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

Heating and
air conditioning system
"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."
V1
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.
V1 MR-413-X44-61A000$000_engTOC.mif
HEATING
Fault finding - Introduction 61A - 2
Fault finding - List and location of components 61A - 5
Fault finding - Role of components 61A - 6
Fault finding - Function 61A - 8
Fault finding - Conformity check 61A - 11
Fault finding - Customer complaints 61A - 18
Fault finding - Fault finding charts 61A - 19
61A
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61A
HEATING
Fault finding - List and location of components
Passenger Compartment Heating Resistor (RCH) location
1Without Passenger Compartment Heating Resistors (RCH)
2With Passenger Compartment Heating Resistors (RCH)
Passenger compartment fan unit
●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).
●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.
●OTHERS
–Passenger compartment blower unit: This is located in the heating and air conditioning unit.
–Air pipes: Theses are located under the dashboard.
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61A
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 version):
The passenger compartment heating resistors are an electric heating system located in the passenger compartment
ventilation heating unit. This system acts as an additional heater which operates when the engine is cold (when
starting).
Passenger Compartment Heating Resistors (RCH)
●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.
●OTHERS
–Passenger compartment blower unit:
The passenger compartment blower unit is controlled by the MVPR (Resistive Blower Dimmer Module).
HEATING
Fault finding - Role of components
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61A
HEATING
Fault finding - Conformity check
SUB-FUNCTION: HEATING
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Test conditions: engine stopped, ignition on.
ComputerParameter or Status
checked or ActionDisplay and
notesFault finding
UCH (see 87B,
Passenger
compartment
connection unit)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.
PR001: Battery voltage10.5 V < X < 14.4 VIf there is a fault, refer to the
interpretation of this parameter
If the fault is still present, carry out
fault finding on the charging circuit
(see MR 411 Mechanical, 16A,
Starting - charging circuit).
PR002: Exterior
temperature
(depending on
equipment)X = exterior temperature ± 5 °C
(invalid value: 215 °C)If there is a fault, refer to the
interpretation of this parameter
PR024: Engine coolant
temperatureX = engine coolant
temperature in ˚CIn the event of a fault, see the
interpretation of this parameter.
ET239: Ignition switch
position+ after ignition feedIn the event of a fault, refer to the
interpretation of this status.
PR025: Engine speed0 rpmIf there is a fault, refer to the
interpretation of this parameter
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HEATING
Fault finding - Conformity check61A
SUB-FUNCTION: USER SELECTION
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Test conditions: engine stopped, ignition on.
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.
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.

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HEATING
Fault finding - Conformity check61A
SUB-FUNCTION: HEATING
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, vehicle speed zero.
ComputerParameter or Status
checked or ActionDisplay and Notes Fault finding
UCH (continued)
(see 87B,
Passenger
compartment
connection unit)ET239: Ignition switch
position+ after ignition feedIn the event of a fault, refer to the
interpretation of this status.
PR025: Engine speed800 rpm ± 50 rpmIn the event of a fault, see the
interpretation of this parameter.
PR024: Engine coolant
temperatureX = engine coolant
temperatureIn the event of a fault, see the
interpretation of this parameter.
ET015: Passenger
compartment
blowerACTIVE
(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.
PR001: Battery voltage12.5 V < X < 14.4 VIn the event of a fault, see the
interpretation of this parameter. If
the fault is still present, carry out fault
finding on the charging circuit
(see MR 411 Mechanical, 16A,
Starting - charging circuit).
PR002: Exterior
temperature
(depending on
equipment)X = exterior temperature:
5 ˚C (invalid value:
215 ˚C)In the event of a fault, see the
interpretation of this parameter.

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HEATING
Fault finding - Conformity check61A
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, vehicle speed zero.
ComputerParameter or Status
checked or ActionDisplay and
notesFault 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.
ET015:Passenger
compartment
blowerACTIVE
(according to test conditions:
see Notes).In the event of a fault, refer to the
interpretation of this status.

