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

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62C
MANUAL AIR CONDITIONING
Fault finding - Introduction
1. SCOPE OF THIS DOCUMENT
This document presents the fault finding procedure applicable to all computers with the following specifications:
2. PREREQUISITES FOR FAULT FINDING
Documentation type
Fault finding procedures (this document and the Technical Notes concerning the injection system
fitted to the vehicle, and the UCH):
–Assisted fault finding (integrated into the diagnostic tool), Dialogys.
Wiring Diagrams:
–Visu Schéma (CD-ROM), paper.
Type of diagnostic tools
–CLIP + multiplex line sensor
Special tooling required
3. REMINDERS
Procedure
To run fault finding on the vehicle computers, proceed as follows:
–turn the ignition key to APC,
–Connect the diagnostic tool and carry out the required operations,
To cut off the + after ignition feed, proceed as follows:
–disconnect the diagnostic tool,
–turn the ignition key to OFF,
–switch off the ignition. Vehicle(s): New Twingo
Function concerned: Manual air conditioning
Special tooling required
Multimeter
Elé. 1681 Universal bornier
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Fault finding - Introduction62C
Faults
Faults are declared as either present or stored (depending on whether they appeared in a certain context and have
disappeared since, or whether they remain present but have not been diagnosed within the current context).
The present or stored status of faults should be taken into consideration when the diagnostic tool is switched on
after the + after ignition feed (without any system components being active).
For a present fault, apply the procedure described in the Interpretation of faults section.
For a stored fault, note the faults displayed and apply the instructions in the Notes section.
If the fault is confirmed when the instructions in the Notes section are applied, the fault is present. Deal with the fault
If the fault is not confirmed, check:
–the electrical lines which correspond to the fault,
–the connectors on these lines (corrosion, bent pins, etc.),
–the resistance of the component detected as faulty,
–the condition of the wires (melted or split insulation, wear).
Conformity check
The aim of the conformity check is to check data that does not produce a fault on the diagnostic tool because the
data is inconsistent. Therefore, this stage is used to:
–carry out fault finding on faults that do not have a fault display, and which may correspond to a customer
complaint.
–check that the system is operating correctly and that there is no risk of a fault recurring after repairs.
This section gives the fault finding procedures for statuses and parameters and the conditions for checking them.
If a status is not behaving normally or a parameter is outside the permitted tolerance values, consult the
corresponding fault finding page.
Special notes regarding conformity checks for the air conditioning system:
The air conditioning system conformity check is divided into four parts. The parts relate to the four sub-functions of
the air conditioning system: heating, cold loop, user selection and passenger compartment ventilation. The statuses
and parameters related to these sub-functions are listed with their respective computers.
Special notes: The air conditioning control panel does not control electrical components (other than the passenger
compartment fan assembly) and it cannot support fault finding.
Customer complaints - Fault finding chart
If the test with the diagnostic tool is OK but the customer complaint is still present, the fault should be processed by
customer complaint. Note:
The interpretation of statuses, parameters and commands is also split into several sections. Everything controlled
by the air conditioning control panel is explained in the two Air conditioning sections (62B and 62C). On the
other hand, signals from other computers are explained in the fault finding sections for these computers (see
conformity check).
A summary of the overall procedure to follow is provided on the following page in the
form of a flow chart.

