Self-Study Programme 250 Engine management W12 Phaeton.pdf

(1963 KB) Pobierz
Service.
Self-Study Programme 250
Engine Management for the Phaeton W12
Engine
Design and Function
The Motronic engine management system for the
W12 engine allows high engine performance
with low fuel consumption by adapting to all
operating conditions. At the heart of the
Motronic ME7.1.1 are two electronic control units.
In contrast with the W8 engine, what is known as
a two-control unit concept is used in the W12
engine. This concept regards the two cylinder
banks as two separate engines. Essentially, each
control unit is assigned to just one bank.
Control unit 2 obtains information that has been
entered only into Control unit 1 via the internal
CAN databus. This internal CAN databus serves
exclusively to exchange information between the
engine control units.
This Self-Study Programme will familiarise you
with the ME7.1.1 engine management system,
the interaction between the two control units, the
sensors, the actuators and individual
subsystems.
S250_096
This SSP 250 is based on the information in SSP 248 "The W Engine Concept“.
NEW
Important
Note
The Self-Study Programme presents the design
and function of new developments.
The contents are not updated.
Please always refer to the relevant Service Literature
for all current inspection, adjustment and repair
instructions.
2
Table of contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
System overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Subsystems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Function diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
Test your knowledge . . . . . . . . . . . . . . . . . . . . . . . . . 62
3
Introduction
The Motronic ME7.1.1
S250_225
The Motronic ME7.1.1 controls the W12 engine by
means of two engine control units.
The engine management system carries out the
following tasks:
- creates the optimum mixture for all
operating conditions
- reduces fuel consumption
- controls combustion
- checks and controls emission values
Both engine control units are located in the
plenum chamber on the right under the coolant
expansion tank.
4
250_033
Engine control unit 1 J623
Engine control unit 2 J624
250_009
250_008
Terminal 15
Terminal 31
As both control units are completely identical
and the engine control is fundamentally bank-
specific, each control unit must be assigned to
one of the cylinder banks. A Pin code is used to
identify engine control unit 1 J623 for cylinder
bank I, and engine control unit 2 J624 for
cylinder bank II.
Pin 49 for engine control unit 1 is linked to
Terminal 15 and Pin 49 for engine control unit 2 is
linked with Terminal 31. The wiring harnesses are
colour-marked to distinguish them.
Engine control unit 1 is also referred to as the "Master“ and engine control unit 2 as the
"Slave“.
5

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin