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MANUAL AIR CONDITIONING
Fault finding - Function62C
Exchanges between the two air conditioning computers (manual air conditioning)
–air conditioning request
–switch on heated rear screen request (+ electric door mirrors)
–passenger compartment ventilation signal
MANUAL AIR
CONDITIONING
CONTROL PANELUCH
–Heated rear screen warning light lit
–Air conditioning warning light lit
–Air conditioning request 2
UCHINJECTION
COMPUTER
–Air conditioning authorisation
–Engine status signal
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V1
MANUAL AIR CONDITIONING
Fault finding - Function62C
Vehicle
multiplex
network
Heated rear screen
resistor relay
Summary of components controlled or managed by the MANUAL AIR CONDITIONING control panel:
Ventilation and air conditioning unit
Passenger
compartment
blower
Resistor
unitRecirculation
flapDistribution
flapMixing
flap
Actuator control
User control panel
User request management
(air conditioning button and
heated rear screen button
pressed)Button lighting (air conditioning
button and heated rear screen
button)Passenger compartment
blower operation signal
(running or stopped)
UCH
Transmission of air conditioning
request
Activation of the heated rear
screen request.
Key:
Wire connections =
Multiplex connections =
Mechanical connections =
(control cables)
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MANUAL AIR CONDITIONING
Fault finding - Function62C
Vehicle
multiplex
network
Summary diagram of components controlled or managed by the UCH:
Summary diagram of components controlled or managed by the injection computer Rear screen de-icing and
rear-view mirror de-icer
(depending on version)External temperature
sensor
(depending on
version)
Actuator control Sensor management
UCH
Air conditioning request
managementHeated rear screen control
management
Relay No. 1 for
the Passenger
Compartment
Heating
ResistorsRelay No. 2 for
the Passenger
Compartment
Heating
ResistorsAir conditioning
compressorEngine cooling
fan assemblyEngine
coolant
temperature
sensorRefrigerant
fluid
pressure
sensor
Actuator control Sensor management
Engine injection computer
Management of the cold loop (refrigerant pressure, engine cooling fan activation request,
compressor activation authorisation, etc.)
Key:
Wire connections =
Multiplex connections =
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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
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62C-21
MR-413-X44-62C000$546_eng.mif
V1
62C
MANUAL AIR CONDITIONING
Diagnostics - Configuration and programming
Air conditioning system configurations
Air conditioning system configuration readingsComputers Configuration Option Comments
UCHCF019: Type of air
conditioning– Heating
– Manual
– Climate control
CF029: Exterior
temperature
sensor–With
–None
INJECTION (all types) X XAutomatic computer
configuration
Computers Configuration readings Option Comments
UCHLC013: Type of air
conditioning– Climate control
– Manual air
conditioning
– Heating
None
LC002: External
temperature
sensor– With
– None
MR-413-X44-62C000$546_eng.mif
Page 22 of 63
62C-22
MR-413-X44-62C000$637_eng.mif
V1
62C
MANUAL AIR CONDITIONING
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.
MR-413-X44-62C000$637_eng.mif
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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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MANUAL AIR CONDITIONING
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.
