2009 RENAULT TWINGO RS heating

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MANUAL AIR CONDITIONING
Fault finding - Conformity check62C
SUMMARY TABLE OF THE VARIOUS AIR CONDITIONING COMPUTER COMMANDS
Fault finding procedures for the commands listed in this summary are explained in the Workshop Repair Manuals
relating to the computer which generates the signal (see Introduction). Name of sub-function Name of computer Command name Fault finding
COLD LOOPInjection (see 13B, Diesel
injection or 17B, Petrol
injection)AC180: Air conditioning
compressor relay
controlIn the event of a fault, refer
to the interpretation of
this command.
AC153 High speed fan
assemblyIn the event of a fault, refer
to the interpretation of
this command.
AC154 Low speed fan
assemblyIn the event of a fault, refer
to the interpretation of
this command.
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 1In the event of a fault, refer
to the interpretation of
this command.
AC251 Heating resistor
relay 2In the event of a fault, refer
to the interpretation of
this command.
USER SELECTIONUCH (see 87B,
Passenger
compartment
connection unit)AC015 Air conditioning
button indicator lightIn the event of a fault, refer
to the interpretation of
this command.
AC019 Heated rear
screen indicator lightIn the event of a fault, refer
to the interpretation of
this command.

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MANUAL AIR CONDITIONING
Fault finding - Customer complaints
NOTESSpecial notes:
This section corresponds to the list of possible customer complaints.
AIR DISTRIBUTION PROBLEM
AIR DISTRIBUTION PROBLEM ALP 2
AIR FLOW FAULT ALP 3
INEFFICIENT WINDSCREEN DEMISTING ALP 4
NO PASSENGER COMPARTMENT VENTILATION ALP 5
HEATING FAULT
NO HEATING OR LOSS OF HEATING (section 61A) ALP 6
TOO MUCH HEATING (section 61A) ALP 7
AIR CONDITIONING FAULT
NO COLD AIR ALP 8
TOO MUCH COLD AIR ALP 9
INEFFICIENT REAR SCREEN DE-ICING/DEMISTING ALP 10
PASSENGER COMPARTMENT ODOURS
UNPLEASANT ODOURS IN PASSENGER COMPARTMENT ALP 11
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MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 4
CONTINUED
Check that the condensation evacuation port (water from the evaporator) is not blocked.
Repair if necessary.
Is there an air distribution fault?
NO
Is there an air flow fault?
NO
Is there a heater performance fault?
NO
Check that the recirculation flap is in the external air position.
Repair if necessary (see MR 411 Mechanical, 61A, Heating, Recirculation control cable: Removal -
Refitting).
YESSee ALP 2.
YESSee ALP 3.
YESSee 61A, Heating, Fault finding chart,
ALP 6: No heating or loss of heating.
AFTER REPAIRCarry out a complete check with the diagnostic tool.

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MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 5 No passenger compartment ventilation
NOTESCheck that fuse F28 (30A) is in good condition.
Check that the air circuit (cabin filter, scuttle panel grille, air ducts etc.) is not blocked.
Is the air circuit in good condition?
YES
Check the condition of the passenger compartment blower blades.
Are the passenger compartment blower blades in good condition?
YES
Check that the air recirculation flap does not remain
closed when in the recirculation position.
Repair if necessary.
Is the fault still present when the air distribution is
changed?
NO
NO
If necessary, repair, clean or replace the
cabin filter (see MR 411 Mechanical, 61A,
Heating, Cabin filter: Removal -
Refitting).
NO
If necessary, repair, clean or replace the
passenger compartment blower blades
(see MR 411 Mechanical, 61A, Heating,
Fan assembly: Removal - Refitting).
YESEnsure that all the air vents are open.
If the fault is still present (see ALP2 Air
distribution fault).
AFTER REPAIRCarry out a complete check with the diagnostic tool.

