ESP RENAULT SCENIC 2003 J84 / 2.G General Information

FAULT FINDING INTRODUCTION
ABBREVIATIONS
01E
ABBREVIATIONS MEANING OF ABBREVIATION
ABSAnti-lock braking system
ALPFault Finding Chart
APCAfter ignition
AVCBefore ignition
BVAAutomatic gearbox
BVMManual gearbox
BVRSequential gearbox
CANController Area Network
ACAir conditioning
CDCompact disc
PASPower assisted steering (hydraulic)
EPASElectric power assisted steering
DVDDigital versatile disc
DTCFault finding code
EGRExhaust gas recirculation
ESPElectronic Stability Program
GMVMotor-driven fan assembly
CNGCompressed natural gas
LPG Liquefied petroleum gas
HLEHigh yield strength
MAGMetal active gas (for welding steel)
MIGMetal inert gas (for welding aluminium)
MRWorkshop repair manual
TNTechnical Note
OBDOn board diagnostics
SERResistance welding
SSPPTyre pressure monitoring system
THLEVery high yield strength
TMLabour time
UCHPassenger Compartment Unit
UPCProtection and Switching Unit
UCTRoof control unit
UHLEUltra high yield strength
VINVehicle identification number
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101EFAULT FINDING INTRODUCTION
ABBREVIATIONS

FAULT FINDING INTRODUCTION
General method
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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.

FAULT FINDING INTRODUCTION
General method
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LIGHTING - XENON
BULBThis function is provided by the following computers:
●UCH: translation of driver's intention, management of the lighting stalk, the direction
indicators and the rear fog lights.
●Switching Protection Unit: responsible for the power needed for lighting, the side
lights, the main beam headlights and the front fog lights.
●XENON bulb: responsible for management and correction of the dipped headlights.
IMPORTANT
The "discharge bulb" function in the Scénic II involves the following components:
●Two body-height sensors in the front and rear wheel arches on the left side.
The built-in front height sensor as well as the computer that manages
this feature.
●Two units that adjust / produce high-voltage lighting installed in the vehicle's
headlight units.
MULTIMEDIAThis function is provided by the following computers:
●Central Communication Unit (Carminat): responsible for the function.
●Navigation display: displays information relating to navigation.
IMPORTANT
This function may also be provided by the radio display, depending on the type of
navigation (basic - top of the range).
TYRE PRESSURE
MONITORThis function is provided by the following computers:
●UCH: responsible for the function, it also houses the receiver for tyre pressure
signals.
●Instrument panel: displays information relating to the tyre pressure monitor.
Note:
The tyre pressure is monitored by specific valves fitted with tyre pressure sensors.
AUTOMATIC
PARKING BRAKEThis function is provided by the following computers:●Automatic parking brake: manages the function and consists of the computer,
vehicle position sensor (gyroscope) as well as the mechanical cable locking /
unlocking system.
●Instrument panel: displays information about the automatic parking brake feature.
PARKING
ASSISTANCEThis function is provided by the following computers:●Parking assistance: manages the function with the instrument panel beeper
providing the user interface.

FAULT FINDING INTRODUCTION
General method
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2 - Design innovations:
These innovations concern services which are already in use but which are implemented in a specific way on the
Scénic II:
AIR CONDITIONINGThis service is standard on RENAULT vehicles, only the distribution of tasks is
specific:
●Air conditioning: responsible for user intention (management of temperature for
controlled air conditioning) and for mixing and distribution of air in the passenger
compartment (manual and controlled air conditioning).
●UCH: responsible for the heating function.
●Injection: responsible for management of the air conditioning (cold cycle).
●Switching Protection Unit: responsible for the power required for air conditioning
(compressor and engine cooling fan).
WIPERSThe distribution of the function is as follows:
●UCH: responsible for driver's intention, management of the wiper stalk and the rear
screen wiper.
●Switching Protection Unit: responsible for the power required for the windscreen
wiper.
LIGHTINGThis function has already been described in Section 1 - Functional innovations. Refer
to this section for further information.
Note:
In the case of lighting without XENON bulbs, the Switching Protection Unit manages
the dipped headlights.
ENGINE
MANAGEMENT -
INJECTION This function is shared by two computers:●Injection: management of programming and information associated with engine
management, and of the speed regulation and limitation function.
●Protection and Communication Unit: management of the power required for engine
management. The Protection and Communication Unit also incorporates the fuel
pump relay and actuators controlled by cable by the injection computer.

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–Testing other computers that support fault finding: this test consists of connection and identification of
the computers present on the vehicle which can support fault finding K / L lines.
●New fault finding topics: the fault finding topics are now split into two separate menus:
–Computer diagnosis:
similar to the existing fault finding topics apart from the changed menu presentation.
The states and parameters menus have been modified to allow simultaneous display of these data items
and divided into screens by function and sub-function (example: "ignition" sub-function in Injection).
In addition, the computer fault finding procedure allows access to the vehicle "repair" menu when replacing
parts to be matched with the vehicle (configuration, programming).
–Fault finding by function:
limited to computer fault finding present on the multiplex network of the vehicle
and to the keyless vehicle, air conditioning and tyre functions. This new type of fault finding allows an
overall diagnosis of a function to be made by simultaneous dialogue with all the computers involved in
providing the service. In this way, it is possible to simultaneously analyse all the components associated with
a function and also simultaneously supervise intersystem exchanges between the computers responsible
for a customer service.
Note:
In the event of detecting a faulty component, it is necessary to switch to computer fault finding mode to
perform the configuration operations - programming the replaced part.
If a function fault is detected, a physical part is replaced: hence the choices made concerning
navigation of the diagnostic tool.