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Fault finding - Conformity check
SUB-FUNCTION: COLD LOOP
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Application conditions: engine stopped, ignition on, AIR CONDITIONING
SWITCHED OFF (Passenger compartment blower unit switched off and air
conditioning compressor not activated).
Note:
Read the parameters when the vehicle is cold (in the morning) to check the conformity
of the temperature parameters (without thermometer). The temperatures should be
approximately equal (interior, exterior and engine coolant).
ComputerParameter or Status
checked or ActionDisplay and Notes Fault finding
UCH (see 87B,
Passenger
compartment
connection unit)PR002: Exterior
temperature
(depending on
the version)X = exterior temperature
± 5 ˚C (invalid value:
215 ˚C)In the event of a fault, see the
interpretation of this
parameter.
ET030: Air conditioning
request 2INACTIVE In the event of a fault, refer to the
interpretation of this status.
Note:
This status represents the
request from the UCH to the
injection computer to activate the
compressor.
ET015: Passenger
compartment
blowerINACTIVE
(according to test
conditions: see Notes).In the event of a fault, refer to the
interpretation of this status.
PR025: Engine speed0 rpmIn the event of a fault, see the
interpretation of this
parameter.
ET142: Engine
operating phaseSTOPPEDIn the event of a fault, refer to the
interpretation of this status.
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Fault finding - Conformity check62C
COLD LOOP SUB-SYSTEM (CONTINUED 1)
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Application conditions: engine stopped, ignition on, AIR CONDITIONING
SWITCHED OFF (Passenger compartment blower unit switched off and air
conditioning compressor not activated).
Note:
Read the parameters when the vehicle is cold (in the morning) to check the conformity
of the temperature parameters (without thermometer). The temperatures should be
approximately equal (interior, exterior and engine coolant).
ComputerParameter or Status
checked or ActionDisplay and Notes Fault finding
Injection
(see 13B, Diesel
injection or 17B,
Petrol injection)ET079:Air conditioning
presentYES
(automatic injection
computer configuration)If the status displays NO, refer
to the interpretation of this
status.
ET088:Compressor
actuation
requestINACTIVEIf the status displays ACTIVE,
refer to the interpretation of this
status.
ET004:Air conditioning
authorisationNO
(no authorisation with
engine stopped)In the event of a fault, refer to the
interpretation of this status.
PR037:Refrigerant
pressure 1 bar < X < 15 barIn the event of a fault, see the
interpretation of this
parameter.
PR055:Engine speed0 rpmIn the event of a fault, see the
interpretation of this
parameter.
ET023:Fast idle speed
requestABSENTIn the event of a fault, refer to the
interpretation of this status.

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Fault finding - Conformity check62C
SUB-FUNCTION: COLD LOOP (CONTINUED 2)
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Application conditions: engine stopped, ignition on, AIR CONDITIONING
SWITCHED OFF (Passenger compartment blower unit switched off and air
conditioning compressor not activated).
Note:
Read the parameters when the vehicle is cold (in the morning) to check the conformity
of the temperature parameters (without thermometer). The temperatures should be
approximately equal (interior, exterior and engine coolant).
ComputerParameter or Status
checked or ActionDisplay and Notes Fault finding
Injection
(continued)PR064:Coolant
temperatureX = engine coolant
temperatureIn the event of a fault, see the
interpretation of this
parameter.
PR089:Vehicle speed0 mphIn the event of a fault, see the
interpretation of this
parameter.
PR125:Power absorbed
by the air
conditioning
compressor0 W (ambient
temperature 23 ˚C)In the event of a fault, see the
interpretation of this
parameter.
ET022:Low speed fan
assembly
requestINACTIVEIn the event of a fault, refer to the
interpretation of this status.
ET021:High speed fan
assembly
requestINACTIVEIn the event of a fault, refer to the
interpretation of this status.

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Fault finding - Conformity check62C
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 stopped, ignition on, AIR CONDITIONING
SWITCHED OFF (Passenger compartment blower unit switched off and air
conditioning compressor not activated).
ComputerParameter or Status
checked or ActionDisplay and Notes Fault 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.
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).
PR002:Exterior
temperature
(depending on
the version)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 ˚C.If there is a fault, refer to 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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Fault finding - Conformity check62C
SUB-FUNCTION: HEATING (CONTINUED)
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Application conditions: engine stopped, ignition on, AIR CONDITIONING
SWITCHED OFF (Passenger compartment blower unit switched off and air
conditioning compressor not activated).
ComputerParameter or Status
checked or ActionDisplay and Notes Fault finding
Injection (see 13B,
Diesel injection or
17B, Petrol
injection)PR064:Coolant
temperatureX = engine coolant
temperatureIf there is a fault, refer to the
interpretation of this
parameter
ET111:RCH number setNO
Note: Depending on the
requirements of the
injection system (power
requirement, torque
reduction, etc.), the
injection computer sets
the controlled
passenger compartment
heating resistor stage
number (no more, no
less)In the event of a fault, refer to the
interpretation of this status.
ET112:Passenger
compartment
heating resistor
cut-offYESIn the event of a fault, refer to the
interpretation of this status.

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Fault finding - Conformity check62C
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 stopped, ignition on, AIR CONDITIONING
SWITCHED OFF (Passenger compartment blower unit switched off and air
conditioning compressor not activated).
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.
ET029:Air conditioning
buttonPRESSED if the AC
button 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
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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Fault finding - Conformity check62C
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, AIR CONDITIONING OPERATING
(air conditioning compressor engaged).
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).
PR002:Exterior
temperature
(depending on
the version)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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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.
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