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The Volkswagen 2.0 Liter Chain-Driven TSI Engine


Service Training

Self-Study Program 824803

The Volkswagen 2.0 Liter Chain-Driven TSI Engine

Volkswagen Group of America, Inc. Volkswagen Academy Printed in U.S.A. Printed 5/2008 Course Number 824803 2008 Volkswagen Group 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 Group of America, Inc., its afliated 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 Group 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
Introduction ............................................................................... 1 Engine Mechanicals................................................................... 3 Lubrication System ................................................................. 20 Crankcase Ventilation System ................................................ 25 Cooling System ....................................................................... 27 Air Intake System .................................................................... 30 Fuel System.............................................................................. 36 Exhaust System ....................................................................... 43 Engine Management System ................................................. 44 Service ...................................................................................... 48 Knowledge Assessment .......................................................... 51

Note

Important!

This Self-Study Program covers information on the Volkswagen 2.0 Liter Chain-Driven TSI Engine. This Self-Study Program is not a Repair Manual. This information will not be updated.

For testing, adjustment and repair procedures, always refer to the latest electronic service information.

i

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Introduction
Technical Description
Four Cylinder, Four Valve, TSI Turbocharged Gasoline Engine Engine Block – Cast iron crankcase – Balancer shafts in crankcase – Forged steel crankshaft – Sump-mounted oil pump — chain-driven by crankshaft – Timing gear chain — front end of engine – Balancer — chain-driven at front end of engine Cylinder Head – 4-valve cylinder head – 1 INA intake camshaft adjuster Intake Manifold – Tumble ap Fuel Supply – Demand controlled on low and high-pressure ends – Multi-port high-pressure injector Engine Management – MED 17 engine control module .5 – Hot-lm air mass ow with integral temperature sensor – Throttle valve with contactless sensor – Map-controlled ignition with cylinder-selective, digital knock control – Single-spark ignition coils Turbocharging – Integral exhaust turbocharger – Charge-air cooler – Boost pressure control with overpressure – Electrical wastegate valve Exhaust – Single-chamber exhaust system with closecoupled pre-catalyst Combustion Process – Fuel straight injection

1

Introduction
2.0L Chain-Driven TSI Engine
201 (150) 265 (360) 243 (330) 220 (300) 200 (270) 177 (240) 121 (90) 155 (210) 133 (180) 110 (150) 88 (120) 67 (90) 40 (30) 44 (60) 22 (30) 0 0 1000 2000 3000 4000 5000 6000 7000 0 80 (60) 161 (120)

Engine speed in RPM

Specications Engine Code Type of Engine Displacement Maximum Power Maximum Torque Number of Valves Per Cylinder Bore Stroke Compression Ratio Firing Order Engine Weight Engine Management Fuel Grade Exhaust Emission Standard CCTA - CBFA Inline 4-Cylinder TSI Engine 121 cu in (1984 cm3) 200 hp (147 kW) at 5100 - 6000 rpm 206 lb ft (280 Nm) at 1700 - 5000 rpm 4 3.2 in (82.5 mm) 3.7 in (92.8 mm) 9.6 : 1 1-3-4-2 317 lb (144 kg) Bosch MED 17.5 95/91 RON ULEV (CCTA) - SULEV (CBFA)

2

Engine Mechanicals
Cylinder Block
The cylinder block has a closed-deck conguration and is made of cast iron. It houses the ve-bearing crankshaft assembly and the two balancer shafts. The housing for mounting the chain drives is integrated in the block. The cylinder liners are nished in a three-stage uid jet honing process. The undersides of the pistons are cooled by engine oil supplied by spray jets mounted on the cylinder block. The cylinder block is sealed on the transmission side by a sealing ange and gasket.

3

Engine Mechanicals
Oil Pan
The oil pan consists of two sections. The upper section is made of an aluminum alloy (AlSi12Cu) and reinforces the crankcase through a bedplate effect. It also houses the oil pump. The upper section is bolted to the crankcase and sealed with a liquid sealant. The bottom section is made of sheet steel (deep drawn, punched, and catalytically coated). It houses Oil Level Sensor G12 and the drain plug. The bottom section is bolted to the upper section and sealed with a liquid sealant. The oil pan has an integral honeycomb insert made of polyamide to prevent oil churning when the vehicle is driven aggressively.

Aluminum Alloy Oil Pan Top Section

Polyamide Honeycomb Insert

Stamped Steel Oil Pan Bottom Section

4

Engine Mechanicals
Crankshaft
The ve main bearing crankshaft is made of forged steel and induction hardened. Optimal balancing is achieved by using eight counterweights. To additionally reinforce the crankshaft assembly, three inner main bearing caps are cross-bolted to the cylinder block. Trapezoidal Connecting Rod (Small End) Material: Length: Big-End Bearing: Small-End Bearing: 36MnVS4 5.82 in (148 mm) 1.88 in (47 mm) .8 0.82 in (21 mm)
Piston Wrist Pin

The crankshaft main bearings are a two component type. Axial play of the crankshaft is controlled by thrust washers at the middle support bearing. Bronze bushings are press-t into the small trapezoidal upper end of the connecting rods. The lower end of the connecting rods are cracked to ensure a precision t and reduce movement of the bearing cap under load. The upper and lower bearing shells of the connecting rod are not identical in composition. The upper bearing shell is a two-component composite bearing while the lower shell is a three-component composite bearing.

Wrist Pin Retaining Clip Bronze Connecting Rod Bushing

Trapezoidal Shaped Small End of Connecting Rod

Connecting Rod Upper Bearing Shell

Main Bearing Cap

Connecting Rod Cap

Cross-Bolted Main Bearing Caps and Bolts

5

Engine Mechanicals
Gears are coded for assembly — they can only be installed one way

Vibration Damper

Chain Sprocket

Center Bolt Spur Gear Drive

The chain drive sprocket is mounted to the crankshaft face and driven by a spur gear forged in the crankshaft. The other end of the chain sprocket also has a spur gear surface which drives the vibration damper. This method of joining allows high torque to be transmitted to the chain sprocket and vibration damper while keeping the diameter of the components small. This allows better sealing by the radial shaft seal at the vibration damper hub. Special tools are required during disassembly/assembly of these components to prevent damage to the gears.

On the transmission side of the engine, a dual mass ywheel or torque converter (depending on transmission) is mounted to the crankshaft with eight bolts.

6

Engine Mechanicals
Pistons
The pistons are specially designed for the TSI engine with a cast-in ring land for the upper piston ring. Coated skirts are used to help reduce frictional losses. The upper piston ring is rectangular, the second piston ring is a taper-faced ring, and the oil scraper ring is a beveled ring with expander. The 31CrMoV wrist pins are held in place by snap rings. The bottom side of the pistons are cooled by engine oil from spray jets mounted on the cylinder block.

7

Engine Mechanicals
Cylinder Head
L M K

N

J

O P I H

G Q R E D C F

S

T

B A

8

Engine Mechanicals
The 4-valve cylinder head is cast from aluminum alloy. Intake and exhaust valves are actuated by roller cam followers supported by hydraulic valve lifters. The intake and exhaust camshafts are chain-driven. The variable timing of the intake camshaft is accomplished through the INA camshaft adjustment system (page 11). The cylinder head cover adds support by acting as a ladder frame and does not have to be disassembled to remove the cylinder head. The diagonal opening and sealing face simplies drive chain installation.

Features – Crossow cylinder head made of ASi10Mg – Three-layer metal head gasket. – Intake ports divided by bafe plate – Cylinder head cover made of AlSi9Cu3 with integrated ladder frame, bolted to cylinder head and sealed with liquid sealant – Intake valve: solid-stem valve, chrome-plated with reinforced seat – Exhaust valve: sodium lled hollow-stem valve, chrome-plated and tempered with reinforced seat – Single valve spring made of steel – Roller cam followers running in needle bearings, hydraulic valve clearance adjustment – Hydro-formed, assembled intake camshaft with variable valve timing, dwell angle 190°, valve lift 10.7 mm – Hydro-formed, assembled exhaust camshaft with press-t drive gear, dwell angle 180°, valve lift 8 mm – INA Camshaft Adjuster, timing range 60° crank angle, basic position is locked in “retard” (engine not running)

Legend A B C D E F G H I J Check valve Sealing end cap Exhaust valve Intake valve Valve stem seal Valve spring Valve spring retainer Valve keeper Exhaust camshaft Intake camshaft with INA adjuster K L M N O P Q R S T Cylinder head cover Cylinder head cover screw Screw plug Sealing end cap Hydraulic valve clearance adjuster Roller cam follower Dowel pin Cylinder head bolt with washer Exhaust manifold locating pin Exhaust manifold stud

9

Engine Mechanicals
Bearing Bridge
A die-cast aluminum bearing bridge mounted at the front of the cylinder head has the following tasks: – Supporting the camshafts – Supplying pressurized oil to camshaft bearings – Supplying pressurized oil to the camshaft adjuster – Controlling axial movement of camshafts – Mounting point for Camshaft Adjustment Valve 1 N205 The bearing bridge also serves to connect the two oil galleries of the cylinder head. A check valve and lter screen are integrated in the pressurized oil duct to the INA camshaft adjuster.

Die-Cast Aluminum Bearing Bridge

10

Engine Mechanicals
INA Camshaft Adjustment System
The 2.0L TSI engine uses a hydraulic vane cell adjuster on the intake camshaft to affect valve timing. Only the intake camshaft has variably adjusted timing on this engine. Oil pressure for this task is provided by the engine oil pump. The variable camshaft adjuster provides an adjustment range of 60° crank angle. The camshaft is locked in the retard position at engine shut-off. This function is performed by a spring-loaded locking pin. The camshaft is released when the engine oil pressure exceeds 7 psi (0.5 bar). .25 The rotor of the vane cell adjuster is welded to the intake camshaft. The 4/3-way central valve required for adjuster control is integrated in the camshaft. Intake camshaft timing is map-controlled by the engine control module. The goals are to improve engine power, enhance running smoothness, and reduce emissions (through internal exhaust gas recirculation). Function Pressurized oil ows to the central valve via the camshaft bearing through bores in the camshaft. From here, depending on adjustment requirements, the oil ows through additional bores in the camshaft to one of the chambers in the adjuster.

