RENAULT SCENIC 2010 J95 / 3.G Engine Compartment Connection Unit Workshop Manual

Electrical equipment
"The repair procedures given by the manufacturer in this document are based on the
technical specifications current when it was prepared.
The procedures may be modified as a result of changes introduced by the
manufacturer in the production of the various component units and accessories from
which his vehicles are constructed."
V6
All rights reserved by Renault s.a.s.
Edition Anglaise
Copying or translating, in part or in full, of this document or use of the service part
reference numbering system is forbidden without the prior written authority of
Renault s.a.s.
© Renault s.a.s.
V6 MR-372-J84-87G000$000_engTOC.mif
ENGINE COMPARTMENT CONNECTION UNIT
UPC
Vdiag No.: 44
Fault finding - Introduction 87G - 2
Fault finding - System operation 87G - 7
Fault finding - Allocation of computer tracks 87G - 9
Fault finding - Replacing components 87G - 10
Fault finding - Configurations and programming 87G - 11
Fault finding - Summary of faults 87G - 12
Fault finding - Interpretation of faults 87G - 13
Fault finding - Conformity check 87G - 16
Fault finding - Status and parameter summary table 87G - 26
Fault finding - Interpretation of statuses 87G - 27
Fault finding - Interpretation of parameters 87G - 35
Fault finding - Interpretation of commands 87G - 36
Fault finding - Customer complaints 87G - 53
Fault finding - Fault Finding Chart (ALP) 87G - 54
87G
MR-372-J84-87G000$000_engTOC.mif

87G - 2
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Introduction
87G
V6 MR-372-J84-87G000$066_eng.mif
187G
UPC
Vdiag No.: 44ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Introduction
1. SCOPE OF THIS DOCUMENT
This document presents the fault finding procedure applicable to all computers with the following specifications:
2. PREREQUISITES FOR FAULT FINDING
Documentation type
Fault finding procedures (this manual):
–Assisted fault finding (integrated into the diagnostic tool), Dialogys.
Wiring diagrams:
–Visu-Schéma (CD-ROM), paper version.
Type of diagnostic tools
–CLIP
Special tooling required
3. RECAP
Procedure
To run diagnostics on the vehicle's computers, switch on the ignition in fault finding mode (forced + after ignition
feed).
Proceed as follows:
–insert the vehicle card in the card reader,
–press and hold Start button (longer than 5 seconds) with start conditions not fulfilled,
–connect the diagnostic tool and perform the desired operations.
To turn off the + APC feed proceed as follows:
–disconnect the diagnostic tool,
–press the Start button twice briefly (less than 3 seconds),
–check that the + APC has been turned off by the computer indicator lights on the instrument panel
being switched off. Vehicle(s): MEGANE II, SCENIC II
Function concerned: UPCName of computer: UPC
VDIAG No.: 44
Special tooling required
Multimeter
Universal bornier
Note:
The left-hand and right-hand xenon lamp computers are powered when the dipped beam headlights light up. It will
therefore not be possible to run fault finding on them until the ignition has been switched on in fault finding mode
(forced + APC) and the dipped beam headlights have been switched on.
MR-372-J84-87G000$066_eng.mif

