

Short Resonance Pipe
Power Manifold

Crankcase Ventilation
Long Resonance Pipe

S360_021

Throttle Valve
Control Unit

Design
The variable length intake manifold consists of:
• the main manifold
• two resonance pipes of different length per
cylinder
• the control shaft

The two resonance pipes differ in length because
a long pipe is needed to achieve high torque and a
short pipe is needed to achieve high power.
The control shaft opens and closes the connection to
the power manifold.

• the power manifold
• the vacuum tank
• the intake manifold valve

Engine Mechanics
The Control Flaps
Switching between the power and torque positions
is accomplished by control flaps.

N316

The control flaps are vacuum operated by the Engine
Control Module (ECM) J623 through the Intake
Manifold Runner Control (IMRC) Valve N316. When
current is not applied to the valve, the control flaps
are open and are in the power setting.
S360_022

Control Flaps

Vacuum Tank

S360_061

Check Valve
Main Manifold

The Vacuum Tank
J623

A vacuum tank is located within the intake manifold.
A vacuum supply is maintained in this vacuum tank
and will allow to actuate the control flaps.
The air from the vacuum tank is drawn through a
check valve into the primary manifold, so that vacuum
can build up in the vacuum tank.
If the check valve is defective, the control flaps
cannot be activated.

N316

S360_060

Engine Mechanics
Function of the Variable Length
Intake Manifold
The variable length intake manifold is designed so
that a resonance is created between the timing of
the valves, the intake pulses and the vibration of the
air which produces an increase in pressure in the
cylinder and subsequently good charging efficiency in
the cylinder.

Power Setting of the Variable Intake Manifold

Torque Setting of the Variable Intake Manifold

Power Manifold

Variable Intake
Manifold Housing

Air Supply from the
Power Manifold
Control Shaft

S360_063

Air Supply from the
Intake Manifold
Control Shaft

S360_062

Engine Speed between 0 and about 1200 rpm

Engine Speed between about 1200 and 4000 rpm

The variable length intake manifold is in the power
position. Current is not applied to the intake manifold
flap control valve. The vacuum wave generated at
the beginning of the intake stroke is reflected at the
end of the power collector in the power manifold
and returns after a brief time to the intake valve as a
pressure wave.

Current is applied from the ECM to the intake
manifold flap control valve. The control flaps are closed
and close the power manifold. The cylinders draw air
through the torque manifold directly from the main
manifold.
Engine Speed above 4000 rpm
No current is applied to the intake manifold flap
control valve. As a result, the intake manifold claps
switch back to the power position.

Engine Mechanics
The Chain Drive
Intake Camshaft Drive

Exhaust Camshaft Drive

High-pressure Fuel Pump Drive

Hydraulic Chain Tensioner

Oil Pump Drive

Hydraulic Chain Tensioner
Crankshaft Pinion

S360_016

The chain drive is located on the transmission side
of the engine. It consists of the primary chain and
the camshaft chain.
Please refer to the current Repair
Manuals to adjust the valve timing. There
is a new special tool T10332 for locking
the high pressure-pump pinion wheel.

The primary chain is driven by the crankshaft. It
drives the camshaft chain and the oil pump via a
sprocket wheel.
The two camshafts and the high-pressure fuel pump
are driven by the camshaft chain.
Both chains are kept at the precise tension by
hydraulic tensioners.

Engine Mechanics
The Ribbed V-belt Drive
Tensioning Pulley

Alternator Drive

Coolant
Pump Drive

Idler Pulley
Crankshaft V-belt
Drive Pulley
Air-Conditioning
Compressor Drive

Idler Pulley
S360_015

Cover Fabric

Construction of
the Poly-V Drive
Belt

Cover Layer
Polyester Drive-ply
Substructure
Drive Belt Pulley
S360_170

The ribbed V-belt is a single-sided poly-V belt. Even at
high speed, it runs quietly and vibration-free. The belt
is driven by the crankshaft through the V-belt pulley
with vibration damper.

The belt drives the air-conditioning compressor, the
alternator and the coolant pump.
The V-belt is always kept at the correct tension by a
belt tensioner.

Engine Mechanics
Oil Circulation
Camshaft Adjuster

Camshaft Adjuster

Hydraulic Valve Lifter
Camshaft Bearing

High-pressure Fuel
Pump Drive

Chain Tensioner
Chain Tensioner
Oil Pump

Oil Tank
Spray Jets for
Piston Lubrication

Crankshaft Bearing

Oil filter Cooler Module

Oil Tank

Oil Return

Intake Duct

Oil Pan
S360_122

Oil pressure is generated by a self-priming duocentric
oil pump. It is installed in the cylinder block and is
chain driven.
The installation of the oil pump results in a longer
path for the oil. This can be a disadvantage when
starting the lubrication of engine components. For
this reason, oil is drawn from an oil tank located
behind the oil pump to ensure the initial supply of oil.

The oil pump draws oil from the oil pan and then
pumps it to the oil filter-cooler module. In that
module, the oil is cleaned and cooled before it is
transferred to the lubrication points in the engine.

