2009 RENAULT TWINGO Heating And Air Conditioning - Heating Workshop Manual

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Fault finding - Conformity check61A
SUMMARY TABLE OF THE VARIOUS AIR CONDITIONING COMPUTER COMMANDS
Name of sub-function Name of computer Command name Fault finding
HEATINGUCH (see 87B,
Passenger
compartment
connection unit)AC060 Rear screen
de-icerIn the event of a fault, refer
to the interpretation of
this command.
Injection (see 13B, Diesel
injection or 17B, Petrol
injection)AC250 Heating resistor
relay 1 (depending on
version)In the event of a fault, refer
to the interpretation of
this command.
AC251 Heating resistor
relay 2 (depending on
version)In the event of a fault, refer
to the interpretation of
this command.
USER SELECTIONUCH (see 87B,
Passenger
compartment
connection unit)AC019 Heated rear
screen indicator lightIn the event of a fault, refer
to the interpretation of
this command.

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Fault finding - Customer complaints
NOTESSpecial notes:
This section gives the list of possible customer complaints (Fault finding charts can be
found in sections 61A, 62B and 62C: see below).
AIR DISTRIBUTION FAULT (SECTION 62C)
AIR DISTRIBUTION PROBLEM ALP 2
AIR FLOW FAULT ALP 3
INEFFICIENT WINDSCREEN DEMISTING ALP 4
NO PASSENGER COMPARTMENT VENTILATION ALP 5
HEATING FAULT
NO HEATING OR INADEQUATE HEATING ALP 6
EXCESSIVE HEATING ALP 7
INEFFICIENT REAR SCREEN DE-ICING/DEMISTING (SECTION 62C) ALP 10
WATER PRESENT IN THE PASSENGER COMPARTMENT
(SECTION 62C OR 62B)ALP 12
CONTROL PANEL FAULT (SECTION 62C)
NO CONTROL PANEL LIGHTING ALP 13
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Fault finding - Fault finding charts
ALP 6 No heating or inadequate heating
NOTESCarry out these checks after a full check using the diagnostic tool (fault reading and
configuration checks).
Check that the fuses are sound.
Use a multimeter, current clamp and 21 W test light.
Use the Wiring Diagrams Technical Note, NEW TWINGO.
Is the air flow correct?
YES
Is the air distribution correct?
YES
With a warm engine, set the heating to max.
Is the blown air hot?
NO
Using the parameter and statuses screen on the
diagnostic tool (Heating and UCH or Climate
Control sub-functions: 62B), check that the
temperature signals are consistent (no sensor
deviation resulting in incorrect measurement).
For manual air conditioning systems:
–Use parameters PR002 Exterior temperature
(depending on option) and PR024 Engine
coolant temperature.
For climate control systems:
–Use parameters PR002 Exterior
temperature, PR004 Coolant temperature
and PR001 Interior temperature.
Are the temperature signals consistent?
YES
NOSee ALP3 Air flow fault, air flow fault.
NOSee ALP2 Air distribution fault, air
distribution fault.
YESIf necessary, explain how the system works to
the customer again.
Carry 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.
NO
A
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CONTINUED 1
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
dif ference in temperature.
Is a difference in temperature
noted?
YES
NO
For climate control systems:
Carry 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.).
For manual air conditioning and heater versions:
Check 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
Is the lower heater matrix pipe (coolant inlet) hot?
Note: Pipe located on the left-hand side of the
heater-air conditioning unit, near the engine bulkhead.
YES NO
End of fault finding
procedure.
Check that the heater matrix is not blocked: the top
heater matrix outlet pipe should be hot. Clean the
heater matrix or replace it if necessary (see MR 411,
Mechanical, 61A, Heating, Heater matrix: Removal
- Refitting).
Is the fault still present?
NO
Check the coolant circuit:
Check the level of the coolant circuit (too low a level
may unprime the circuit when driving at low loads and
when idling).
Check that the thermostatic valve opens at the
correct temperature, and replace the valve if
necessary (see MR 411, Mechanical, 19A, cooling,
thermostat:
Removal - Refitting).
End of fault finding
procedure.
A
B