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ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Introduction
87G
V6 MR-372-J84-87G000$066_eng.mif
UPC
Vdiag No.: 44
Faults
Faults are declared as either present or stored (depending on whether they appeared in a certain context and have
disappeared since, or whether they remain present but have not been diagnosed within the current context).
The present or stored status of the fault should be taken into consideration when the diagnostic tool is used after
the + after ignition feed has been connected (without any of the system components being activated).
For a present fault, apply the procedure described in the Interpretation of faults section.
For a stored fault, note the faults displayed and apply the instructions in the Notes section.
If the fault is confirmed when the instructions in the Notes section are applied, the fault is present. Deal with the fault
If the fault is not confirmed, check:
–the electrical lines which correspond to the fault,
–the connectors on these lines (corrosion, bent pins, etc.),
–the resistance of the component detected as faulty,
–the condition of the wires (melted or split insulation, wear).
Conformity check
The aim of the conformity check is to check statuses and parameters that do not produce a fault display on the
diagnostic tool when they are inconsistent. Therefore, this phase is used to:
–carry out fault finding on faults that do not have a fault display, and which may correspond to a customer
complaint.
–check that the system is operating correctly and that there is no risk of a fault recurring after repair.
This section gives the fault finding procedures for statuses and parameters and the conditions for checking them.
If a status is not behaving normally or a parameter is outside the permitted tolerance values, consult the
corresponding fault finding page.
Customer complaints - Fault finding chart
If the test with the diagnostic tool is OK but the customer complaint is still present, the fault should be dealt with by
customer complaints.
A summary of the overall procedure to follow is provided on the following
page in the form of a flow chart.

87G - 4
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Introduction
87G
V6 MR-372-J84-87G000$066_eng.mif
UPC
Vdiag No.: 44
4. FAULT FINDING PROCEDURE
Check the battery charge and the
condition of the fuses
Print the system fault finding log
(available on CLIP or in the
Workshop Repair Manual or the
Technical Note)
Connect CLIP
no
Dialogue with
computer?
yes
Read the faults
no
Faults present
yes
Deal with present faults
Deal with stored faults
no
The cause is
still presentFault
solved
yes
See Fault Finding Chart no. 1
Conformity check
no
The cause is
still presentFault
solved
Use the fault finding charts
no
The cause is
still presentFault
solved
Contact the Techline with the
completed fault finding log

87G - 5
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Introduction
87G
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UPC
Vdiag No.: 44
Wiring check:
Fault finding problems:
Disconnecting the connectors and/or manipulating the wiring harness may temporarily remove the cause of a fault.
Electrical measurements of voltage, resistance and insulation are generally correct, especially if the fault is not
present when the analysis is made (stored fault).
Visual inspection:
Look for damage under the bonnet and in the passenger compartment.
Carefully check the protective parts, insulators and wiring harness routing.
Look for signs of oxidation.
Tactile inspection:
While manipulating the wiring harness, use the diagnostic tool to note any change in fault status from stored to
present.
Make sure that the connectors are properly tightened,
Apply light pressure to the connectors,
Twist the wiring harness.
If there is a change in status, try to locate the source of the fault.
Inspection of each component:
Disconnect the connectors and check the appearance of the clips and tabs, as well as their crimping (no crimping on
the insulating section).
Make sure that the clips and tabs are properly locked in the sockets.
Check that no clips or tabs have been dislodged during connection.
Check the clip contact pressure using an appropriate model of tab.
Resistance check:
Check the continuity of entire lines, then section by section.
Look for a short circuit to earth, the +12 V feed or with another wire.
If a fault is detected, repair or replace the wiring harness.

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ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Introduction
87G
V6 MR-372-J84-87G000$066_eng.mif
UPC
Vdiag No.: 44
5. FAULT FINDING PROCEDURE
You are always asked for this log:
–when requesting technical assistance from the Techline,
–for approval requests when replacing parts for which approval is obligatory,
–to be enclosed when returning monitored parts on request. The log is needed for warranty compensation, and
enables better analysis of the parts removed.
6. SAFETY ADVICE
All work on components requires that the safety rules be obeyed to prevent damage or injury:
–Make sure that the battery is properly charged to avoid damaging the computers with a low load.
–Use the appropriate tools.WARNING!IMPORTANT
Any fault on a complex system requires thorough fault finding with the appropriate tools. The
FAULT FINDING LOG, which should be completed during the procedure, enables you to keep
track of the procedure which is carried out. It is an essential document when consulting the
manufacturer.
IT IS THEREFORE MANDATORY TO FILL OUT A FAULT FINDING LOG FOR EACH FAULT FINDING
PROCEDURE.