Engine Mechanics
The Oil Pump with Oil Tank
The oil tank is formed in the cylinder block by a cavity
behind the oil pump. Its volume is approximately
280 ml and does not drain even after the engine is
switched off.
Cylinder Head

Oil Tank
Drive Pinion

Service Opening
Oil Pump

Cylinder Block
S360_174

The Service Opening for the Oil Pump
The service opening provides access to the oil pump
excess-pressure piston. After removing the cover
bolt and a second internal bolt, the oil pump pressure
piston can be removed and its condition can be
inspected without having to remove the drive chain.

S360_052

Cover Screw

Pressure Piston

S360_056

Engine Mechanics
The Oil Filter Cooler Module
The oil filter cooler module is an assembly made of
the oil filter, oil cooler, check valve and filter bypass
valve.

Oil Cooler

S360_019

Oil Filter

The Oil Return
The returning oil is directed through three return
ducts in the cylinder head into a central oil return
duct in the cylinder block.
The oil then flows into the oil pan to the bottom of
the sump. In addition to the central oil return, oil is
returned to the oil pan from the front of the engine
through the timing chain housing.

S360_219

Oil Return

Engine Mechanics
Coolant Circulation
Legend

1. Coolant Tank
2. Heater Exchanger for Heating
3. Coolant Pump
4. Transmission Fluid Cooler
5. Thermostat
6. Oil Cooler
7. Check Valve
8. Recirculation Pump V55
9. Check Valve
10. Auxiliary Cooler
11. Radiator

6
7

9
10
11

S360_213

The coolant is circulated by the mechanical coolant
pump. The pump is driven by the V-belt.

Depending on the vehicle, there may be an auxiliary
cooler in the coolant circuit (10).

There are 9 liters (2.4 gallons) of coolant in the
cooling system. The total amount of coolant has
been reduced by 2 liters in comparison to the
3.2L manifold injection engine. The reduced coolant
allows the engine to reach operating temperature
faster.

The check valves are included in the coolant circuit
in order to prevent any coolant return flow.

Coolant circulation is controlled by the expansion
thermostat.

Engine Mechanics
The Recirculation Pump V55
The Recirculation Pump is an electrical pump. It
is integrated into the engine coolant circuit and is
actuated by the ECM based on a characteristic map.
After the engine has been turned off, and with no
driving airflow, the Recirculation Pump is switched
on depending on coolant temperature.

S360_169

The Coolant Fan
The V6 FSI engine has two electric Coolant Fans.
The Coolant Fans are activated as needed by the
ECM.
The Engine Control Module (ECM) J623 signals the
need for radiator cooling to the Coolant Fan Control
(FC) Module J293.

Engine Control Module
(ECM) J623
Coolant Fan
V7

Depending on the need, the Coolant Fan Control
(FC) Module J293 then supplies current to one or
both of the fans. Current is supplied to the Cooling
Fan Control (FC) Module J293 by the Motronic
Engine Control Module (ECM) Power Supply Relay
J271 and by the Vehicle Electrical System Control
Module J519.
The fans can also be switched on by the Coolant
Fan Control (FC) Module after the engine has been
turned off.

Motronic Engine
Control Module
(ECM) Power
Supply Relay
J271

Coolant Fan
2 V177

S360_171

In order to turn on the fans when the engine has
been turned off, the Coolant Fan Control (FC)
Module has a connection to terminal 30.

Terminal 30

Vehicle
Electrical
System
Control
Module J519

Coolant
Fan Control
(FC) Control
Module J293

Engine Mechanics
The Exhaust System
3.2-liter V6 FSI Engine
G39

Primary Catalytic Converter
G130

G131

G108

The exhaust system for the 3.2L engine has a
primary ceramic catalytic converter for each cylinder
bank.

S360_117

Exhaust gas quality is monitored by two oxygen
sensors upstream and downstream of the catalytic
converters.
The exhaust system complies with the Low
Emission Vehicle (LEV) 2 emission standards.

3.6-liter V6 FSI Engine
G39
Pre-Catalytic Converter

Primary Catalytic Converter

G130

S360_118

G108

G131

The exhaust system for the 3.6L FSI engine is
equipped with two pre-catalytic converters and two
main catalytic converters.

The exhaust system complies with the LEV 2
emission standards.

Exhaust gas quality is monitored by two oxygen
sensors upstream of the pre-catalytic converters and
two oxygen sensors downstream of the pre-catalytic
converters.

Engine Mechanics
FSI Technology
Contributing Factors
System Pressure
Start of Actuation
End of Actuation

Valve Timing

Intake Manifold Shape
Air Flow

Valve Lift
Valve Diameter

Fuel Flow
Spray Cone
Spray Angle

Recess Shape

S360_035

Direct gasoline injection requires precise timing of
the combustion process.
The factors affecting the combustion process are:
• Cylinder bore and stroke
• Shape of the recess in the piston surface

Stroke
Bore
Engine rpm

In order to determine the optimal airflow
characteristics and as a result define the optimal
piston shape for both banks of cylinders, Doppler
Global Velocimetry was used. This procedure makes
it possible to study airflow characteristics and mixture
formation while the engine is running.

• Volumetric efficiency of the fresh air supplied

With the help of this procedure and by modifying the
characteristics of the fuel injectors it was possible
to equalize and match airflow velocities and mixture
formation in the combustion chambers for both
cylinder banks.

