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
01E-1
101EFAULT FINDING INTRODUCTION
ABBREVIATIONS
FAULT FINDING INTRODUCTION
General method
01E
01E-7
3 - Fault finding innovations:
Development of the electronic and functional design of the Mégane has necessitated changes in the fault finding
processing used. The main fault finding changes are as follows:
●Vehicle to fault-finding tool connection sensor: this equipment is required for communication with the
computers attached to the vehicle's main communications network: the multiplex network. It also enables
communication with the computers diagnosed with the K / L lines.
●New fault-finding tool navigation interface:
The navigation interface of the fault-finding tool has changed to accommodate the Scénic II. Note in particular
the following changes:
–Vehicle identification by entering the VIN:
This can be done manually, or automatically by querying the
vehicle. It also gives the After-Sales type, and the engine and gearbox type.
–Distinction between the fault finding and repair menus:
The fault finding menu incorporates all the
functionalities associated with analysis of an electrical or electronic fault (processing of faults, conformity
checking, actuator commands and processing by customer complaint) whereas the repair menu allows
performance of all the operations associated with replacement of a component and/or modification of the
diagnostic system configuration (configuration read operations, configuration, programming, specific
commands etc.).
●New electronic layout integrity test: As correct operation of the vehicle is dependent on the integrity of the
multiplex network (main functional communication network) and of the cabled electronic systems, the multiplex
network test has changed, becoming the vehicle electronic layout integrity test. The changes are as follows:
–Multiplex network test:
This test remains similar to that already used for RENAULT multiplex vehicles. But it
also incorporates a read of the number of faults from the multiplex computers, physical measurements of the
types of multiplex network faults (open circuit, short circuit to earth, short circuit to the +ve of the faulty rings)
and an assisted help procedure for detecting the defective computer or ring (in the event of total paralysis of
the network). IMPORTANT:
The airbag harness tests and the various physical measurement tests must always be carried out using the
existing diagnostic tool leads and modules.
IMPORTANT:
Entering the VIN, which associated with entering the repair order, can generate the Computer
Diagnostic Sheet electronically.
FAULT FINDING INTRODUCTION
General method
01E
Summary list of the computers and functions present on the Scénic II vehicle:
Computer name InstallationFault finding Main function Fault finding sub-
functions
Parking
assistance Optional
●Tool
●K / L lines
●"Backup radar" type
function with beeperNone
AirbagStandard
●Tool
●Multiplex network
●Passive protection by
deployment of airbagsNone
Anti-lock
braking systemStandard
●Tool
●Multiplex network
●Anti-lock braking in braking
phaseNone
Automatic
gearboxOptional
●Tool
●K / L lines (although
present on the
multiplex network)
●Automatic gear change
depending on driver
intentionNone
Driving school
unitOptional
●Self-diagnostic
●Multiplex network
●Management of the "dual
control" systemNone
Manual or
automatic air
conditioning Optional
●Manual air
conditioning cannot
support fault finding
●Tool for automatic
air conditioning
●Multiplex network
●Air conditioning: user
intention and passenger
compartment air
distributionAir conditioning
Electric power
assisted
steeringStandard
●Tool
●Multiplex network
●Power assisted steering Supplies the
steering wheel angle
to the electronic
stability control
program
Electronic
stability control
program
(including anti-
lock braking
system)Optional
●Tool
●Multiplex network
●Anti-lock braking function
●Electronic stability and
understeer programNone
Automatic
parking brakeOptional
●Tool
●K / L lines (although
present on the
multiplex network)
●Automatic parking brake
control while stopping and/
or startingNone
InjectionStandard
●Tool
●Multiplex network
●Engine management
computerKeyless vehicle
Air conditioning
LPG / NGVOptional
●Tool
●K / L lines (although
present on the
multiplex network)
●Injection management
LPG / VNGNone
01E-9
