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

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

87G - 17
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check
87G
V6 MR-372-J84-87G000$528_eng.mif
UPC
Vdiag No.: 44
KEYLESS VEHICLE: Starting the engine
NOTESOnly check conformity after a complete check using the diagnostic tool.
Test conditions: Engine stopped, ignition on.
Order FunctionParameter or Status
checked or Action Display and notes Fault finding
1GearboxET004:Reverse gear
engagedYES
NO
In the event of a fault, refer to
the relevant fault finding
procedure. ET005:Manual gearbox
leverNEUTRAL
OUT OF NEUTRAL
NOT SUPPORTED, if
the vehicle is fitted with
an automatic gearbox
2StartingET010:Conditions for
engine start
satisfied.YES, if the conditions
for engine start have all
been satisfied and
after pressing the start
button
NO, if the engine start
conditions have not all
been satisfied or if the
engine start button has
not been pressed

87G - 22
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check
87G
V6 MR-372-J84-87G000$528_eng.mif
UPC
Vdiag No.: 44
KEYLESS VEHICLES: Starting the engine
NOTESOnly check conformity after a complete check using the diagnostic tool.
Condition for carrying out this operation: the engine must be running.
Order FunctionParameter or Status
checked or Action Display and Notes Fault finding
1GearboxET004:Reverse gear
engagedYES
NO
Refer to the relevant fault
finding procedure in the
event of a fault. ET005:Manual gearbox
leverNEUTRAL
OUT OF NEUTRAL
NOT SUPPORTED, if
the vehicle is fitted with
an automatic gearbox
2StartingET010:Conditions for
starting the
engine satisfied.YES, if the conditions
for starting the engine
have been met and
after a press on the
engine start button
NO, if the conditions
for starting the engine
have not been met or if
the engine start button
has not been pressed

87G - 34
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of statuses
87G
V6 MR-372-J84-87G000$660_eng.mif
UPC
Vdiag No.: 44
ET010
CONDITIONS FOR STARTING THE ENGINE SATISFIED
NOTESNo particular instructions.
In the Keyless vehicle function, check that the starting conditions are met.
The UPC participates in the engine start function by managing the switches on the gearbox.
Check the operation of the gearbox switches using statuses ET004 Reverse gear selected and ET005
Manual gearbox gear lever position then run fault finding on UCH start and engine management functions.
If the conditions have been satisfied and the starter does not work, refer to ALP 2.
If the fault is still present, contact the Techline.
AFTER REPAIRDeal with any other possible faults.
Switch off the ignition and carry out a road test followed by a test with the diagnostic
tool.