• Fuel injector characteristics (spray cone, spray
angle, flow amount, system pressure and timing)

The engine operation is entirely homogenous.

• Valve diameter and lift
• Valve timing
• Geometry on the intake ports

• Engine rpm
An essential part in the optimization of the
combustion performance is the study of airflow
characteristics in the combustion chamber. The
mixture formation is substantially affected by the flow
characteristics of the intake air and the injected fuel.

The homogenous split catalytic converter heating
process for heating the catalytic converter is new.

Notes

Engine Mechanics
The Fuel System

Low-Pressure Line

G6
Transfer Fuel Pump (FP)
G247 Fuel Pressure Sensor
G410 Low Fuel Pressure
Sensor
J538 Fuel Pump (FP) Control
Module
J623 Engine Control Module
(ECM)
N276 Fuel Pressure Regulator
Valve

Pressure
Relief Valve

Fuel Filter

Pressure Retention Valve

The Low-Pressure Fuel System
The low-pressure system transfers fuel from the
fuel tank. The transfer fuel pump is activated by the
ECM through the Fuel Pump (FP) Control Module
depending on the requirements at a working pressure
between 2 and 5 bar.

Operation
The signal from the Low Fuel Pressure Sensor G410
constantly informs the ECM of the current fuel
pressure.
The ECM compares the current pressure to the
required fuel pressure. If the current fuel pressure
is not adequate to meet the fuel needs, the ECM
activates the Fuel Pump (FP) Control Module J538.

This control module then activates the transfer
fuel pump, which increases the working pressure.
When the fuel requirement drops again, the working
pressure at the pump drops accordingly.
The pressure retention valve maintains the fuel
pressure when the engine is switched off. If the fuel
line is ruptured in an accident, the pressure retention
valve helps to prevent fuel from escaping.
The pressure relief valve opens at a pressure of
93 psi (6.4 bar) and thus prevents excessive fuel
pressure in the low-pressure line.
Excess fuel can flow back into the fuel tank.

Engine Mechanics

Distributor Rail Cylinder Bank 1
G410
High-Pressure
Fuel Pump

High-Pressure
Line

Fuel Injector
Cylinder 1

Fuel Injector
Cylinder 3

Fuel Injector
Cylinder 5

N276
Distributor Rail Cylinder Bank 2
G247
J623

Fuel Injector
Cylinder 2

J538

Fuel Injector
Cylinder 4

Fuel Injector
Cylinder 6

S360_321

The High-Pressure Fuel System
The Fuel Pressure Sensor G247
The Fuel Pressure Sensor G247 is installed in the
fuel distributor of the cylinder bank 2 and informs the
ECM of current pressure in the high-pressure fuel
system.
The Fuel Pressure Regulator Valve N276
The Fuel Pressure Regulator Valve N276 is threaded
into the high-pressure fuel pump and regulates the
pressure in the high-pressure fuel system according
to the signal from the ECM.

The Pressure Relief Valve
The Pressure Relief Valve is located on the fuel
distributor of the cylinder bank 1.
The valve opens a connection to the low-pressure
fuel system when the fuel pressure in the highpressure fuel system is over 1,740 psi (120 bar).

Engine Mechanics
The High-Pressure Fuel Pump

Low-Pressure Fuel Line

High-Pressure Fuel Line

The High-Pressure Fuel Pump is located on the
cylinder head and is a piston pump. It is driven by the
camshaft and generates a fuel pressure of 1,595 psi
(110 bar).

The High-Pressure Fuel Pump Drive
The High-Pressure Fuel Pump is driven by a pinion
gear with dual cam.
The dual cam actuates the pump piston through a
roller. The pump piston generates the high pressure
in the pump.

S360_123

Low Fuel Pressure
Sensor G410

Fuel Pressure Regulator
Valve N276

High-Pressure
Fuel Pump

Pump Piston
Cylinder Head
Cam Follower

S360_038

Fuel Pump Drive

Dual Cam

Pinion Gear

In order to install the camshaft roller
chain, the High-Pressure Fuel Pump
pinion must be locked with special tool
T10332.
Please refer to the Volkswagen SelfStudy Program 821503 “The 2.0L
FSI Turbocharged Engine Design and
Function” for more information about
the High-Pressure Fuel Pump.

Roller
Dual Cam
Pinion Gear
S360_173

Engine Mechanics
Exhaust Valve

Intake Valve

Fuel Injector Characteristics

Fuel Injector
Piston Recess

Valve Angle Cylinder 1, 3, 5

Since the fuel injectors are inserted from the same
side for both banks of cylinders, the piston recess
must be shaped differently. This is necessary
because the fuel injectors and the intake valves
for both cylinder banks are positioned at different
angles.
The shape and orientation of the fuel injection play
an important role along with the quantity of fuel
injected and the length of injection.

S360_252

Late Pre-Injection
Valve
Pocket

Valve Angle Cylinder 2, 4, 6

Late Ignition Timing
Catalytic Converter

S360_251

S360_159

Hotter Combustion
Gases heat up the
Catalytic Converter

The Homogenous Split Catalytic
Converter Heating Process
The Homogenous Split Catalytic Converter Heating
Process brings the catalytic converters to operating
temperature quickly after a cold start.
To achieve this, the fuel is injected twice during one
combustion cycle. The first injection takes place in
the intake stroke. This achieves an even distribution
of the fuel-air mixture.

