88B-2
V1
MR-453-X79-88B000$010.mif
88B
INTRODUCTION
Description of the multiplex network:
The multiplex network consists of a twisted pair of wires connected to several vehicle computers.
These two wires are called multiplex line H and multiplex line L.
On this vehicle, there is only one multiplex network. Depending on the vehicle options, it can include the following
computers: ABS, ESP, torque distributor – ETC, injection, and DP0.
Data is exchanged by the computers on the multiplex network at a communication speed of 500 kbit/s.
In contrast to standard multiplex networks that have two 120 Ω resistors at the two network terminations, this
network has just one 60 ΩΩ
ΩΩ
resistor. This 60 Ω line resistor is located in the injection computer.
PURPOSE
– The purpose of the multiplex network test is to determine the various computers present on the vehicle's multiplex
network as well as the cause of possible inter-computer communication faults.
– It also serves to determine the functions installed in the vehicle which are often housed in various computers
(distributed functions, e.g.: Air conditioning, Security access, etc.).
– The multiplex network test can also run fault finding on computers disconnected from the multiplex network;
this provides an overview of the vehicle's electronic layout.
MULTIPLEXING
Fault finding – Introduction
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