Stator Cover 4/3-Way Central Valve Low-Friction Bearing Vane with Spring

Camshaft Adjustment Valve 1 N205 Locking Pin Armature Locking Spring Shaft with Ball Rotor

Winding

Coil Element

Camshaft with Bores for Hydraulic Control

11

Engine Mechanicals
Valve Timing

J623 G70

N205

G28

J271

G40

G17

Legend G17 G40 G28 G70 Engine Coolant Temperature Sensor Camshaft Position Sensor Engine Speed Sensor Mass Air Flow Sensor J271 J623 N205 Motronic ECM Power Supply Relay Motronic Engine Control Module Camshaft Adjustment Valve 1

The valve is activated electrically via Camshaft Adjustment Valve 1 N205. When activated by a PWM signal, the solenoid produces a variable magnetic eld. Depending on the strength of the magnetic eld, the shaft with ball is shifted towards the camshaft axis of rotation. This, in turn, displaces the 4/3-way central valve and allows the oil to ow to the corresponding chamber.

The new design has many advantages. It provides a very high adjustment rate capability even in unfavorable conditions such as cold starts or high oil temperatures during engine idling.

12

Engine Mechanicals
Chain Drive
All three chains of the 2.0L engine are driven directly by the chain sprocket mounted to the crankshaft. The chains are arranged in three planes (levels). – 1st Plane - Balance Shaft Drive – 2nd Plane - Camshaft Drive – 3rd Plane - Oil Pump Drive Gear chains (as opposed to roller chains) are used in all three planes. They are 1/4 inch gear chains whose tension is controlled by four tension plates and ve guide plates. Gear chains are more wear resistant and produce less noise than roller chains. The amount of space required for a given power transmission capacity is less than that of a timing belt or roller chain. Gear chains are highly exible in application because their width can be adapted for any power requirement by selecting the number of plates accordingly. They have an efciency of approximately 99%.

Intake Camshaft with INA Adjuster

Oil Pump Drive

Balance Shaft Drive Gear

13

Engine Mechanicals
1st Plane — Balance Shaft Drive Two cylinder block housed balance shafts are used to counteract unwanted vibration at engine speeds above 4000 rpm from being transmitted to the car body. The balance shafts run at twice the engine speed in opposite direction from one another. The direction of the second shaft is reversed by an idler gear. The horizontally staggered arrangement of the balance shafts also helps reduce vibration. The balance shafts are made from spheroidal graphite cast iron and run in three bearings. Chain lubrication is provided by oil returning from the cylinder head. Oil is collected and distributed to the chain by a separate lubrication channel. Mounting the balance shafts in the cylinder block has the following advantages: – The cylinder block provides higher rigidity – Oil foaming is eliminated by moving the rotating parts away from the oil sump

Balance Shafts

Hydraulic Chain Tensioner

Guide Rail

Tensioning Rail

Idler Gear

Slide Rail Chain Sprocket

14

Engine Mechanicals
Balance Shaft Layout The oil return channel from the cylinder head is located on the exhaust side of the cylinder block. Return oil ows through the balance shaft housing. The balance shaft is mounted in a plastic pipe. This prevents oil returning from the cylinder head from churning and foaming from direct contact with the balance shaft.
Oil Return Channel from Cylinder Head

Plastic Pipe

Oil Return Line

Idler Gear

Helical Balance Shaft Drive Gear

15

Engine Mechanicals
2nd Plane — Camshaft Drive The camshafts are driven by a chain positioned on the second level. Tensioning is accomplished by a hydraulic tensioner. The tensioner can be accessed through a service opening. This allows the timing chain to be detached after removing the cylinder head without having to remove the engine timing cover.

Chain Tensioner with Rig Pin

Slide Rail, Timing Gear Chain Sprocket, INA Intake Camshaft Adjuster Chain Sprocket, Exhaust Camshaft

Collar Bolt, Tensioning Rails Guide Rail, Timing Gear Tensioning Rail, Timing Gear Balance Shaft Gear, Exhaust Side of Engine Hydraulic Tensioner, Camshaft Chain Drive Tensioning Rail Balance Shaft Chain Tensioner Collar Bolt, Tensioning Rail Chain Sprocket Tensioning Rail, Oil Pump Chain, Oil Pump Balance Shaft Gear, Intake Side of Engine

Slide Rail

Chain Sprocket, Oil Pump

16

Engine Mechanicals
3rd Plane — Oil Pump Drive The chain drive for the oil pump is located in the third plane. A polyamide slide rail is used in this drive to locate and tension the chain. The tension is produced by a mechanical spring. A hydraulically damped system is not needed due to the low dynamic load. The chain is lubricated by return oil or by the oil in the oil pan.

Drive Sprocket Attached to Crankshaft for Oil Pump

Slide Rail

Oil Filter Screen

Oil Pump Pressure Regulating Valve

Tensioning Spring

17

Engine Mechanicals
Each drive chain has a special dark link. The dark links are only on one side of the drive chain facing out from the engine block. For the adjustment of the camshaft drive, the markings on the chain sprockets must align with the dark links of the chain. However, to bring the camshaft drive gears into alignment with TDC by rotating the crankshaft requires approximately 166 revolutions of the crankshaft. Therefore, during repairs when the drive chains must be removed, it is acceptable that the technician use the dark links as a guide and make his own markings on the sprockets. Please refer to the appropriate repair information for complete details.