In the second injection, a small amount of fuel is
additionally injected shortly before ignition Top Dead
Center (TDC). The late injection increases exhaust
gas temperature. The hot exhaust gas heats up
the catalytic converter so that it reaches operating
temperature more quickly.

Engine Management

System Overview
Sensors

Engine Speed (RPM) Sensor G28

Mass Air Flow (MAF) Sensor G70
Throttle Position (TP) Sensor G79
Accelerator Pedal Position Sensor 2 G185
Clutch Position Sensor G476
Throttle Valve Control Module J338 with
Throttle Drive Angle Sensor 1 (for Electronic
Power Control (EPC)) G187
Throttle Drive Angle Sensor 2 (for Electronic
Power Control (EPC)) G188
Camshaft Position (CMP) Sensor G40
Camshaft Position (CMP) Sensor 2 G163

Engine Control
Module (ECM)
J623

Engine Coolant Temperature (ECT) Sensor G62
Engine Coolant Temperature (ECT) Sensor (on
Radiator) G83
Knock Sensor (KS) 1 G61
Knock Sensor (KS) 2 G66

Brake Light Switch F

Fuel Pressure Sensor G247
Low Fuel Pressure Sensor G410
CAN Data-bus
Oil Level Thermal Sensor G266
Heated Oxygen Sensor (HO2S) G39
Heated Oxygen Sensor (HO2S) 2 G108
Oxygen Sensor (O2S) Behind Three Way
Catalytic Converter (TWC) G130
Oxygen Sensor (O2S) 2 Behind Three Way
Catalytic Converter (TWC) G131

S360_154

Engine Management
Actuators
Fuel Pump (FP) Control Module J538
Transfer Fuel Pump (FP) G6

Cylinder 1-6 Fuel Injector
N30, N31, N32, N33, N83, N84

Ignition Coil 1-6 with Power Output Stage
N70, N127, N291, N292, N323, N324

Throttle Valve Control Module J338 with
Throttle Drive (for Electronic Power Control (EPC))
G186

Fuel Pressure Regulator Valve N276

Evaporative Emission (EVAP) Canister Purge
Regulator Valve N80

Intake Manifold Runner Control (IMRC) Valve N316

Camshaft Adjustment Valve 1 N205
Camshaft Adjustment Valve 1 (exhaust) N318
Instrument Cluster
Control Module J285

Oxygen Sensor (O2S) Heater Z19
Oxygen Sensor (O2S) 2 Heater Z28
Oxygen Sensor (O2S) 1 (behind Three Way Catalytic
Converter (TWC)) Heater Z29
Oxygen Sensor (O2S) 2 (behind Three Way Catalytic
Converter (TWC)) Heater Z30
Coolant Fan Control (FC) Control Module J293
Coolant Fan V7
Coolant Fan 2 V177
Recirculation Pump Relay J160
Recirculation Pump V55
S360_155

Engine Management
Sensors
Engine Speed (RPM) Sensor G28
The Engine Speed Sensor is threaded into the side of
the cylinder block. It scans the sensor wheel on the
crankshaft.
Signal Utilization
The engine speed and the exact position of the
crankshaft relative to the camshaft are determined
by the engine speed sensor. Using this information,
the injection quantity and the start of injection are
calculated.
Effects of Signal Failure
In case of signal failure, the engine is switched off
and cannot be restarted.

S360_111

Engine Management
Mass Airflow Sensor G70
The 6th generation hot film mass airflow sensor
(HFM6) is used in the 3.2L and the 3.6L FSI engine.
It is located in the intake manifold and operates
based on a thermal measurement principle, as did its
predecessor.
Characteristics
• Micromechanical sensor element with reverse
current detection
• Signal processing with temperature compensation

Connector

• High measurement accuracy
• High sensor stability

Sensor Electronics

Drawn-in Air

S360_183

Signal Utilization
The signal from the mass airflow sensor is used
in the ECM to calculate the volumetric efficiency.
Based on the volumetric efficiency, and taking into
consideration the lambda value and ignition timing,
the control module calculates the engine torque.

Bypass Channel

Effects of Signal Failure
If the mass airflow sensor fails, the engine
management system calculates a substitute value.

Engine Management
The Throttle Position (TP) Sensor
G79 and the Accelerator Pedal
Position Sensor 2 G185
The two throttle position sensors are part of the
accelerator pedal module and are contact-free
sensors.
The ECM detects the driver’s request from these
sensor signals.

G79 and G185

Accelerator Pedal

Signal Utilization
The ECM uses the signals from the Throttle Position
Sensor to calculate the fuel injection volume.
Effects of a Signal Failure
If one or both sensors fails, an entry is made in
the DTC memory and the error light for electronic
power control is switched on. Comfort functions
such as cruise control or engine drag torque control
are switched off.

S360_150

Clutch Position Sensor G476
The Clutch Position Sensor is a mechanically
actuated switch located on the clutch pedal. It is
only required on vehicles with manual transmission.

Sensor Cylinder

Clutch Pedal Module

Signal Utilization
The signal is used to control the cruise control and
to control the ignition timing and quantity of fuel
when shifting.
Effects of a Signal Failure
The cruise control cannot be turned on. It also
results in driveability problems, such as engine
jerking and increased RPM when shifting.

G476

S360_163

Engine Management
The Throttle Drive Angle Sensor 1
G187 and Throttle Drive Angle
Sensor 2 G188 in the Throttle Valve
Control Unit

Throttle Valve Housing

Throttle Valve Drive

These sensors determine the current position of the
throttle valve and send this information to the ECM.
Signal Utilization
The ECM recognizes the position of the throttle valve
from the angle sensors signals. The signals from
the two sensors are redundant, meaning that both
sensors provide the same signal.
Throttle Valve
G187 and G188

Effects of a Signal Failure

S360_238

Example 1

Example 2

The ECM receives an implausible signal or no signal
at all from an angle sensor:

The ECM receives an implausible signal or no
signal from both angle sensors:

• An entry is made in the DTC memory and the error
light for electric throttle operation is switched on

• An entry is made for both sensors in the DTC
memory and the error light for electric throttle
operation is switched on

• Systems which affect torque, (e.g. cruise control
system or engine drag torque control), are
switched off
• The load signal is used to monitor the remaining
angle sensor

• The throttle valve drive is switched off
• The engine runs only at an increased idle speed
of 1,500 RPM and no longer reacts to the
accelerator pedal

• The accelerator pedal responds normally

Engine Management
The Camshaft Position Sensors
(CMP) G40 and G163
Both Hall sensors are located in the engine timing
chain cover. Their task is to communicate the
position of the intake and exhaust camshafts to the
ECM.
To do this, they scan a quick-start sensor wheel
which is located on the individual camshaft.
The ECM recognizes the position of the intake
camshaft from the Camshaft Position (CMP) Sensor
G40, and recognizes the position of the exhaust
camshaft from Camshaft Position (CMP) Sensor 2
G163.

G40

G163

S360_108

Signal Utilization
Using the signal from the Camshaft Position Sensors,
the precise position of the camshaft relative to the
crankshaft is determined very quickly when the
engine is started. Used in combination with the
signal from the Engine Speed (RPM) Sensor G28, the
signals from the Camshaft Position Sensors allow to
detect which cylinder is at TDC.
The fuel can be injected into the corresponding
cylinder and ignited.

Effects of a Signal Failure
In case of signal failure, the signal from the Engine
Speed (RPM) Sensor G28 is used instead. Because
the camshaft position and the cylinder position
cannot be recognized as quickly, it may take longer
to start the engine.

Engine Management
The Engine Coolant Temperature
(ECT) Sensor G62
This sensor is located at the coolant distributor above
the oil filter on the engine and it informs the ECM of
the coolant temperature.
Signal Utilization
The coolant temperature is used by the ECM
for different engine functions. For example, the
computation for the injection amount, compressor
pressure, start of fuel delivery and the amount of
exhaust gas recirculation.
Effects of a Signal Failure
If the signal fails, the ECM uses the signal from the
Engine Coolant Temperature (ECT) Sensor G83.

S360_164

G62

Radiator Inlet

The Engine Coolant Temperature
(ECT) Sensor (on the Radiator) G83
The Engine Coolant Temperature Sensor (on the
Radiator) G83 is located in the radiator output line
and measures the coolant exit temperature.
Signal Utilization
The radiator fan is activated by comparing both
signals from the Engine Coolant Temperature Sensors
G62 and G83.
Effects of a Signal Failure
If the signal from the Engine Coolant Temperature
Sensor G83 is lost, the first speed engine coolant fan
is activated permanently.

Radiator Outlet

G83

S360_182

Engine Management
Knock Sensor (KS) 1 G61 and
Knock Sensor (KS) 2 G66
The Knock Sensors are threaded into the crankcase.
They detect combustion knocks in individual
cylinders. To prevent combustion knock, a cylinderselective knock control overrides the electronic
control of the ignition timing.

S360_158

S360_157

G61

Signal Utilization
Based on the knock sensor signals, the ECM
initiates ignition timing adjustment in the knocking
cylinder until knocking stops.

G66

Effects of a Signal Failure
In the event of a knock sensor failure, the ignition
timing for the affected cylinder group is retarded.
This means that a safety timing angle is set in the
“late“ direction. This can lead to an increase in fuel
consumption. Knock control for the cylinder group of
the remaining knock sensor remains in effect.
If both knock sensors fail, the engine management
system goes into emergency knock control in which
the ignition angle is retarded across the board so
that full engine power is no longer available.

Engine Management
The Brake Light Switch F
The Brake Light Switch is located on the tandem
master cylinder. It scans a magnetic ring on the
tandem master cylinder piston using a contactless
Hall Element.
This switch provides the ECM with the signal “Brake
actuated“ via the CAN data bus drive.
Signal Utilization
When the brake is operated, the cruise control
system is deactivated. If the signal “accelerator
pedal actuated“ is detected first and “brake
actuated“ is detected next, the idle speed is
increased.

