88B - 2
MULTIPLEXING
Fault finding - Introduction
88B
V4 MR-372-J84-88B050$100_eng.mif
188BMULTIPLEXING
Fault finding - Introduction
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.
Two of the computers have an internal resistance of 120 Ω (terminating resistance):
–the airbag computer,
–the injection computer:
The network carries data exchanged by the computers.
The Scénic II ph2 is a new generation multiplex vehicle; the main change is the increase in communication speed
to 500 kBauds.
On the Scénic II ph2, fault finding can only be performed on one multiplex network with the RENAULT tool.
The maximum number of computers on this network is 15.
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 sometimes housed in various
computers (distributed functions).
●The test also checks the condition of multiplex network segments.
●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. IMPORTANT
Fault finding can only be carried out on Scénic II ph2 using the CLIP diagnostic tool equipped with the new
vehicle connection probe cord (Part no.: Elé 1674 or 00 00 167 400).
Note:
A second multiplex network for the navigation system may also be present.
MR-372-J84-88B050$100_eng.mif
