sensor RENAULT TWINGO RS 2009 2.G Heating And Air Conditioning - Climate Control Workshop Manual

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62B
CLIMATE CONTROL
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 perform 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: Climate controlComputer name: CAREG
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Special tooling required
Multimeter
Elé. 1681 Universal bornier
CLIM_V44_PRELI

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Vdiag No.: 44CLIMATE CONTROL
Fault finding - Introduction62B
The conformity check for the air conditioning function is split into two parts:
For all signals relating to the sensors and actuators controlled by the climate control panel (distribution motor,
mixing motor, recirculation motor, passenger compartment ventilation, interior temperature, etc.), (see 62B, Climate
control, Conformity check).
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 processed by
customer complaints. Note:
The interpretation of statuses, parameters and commands is also split into several sections. Everything which is
controlled by the control panel of the climate control function is dealt with in this section. However, signals from
other computers are interpreted in the Fault finding Workshop Repair Manuals for the computers which
produce these signals.
A summary of the overall procedure to follow is provided on the following page in the
form of a flow chart.

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Fault finding - List and location of components

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62B
●HEATING COMPONENTS
–Heater matrix: This is located at the bottom of the heating and air conditioning unit.
–Passenger compartment heating resistors: These are located at the bottom of the heater matrix on the
driver's side (depending on the equipment).
●SENSOR
–Interior temperature sensor: This is located on the interior rear-view mirror.
●ACTUATORS
–Air distribution flap: This is located in the heating and air conditioning unit.
–Air mixing flap: This is located in the heating and air conditioning unit.
–Recirculation flap: This is located behind the dashboard.
–Flap motors: These are located close to the flaps.
●OTHERS
–Passenger compartment blower unit: This is located in the heating and air conditioning unit.
–Cooling fan assembly: This is located in the front panel of the vehicle, in front of the condenser.
–Climate control computer: This is located in the control panel.
–Air pipes: Theses are located under the dashboard.

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Fault finding - Role of components

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62B
–High and low pressure pipes: (see figure below)
●The High Pressure and Low Pressure pipes are composed of rigid aluminium pipes and flexible pipes that
enable engine-related movements to be absorbed.
●Two filler valves (High Pressure and Low Pressure) can be accessed in order to fill (or drain) the refrigerant loop.
●The connections must be checked in the event of a refrigerant fluid leak.
Cold loop pipes
1Buffering capacity
2Expansion valve outlet
3Expansion valve inlet
4High pressure filler valve
5Low pressure filler valve
6Condenser inlet
7Condenser outlet
8Pressure sensor
9Compressor inlet
10 Compressor outlet
●HEATING COMPONENTS
–Heater matrix:
The external air entering the heating and air conditioning device (HVAC) is heated by the heater matrix.
–Passenger Compartment Heating Resistors (depending on the equipment): (see figure below)
The passenger compartment heating resistors (RCH) are electrical heating devices in the air conditioning unit. This
system is an additional heating system which operates when the engine is cold (when starting).

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Fault finding - Role of components

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62B
Passenger Compartment Heating Resistors (RCH)
●SENSOR
–Interior temperature sensor:
This sensor is used to measure the air temperature of the passenger compartment.
●ACTUATORS
–Air distribution flap:
This flap enables the air flowing into the passenger compartment to be directed.
–Air mixing flap:
This flap enables the temperature requirements of the occupants to be met.
–Recirculation flap:
This flap prevents the entry of exterior air. In this case, the passenger compartment is isolated from the exterior and
air is blown in the passenger compartment in a closed circuit.
–Flap motors: these motors enable the flaps to be moved electrically. There are 3 motors: One motor for the air
mixing flap (stepper-motor), one motor for the distribution flap (stepper-motor) and one motor for the
recirculation flap (direct current motor).
●OTHERS
–Passenger compartment blower unit:
The passenger compartment blower unit is controlled by the Electronic Blower Dimmer Module (MVPE).
Electronic Blower Dimmer Module (MVPE)

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Fault finding - Operating diagram
Summary diagram of all the components of the air conditioning system
1Evaporator
2Temperature sensor
3Compressor
4Condenser
5Fan assembly
6Pressure switch
7Dehydration canister
8Expansion valve

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CLIMATE CONTROL
Fault finding - Function
GENERAL INFORMATION:
The climate control function which is fitted to the new Twingo depends on the three computers: injection, UCH and
climate control (DISTRIBUTED FUNCTION).
Fault finding on the air conditioning is performed in two different ways using the diagnostic tool.
The first procedure consists of performing fault finding on each computer which allows dialogue to be established
with just one computer (select the climate control computer).
The second procedure consists of performing fault finding on each function which allows communication with all
three computers belonging to the CLIMATE CONTROL function.
DESCRIPTION OF THE OPERATION OF THE CLIMATE CONTROL COMPUTER:
The climate control computer controls the passenger compartment ventilation, the distribution motor, the mixing
motor and the recirculation motor.
The climate control computer also controls the interior temperature sensor.
The sensor and the three motors are connected to the climate control computer by wire connections. The climate
control computer controls the passenger compartment ventilation using a modulated control signal (square pulse
signal) sent to a power module (MVPE) by a wire connection.
All other signals used by the climate control computer or transmitted by this computer to other computers are sent on
the multiplex network.
The production of cold air (cold loop) and hot air (heating) is controlled by the other two computers involved in the
CLIMATE CONTROL function (UCH and engine injection computer).
Special notes on operation:
–When the engine is stopped, the passenger compartment fan rotates more slowly than when the engine is
running.
–If any of the actuators are faulty, the air conditioning can no longer control them, but the setting requests are still
displayed on the control panel: warning lights light up, display of symbols on the control panel (distribution motor
position, passenger compartment blower speed, AC symbol, etc.).

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Vdiag No.: 44CLIMATE CONTROL
Fault finding - Function62B
Vehicle
multiplex
network
Internal
temperature
sensor
SUMMARY OF ELEMENTS CONTROLLED OR MANAGED BY THE CLIMATE CONTROL COMPUTER:
Ventilation and air conditioning unit
Passenger
comp. blower
Passenger
compartment
blower
power
module
Recirculation
motorDistribution
motorAir mixing
motor
Actuator control Sensor management
Climate control computer (control panel)
Climate
control
management
(hot/cold)Button lightingUser requests
management
(button presses)
Key:
Wire connections =
Multiplex connections =

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Fault finding - Function62B
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 =

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CLIMATE CONTROL
Fault finding - Fault summary table
SUMMARY OF SENSORS AND ACTUATORS ON WHICH FAULT FINDING CAN BE PERFORMED BY THE
CLIMATE CONTROL COMPUTER (with corresponding design office codes)
Tool faultAssociated
DTCDiagnostic tool title
DF0019105 Computer
DF0079101 Interior temperature sensor circuit
DF0109107 Mixing motor circuit
DF0129108 Distribution motor circuit
DF0219106 Air recirculation motor circuit

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