Self-Study Programme 249 Engine management W8 Passat.pdf

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Service.
Self-Study Programme 249
Engine Management of
the W8 Engine in the Passat
Motronic ME 7.1.1
The Motronic engine management system of the
W8 engine enables high power output with mini-
mal fuel consumption through adaptation to all
operating modes. The heart of the Motronic
system is the electronic control unit (J220). It pro-
cesses incoming signals and transmits adjustment
commands for controlling the subsystems. At the
same time, the control unit serves the diagnosis
of subsystems and components.
S249_001
For further information on the W8 engine, please refer to SSP 248 „The W Engine Concept“.
NEW
Important
Note
This self-study programme explains the design
and function of new developments.
The contents are not updated.
Please always refer to the relevant Service literature for current
inspection, adjustment and repair instructions.
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Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
System overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Subsystems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Functional diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Test your knowledge . . . . . . . . . . . . . . . . . . . . . . . . . . 46
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Introduction
The Motronic ME 7.1.1
The regulation of the W8 engine is performed by
the Motronic ME 7.1.1. The management system of
the W8 engine is, in many respects, the same as
that of the VR6-V4 engine. These are the tasks of
the engine management system:
- Optimisation of the fuel-air mixture for all
operating modes
- Reduction of fuel consumption
- Regulation of combustion
- Monitoring and regulation of exhaust
emissions.
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The control unit is located in the electrics box in
the plenum chamber.
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The control unit performs the following functions:
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Regulation of injection
Regulation of ignition (ignition system with single-spark ignition coils)
Regulation of idling speed
Stereo lambda regulation of exhaust emissions
Fuel tank ventilation system
Electronic power control
Cruise control system
Secondary air system
Knock control
Continuously variable inlet valve timing, two-position exhaust valve timing
Control of engine mountings
Regulation of coolant temperature
Regulation of electric vacuum pump
ESP
Self-diagnosis
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The engine control unit in the CAN data bus
The engine control unit communicates with the control units in other vehicle systems.
Data is exchanged through the CAN data bus, which joins the individual control units in a single system.
Drivetrain CAN
ABS
control unit
Steering angle
sensor
Dash panel insert
CAN High
Engine control
unit
CAN Low
Gearbox
control unit
Airbag
control unit
Air conditioning
control unit
Immobiliser
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Through the CAN data bus, data are exchanged between the engine control unit and
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the ABS control unit
the gearbox control unit
the airbag control unit
the steering angle sensor
the air conditioning control unit
the dash panel insert (control unit with display unit in dash panel insert)
the immobiliser.
For further information, please refer to SSP 186 „The CAN Data Bus“.
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