18

Engine Mechanicals
Alternator/AC Compressor Drive
A subframe supports both the alternator and air conditioning compressor. They are driven by a poly-vee belt which is tensioned by a spring-loaded tensioner.

Subframe Alternator

Spring-Loaded Belt Tensioner

Air Conditioner Compressor

19

Lubrication System
Lubrication System Schematic
Legend 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Screen Oil pump, chain-driven Cold start valve Pressure regulating valve Check valve, integrated into oil pump Water-oil heat exchanger Check valve, integrated into oil pump Oil cleaner Oil drain valve Oil Pressure Switch F1 Spray jets with integrated valves Oil screen Chain tensioner Chain tensioner Gear lubrication Coarse oil mist separator Non-return valve, integrated into cylinder head Oil screen Flow restrictor Lubrication of high-pressure fuel pump cam Fine oil mist separator Oil screen Check valve, integrated into bearing bridge Multi-directional regulating valve for camshaft adjuster Camshaft Adjustment Valve 1 N205 Oil Level Thermal Sensor G266 Vacuum pump Turbocharger
6 9 Subframe 16 Oil Separator 7 8 10

A

24

23 25 A 22 17

Bearing Bridge

5 2 26 3 1

15

4 Oil Pan

20

Lubrication System

21

A

A

A

A

A

27

18 19 B B B B B B B B Vacuum Pump

B B

B B

B B

B B

A

A

A

A Cylinder Head

A Camshaft bearing B Support element C Balance shaft bearing D Connecting rod E Main bearing

Low-Pressure Circuit 13 14 28 High-Pressure Circuit

C 12

D

C 12

D

D

C

D

E

E

E

E

E

11 12 C C

11 12

11

11

C Cylinder Crankcase

21

Lubrication System
Oil Pump
The external gear oil pump is housed in the oil pan top section and is chain-driven by the crankshaft. The oil pressure is controlled inside the pump by a control spring and piston. The system is also protected against overpressure by a spring loaded valve ball (cold start valve).
Cover

Excessively high oil pressures can occur at high oil viscosity levels during cold starting.

Drive Shaft Bushing

Housing

Chain Sprocket

Steel Ball Compression Spring End Cap Piston External Oil Pump Gears

Compression Spring Stop

22

Lubrication System
Oil Filter and Cooler
The oil lter and oil cooler bracket are integrated in a subframe. It also houses the oil pressure switch and the tensioner for the belt drive. The oil lter cartridge is accessible from above for easy servicing. To prevent oil spillage when changing the lter, a breech pin opens as the lter is removed. This allows the oil to ow back into the oil pan.

Oil Filter

Oil Cooler

Oil Filter Module Bracket

23

Lubrication System

Oil Filter Cartridge

Non-Return Valve

Oil Feed from Oil Cooler

Oil Cooler

Oil Flow to Engine Breech Pin Oil Seals Return Line to Oil Pan Closed in this Position

Non-Return Valve Closed Sleeve Integrated into Oil Filter

Breech Pin Resetting Range Allowing Direct Return To Oil Pan

Direct Return to Oil Pan

24

Crankcase Ventilation System
System Overview
A primary oil separator is installed on the cylinder block just below the engine coolant pump. A bafe plate in the oil pan upper section prevents engine oil from being drawn out of the sump at the gas extraction point. In the primary oil separator, the blow-by gases ow through a labyrinth to separate coarse particles from the oil. The primary oil separator has two separation stages which work on the bafe-plate principle. The separated oil ows back along oil return lines into the oil pan. The blow-by gases continue to ow from the primary oil separator through a channel in the cylinder block to the cylinder head. The large cross-section channels results in a low crankcase breather gas ow rate which prevents oil droplets from travelling along the sides. A ne oil separator is integrated with the cylinder head cover. A single-stage cyclone separator with a parallel bypass valve lters out any residual ultra-ne oil particles. The separated oil ows into the cylinder head through a port in the cylinder head cover; from there, the oil is returned to the oil pan. To prevent intake of the engine oil under excessively high vacuum, a check valve is installed at the end of the oil return duct. This check valve is installed in the honeycomb insert in the oil pan. The blow-by gases ow along a duct integrated in the cylinder head cover to a two-stage pressure regulating valve. The pressure regulating valve prevents excessively high vacuum from developing within the cylinder block. The pressure regulating valve is installed in a housing together with two check valves. The check valves regulate blow-by gas ow depending on pressure conditions in the intake manifold. If a vacuum is present in the intake manifold (for example, at low engine speed) when the exhaust gas turbocharger is not producing boost pressure, the blow-by gases are drawn directly into the intake manifold. If boost pressure is present, the blow-by gas is inducted on the intake side of the turbocharger.