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MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 5
CONTINUED 3
Disconnect the connector of component 1156, position the speed switch in position V4.
Using a test light, check for + 12 V between connections 38DA and 38DB of component 1156.
Does the test light illuminate?
YES NO
Replace fan assembly 1 (see MR 411 Mechanical,
61A, Heating, Fan assembly control unit:
Removal - Refitting).
Is the continuity correct?
YES NO
Carry out a continuity test on connection 38DB
between components 1156 and 164.
Is the continuity correct?
YES NO
End of procedure. Fault on connection 38DB between components 1156
and 164. Repair the wiring. If there is a repair
procedure (see Technical Note 6015A, Repairing
electrical wiring, Wiring: Precautions for repair),
repair the wiring, otherwise replace it.
Carry out a continuity test on connection 38DA
between components 1156 and 164.
Fault on connection 38DA between components 1156
and 164. Repair the wiring. If there is a repair
procedure (see Technical Note 6015A, Repairing
electrical wiring, Wiring: Precautions for repair),
repair the wiring, otherwise replace it.
AFTER REPAIRCarry out a complete check with the diagnostic tool.

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Fault finding - Fault finding charts62C
ALP 8
CONTINUED 1
1
Using the diagnostic tool statuses and parameters
screen (UCH heating sub-function), check that the
temperature signals are consistent (no sensor
deviations resulting in incorrect measurement).
–Use statuses PR002 Exterior temperature and
PR024 Engine coolant 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).
2
Display the following status in the “User selection”
sub-function screen:
ET029 Air conditioning button should be
PRESSED.
Note:
The status indicates if the signal for the AC button
pressed on the control panel is read by the UCH
correctly.
Does status ET029 display PRESSED?
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.
Replace any faulty components.
NOContinuity fault on connection 38LP.
Using an ohmmeter, carry out a continuity
test on connection 38LP between
components 319 and 645. If there is a
procedure (see Technical Note 6015A,
Repairing electrical wiring, Wiring:
Precautions for repair), repair the wiring,
otherwise replace the wiring.
AFTER REPAIRCarry out a complete check with the diagnostic tool.

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Fault finding - Fault finding charts62C
ALP 8
CONTINUED 7
2
With the engine warm and passenger compartment
ventilation operating, vary the position of the mixing
flap from the maximum hot position to the maximum
cold position and check subjectively that there is a
difference in temperature.
Is a difference in temperature noted?
YES
E
NOCheck 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
End of fault finding
procedure.
Check the cold loop by checking the condition of the pipes and ensuring that the air conditioning system does not
have any refrigerant leaks (see Technical Note 6001A, Air conditioning, 62A, Air conditioning, Air
conditioning: Check). Repair the faulty pipes or components.
Top up the refrigerant (see MR 411 Mechanical, 62A, Air conditioning, Refrigerant circuit: Draining - Filling).
Is the fault still present?
NO YES
End of fault finding procedure. Replace the air conditioning compressor.
AFTER REPAIRCarry out a complete check with the diagnostic tool.

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MANUAL AIR CONDITIONING
Fault finding - Fault finding charts
ALP 9 Too much cold air
NOTESConsult this customer complaint after a full check with the diagnostic tool (fault reading and
configuration checks).
Check that the fuses are sound.
Use a multimeter and a 21 W test light.
Use the Wiring Diagram Technical Note, New Twingo.
With the engine at idle speed and the heating and air conditioning off (AC button not pressed), check that the air conditioning
compressor clutch is not engaged.
Is the air conditioning compressor clutch engaged? NO
YES
With the engine stopped, check that the compressor clutch electric control operates correctly, using the diagnostic tool to run
command AC180 Air conditioning compressor relay (injection command mode menu).
–During the command, connection 38R of component 171 must be supplied with + 12 V.
–After the command, connection 38R of component 171 must no longer be supplied with + 12 V.
Is the connection still supplied with + 12 V after the command?
YES NO
Check the continuity and insulation from + 12 V of
connection 38R between components 171 and 584.Check that the air conditioning compressor clutch is not
jammed (mechanical fault).
Is the connection OK? Is the clutch still engaged?
NO YES YES
If there is a repair procedure (see
Technical Note 6015A, Repairing
electrical wiring, W iring:
Precautions for repair), repair the
wiring, otherwise replace it.With the vehicle ignition of f, check that
the compressor clutch relay is not
“jammed”, by checking the continuity
between connection 38R and
connection AP3 of component 584.
Is the continuity present?
NO

Apply the fault finding procedure for command
AC180 Air conditioning compressor relay
(see 13B Diesel injection or 17B Petrol
injection).
Is the fault still present?
Replace the air conditioning
compressor (see MR 411,
Mechanical, 62A, Air conditioning,
Compressor: Removal - Refitting).
YESReplace the air
conditioning
compressor clutch
relay.
AFTER REPAIRCarry out a complete check with the diagnostic tool.
MR-413-X44-62C000$910_eng.mif