engine coolant RENAULT TWINGO 2009 2.G Heating And Air Conditioning - Climate Control Workshop Manual

62B-8
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62B
CLIMATE CONTROL
Fault finding - List and location of components
List and location of components
System (cold loop, hot loop and components)
1Heating and air conditioning unit
2Heater matrix
3Expansion valve and evaporator
4Coolant circuit
5Cold loop
6Condenser and radiator
7Compressor
●COLD LOOP COMPONENTS
–Compressor: This is located at the bottom on the left-hand side, next to the radiator in the engine compartment.
–Condenser: This is located between the radiator and the cooling fan assembly.
–Dehydrator reservoir: This is located on the left-hand side of the condenser outlet.
–Heating and air conditioning unit: This is located under the dashboard.
–Thermostatic expansion valve: This is located to the left of the heating and air conditioning unit on the
bulkhead.
–Evaporator: This is located to the right of the thermostatic expansion valve in the heating and air conditioning
unit.
–High pressure pipe: This pipe connects the compressor, condenser, dehydrator reservoir, and expansion valve
inlet in series (it is located in the engine compartment on the left-hand side).
–Low pressure pipe: This pipe connects the expansion valve, buffering capacity, evaporator, and compressor
inlet in series (it is located in the engine compartment on the left-hand side).

Vdiag No.: 44
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Vdiag No.: 44CLIMATE CONTROL
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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62B
CLIMATE CONTROL
Fault finding - Conformity check
SUB-FUNCTION: PASSENGER COMPARTMENT VENTILATION
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Application conditions: engine stopped with ignition on (12 V APC), AIR
CONDITIONING OFF (air conditioning compressor not activated).
Note:
–Read the parameters when the vehicle is cold (in the morning) to check the
conformity of the temperature parameters (without thermometer). The two
temperatures should be practically the same (as should the coolant temperature
given by the injection system).
–The invalid values given in this check correspond to the value sent by the diagnostic
tool (substitute value) when the sensor in question is faulty. A sensor fault can be
detected when these invalid values are displayed (this is an important point for
sensors on which fault finding cannot be performed, e.g. exterior temperature
sensor).
Delayed illumination of the exterior temperature sensor LCD indicates that an invalid
value has been received concerning the exterior temperature sensor.
FunctionParameter or Status
checked or ActionDisplay and Notes Fault finding
Passenger
compartment
blowerET141:Passenger
compartment
blowerRUNNING
or
STOPPED
After a user requestIn the event of a fault, refer to the
interpretation of this status.
PR019:Passenger
compartment
fan PWM settingSpeed 0 = 0 %
Speed 8 = 100 %
Note:
The PWM signal is a
modulated control
voltage used to control
the air conditioning
blower power module.If there is a fault or for more
information (to find the
intermediate speed
percentages), refer to the
interpretation of this
parameter.
Note:
If the parameter varies correctly,
but the passenger compartment
blower unit does not operate:
consult ALP 5 "Air flow fault"
Air flapsPR012:Mixing flap
positionFrom 0 % (“Maximum
cold” position: 15 ˚C)
to 100 % (“Maximum
hot” position: 27 ˚C).In the event of a fault, see the
interpretation of this
parameter.
ET062:Recirculation
flap positionOPEN if the flap is in the
external air position.
CLOSED if the flap is in
the recirculation
position.In the event of a fault, refer to the
interpretation of this status.
PR011:Distribution flap
positionFrom 0 % (Air vent
position)
to 100 % (De-icing
position)In the event of a fault, see the
interpretation of this
parameter.
CLIM_V44_CCONF

