key RENAULT TWINGO 2009 2.G Heating And Air Conditioning - Manual Air Conditioning Workshop Manual

62C-2
MR-413-X44-62C000$091_eng.mif
V1
62C
MANUAL AIR CONDITIONING
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 document and the Technical Notes concerning the injection system
fitted to the vehicle, and the UCH):
–Assisted fault finding (integrated into the diagnostic tool), Dialogys.
Wiring Diagrams:
–Visu Schéma (CD-ROM), paper.
Type of diagnostic tools
–CLIP + multiplex line sensor
Special tooling required
3. REMINDERS
Procedure
To run fault finding on the vehicle computers, proceed as follows:
–turn the ignition key to APC,
–Connect the diagnostic tool and carry out the required operations,
To cut off the + after ignition feed, proceed as follows:
–disconnect the diagnostic tool,
–turn the ignition key to OFF,
–switch off the ignition. Vehicle(s): New Twingo
Function concerned: Manual air conditioning
Special tooling required
Multimeter
Elé. 1681 Universal bornier
MR-413-X44-62C000$091_eng.mif

62C-18
MR-413-X44-62C000$455_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Function62C
Vehicle
multiplex
network
Heated rear screen
resistor relay
Summary of components controlled or managed by the MANUAL AIR CONDITIONING control panel:
Ventilation and air conditioning unit
Passenger
compartment
blower
Resistor
unitRecirculation
flapDistribution
flapMixing
flap
Actuator control
User control panel
User request management
(air conditioning button and
heated rear screen button
pressed)Button lighting (air conditioning
button and heated rear screen
button)Passenger compartment
blower operation signal
(running or stopped)
UCH
Transmission of air conditioning
request
Activation of the heated rear
screen request.
Key:
Wire connections =
Multiplex connections =
Mechanical connections =
(control cables)

62C-19
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MANUAL AIR CONDITIONING
Fault finding - Function62C
Vehicle
multiplex
network
Summary diagram of components controlled or managed by the UCH:
Summary diagram of components controlled or managed by the injection computer Rear screen de-icing and
rear-view mirror de-icer
(depending on version)External temperature
sensor
(depending on
version)
Actuator control Sensor management
UCH
Air conditioning request
managementHeated rear screen control
management
Relay No. 1 for
the Passenger
Compartment
Heating
ResistorsRelay No. 2 for
the Passenger
Compartment
Heating
ResistorsAir conditioning
compressorEngine cooling
fan assemblyEngine
coolant
temperature
sensorRefrigerant
fluid
pressure
sensor
Actuator control Sensor management
Engine injection computer
Management of the cold loop (refrigerant pressure, engine cooling fan activation request,
compressor activation authorisation, etc.)
Key:
Wire connections =
Multiplex connections =

62C-20
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MANUAL AIR CONDITIONING
Fault finding - Function62C
ET004: AIR
CONDITIONING
AUTHORISED.
Special notes:
This flowchart shows the tracks of the
compressor engagement request.
Components which may block this
request are not listed (passenger
compartment blower operation signal
for the UCH on manual version with
AC, correct refrigerant pressure for
the injection, etc.).
If the compressor does not engage
(one of the requests is not
transmitted): carry out a conformity
check.
Compressor control flowchart:
ET029: AIR
CONDITIONING
BUTTON
ET030: AIR
CONDITIONING
REQUEST 2UCH
ET088: COMPRESSOR
ACTIVATION
REQUESTInjection computer
Air conditioning
Compressor
Key:
Multiplex signals
Wire connections

62C-27
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MANUAL AIR CONDITIONING
Fault finding - Conformity check62C
SUB-FUNCTION: USER SELECTION
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Application conditions: engine stopped, ignition on, AIR CONDITIONING
SWITCHED OFF (Passenger compartment blower unit switched off and air
conditioning compressor not activated).
ComputerParameter or Status
checked or ActionDisplay and Notes Fault finding
UCH (see 87B,
Passenger
compartment
connection unit)ET028:Heated rear
screen buttonPRESSED if the heated
rear screen key on the
air conditioning control
panel is pressed.
RELEASED otherwise.In the event of a fault, refer to the
interpretation of this status.
Note:
This status only operates for
manual air conditioning and
heating versions.
ET029:Air conditioning
buttonPRESSED if the AC
button on the air
conditioning control
panel is pressed.
RELEASED otherwise.In the event of a fault, refer to the
interpretation of this status.
ET015:Passenger
compartment
blowerINACTIVE
(according to test
conditions: see Notes).In the event of a fault, refer to the
interpretation of this status.
Note:
This status only operates for
manual air conditioning and
heating versions.

62C-33
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MANUAL AIR CONDITIONING
Fault finding - Conformity check62C
SUB-FUNCTION: USER SELECTION
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Application conditions: engine at idle speed, AIR CONDITIONING OPERATING
(air conditioning compressor engaged).
ComputerParameter or Status
checked or ActionDisplay and Notes Fault finding
UCH (see 87B,
Passenger
compartment
connection unit)ET028:Heated rear
screen buttonPRESSED if the heated
rear screen key on the
air conditioning control
panel is pressed.
RELEASED otherwise.In the event of a fault, refer to the
interpretation of this status.
ET029:Air conditioning
buttonPRESSED if the AC
button on the air
conditioning control
panel is pressed.In the event of a fault, refer to the
interpretation of this status.
ET015:Passenger
compartment
blowerACTIVE
(according to test
conditions: see Notes).In the event of a fault, refer to the
interpretation of this status.