S360_177

Effects of a Signal Failure
If the sensor signal is lost, the amount of fuel
injected is reduced and the engine has less power.
The cruise control system is also deactivated.

The Fuel Pressure Sensor G247
The Fuel Pressure Sensor is located on the lower
fuel distributor pipe. It measures the fuel pressure in
the high-pressure fuel system.
S360_110

Signal Utilization
The Engine Control Module (ECM) analyzes the
signal and regulates the fuel high pressure through
the Fuel Pressure Regulator Valve N276 in the highpressure pump.

G247

Effects of a Signal Failure
If the Fuel Pressure Sensor fails, the fuel pressure
regulator valve is activated at a fixed value by the
ECM.

Engine Management
The Low Fuel Pressure Sensor G410
The Low Fuel Pressure Sensor is located on the highpressure fuel pump. It measures the fuel pressure in
the low-pressure fuel system.
Signal Utilization
The signal is used by the ECM to regulate the lowpressure fuel system. Based on the signal from the
sensor, a signal is sent by the ECM to the Fuel Pump
Control Module J538, which then regulates the fuel
pump as needed.
Effects of a Signal Failure
If the Low Fuel Pressure Sensor fails, the fuel
pressure is not regulated as needed. Fuel pressure is
maintained at a constant 72 psi (5 bar).

S360_109

G410

The Oil Level Thermal Sensor G266
The Oil Level Thermal Sensor is threaded into the
oil pan from below. Its signal is used by several
control modules. The Instrument Cluster Control
Module J285 uses this signal to display the engine oil
temperature.
Signal Utilization
The ECM receives the signal over the CAN data bus
and uses the oil temperature signal to control the
retarded setting of the exhaust camshaft at high oil
temperatures.
Effects of a Signal Failure
The control module uses the signal from the Coolant
Temperature Sensor instead of the oil temperature
signal.

S360_156

Engine Management
The Heated Oxygen Sensors
(HO2S) G39 and the Heated
Oxygen Sensors (HO2S) 2 G108

Broadband Oxygen Sensor

A broadband oxygen sensor is assigned to each precatalytic converter as a pre-catalytic oxygen sensor.
Using the broadband oxygen sensors, a wide range
of oxygen concentration in the exhaust gas can be
calculated. Both oxygen sensors are heated to reach
operating temperature more quickly.
Signal Utilization
The signals from the Heated Oxygen Sensors are
one of the variables used in calculating the injection
timing.

The Oxygen Sensor (O2S) Behind
Three Way Catalytic Converter
(TWC) G130 and the Oxygen
Sensor (O2S) 2 Behind Three Way
Catalytic Converter (TWC) G131
The planar oxygen sensors are located downstream
of the pre-catalytic converter. They measure the
remaining oxygen content in the exhaust gas. Based
on the amount of oxygen remaining in the exhaust
gas, the ECM can draw conclusions about the
catalytic converter operation.
Signal Utilization
The Engine Control Module uses the signals from
the post-catalytic converter oxygen sensors to check
the catalytic converter operation and the closed-loop
oxygen control system.

S360_222

Effects of a Signal Failure
If the pre-catalytic converter oxygen sensor fails,
there is no closed loop control. The fuel injection
adaptation is not available. An emergency running
mode is enabled using an engine characteristics map.

Planar Oxygen Sensor

S360_224

Effects of a Signal Failure
If the post-catalytic converter oxygen sensor fails,
the closed loop operation continues. The operation
of the catalytic converter can no longer be checked.

Engine Management
The Actuators
Camshaft Adjustment Valve 1
N205, Camshaft Adjustment Valve
1 (exhaust) N318
The solenoid valves are integrated in the camshaft
adjustment housing. They distribute the oil pressure
based on the ECM signals for the adjustment
direction and adjustment travel at the camshaft
adjusters.
Both camshafts are continuously adjustable:
• Intake camshaft at 52° of the crankshaft angle
• Exhaust camshaft at 42° of the crankshaft angle
• Maximum valve overlap angle 47°
The exhaust camshaft is mechanically locked when
no oil pressure is available (engine not running).

Effects of a Signal Failure
If an electrical connection to the camshaft adjusters
is defective or if a camshaft adjuster fails because it
is mechanically seized or as a result of inadequate oil
pressure, there is no camshaft adjustment.

S360_161

N205

N318

Engine Management
The Transfer Fuel Pump (FP) G6 and
the Fuel Level Sensor G
The Transfer Fuel Pump and the Fuel Filter are
combined in the Fuel Transfer Unit. The Fuel Transfer
Unit is located in the fuel tank.
Operation
The Transfer Fuel Pump transfers the fuel in the lowpressure fuel system to the high-pressure fuel pump.
It is activated by a Pulse Width Modulation (PWM)
signal from the Fuel Pump Control Module.

S360_190

The Transfer Fuel Pump transfers as much fuel as the
engine requires at any point in time.
Effects of a Failure
If the Transfer Fuel Pump fails, engine operation is
not possible.

The Fuel Pressure Regulator Valve
N276
The Fuel Pressure Regulator Valve is located on the
underside of the High-Pressure Fuel Pump.
The ECM regulates the fuel high-pressure through
the Fuel Pressure Regulator Valve at a level between
507 and 1,450 psi (35 and 100 bar).
Effects of a Failure
The ECM goes into emergency running mode.