Fine Oil Separator

Primary Oil Separator

25

Crankcase Ventilation System
Positive Crankcase Ventilation
This system supplies the crankcase with fresh air to mix with blow-by gases. Fuel and water vapors in the blow-by gases are absorbed by the fresh air and then discharged through the crankcase ventilation system. Fresh air is drawn in from the intake air system downstream of the air lter and Mass Air Flow Sensor. A breather pipe is connected to the cylinder head cover via a check valve (PCV valve). The PCV valve ensures a continuous air supply and that unltered blow-by gases cannot be aspirated directly. The PCV valve is also designed to open under high pressure inside the crankcase. This precaution prevents damage to seals due to over-pressure.

PCV Valve

Cutaway View of Crankcase Breather Valve A Cover Compression Spring Direction of Flow Housing O Ring Silicone Valve Disc, Perforated O Ring

Sealing Disc Retainer B

Direction of Flow A-B Opening Pressure Pressure Greater Than - 0.10 psi (-7 hPa)

Direction of Flow B-A 1.4 ± 0.21 psi (100 ± 15 hPa)

26

Cooling System
Engine Cooling System
The engine uses a cross-ow cooling system. Engine coolant rst ows to the front of the engine from the coolant pump. The coolant is then distributed along ducts and circulates around the cylinders. After circulating through the cylinder head, the coolant is routed back to the radiator via the thermostat housing or recirculated through the coolant pump if the thermostat is closed. The heat exchanger and turbocharger are part of the engine cooling circuit. The engine oil cooler is connected directly to the cylinder block through its mounting subframe. After-Run Coolant Pump V51 protects the turbocharger bearings from overheating after engine shut-off. The pump is activated by the engine control module based on programmed characteristic maps.
Heat Exchanger

Coolant Expansion Tank

Turbocharger Coolant Outlet from Cylinder Head to Heat Exchanger

Coolant Pipe Engine Oil Cooler

Thermostat/Coolant Pump Module

After-Run Coolant Pump V51

Radiator

Note

Vehicle coolant systems are dependent on model equipment installed. For vehicle specic information, please consult the relevant Repair Manual.

27

Cooling System

Cylinder Head

Cylinder Block

Engine Coil Cooler

Coolant Pump Drive Thermostat Housing with Coolant Pump

Outlet Inlet Long and Short Cooling Circuits Controlled by Coolant Thermostat

28

Cooling System
Coolant Pump
The coolant pump, temperature sensor, and coolant thermostat are integrated in a common housing made of duroplastic. This housing is attached to the cylinder block below the intake manifold. A drive gear at the end of the balance shaft drives the coolant pump via a toothed belt. The larger drive gear on the pump acts as a speed reducer. A fan wheel is attached to the coolant pump drive gear to cool the toothed belt. The coolant pump impeller is made of plastic and has a special vane contour which permits high engine speeds with low risk of pump cavitation. The thermostat begins to open at 203°F (95°C) and is fully open at 221°F (105°C).

Note

The tension of the coolant pump drive belt is dened by the installation position of the coolant pump and cannot be adjusted. In the event of coolant pump failure, the housing must also be replaced. The toothed belt drive gear of the coolant pump has a left-hand thread.

Engine Coolant Temperature (ECT) Sensor G62

Coolant Pump Impeller Fan Wheel

Heating Return Line

Coolant Thermostat

Balance Shaft Outlet

Toothed Belt Drive Gear with Left-Hand Thread Bolt Inlet

29

Air Intake System
Intake Manifold Module
Legend 1 2 3 4 5 Throttle valve control module Intake Air Temperature (IAT) Sensor G42 Evaporative (EVAP) Emission Canister Purge Regulator Valve N80 Vacuum motor for intake manifold ap changeover Fuel port, high-pressure pump 6 7 8 9 10 11 Fuel port, high-pressure fuel rail Double check valve for EVAP system High-pressure fuel rail Fuel Pressure Sensor G247 Intake manifold aps Intake Manifold Runner Position Sensor G336

3

4

2

1 5

6 7

8 9

30

Air Intake System

The body of the intake manifold module is made of polyamide and consists of two shells which are plastic-welded together. The intake manifold aps are trough shaped. Through this shape and their arrangement in the intake port, the intake airow is improved when the aps are open. An improvement in tumble capacity is also achieved when closing the aps. The intake manifold aps are adjusted by a vacuum motor. The motor uses a two stage process.

Feedback about the ap position is provided by Intake Manifold Runner Position Sensor G336. When the engine is not running, the intake manifold aps are closed. Blow-by gases and vapor from the charcoal canister vent directly into the airow downstream of the throttle valve assembly.

11 10

31

Air Intake System
Air Supply
Vent Hose Air Intake Intake Tube

Turbocharger

Vacuum Line Positive Crankcase Ventilation (PCV) Line Vacuum Pump

Charcoal Canister Line

Air Filter

Intake Manifold Runner Control (IMRC) Valve N316

Intake Manifold

Pressure Regulating Valve

Vent Hose Oil Separator

Pressure Hose

Charge Air Cooler

32

Air Intake System
Evaporative Emission System
Venting of fuel vapors from the charcoal canister while the engine is running involves using two different paths. When boost pressure from the turbocharger is present, fuel vapors cannot directly ow into the intake manifold. In this case, the vapors are directed to the intake side of the turbocharger. When boost pressure is not present, the vapors are drawn in through the intake manifold downstream of the throttle body. A double check valve in the evaporative system accomplishes this task.

