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

62C-5
MR-413-X44-62C000$091_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Introduction62C
4. FAULT FINDING PROCEDURE (CONTINUED)
Wiring check
Fault finding problems
Disconnecting the connectors and/or manipulating the wiring harness may temporarily remove the cause of a fault.
Electrical measurements of voltage, resistance and insulation are generally correct, especially if the fault is not
present when the analysis is made (stored fault).
Visual inspection of the connection:
●Check that the connector is connected correctly and that the male and female parts of the connection are
correctly coupled.
Visual inspection of the area around the connection:
●Check the condition of the mounting (pin, strap, adhesive tape, etc.) if the connectors are attached to the
vehicle.
●Check that there is no damage to the wiring trim (sheath, foam, adhesive tape, etc.) near the wiring.
●Check that there is no damage to the electrical wires at the connector outputs, in particular on the
insulating material (wear, cuts, burns, etc.).
Disconnect the connector to continue the checks.
Visual inspection of the plastic casing:
●Check that there is no mechanical damage (casing crushed, cracked, broken, etc.), in particular to the
fragile components (lever, lock, openings, etc.).
●Check that there is no heat damage (casing melted, darker, deformed, etc.).
●Check that there are no stains (grease, mud, liquid, etc.).
Visual inspection of the metal contacts:
(The female contact is called CLIP. The male contact is called TAB.)
●Check that there are no bent contacts (the contact is not inserted correctly and can come out of the back
of the connector). The spring contact of the connector when the wire is gently pulled.
●Check that there is no damage (folded tabs, clips open too wide, blackened or melted contact, etc.).
●Check that there is no oxidation on the metal contacts. Note:
Carry out each requested check visually. Do not remove a connector if it is not required.
Note:
Repeated connections and disconnections alter the functionality of the connectors and increase the risk of poor
electrical contact. Limit the number of connections/disconnections as much as possible.
Note:
The check is carried out on the 2 parts of the connection. There may be two types of connections:
–Connector / Connector
–Connector / Device

62C-20
MR-413-X44-62C000$455_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Function62C
ET004: AIR
CONDITIONING
AUTHORISED.
Special notes:
This flowchart shows the tracks of the
compressor engagement request.
Components which may block this
request are not listed (passenger
compartment blower operation signal
for the UCH on manual version with
AC, correct refrigerant pressure for
the injection, etc.).
If the compressor does not engage
(one of the requests is not
transmitted): carry out a conformity
check.
Compressor control flowchart:
ET029: AIR
CONDITIONING
BUTTON
ET030: AIR
CONDITIONING
REQUEST 2UCH
ET088: COMPRESSOR
ACTIVATION
REQUESTInjection computer
Air conditioning
Compressor
Key:
Multiplex signals
Wire connections

62C-37
MR-413-X44-62C000$819_eng.mif
V1
62C
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts
ALP 2 Air distribution fault
NOTESCheck that the air circuit (cabin filter, scuttle panel grille, air ducts etc.) is not blocked.
Make sure that the air circuit (cabin filter, scuttle panel grille, air ducts etc.) is not blocked.
Ensure that the passenger compartment blower is in good condition.
Repair, clean or change the cabin filter if necessary.
Ensure that the passenger compartment blower unit is properly sealed.
Repair if necessary.
Set the passenger compartment blower to maximum
speed with maximum hot or maximum cold and
move the temperature control.
Check that the blown air matches the request.
Is the air distribution correct?
NO
Remove the glovebox and the centre console in
order to visually check whether moving the control
causes the distribution flaps to move.
Is there movement?
NO
YESThe air distribution is operating correctly.
Explain to the customer how the system
operates.
YESCheck that the distribution flaps are in
good condition, the footwell distribution
flap linkages are in position, and that there
is no mechanical obstruction. If necessary,
repair or replace the air conditioning unit.
AFTER REPAIRCarry out a complete check with the diagnostic tool.
MR-413-X44-62C000$819_eng.mif

62C-39
MR-413-X44-62C000$819_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 3 Air flow fault
NOTES
Is the passenger compartment blower working?
Check all of the speeds: Does the flow vary in
accordance with the position of the speed switch?
YES
Make sure that the air circuit (cabin filter, scuttle panel grille, air ducts etc.) is not blocked.
Ensure that the passenger compartment blower is in good condition.
Clean or replace the cabin filter.
With the cabim filter removed, put your hand into the
housing to ensure that the evaporator is not
obstructed and that there is no ice.
Is the evaporator obstructed?
NO
Ensure that the passenger compartment blower unit is properly sealed. Also check that the air distribution ducts
(right-hand and left-hand, upper and lower) are correctly connected to the housing as well as the refrigeration pipe
in the glove box (if the customer complains about a feeling of cold air on the passenger's side).
Repair if necessary.
Check that the air recirculation flap does not remain closed when in the recirculation position.
Repair if necessary.
Does the fault disappear when the air distribution
is changed ?
NO
See ALP5.
AFTER REPAIRCarry out a complete check with the diagnostic tool.
NORepair, see ALP 5.
YESRemove the evaporator and clean if it is
blocked.
If there is ice on the evaporator, perform a
conformity check on the temperature
sensors (exterior and coolant
temperatures).
Replace any faulty components.
YESEnsure that all the air vents are open.
If the fault is still present, refer to ALP 2.

62C-40
MR-413-X44-62C000$819_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 4 Inefficient windscreen demisting
NOTESSpecial notes:
Check that the inside of the windows are not dirty, as this reduces the efficiency of
demisting.
Is the passenger compartment blower working?
YES
Check that the air extraction vents are not blocked.
Repair if necessary.
Is the fault still present?
YES
Ensure that there are no water leaks into the
passenger compartment which would significantly
increase the humidity and reduce the effectiveness
of the demisting.
Repair if necessary (see ALP 12).
Is the fault still present?
YES
Make sure that the compressor is operating
correctly by turning on the air conditioning.
Does the compressor work?
YES
NORepair, see ALP 5.
NOEnd of fault finding procedure.
NO
End of fault finding procedure.
NOSee, ALP8 No cold air
AFTER REPAIRCarry out a complete check with the diagnostic tool.

62C-41
MR-413-X44-62C000$819_eng.mif
V1
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.

62C-42
MR-413-X44-62C000$819_eng.mif
V1
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.

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-61
MR-413-X44-62C000$910_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 12 Water is present in the passenger compartment
NOTESNone.
Pressurise the cooling circuit.
Is there any coolant leaking into the vehicle?
NO
Check that the condensate drain pipe (water from
the evaporator) is not blocked.
Repair if necessary.
Is the fault still present?
YES
Make sure that the scuttle panel (under the windscreen aperture) is not filled with water.
If it is, check that the drain valve is fitted to the scuttle panel and is in good condition.
Replace the valve if necessary.
Has the customer just washed the vehicle?
YES
Explain to the customer that when washing the car
using a hose pipe, the water jet must not be left for
too long on the air inlet in the scuttle panel (on the
bonnet).
YES Repair.
NOEnd of fault finding procedure.
NO End of fault finding procedure.
AFTER REPAIRCarry out a complete check with the diagnostic tool.