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Vdiag No.: 44CLIMATE CONTROL
Fault finding - Conformity check62B
HEATING SUB-FUNCTION
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Application conditions: engine stopped with ignition on (12 V APC), CLIMATE
CONTROL OFF (air conditioning compressor not engaged).
FunctionParameter or Status
checked or ActionDisplay and Notes Fault finding
Heated rear screenET086:Heated rear
screen: manual
modeINACTIVE In the event of a fault, refer to the
interpretation of this status.
ET085:Heated rear
screen:
automatic modeINACTIVE In the event of a fault, refer to the
interpretation of this status.
Passenger
compartment
ventilatorET141:Passenger
compartment
ventilatorRUNNING
or
STOPPED
After a user requestIn the event of a fault, refer to the
interpretation of this status.
Air mixing motorPR012:Mixing flap
positionFrom 0 % (“Maximum
cold” position: 15 ˚C)
to 100 % (“Maximum
hot” position: 27 ˚C).In the event of a fault, see the
interpretation of this
parameter.
HeatingPR045:Current heating
resistor power0 WIn the event of a fault, see the
interpretation of this
parameter.
TemperaturePR001:Interior
temperatureX = interior
temperature ± 5 ˚C
(invalid value: 87.5 ˚C)In the event of a fault, see the
interpretation of this
parameter.
PR002:External
temperatureX = exterior
temperature ± 5 ˚C
(invalid value: 215 ˚C)In the event of a fault, consult the
interpretation of this
parameter.
Note:
This parameter is displayed via
the climate control computer but
is generated by the UCH.
PR004:Coolant
temperatureX = engine coolant
temperature in ˚CIn the event of a fault, see the
interpretation of this
parameter.

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Vdiag No.: 44CLIMATE CONTROL
Fault finding - Conformity check62B
SUB-FUNCTION: PASSENGER COMPARTMENT VENTILATION
NOTESOnly carry out this conformity check after a full check using the diagnostic tool
(fault reading and configuration checks).
Application conditions: engine running, AIR CONDITIONING ON (air conditioning
compressor activated).
Note:
–Read the parameters when the vehicle is cold (in the morning) to check the
conformity of the temperature parameters (without thermometer). The two
temperatures should be practically the same (as should the coolant temperature
given by the injection system).
–The invalid values given in this check correspond to the value sent by the diagnostic
tool (substitute value) when the sensor in question is faulty. A sensor fault can be
detected when these invalid values are displayed (this is an important point for
sensors on which fault finding cannot be performed, e.g. exterior temperature
sensor).
FunctionParameter or Status
checked or ActionDisplay and Notes Fault finding
Passenger
compartment
blowerPR019: Passenger
compartment
fan PWM settingSpeed 0 = 0 %
Speed 8 = 100 %
Note:
The PWM signal is a
modulated control
voltage used to control
the air conditioning
blower power module.If there is a fault or for more
information (to find the
intermediate speed
percentages), refer to the
interpretation of this
parameter.
Note:
If the parameter varies correctly,
but the passenger compartment
blower unit is not working: refer to
fault finding chart no. 5.
ET141: Passenger
compartment
blowerRUNNING
or
STOPPED
After a user request.In the event of a fault, refer to the
interpretation of this status.
Air flapsPR012: Mixing flap
positionFrom 0 % (“Maximum
cold” position: 15 ˚C)
to 100 % (“Maximum
hot” position: 27 ˚C).In the event of a fault, see the
interpretation of this
parameter.
ET062: Recirculation
flap positionOPEN if the flap is in the
external air position.
CLOSED if the flap is in
the recirculation
position.In the event of a fault, refer to the
interpretation of this status.
PR011: Distribution flap
positionFrom 0 % (Air vent
position)
to 100 % (De-icing
position).In the event of a fault, refer to the
interpretation of this status.

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Vdiag No.: 44CLIMATE CONTROL
Fault finding - Conformity check62B
HEATING SUB-FUNCTION
NOTESOnly carry out this conformity check after a full check using the diagnostic tool
(fault reading and configuration checks).
Application conditions: engine running, AIR CONDITIONING ON (air conditioning
compressor activated).
Order FunctionParameter or Status
checked or ActionDisplay and Notes Fault finding
1Heated rear
screenET086: Heated rear
screen: manual
modeACTIVE: De-icing
request using the control
button.
INACTIVE otherwise.In the event of a fault, refer
to the interpretation of this
status.
ET085:Heated rear
screen:
automatic modeACTIVE: De-icing
request using the control
button. (“see clear”
function)
INACTIVE otherwise.In the event of a fault, refer
to the interpretation of this
status.
2Passenger
compartment
blowerET141:Passenger
compartment
blowerRUNNINGIn the event of a fault, refer
to the interpretation of this
status.
3Air mixing
motorPR012:Mixing flap
positionFrom 0 % (“Maximum
cold” position: 15 ˚C
to 100 % = “Maximum
hot” position: 27 ˚C).In the event of a fault, see
the interpretation of this
parameter.
4HeatingPR045:Current heating
resistor power0 < X < 900 WIn the event of a fault, see
the interpretation of this
parameter.
5TemperaturePR001:Interior
temperatureX = interior
temperature ± 5 ˚C
(invalid value: 87.5 ˚C)In the event of a fault, see
the interpretation of this
parameter.
PR002: External
temperatureX = exterior
temperature ± 5 ˚C
(invalid value: 215 ˚C)In the event of a fault, see
the interpretation of this
parameter
Note:
This parameter is displayed
via the climate control
computer but is generated
by the UCH.
PR004:Coolant
temperatureX = engine coolant
temperature in ˚C.In the event of a fault, see
the interpretation of this
parameter.