Inow into Intake Manifold (Charge Pressure Present)

Fuel Tank

Exhaust Gas Turbocharger

Charcoal Canister

Intake Manifold

Evaporative (EVAP) Emission Canister Purge Regulator Valve N80

Double Check Valve Inow into Intake Manifold (No Charge Pressure) Charge Air Cooler

33

Air Intake System
Vacuum Supply
The required vacuum for the brake booster and other vacuum driven components of the engine is produced by a mechanically driven vacuum pump. The pump is a swivel vane pump driven by the exhaust camshaft and is installed behind the highpressure fuel pump. The vacuum pump is capable of providing a sufcient vacuum for all vacuum components under any operating condition. For this reason, it is not necessary to use an additional vacuum reservoir. The pump is rated to deliver a continuous absolute pressure of 0.73 psi (50 mbar). Oil for lubricating the pump and to enhance the sealing of the pump vanes is provided through a special port in the cylinder head.

Check Valve with Integrated T-Piece

To Brake Servo Vacuum Pump on the Exhaust Camshaft — Mechanically Driven

Intake Manifold Runner Control (IMRC) Valve N316

Vacuum Motor

34

Air Intake System
Vacuum Pump

The vacuum pump consists of a rotor running in bearings and a moving vane made of plastic which divides the vacuum pump into two sections.

The position of the vane is constantly changing due to the rotational movement of the rotor. As a result, the volume of one section increases while the volume of the other section decreases.

Air Inow from Vacuum System Intake End Vane Induced Air

Vane

Rotor Rotor

Compressed Air Pressure End Air Outow to Cylinder Head (Shuttle Valve) Oilway

35

Fuel System
Fuel System
The fuel system is an advanced version of the system used on earlier TSI engines. All parts which are in direct contact with fuel are designed in such a way that the engine can run on any available fuel grade. Special materials are used to ensure the fuel system meets all requirements relating to corrosion protection. The high-pressure system is supplied with fuel by a returnless, demand controlled pre-supply system. Fuel is delivered at a variable pressure between 50.7 psi (3.5 bar) and 87 psi (6.0 bar). .1 No low pressure sensor is used in this system. The correct fuel pressure is determined by mapped settings of the engine control module and subsequently set by Fuel Pressure Regulator Valve N276.

Fuel Pressure Sensor G247 Rail

High-Pressure Fuel Pump

Fuel Pump (FP) Control Module J538

Fuel Pressure Regulator Valve N276

Fuel Filter PWM Signal From Engine Control Module
Ter. 31 Ter. 30

Fuel Tank

36

Fuel System
Fuel Rail
The fuel delivery rate of the high-pressure pump has been reduced through the use of a four-lobe cam. A quicker pressure build-up is thus possible. This build-up benets both cold start and hot start situations. Fuel Pressure Sensor G247 The fuel pressure sensor is mounted in the fuel rail and is designed for measuring pressures up to 2900 psi (200 bar). Note Always carefully follow the repair manual instructions when replacing the high-pressure fuel pump. The pump can be destroyed if the actuating cam follower is not properly installed.

Fuel Pressure Regulating Valve N276 Fuel HighPressure Pump Four-Lobed Cam

Cam Follower

From Fuel Tank Camshaft Rail

Fuel Pressure Sensor G247

Fuel Injector

37

Fuel System
High-Pressure Pump
The demand controlled high-pressure pump by Bosch is driven by a four lobed cam on the end of the intake camshaft. The pump piston is driven by the camshaft and a cam follower. This reduces friction as well as the chain forces. The results are smoother engine operation and higher fuel economy. The use of the four lobe cam has allowed a reduced piston stroke compared to earlier versions of the 2.0L TSI engine. Due to the shorter stroke, the individual delivery rates are lower. This, in turn, results in reduced pressure uctuations. The metering precision of the injectors is also improved, as there is now one feed stroke per injection. The advantage of this is improved oxygen sensor control and fuel efciency. Note Always follow the repair manual cautions and warnings when opening the high-pressure fuel system lines. Serious injury can result if proper procedures are not observed. The high-pressure pump produces a maximum pressure of 2175.5 psi (150 bar). The fuel pressure requested by the engine control module is adjusted by Fuel Pressure Regulator Valve N276. The pressure is regulated between 725.1 psi (50 bar) and 2175.5 psi (150 bar) depending on engine requirements. The high-pressure pump now has its own pressure limiting valve. This valve opens at approximately 2900 psi (200 bar) and admits pressure into the pump chamber. Previously, pressure was discharged into the low-pressure circuit. Excessively high-pressures can build up in overrun or when the engine heat soaks after shut-off. The pressure pulsations in the low-pressure circuit are reduced by a damping element integrated in the pump.