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ALP 6
CONTINUED 2
Note:
Fault finding procedure performed using a current clamp.
For diesel vehicles equipped with Passenger compartment heating resistors and climate control, check that
the climate control computer is correctly configured by reading the following configuration (reconfigure the
computer if necessary):
–For the climate control computer, parameter LC044 Heating resistor type should display 900 W.
With the passenger compartment fan activated, fit a current clamp to the connection of earth between the battery
and chassis earth point, and use the CLIP tool to run command AC250 Heating resistor relay 1.
Does the current measured increase by at least 20 A when the command is run?
YES NO
Connect a test light between connection 38LL of
component 1113 and the chassis earth and run
command AC250 Heating resistor relay 1.
Does the test light illuminate?
NO YES
Disconnect the passenger compartment heating resistor connector
(component 1113) and connect a test light between connections 38LL and MAK
and run command AC250 Heating resistor relay 1.
Does the test light illuminate?
NO YES
Replace the passenger compartment heating
resistor unit (component 1113) (see MR 411,
Mechanical, 61A, Heating, Heating
resistors: Removal - Refitting).
Earth fault on component 1113. If there is a repair method (see Technical Note
6015A, Repairing electrical wiring, W iring: Precautions for repair), repair or
replace the wiring.
B
C
D

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ALP 6
CONTINUED 3
Note:
Fault finding procedure performed using a current clamp.
With the passenger compartment fan activated, fit a current clamp to the connection of earth between the battery
and chassis earth point, and use the CLIP tool to run command AC251 Heating resistor relay 2.
Does the current measured increase by at least 40 A when the command is run?
YES NO
With the passenger
compartment heating
resistors operating, carry
out a conformity check on
the injection, heating sub-
function (see 13B, Diesel
injection, Conformity
check).
Disconnect the passenger compartment heating resistor connector
(component 1113) and connect a test light between each of the connections
38LM and MAK and run command AC251 Heating resistor relay 2.
Does the test light illuminate?
NO YES
Replace the passenger compartment
heating resistor unit (component 1113)
(see MR 411, Mechanical, 61A, Heating,
Heating resistors: Removal - Refitting).Check the continuity of the 2 connections 38LM between
components 1113 and 1068.
Is the continuity correct?
NO YES
Continuity fault on
connection 38LM. If there
is a repair method
(see Technical Note
6015A, Repairing
electrical wiring, Wiring:
Precautions for repair),
repair or replace the
wiring.Re-run command AC251 Heating resistor relay 2. Check for + 12 V supply
on connections 3FB and BP9 of component 1068.
Are the supplies correct?
YES NO
Check the engine fuse
and relay box (see 16A,
Starting Charging).Run fault finding on the injection computer
for the heating element resistor 2 command
(see 13B, Diesel injection, Conformity
check).
C

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CONTINUED 4
Note:
Fault finding procedure performed using a current clamp.
Check the continuity on connection 38LL
between components 1113 and 1067.
Is the continuity correct?
YES
Re-run command AC250 Heating resistor
relay 1. Check for + 12 V between the chassis
earth and connections 3FB and BP9 of
component 1067.
Is there + 12 V?
YES
Run fault finding on the injection computer for
the heating element resistor 1 command
(see 13B, Diesel injection, Conformity check).
NOContinuity fault on connection 38LL. If there is
a repair procedure (see Technical Note
6015A, Repairing electrical wiring, Wiring:
Precautions for repair), repair the wiring or
replace it
.
NOCheck the engine fuse and relay box
(see 16A, Starting Charging).
D

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ALP 6
CONTINUED 5
Note:
Fault finding procedure without using a current clamp.
For vehicles equipped with Passenger compartment heating resistors and climate control, check that the
climate control computer is correctly configured by reading the following configurations (reconfigure the computer
if necessary):
–For the climate control computer, parameter LC044 Heating resistor type should display 900 W.
Disconnect the passenger compartment heating resistor connector (component 1113) and connect a test light
between connections 38LL and MAK and run command AC250 Heating resistor relay 1.
Does the test light illuminate?
YES NO
Replace the passenger
compartment heating resistor unit if,
at ambient temperature, the
resistance value between
connections 38LL and MAK of
component 1113, is not between:
0.55 and 0.75 ΩΩ Ω Ω
(see MR 411,
Mechanical, 61A, Heating,
Heating resistors:
Removal - Refitting).
Connect a test light between connections 38LL of component 1113
and the chassis earth and run command AC250 Heating resistor
relay 1.
Does the test bulb illuminate?
NO YES
Earth fault on component
1113. If there is a repair
method (see Technical Note
6015A, Repairing electrical
wiring, Wiring: Precautions
for repair), repair or replace
the wiring.
B
Check the continuity on
connection 38LL between
components 1113 and 1067.
Is the continuity correct?
NO YES
Continuity fault on connection 38LL. If there is a repair
method (see Technical Note 6015A, Repairing
electrical wiring, Wiring: Precautions for repair), repair
or replace the wiring.D
C