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62B
CLIMATE CONTROL
Fault finding - Interpretation of parameters
PR001
INTERIOR TEMPERATURE
NOTESNone
The climate control computer receives the interior temperature signal through a wire connection.
Read the temperature signal when the vehicle is cold (in the morning) to check the conformity of this parameter
(without a thermometer). The interior temperature, the exterior temperature and the engine coolant temperature
should be practically the same.
Another way of checking whether this sensor is correct is to check the resistance value of the sensor according to
temperature: refer to the electrical specifications of the sensor in the Help section (at the end of the document).
If the temperature displayed by this parameter is implausible, apply the fault finding procedure for fault: DF007
Interior temperature sensor circuit.
AFTER REPAIRRepeat the conformity check from the start.
CLIM_V44_PR001
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CLIMATE CONTROL
Fault finding - Interpretation of parameters
Vdiag No.: 44
62B
PR002
EXTERNAL TEMPERATURE
NOTESNone
The climate control computer receives the exterior temperature signal through the multiplex line via the UCH.
Read the temperature signal when the vehicle is cold (in the morning) to check the conformity of this parameter
(without a thermometer). The interior temperature, the exterior temperature and the engine coolant temperature
should be practically the same.
If the temperature displayed by this parameter appears inconsistent: carry out fault finding on the UCH
(see 87B, UCH).
AFTER REPAIRRepeat the conformity check from the start.
CLIM_V44_PR002

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CLIMATE CONTROL
Fault finding - Interpretation of parameters
Vdiag No.: 44
62B
PR004
COOLANT TEMPERATURE
NOTESSpecial note:
The climate control computer receives the engine coolant temperature signal through
the multiplex line via the injection system.
Read the temperature signal when the vehicle is cold (in the morning) to check the conformity of this parameter
(without a thermometer). The interior temperature, the exterior temperature and the engine coolant temperature
should be practically the same.
If the temperature displayed by this parameter appears inconsistent, carry out fault finding on the injection system
(see 13B, Diesel injection or 17B, Petrol injection).
AFTER REPAIRRepeat the conformity check from the start.
CLIM_V44_PR004

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Vdiag No.: 44CLIMATE CONTROL
Diagnostic - Fault finding chart62B
ALP 8
CONTINUED 1
1
Using the diagnostic tool statuses and parameters
screen (cold loop sub-function), check that the
temperature signals are consistent (no sensor
deviation resulting in incorrect measurement).
–Using parameters PR002
"exterior temperature", PR064
"coolant temperature" and PR001
"interior temperature".
Are the temperature signals consistent?
YES
Start the engine and switch on the air conditioning
by pressing the AC button (with a request for
maximum cold temperature and the passenger
compartment blower running).
Display the following status in the “User selection”
sub-function screen:
ET140 "air conditioning request" should be
ACTIVE and the “AC” symbol should be displayed
on the air conditioning control panel screen.
Is status ET140 ACTIVE?
YES
NOCarry out a conformity check:
–For the coolant temperature sensor,
see 13B, Diesel injection, Fault
summary table or 17B Petrol
injection, Fault summary table.
–For the exterior temperature sensor,
see 87B, Passenger compartment
connection unit, Fault summary
table.
–For the interior temperature sensor,
see 62B, Climate control, Fault
summary table.
Replace any faulty components.
NOAir conditioning request interpretation fault
on the climate control computer. Carry out
fault finding on the climate control
computer (see interpretation of
statuses).
AFTER REPAIRCarry out a complete check with the diagnostic tool.