High-Pressure Regulation Fuel pressure and fuel quantity are regulated by Fuel Pressure Regulator Valve N276. The signal from Fuel Pressure Sensor G247 is used by the engine control module as a parameter. This sensor is located in the fuel rail. Power demand has been reduced signicantly through a newly designed fuel pressure regulating valve and associated control concept. At the start of delivery, Fuel Pressure Regulating Valve N276 is activated only very briey. The intake valve closes, fuel pressure builds up, and fuel delivery immediately begins. After the intake valve closes, electrical power to the solenoid valve is shut off. The intake valve kept closed by the pressure in the pump until the pump piston feed stroke is complete and the intake stroke begins. Note Applying continuous voltage to Fuel Pressure Regulator Valve N276 for longer than one second will cause damage to N276.

38

Fuel System
Low Pressure Damper Inlet Valve Fuel Pressure Regulator Valve N276

Delivery Chamber Outlet

Needle

Flange Armature Piston Coil

O Ring

Seal

Note
Pressure Limiting Valve

These illustrations have been modied slightly from the actual pump for purposes of clarity.

Connection to Rail

Connection to Low Pressure

39

Fuel System
Control Concept
The diagram shows the high-pressure regulation function of the high-pressure pump. The complete delivery cycle for a cam is shown here. This cycle takes place four times during a single revolution of the camshaft. The bottom diagram shows the movement of the pump piston and the activation of Fuel Pressure Regulator N276.
FFlow Force EFP FVacuum

FRV De-Energized

FRV De-Energized

IV Delivery Chamber Delivery Chamber EV

Intake Stroke

IFRV

Fig. 1

– Pump piston intake stroke, fuel ows into pump chamber – N276 de-energizes – Intake Valve (IV) opens because spring force is less than ow force of transfer fuel pump — vacuum is present inside pump – Exhaust Valve (EV) closes

– Pump piston feed stroke, fuel ows back to inlet – N276 de-energizes – IV opens due to upward motion of pump piston, fuel moves from pump chamber into inlet – EV closes

Fig. 2

40

FFlow Force EFP FReverse Flow Force

FIV FSpring

FIV FSpring

Fuel System
The operating point of the N276 changes depending on when it is activated by the engine control module. The ON time remains the same. The earlier N276 is activated, the more actively the delivery stroke can be used and hence the more fuel can be delivered.

FFlow Force EFP FDelivery Pressure

FRV Energized

FRV De-Energized

Delivery Chamber

Delivery Chamber

Legend FRV I F IV EFP EV Fuel Pressure Regulator Valve N276 Current Force Intake valve Electric fuel pump Exhaust valve

Feed Stroke

Current Reduction Time

– Pump piston feed stroke, fuel ows to rail – N276 receives short pulse of electrical current from engine control module – IV closes. Due to upward motion of pump piston, pressure builds up immediately inside pump – EV opens

Fig. 3

– Pump piston feed stroke, fuel ows to rail until intake stroke begins – N276 de-energizes – IV closes – EV opens

Fig. 4

FFlow Force EFP FDelivery Pressure

FIV FSpring

FIV FSpring

41

Fuel System
Injector
Each fuel injector has six individual fuel openings, providing better mixture preparation. This also helps prevent “wetting” the intake valves and the combustion chamber surfaces during injection cycles. The angle of cone of the jet is 50°. These modications have resulted in reduced HC emissions, particulate matter formation, and oil thinning.
Single Port Injector

Multi Port Injector

42

Exhaust System
Turbocharger and Manifold Module
A turbocharger and manifold module is used. It is attached to the cylinder head by clamping anges.

Coolant Flow to Radiator or from Auxiliary Water Pump Charcoal Canister Connection

Pressurized Oil Inlet

Coolant In-ow from Cylinder Block

Turbocharger Recirculating Valve N249

43

Engine Management System
Overview of Bosch MED 17.5 System Sensors
Mass Air Flow (MAF) Sensor G70 Intake Air Temperature (IAT) Sensor G299 Engine Coolant Temperature (ECT) Sensor (on Radiator) G83 Engine Coolant Temperature (ECT) Sensor G62 Change Air Pressure Sensor G31

Engine Speed (RPM) Sensor G28

Camshaft Position (CMP) Sensor G40

Throttle Valve Control Module J338 with Throttle Drive Angle Sensor 1 G187 and Throttle Drive Angle Sensor 2 G188

Engine Control Module (ECM) J623 with Ambient Pressure Sensor

Throttle Position (TP) Sensor G79 Accelerator Pedal Position Sensor 2 G185

Brake Pedal Switch F63 Clutch Position Sensor G476 Data Bus On Board Diagnostic Interface J533

Fuel Pressure Sensor G247

Intake Manifold Runner Position Sensor G336

Instrument Cluster Control Module J285

Knock Sensor (KS) 1 G61 Heated Oxygen Sensor (HO2S) G39 Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 DFM Generator, Cruise Control ON/OFF

Oil Level Thermal Sensor G266

44

Engine Management System
Actuators
Motronic Engine Control Module (ECM) Power Supply Relay J271 Engine Component Power Supply Relay J757 Intake Manifold Runner Control (IMRC) Valve N316