S360_162

High-Pressure Fuel
Pump

N276

Engine Management
The Ignition Coils 1-6 with Power
Output Stage N70, N127, N291,
N292, N323, N324
The ignition coil and power output stage are
one component. The ignition timing is controlled
individually for each cylinder.
Effects of a Failure
If an ignition coil fails, fuel injection for the affected
cylinder is switched off. This is possible for a
maximum of two cylinders.

S360_192

Ignition Coils

The Evaporative Emission (EVAP)
Canister Purge Regulator Valve N80
The Evaporative Emission Canister Purge Regulator
Valve is located on the front (belt drive side) of the
engine and is triggered by the ECM. The fuel vapors
collected in the evaporative emission canister
are sent for combustion and thus the evaporative
emission canister is emptied.
Effects of a Signal Failure
If the current is interrupted, the valve remains closed.
The fuel tank is not vented to the engine.

S360_191

N80

Engine Management
The Cylinders 1-6 Fuel Injectors
N30, N31, N32, N33, N83, N84
The High-Pressure Fuel Injectors are inserted into
the cylinder head. They are triggered by the ECM in
accordance with the firing orders. When triggered,
they spray fuel directly into the cylinder.
Due to the design of the engine, injection takes
place from one side. For this reason, the fuel
injectors for cylinder bank 1, 3 and 5 are longer than
the fuel injectors for cylinder bank 2, 4 and 6.

S360_137

Effects of a Failure
A defective fuel injector is recognized by misfire
detection and is no longer triggered.

Throttle Valve Housing

G186

Throttle Drive for Electronic Power
Control (EPC) G186
The Throttle Drive for Electronic Power Control is an
electrical motor which operates the throttle valve
through a gear mechanism.
The range of adjustment is stepless from idle to the
wide-open throttle position.
S360_195

Effects of a Failure
If the throttle drive fails, the throttle valve is
automatically pulled to the emergency running
position. An entry is made in the DTC memory
and the error lamp for electronic power control is
switched on.

Throttle Valve

Engine Management
Intake Manifold Runner Control
(IMRC) Valve N316
The Intake Manifold Runner Control Valve is
located on the variable intake manifold and is an
electropneumatic valve.
When it is activated, it operates the intake manifold
flap to change the length of the intake manifold.
Effects of a Failure
If the valve fails, the intake manifold flaps are pulled
by a mechanical spring to an emergency running
position. This position corresponds to the power
setting of the intake manifold.

S360_051

N316

The Recirculation Pump V55
The Recirculation Pump is activated by the ECM.
It assists the mechanical coolant pump when the
engine is running. After the engine is turned off and
with a lack of moving air resulting from the vehicle
motion, the Recirculation Pump may be switched on
depending on the coolant temperature, to prevent
heat buildup in the engine.
Effects of a Failure
If the Recirculation Pump fails, the engine may
overheat.
S360_045

V55

Engine Management
Oxygen Sensor (O2S) Heaters Z19,
Z28, Z29 and Z30
The job of the Oxygen Sensor Heater is to bring
the ceramic of the oxygen sensor rapidly up to its
operating temperature of approx. 1652°F (900°C)
when the engine is started and the temperature is
low. The oxygen sensor heater is controlled by the
ECM.

S360_193

Oxygen Sensor Heater

Effects of a Failure
The engine can no longer be regulated with respect
to the emissions.

Notes

Operating Diagrams
The Control Modules in the
CAN Data Bus
The schematic below shows the Engine Control
Module J623 integrated into the CAN data bus
structure of the vehicle. Information is exchanged
between the control modules over the CAN data
bus.
J743
J217
J104
J623

J533
J285

J257
J519
J234

S360_175

Legend
Engine Control Module (ECM)
ABS Control Module
Transmission Control Module (TCM)*
Airbag Control Module
Instrument Cluster Control Module
Vehicle Electrical System Control Module
Steering Column Electronic Systems Control
Module
J533 Data Bus On Board Diagnostic Interface
J743 Direct Shift Gearbox (DSG) Mechatronic*
J623
J104
J217
J234
J285
J519
J527

Color coding
Powertrain CAN-bus
Comfort system CAN-bus
Infotainment CAN-bus

* Either J217 or J743 will be used.

Diagrams
OperatingOperating
Diagrams

J519

K30
K15

G130

G39

J160

J271

J670

Z19 Z29

J623

N70

N127

N291

N292

N323

N324

J257
N30

N31

S360_165

G39 Heated Oxygen Sensor (HO2S)
G130 Oxygen Sensor (O2S) Behind Three Way
Catalytic Converter (TWC)
J160 Recirculation Pump Relay
J271 Motronic Engine Control Module (ECM)
Power Supply Relay
J519 Vehicle Electrical System Control Module
J623 Engine Control Module (ECM)
J670 Motronic Engine Control Module (ECM)
Power Supply Relay 2
N30 Cylinder 1 Fuel Injector

N31
N70
N127
N291
N292
N323
N324
Z19
Z29

Cylinder 2 Fuel Injector
Ignition Coil 1 with Power Output Stage
Ignition Coil 2 with Power Output Stage
Ignition Coil 3 with Power Output Stage
Ignition Coil 4 with Power Output Stage
Ignition Coil 5 with Power Output Stage
Ignition Coil 6 with Power Output Stage
Oxygen Sensor (O2S) Heater
Oxygen Sensor (O2S) 1 (behind Three Way
Catalytic Converter (TWC)) Heater

Operating Diagrams

J519

G266
CAN

J285
F

J538
G1

N276

G21

J623

G28

G61

G66

G79

J338

G185
G186

G187

G188
S360_166

F
F1
G
G1
G5
G6
G21
G28
G61
G66
G79
G185

Brake Light Switch
Oil Pressure Switch
Fuel Level Sensor
Fuel Gauge
Tachometer
Transfer Fuel Pump (FP)
Speedometer
Engine Speed (RPM) Sensor
Knock Sensor (KS) 1
Knock Sensor (KS) 2
Throttle Position (TP) Sensor
Accelerator Pedal Position Sensor 2

G186 Throttle Drive (for Electronic Power Control
(EPC))
G187 Throttle Drive Angle Sensor 1 (for Electronic
Power Control (EPC))
G188 Throttle Drive Angle Sensor 2 (for Electronic
Power Control (EPC))
G266 Oil Level Thermal Sensor
J285
J338
J538
J623
N276

Instrument Cluster Control Module
Throttle Valve Control Module
Fuel Pump (FP) Control Module
Engine Control Module (ECM)
Fuel Pressure Regulator Valve

Operating Diagrams

J519

G108

G131

Z28 Z30

N205

N80

N316

N318

J293 V177

J623

G410
N32

N33

N83

G163

G83

G40

G247

N84
S360_167

G40 Camshaft Position (CMP) Sensor
G83 Engine Coolant Temperature (ECT) Sensor
(on Radiator)
G108 Heated Oxygen Sensor (HO2S) 2
G131 Oxygen Sensor (O2S) 2 Behind Three Way
Catalytic Converter (TWC)
G163 Camshaft Position (CMP) Sensor 2
G247 Fuel Pressure Sensor
G410 Low Fuel Pressure Sensor
J293 Coolant Fan Control (FC) Control Module
J519 Vehicle Electrical System Control Module
J623 Engine Control Module (ECM)

N32 Cylinder 3 Fuel Injector
N33 Cylinder 4 Fuel Injector
N80 Evaporative Emission (EVAP) Canister Purge
Regulator Valve
N83 Cylinder 5 Fuel Injector
N84 Cylinder 6 Fuel Injector
N205 Camshaft Adjustment Valve 1
N316 Intake Manifold Runner Control (IMRC) Valve
N318 Camshaft Adjustment Valve 1 (exhaust)
V7
Coolant Fan
V177 Coolant Fan 2

Operating Diagrams

J519
J533
K30
K15

Input signal
Output signal
Plus
Ground

CAN

CAN Databus
G42

G70
OUT

J623

G62

J527

G62 Engine Coolant Temperature (ECT) Sensor
G42 Intake Air Temperature (IAT) Sensor
G70 Mass Air Flow (MAF) Sensor
J519 Vehicle Electrical System Control Module
J527 Steering Column Electronic Systems Control
Module
J533 Data Bus On Board Diagnostic Interface
J623 Engine Control Module (ECM)

S360_168

Z28
Z30

Oxygen Sensor (O2S) 2 Heater
Oxygen Sensor (O2S) 2 (behind Three Way
Catalytic Converter (TWC)) Heater

The operating diagram shows the
3.6-liter FSI engine in the Passat as
an example.

Notes

Service

Special Tools
Description

Tool

Use

Funnel T 10333

The Funnel T 10333 is used for installing the
pistons on the 3.6 V6 FSI engine.

Funnel T 10343

The Funnel T 10343 is used for installing the
pistons on the 3.2 V6 FSI Engine.

Puller T10055

The Puller T10055 with Adapter T 10055/3
is used to remove the oil pump.

Adapter T
10055/3

Tool Set T 10133
Puller T 10133/10

Adjusting tool
T 10332

The Tool Set T 10133 with Puller
T 10133/10 is needed to remove the fuel
injectors.

The Adjusting Tool T 10332 must be used
to lock the pinion on the high-pressure fuel
pump drive.

Notes

An on-line Knowledge Assessment (exam) is available for this
Self-Study Program

You can find this Knowledge Assessment on your
Certification Resource Center
at:
www.vwwebsource.com

From the vwwebsource.com homepage, do the following:
1. Click on the Certification tab
2. Click on “My Certification” tab
3. Click the Fulfill link next to this SSP
4. Click “Launch Assessment”

For assistance, please call:
Volkswagen Academy Concierge
1 – 877 – 791 – 4838
(8:00 a.m. to 8:00 p.m. EST)
Or, E-Mail:
concierge@volkswagenacademy.com

Volkswagen of America, Inc.
3800 Hamlin Road
Auburn Hill, MI 48326
Printed in the U.S.A.
October 2006

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VELOCITY VR 6000 VWUSA.COM SSP 823603 3.2L 3.6L VR6 FSI Engine

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