Audi S4 Engine English 1-21225A170044.pdf
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Service.

For internal use only

198

All rights reserved. Subject to change.

AUDI AG

Dept.I

D-85045 Ingolstadt

Fax +49.841

740.2810.17.20

Technical status: 01

Printed in Germany

The 2.7-litre V6 Biturbo

Design and Function

Self-study Programme 198

S4_1GB.pdf

	The variable valve timing

	Cylinder head

	Cooling circuit

	The 2.7-litre V6 biturbo .......

	Page

	Engine Technical data, crankshaft, cylinder head, camshaft timing, cooling circuit, engine lubric...

	4

	Motronic ME 7.1 Subfunctions, system overview

	31

	Subsystems of the Motronic Torque-oriented engine management, torque- oriented functional structu...

	33

	Sensors Additional sensors of the Motronic

	49

	Auxiliary signals

	57

	Functional diagram

	62

	Self-diagnosis Vehicle diagnosis, test and information system VAS 5051, test box V.A.G 1598

	64

	Transmission Self-adjusting clutch, gearbox

	66

	The technical data

	The crankshaft

	Function of fan circuit (for vehicles with air-conditioning system)

	The 2.7-litre V6 biturbo

	Electrical coolant circulation pump V51

	........ a further milestone in engine development by Audi!

	Fan control

S4_2GB.pdf

	Engine lubrication

	The oil circuit

S4_3GB.pdf

	Front view of engine

	View of engine from left

	The �integrated oil supply� ...

	The component parts of the oil circuit

	Air ducting

	Charging

	Divert air control in overrun

	Rear view of engine

	Top view of engine

	Pneumatically controlled systems

	Exhaust system

S4_5GB.pdf

	Torque-oriented engine management

	Electrically actuated throttle valve (electronic accelerator)

	Functional positions of throttle valve control part (linear representation)

	CPU

	Torque reduction

	Exhaust gas temperature control

	Torque increase

	Hot-film air mass meter G70

	Basic adjustment (adaption) ...

	Accelerator position senders G79 and G185

	throttle valve control part J338 with throttle valve drive G186, angle senders 1 G187 and 2 G188 ...

	Self-diagnosis

	Self-diagnosis

	The altitude sender F96 ....

	Torque-oriented

	functional structure

S4_7GB.pdf

	Vehicle diagnosis, test and information system VAS 5051

	Test box V.A.G 1598

	Self-adjusting clutch

	Function of SAC clutch

	Gearbox

	Dear reader,



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