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HEATING
Fault finding - Conformity check61A
SUMMARY TABLE OF THE VARIOUS AIR CONDITIONING COMPUTER COMMANDS
Name of sub-function Name of computer Command name Fault finding
HEATINGUCH (see 87B,
Passenger
compartment
connection unit)AC060 Rear screen
de-icerIn the event of a fault, refer
to the interpretation of
this command.
Injection (see 13B, Diesel
injection or 17B, Petrol
injection)AC250 Heating resistor
relay 1 (depending on
version)In the event of a fault, refer
to the interpretation of
this command.
AC251 Heating resistor
relay 2 (depending on
version)In the event of a fault, refer
to the interpretation of
this command.
USER SELECTIONUCH (see 87B,
Passenger
compartment
connection unit)AC019 Heated rear
screen indicator lightIn the event of a fault, refer
to the interpretation of
this command.

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61A
HEATING
Fault finding - Fault finding charts
ALP 6 No heating or inadequate heating
NOTESCarry out these checks after a full check using the diagnostic tool (fault reading and
configuration checks).
Check that the fuses are sound.
Use a multimeter, current clamp and 21 W test light.
Use the Wiring Diagrams Technical Note, NEW TWINGO.
Is the air flow correct?
YES
Is the air distribution correct?
YES
With a warm engine, set the heating to max.
Is the blown air hot?
NO
Using the parameter and statuses screen on the
diagnostic tool (Heating and UCH or Climate
Control sub-functions: 62B), check that the
temperature signals are consistent (no sensor
deviation resulting in incorrect measurement).
For manual air conditioning systems:
–Use parameters PR002 Exterior temperature
(depending on option) and PR024 Engine
coolant temperature.
For climate control systems:
–Use parameters PR002 Exterior
temperature, PR004 Coolant temperature
and PR001 Interior temperature.
Are the temperature signals consistent?
YES
NOSee ALP3 Air flow fault, air flow fault.
NOSee ALP2 Air distribution fault, air
distribution fault.
YESIf necessary, explain how the system works to
the customer again.
Carry 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.
NO
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HEATING
Fault finding - Fault finding charts61A
ALP 6
CONTINUED 1
With the engine warm and
passenger compartment
ventilation operating, vary the
position of the mixing flap from
the maximum cold position to
the maximum hot position and
check subjectively that there is a
dif ference in temperature.
Is a difference in temperature
noted?
YES
NO
For climate control systems:
Carry out a conformity check on the mixing motor (PR012
Mixing flap position). If the conformity check does not reveal
any faults, look for a mechanical fault on the mixing flap
(condition of the motor ’s notched sector, flap jammed inside the unit, etc.).
For manual air conditioning and heater versions:
Check the condition and routing of the mixing flap control cable.
Eliminate any constraints it may have such as kinks, restriction by plastic
clips, etc.
Replace the lead if necessary. Unclip the cable from the side of the heating/
air conditioning unit and check the stiffness of movement of each
component: control button and flap control on the air distribution unit. Check
that there is no mechanical fault with the mixing flap (flap jammed inside the
unit, etc.).
Carry out any necessary repairs.
Is the fault still present?
YES NO
Is the lower heater matrix pipe (coolant inlet) hot?
Note: Pipe located on the left-hand side of the
heater-air conditioning unit, near the engine bulkhead.
YES NO
End of fault finding
procedure.
Check that the heater matrix is not blocked: the top
heater matrix outlet pipe should be hot. Clean the
heater matrix or replace it if necessary (see MR 411,
Mechanical, 61A, Heating, Heater matrix: Removal
- Refitting).
Is the fault still present?
NO
Check the coolant circuit:
Check the level of the coolant circuit (too low a level
may unprime the circuit when driving at low loads and
when idling).
Check that the thermostatic valve opens at the
correct temperature, and replace the valve if
necessary (see MR 411, Mechanical, 19A, cooling,
thermostat:
Removal - Refitting).
End of fault finding
procedure.
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