engine RENAULT TWINGO RS 2009 2.G Heating And Air Conditioning - Manual Air Conditioning Owner's Manual

62C-51
MR-413-X44-62C000$819_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 8
CONTINUED 3
Carry out fault finding on the injection system to ensure that no fault is present (if faults are displayed by the
injection computer, engagement of the air conditioning may be inhibited). If there are present or stored faults,
carry out the necessary repairs (see 13B, Diesel injection or 17B, Petrol injection).
Check that the refrigerant fluid pressure is correct (neither too low nor too high) using the PR037 Refrigerant
fluid pressure parameter (see Conformity check, Cold loop sub-function).
Check that the engine cooling fan assembly is at
speed 1 by viewing the following status on the cold
loop sub-function screen:
–Status ET022 Low-speed fan assembly request
should display ACTIVE.
Note:
These statuses are not displayed by all types of
injection (see Conformity check, Cold loop sub-
function).
Does the engine cooling fan operate at low speed?
YES
NOUsing the diagnostic tool, run
command AC154 Low speed fan
assembly relay.
Does the engine cooling fan operate
at low speed?
NO YES
Connector of component 321 disconnected. Connect a
test light between connection 49L of component 321
and the chassis earth and run command AC154 Low
speed fan assembly relay.
Does the test light illuminate?
YES NO
Measure the resistance of component 321, between
connections 49L and 49B of component 321. If the
resistance measured is infinite, replace the fan assembly
resistor (component 321).
Carry out fault
finding on the
injection system
(sub-function: cold
loop and engine
cooling for low
speed fan assembly
activation).
D
AFTER REPAIRCarry out a complete check with the diagnostic tool.

62C-53
MR-413-X44-62C000$819_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 8
CONTINUED 5
Check the air conditioning compressor belt tension
(see Technical Note 3786A, Engine and
peripherals, 10A, Belt tension setting tool Hz
measurement: tension values).
Is the tension correct?
YES
With the engine stopped, use the diagnostic tool to
run command AC180 Air conditioning
compressor relay (injection command mode
menu).
Does the compressor clutch jam?
YES
E
NOReplace the belt (see MR 411
Mechanical, 11A, Top and front of
engine, Accessories belt:
Removal - Refitting).
NO
YESConnect a test light between connections 38R
and MAS of component 171 and run
command AC180 Air conditioning
compressor relay.
Does the test light illuminate?
NO
Connect a test light between connection 38R
of component 171 and the chassis earth, then
run command AC180 Air conditioning
compressor relay.
Does the test light illuminate?
YES
Earth fault on component 171.
If there is a repair procedure
(see Technical Note 6015A,
Repairing electrical wiring,
Wiring: Precautions for
repair), repair the wiring,
otherwise replace the wiring.
Check the condition of the
diode (component 322).
Replace the diode if it is faulty.
Replace the air conditioning
clutch (component 171) if
possible, otherwise replace
the compressor (see MR 411
Mechanical, 62A, Air
conditioning, Compressor:
Removal - Refitting).
NO
F

62C-55
MR-413-X44-62C000$819_eng.mif
V1
MANUAL AIR CONDITIONING
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.

62C-56
MR-413-X44-62C000$910_eng.mif
V1
62C
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

62C-57
MR-413-X44-62C000$910_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 9
CONTINUED
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 difference in temperature.
Is a difference in temperature noted?
YES
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 Coolant temperature.
Are the temperature signals consistent?
YES
Check the refrigerant fluid (see Technical Note
6001A, Air conditioning, 62A, Air conditioning,
Air conditioning: Check).
NOCheck the condition and routing of the
mixing flap control cable. Eliminate any
constraints on the cable: kinks, restricted
by plastic clips, etc. Replace it if
necessary. Unclip the cable from the side
of the 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 on the mixing flap (flap
jammed inside the unit, etc.).
Carry out any necessary repairs.
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.
AFTER REPAIRCarry out a complete check with the diagnostic tool.

62C-58
MR-413-X44-62C000$910_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 10 Inefficient rear screen de-icing/demisting
NOTESCarry out this conformity check after a full check using the diagnostic tool (fault
reading, especially UCH and injection faults 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.
Special notes:
Check that the inside of the windows are not greasy as this reduces the efficiency of
the de-icing.
Note:
The de-icing control is only authorised when the engine is running to save
power. The rear screen de-icer is controlled by pressing the rear screen de-icer
button (with time delay and rear-view mirror de-icer if fitted).
Ensure that there are no water leaks in the passenger compartment which would significantly increase the
moisture and reduce the effectiveness of the demisting function (see ALP 12 if the fault is noted).
Is the fault still present?
YES NO
Check that the UCH receives the signal about the
status and operation of the engine. In the Cold Loop
screen, status ET142 Engine operating phase
should display RUNNING.
Is status ET142 RUNNING?
YES
End of fault finding procedure.
NOCarry out fault finding on the UCH
(interpretation of status ET142) and on the
multiplex network.
AFTER REPAIRCarry out a complete check with the diagnostic tool.

62C-60
MR-413-X44-62C000$910_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 11 Unpleasant odours in the passenger compartment
NOTESNone.
Check that the cabin filter is not blocked or
damaged.
Is the fault still present?
YES
Check that the condensate drain pipe (water from
the evaporator) is not blocked.
Is the fault still present?
YES
Check that there are no leaks on the heating unit in
relation to the engine compartment:
- Foam seal on the heater matrix coolant pipes fitted
and in good condition.
- Rubber seal on the radiator tank fitted and in good
condition (seal under the bonnet separating the
engine compartment from the windscreen aperture).
- Drain valve on the radiator tank fitted and in good
condition.
Repair if necessary.
Is the fault still present?
YES
Remove the cabin filter to apply air conditioning
system cleaner using an extension pipe on the
evaporator.
Spray the entire contents of the aerosol.
Leave the product to work for 15 minutes.
NOEnd of fault finding procedure.
NOEnd of fault finding procedure.
NOEnd of fault finding procedure.
AFTER REPAIRCarry out a complete check with the diagnostic tool.

62C-63
MR-413-X44-62C000$910_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 14 Noisy compressor
NOTESConsult this customer complaint after a full check with the diagnostic tool (fault
reading and configuration checks).
WARNING
Check that the computers active in the AIR CONDITIONING function (Injection and
UCH) are correctly configured.
Note:
Before starting any work, check that the noise is indeed coming from the compressor.
Check that the compressor belt is in good condition and check its tension (for engines without automatic
tensioning) (see MR 411, Mechanical, 11A, Top and front of engine, Accessories belt: Removal - Refitting).
Check that the compressor is correctly fixed (see MR 411 Heating and air conditioning system, 62A, Air
conditioning, Compressor: Removal - Refitting).
Check the refrigerant fluid and look for any leaks. Significant loss of fluid causes the compressor to make noises.
(see Technical Note 6001A, Air conditioning, 62A, Air conditioning, Air conditioning: Check).
If the fault is still present, replace the air conditioning compressor (see MR 411, Mechanical, 62A, Air
conditioning, Compressor: Removal - Refitting).
AFTER REPAIRCarry out a complete check with the diagnostic tool.