transmission RENAULT SCENIC 2003 J84 / 2.G General Information

FAULT FINDING INTRODUCTION
General method
01E
01E-2
101EFAULT FINDING INTRODUCTION
General method
The Scénic II is a multiplexed vehicle equipped with a communications network operating at a speed of
500 kBauds.
This change has allowed a new optimisation of the electronic layout of the vehicle in two ways:
●Distribution of vehicle functions: the main computers present on the multiplex network manage several
functions (example: UCH: access - vehicle protection - lighting - wipers - passenger compartment heating - tyre
pressure monitor).
●Elimination of redundant sensors: the "steering wheel angle" signal used by the electronic stability program
is produced by the electric power assisted steering which then transmits it to the multiplex network. So the
steering wheel angle sensor used by the electronic stability program does not exist.
This change has also allowed fault finding on computers present on the multiplex network to be performed by the
main communication network of the vehicle (multiplex network) instead of a cable network dedicated to fault
finding (K / L lines).Warning:

Scénic II diagnostics can only be done with the CLIP fault-finding tool equipped with the vehicle diagnostic
probe (part no.: Elé. 1674).
Note:
The multiplex network of the vehicle is the main functional communication network of the vehicle. But
certain optional functions are still performed by track wires.
IMPORTANT
However, the Scénic II still uses two different physical fault finding media:
●The multiplex network: which allows fault finding of the following computers: instrument panel, electric
power assisted steering, airbag, automatic air conditioning, UCH, anti-lock braking system - electronic
stability program, protection and switching unit, injection.
●K / L lines diagnostic network: for fault finding on the following computers: automatic transmission,
automatic parking brake, discharge bulbs and parking assistance.
Some other computers, while connected to the vehicle's multiplex network, have their own "self-test" function:
central communications unit (Carminat), driving school unit or that cannot be diagnosed with the tool: steering
lock (governed by the UCH).
IMPORTANT
Computer supply for the fault finding procedure:
To run fault finding on the vehicle computers, proceed as follows:
●Vehicle card in card reader
●Press and hold start button (longer than 5 seconds) with start-up conditions not fulfilled,
●Connect the diagnostic tool and perform the required operations.

FAULT FINDING INTRODUCTION
General method
01E
01E-3
Innovations to the Scénic II:
The innovations in Scénic II fall into three categories:
1 - Functional innovations:
The main functional innovations on the vehicle are as follows:
FUNCTIONAL
INNOVATIONS This section describes the new services present on the vehicle and their integration on
the vehicle.
ARCHITECTURAL
INNOVATIONS This section describes the distribution of the main functions and the new computers
fitted to the vehicle.
FAULT FINDING
INNOVATIONS This section describes the fault finding changes implemented on the Scénic II in order
to:
●Allow fault finding on the multiplex network of the vehicle (vehicle to diagnostic tool
connection sensor).
●Develop and complement multiplex network fault finding functions (physical
measurements of the type of fault, fault finding assistance etc.).
●Mask the diversity and complexity of vehicle functions: fault finding by function, multi-
computers, etc.
KEYLESS VEHICLE
(access, protection -
de-protection and
hands-free starting)This function is provided by the following computers:
●UCH: responsible for access and vehicle protection (immobiliser).
●Steering lock: participates in vehicle protection (electromechanical locking of the
steering column).
●Injection: responsible for vehicle protection (immobiliser) and control of the starter
motor.
●Protection and Switching Unit: responsible for the power supplied to the starter motor
at the request of the UCH, and for injection management.
ELECTRONIC
STABILITY
PROGRAMThis function is provided by the following computers:
●Anti-lock braking system - electronic stability program: responsible for the trajectory
analysis function by means of the speed sensors, the yaw sensor, the transverse
acceleration sensor and the steering wheel angle (driver's intention: signal sent by
the electric power assisted steering).
●Injection: management of engine torque in order to correct the trajectory at the
request of the electronic stability program or automatic transmission.
●Automatic transmission: translation (shared with the injection computer) of driver's
intention, sends torque requests to the injection computer.