Wastegate Bypass Regulator Valve N75

Fuel Pressure Regulator Valve N276

Fuel Pump (FP) Control Module J538 Transfer Fuel Pump (FP) G6

Cylinder Fuel Injectors 1-4 N30-N34

Ignition Coils with Power Output Stages N70, N127, N291, N292 Throttle Valve Control Module J338 with Throttle Drive for Electronic Power Control (EPC) G186

Diagnostic Link Connector

Evaporative (EVAP) Emission Canister Purge Regulator Valve N80 Oxygen Sensor (O2S) Heater Z19

Coolant Circulation Pump Relay J151 After-Run Coolant Pump V51

Camshaft Adjustment Valve 1 N205 Radiator Fan Setting 1, PWM Signal Leak Detection Pump V144

45

Engine Management System
Engine Control Module
The 2.0L TSI engine uses the Bosch MED 17 .5 engine control module. The hardware and software components have been developed so they can be used for future projects both for gasoline and diesel engine applications. This allows maximum use with regards to functions and vehicle interfaces independent of the engine combustion conguration. Examples of this include the Electronic Pedal Control and radiator fan activation strategies. The new IFX Tricore processor family has sufcient capacity in reserve to accommodate future advancements in order to meet market requirements. Hardware in the engine control module: – Inneon IFX Tricore 1766 (Leda Light) – 80 MHz system frequency – 1.5 MByte internal ash – Single chip system

Oxygen Sensor Control A new feature of the MED 17 is the deletion of the .5 continuous-duty oxygen sensor. Now, a nonlinear oxygen sensor is installed. The sensor is located between the close-coupled pre-catalyst and the underbody catalytic converter. The function of the continuous-duty pre-cat sensor has been mapped by the new functions of the engine control module. These maps are generated by conducting appropriate tests during engine development. Advantages: – Fewer potential sources of fault – More cost-effective – Requirements of ULEV are met without continuous-duty oxygen sensor – No adjustments needed in customer service or for exhaust emission inspections

Operating Modes In all operating ranges of the engine, except directly after starting (when the fuel-air mixture is slightly richer), the mixture composition is set to lambda 1. The following operating modes are implemented: – In Start phase: high-pressure — start of fuel-air mixture – For several seconds after Start: HOSP – Following Warm-Up phase: engine map controlled dual injection cycle – At coolant temperatures of 176°F (80°C) or higher: fuel injection synchronous with intake cycle only The intake manifold aps open at an engine speed of 3000 rpm.

46

Engine Management System
Substitute Functions in Case of Sensor/Actuator Failure

Symptom in Case of Failure F63 G39 G61 G62 G83 No Cruise Control No Control No No Radiator Fan Runs Permanently in Setting 1 No Throttle Response No Throttle Response No High-pressure No No Cruise Control No Power Supply to ECM — Engine Not Running No No High-pressure Engine Not Running Smoothly Engine Not Running Smoothly No No No High-pressure No

DTC Entry Yes Yes Yes Yes No

MIL No Yes No Yes No

EPC No No No No No

Substitute Signal No Yes Yes Yes No

Power Limitation No No Yes No No

Emergency Operation No No No No No

G79/G185 G187/G188 G247 G336 G476

Yes Yes Yes Yes Yes

Yes Yes Yes Yes No

Yes Yes No No No

No No No No No

Yes Yes Yes No No

Yes Yes Yes No No

J271 J538 J757 Ignition Coils N30-N33 N75 N205 N276 N316

No Yes Yes Yes

No Yes Yes Yes

No No Yes Yes

No No No No

No No Yes Yes

No No Yes Yes

Yes Yes Yes Yes Yes

Yes Yes Yes Yes Yes

Yes Yes No Yes No

No No No No No

Yes Yes No Yes No

Yes Yes No Yes No

Note

This table refers to generally occurring faults. It is not a substitute for fault nding with the Workshop Manual and the “Guided Fault Finding” function. The parameters specied in the table are subject to deviation depending on fault type. Specications are subject to change due to updating of engine control module software.

47

Service
Special Tools

Shown Here are the Special Tools for the Chain-Driven 2.0 Liter 4V TSI Engine:

T10352 For Removing the 4/3-Way Central Valve of the Camshaft Adjuster

T10353 Thrust Piece for Installing the Oil Seal on the Water Pump Shaft

T10354 Thrust Piece for Installing the Oil Seal on the Front Crankshaft (Vibration Damper)

48

Service

T10355 Retainer for Removing the Crankshaft Center Bolt

T10359 Engine Holder for Removing the Engine with Transmission

T10360 Torque Wrench Adapter Used for Removing/Installing the Belt Drive Pulley Bolt for the Engine Coolant Pump V.A.G. 1331

49

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Knowledge Assessment
An on-line Knowledge Assessment (exam) is available for this Self-Study Program. The Knowledge Assessment may or may not be required for Certication. You can nd this Knowledge Assessment at:

www.vwwebsource.com

For Assistance, please call:

Volkswagen Academy Certication Program Headquarters 1–877–491–4838 (8:00 a.m. to 8:00 p.m. EST)
Or, E-Mail:

concierge@volkswagenacademy.com

51

824803

Volkswagen Group of America, Inc. 2200 Ferdinand Porsche Dr. Herndon, VA 20171 Printed in the U.S.A. May 2008


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