2009 RENAULT TWINGO RS engine

62B-88
MR-413-X44-62B000$874_eng.mif
V1

Vdiag No.: 44CLIMATE CONTROL
Diagnostic - Fault finding chart62B
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 (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
Check the refrigerant fluid (see Technical Note
6001A, Air conditioning, 62A, Air conditioning,
Air conditioning: Check).
NOCarry 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.).
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.
AFTER REPAIRCarry out a complete check with the diagnostic tool.

62B-89
MR-413-X44-62B000$920_eng.mif
V1
62B
CLIMATE CONTROL
Diagnostic - Fault finding chart
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 control is activated by pressing the de-icing button at the
bottom of the climate control panel in manual mode (with time delay and rear-view
mirror de-icer).
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 is correctly configured by viewing the configuration reading LC013 Type of air conditioning.
Reconfigure the UCH if necessary.
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.

Vdiag No.: 44
MR-413-X44-62B000$920_eng.mif

62B-91
MR-413-X44-62B000$920_eng.mif
V1

Vdiag No.: 44CLIMATE CONTROL
Diagnostic - Fault finding chart62B
ALP 11 Unpleasant odours in the passenger compartment
NOTESOnly consult this customer complaint after a complete check with the diagnostic
tool.
Check that the cabin filter is not blocked or damaged
(see MR 411 Mechanical, 61A, Heating, Cabin filter:
Removal - refitting).
Replace it if necessary.
Is the fault still present?
YES
Check that the condensate (water from the evaporator)
drain ring is not obstructed (beneath the body).
Repair if necessary.
Is the fault still present?
YES
Check the sealing of 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 passenger compartment filter to apply air
conditioning system cleaner using an extension piece 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.
CLIM_V44_ALP11

62B-95
MR-413-X44-62B000$920_eng.mif
V1
CLIMATE CONTROL
Diagnostic - Fault finding chart

Vdiag No.: 44
62B
ALP 14 Noisy compressor
NOTESOnly deal with 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, UCH
and climate control) 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.

62B-96
MR-413-X44-62B000$966_eng.mif
V1
62B
CLIMATE CONTROL
Fault finding - Help
MEASURING THE CONTROL VOLTAGE OF THE PASSENGER COMPARTMENT FAN UNIT POWER MODULE
There are two ways to measure the control voltage of the passenger compartment blower power module:
1 / MEASURING USING A MULTIMETER (in the voltmeter position, direct current measurement):
This voltage measurement only gives an indication (average of non-representative voltages) and is not a rigourous
method. However, this method can be used if no oscilloscope is available or simply as a guide value.
With the power module connector disconnected, measure between connection 38LR of component 1023 and the
earth MAN.
At speed 0 the voltage measured is equal to the battery voltage (± 1 V) and at speed 8 the voltage is 0 V (± 0.5 V).
For the seven intermediate speeds, the voltage varies between 0 and the battery voltage.
Examples of measurements taken with the voltmeter with the engine at idle speed (values given as a guide):
Note:
These values are given for a battery voltage of + 12 V.
2 / MEASURING USING AN OSCILLOSCOPE (Optima 5800, CLIP technique):
The fan assembly power module is controlled by pulse width modulated control voltage (PWM*). This control voltage
is always 12 V, it is the control signal (square signal) that varies:
The amplitude and frequency do not vary but instead the high status (12 V) varies in relation to the low status (0 V).
To make this measurement, connect the oscilloscope earth lead to the battery earth and the oscilloscope measuring
lead to connection 38LR of component 1023 (power module connector connected).
Adjust the oscilloscope's time base to 500 µs per division with a range of 5 V per division and set the oscilloscope to
the Auto position by selecting the Trigger mode.
The signals obtained must be:
–a straight line at 12 V (±1) for speed 0,
–a straight line at 0 V (± 0.5 V) for speed 8. Passenger compartment
blower speed01 23 45 67 8
Voltage measurement
in V at the PWM* terminals11.73 V 9.5 V 9 V 8.3 V 7.2 V 6.6 V 5.4 V 3.6 V 0.4 V
Voltage measurement
in V at the fan assembly
terminals02.53.24.3 5.6 6.6 8 10 12
PR019 Passenger
compartment blower
PWM* setting0 % 20 % 25 % 33 % 43 % 50 % 60 % 77 % 100 %

Vdiag No.: 44
MR-413-X44-62B000$966_eng.mif

62B-97
MR-413-X44-62B000$966_eng.mif
V1
CLIMATE CONTROL
Fault finding - Help

Vdiag No.: 44
62B
Examples of measurements taken using the oscilloscope with the engine at idle speed (given as a guide):
* Passenger compartment blower unit PWM voltage of the modulated control for the passenger compartment
blower unit.Passenger compartment
blower speed01 23 45 67 8
Duration of high status 450 µs 400 µs 350 µs 300 µs 250 µs 200 µs 150 µs
Duration of low status 50 µs 100 µs 150 µs 200 µs 250 µs 300 µs 350 µs
PR019 Passenger
compartment blower
PWM* setting0 % 20 % 25 % 33 % 43 % 50 % 60 % 77 % 100 %

62B-99
MR-413-X44-62B000$966_eng.mif
V1
CLIMATE CONTROL
Fault finding - Help

Vdiag No.: 44
62B
OPERATION OF THE ENGINE COOLING FAN ASSEMBLY AS A FUNCTION OF THE REFRIGERANT FLUID
PRESSURE AND VEHICLE SPEED
Relative pressure (bar)
GMV = 1 Low-speed engine cooling fan
GMV = 2 High-speed engine cooling fan
GMV = 0 Engine cooling fan stopped
The engine cooling fan assembly is not used for vehicle speeds in excess of 70 km/h, except in rare cases where
the refrigerant fluid pressure is greater than 23 bar despite the high speed (e.g. driving behind a lorry).
When the vehicle is stationary, the engine cooling fan is always used at low speed if the refrigerant fluid relative
pressure is below 19 bar, otherwise it is used at high speed.
While the vehicle is being driven, the engine cooling fan may either not operate, or operate at low or high speed
depending on the refrigerant fluid pressure at the condenser outlet and the vehicle speed.27
23
19
11
1
0AIR CONDITIONING INHIBITION
GMV = 2
GMV = 2 GMV = 1 GMV = 0
GMV = 1 GMV = 0
GMV = 1 GMV = 0
AIR CONDITIONING INHIBITION
20 30 45 70Vehicle speed in mph