87G - 7
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87G
V6 MR-372-J84-87G000$132_eng.mif
UPC
Vdiag No.: 44ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - System operation
1. GENERAL FUNCTIONING
The UPC particpates in the following functions:
–distributing and protecting the electrical power,
–keyless vehicles,
–wipers,
–lighting,
–de-icing,
–air conditioning,
–oil pressure detection.
Distributing and protecting electrical power
The main function of the UPC is to switch on and distribute part of the power in order to supply the vehicle systems,
actuators or computers.
Another part of the power supply distribution is housed in the Engine Interconnection Unit but is not controlled
electronically by the computer.
+12 V battery feed
The UPC receives energy from the battery via the 1 track screwed connector and redistributes +12 V around the
vehicle.
+ after ignition feed
The UCH requests the + APC via the multiplex network. When the UPC receives this request, it controls the APC
relay unconditionally.
Energy management
The computer transmits the signal to load the alternator on the multiplex network.
Keyless vehicle
In the Keyless vehicle function, the UPC participates in the start-up sub-function. The computer:
–receives the request to start up the UCH via the multiplex network,
–check that the start-up conditions have been met then controls the starter relay,
–can inhibit or turn off the starter relay command by means of a forbid start-up signal transmitted by the
injection computer on the multiplex network.
Air conditioning
For the operation of this function and the role of the UPC in setting up this function (see 62A, Air conditioning,
Function architecture and General functioning mode).
Cold loop
The computer receives the compressor switch-on request from the injection via the multiplex network.
The computer controls the compressor clutch activation relay.
Heating
The computer also controls the de-icing of the rear tailgate window and the electric rear view mirrors.
Fan assembly
When prompted for the engine check request, the UPC supplies the GMV with power.
MR-372-J84-87G000$132_eng.mif

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ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87G
V6 MR-372-J84-87G000$132_eng.mif
UPC
Vdiag No.: 44
Front wipers
The UPC receives the wiping requests from the UCH via the multiplex network.
The computer then controls the following requests:
–low or high speed windscreen wiper,
–windscreen wiper park position.
Lights
The UPC receives the lighting requests from the UCH via the multiplex network.
The computer then controls the following requests:
–side lights,
–dipped beam headlights,
–main beam headlights,
–front fog light.
Detecting the oil pressure
The UPC receives the signal from the oil pressure sensor and makes it available on the multiplex network.
2. UPC LEVELS
3 UPC levels can be fitted on vehicles:
–Entry level UPC,
–Top of the range UPC N2,
–Top of the range UPC N3.
Only the top of the range N2 and N3 UPCs are available as spare parts.
The N2 and N3 versions can be distinguished in the extent to which they control the high speed blower:
–on the N2, the UPC controls an external relay,
–on N3, the relay is integrated into the UPC.

87G - 9
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Allocation of computer tracks
87G
V6 MR-372-J84-87G000$198_eng.mif
UPC
Vdiag No.: 44ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Allocation of computer tracks
The UPC is located in the Engine Interconnection Unit (engine compartment).
Refer to the NT electrical diagrams for the vehicle on which the fault finding was run for the track allocations and to
consult the electrical diagrams.
MR-372-J84-87G000$198_eng.mif

87G - 10
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Replacing components
87G
V6 MR-372-J84-87G000$264_eng.mif
UPC
Vdiag No.: 44ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Replacing components
1. REPLACING THE COMPUTER
See Workshop repair Manual 364 Mechanics, 87G, Engine interconnection unit (Mégane) or Workshop
Repair Manual 370 Mechanics, 87G, Engine interconnection unit (Scénic).
After replacing:
●Configure the alternator type using command CF001 Alternator type (see Configurations and programming).
●Enter the vehicle VIN using command VP003 Enter VIN.
MR-372-J84-87G000$264_eng.mif