2009 RENAULT TWINGO ignition

87B-2
MR-413-X44-87B000$048.mif
V5
87B
PASSENGER COMPARTMENT CONNECTION UNIT
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 manual):
–Assisted fault finding (integrated into the diagnostic tool),
–Dialogys.
Wiring Diagrams:
–Visu-Schéma (CD-ROM), paper.
Type of diagnostic tools
–CLIP
Special tooling required
3. REMINDER
To run fault finding on the vehicle computers, switch on the ignition.
To cut off the + after ignition feed, proceed as follows:Vehicle(s): New Twingo
Function concerned: Passenger compartment
connection unitName of computer: UCH
Vdiag No.: 44
Special tooling required
Multimeter
Elé. 1681 Universal bornier
–Switch on the ignition with the key.
–Connect the diagnostic tool and perform the required operations.
–Switch off the ignition with the key.
–Disconnect the diagnostic tool.
–Switch off the ignition.
UCH_V44_PRELI
MR-413-X44-87B000$048.mif
UCH
Vdiag No.: 44

87B-3
MR-413-X44-87B000$048.mif
V5
UCH
Vdiag No.: 44PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Introduction87B
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 used following
the + after ignition supply being switched on (without operating the system components).
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 for these lines (for oxidation, 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.
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 dealt with by
Customer complaints.
A summary of the overall procedure to follow is provided on the following page in the
form of a flow chart.

87B-10
MR-413-X44-87B000$192.mif
V5
UCH
Vdiag No.: 44PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Role of components87B
–Energy management function
Role of BSS connection:
This bidirectional connection located between the UCH and the alternator circulates the following signals:
–Signals sent by the alternator: rotor current value, alternator charge value and electrical, thermal and
mechanical fault statuses.
–Signals sent by the UCH to the alternator: voltage setpoint, rail setpoint and rail inhibition.
Role of the DF terminal:
The signal circulating in the DF terminal is the alternator charge signal (displayed using PR073 "Alternator
charge signal") which is used to adapt the alternator supply to the demands of the electrical consumers
(such as the passenger compartment heating resistors, heated rear screen, etc.).
Depending on the battery charge status, the operating phase and the battery temperature, the UCH determines what
the voltage across the battery terminals should be.
When the battery charge drops, and PR076 Battery voltage after rest decreases, the UCH can temporarily
increase PR075 Alternator setpoint voltage by 1 V for a period of 15 minutes after switching on + after ignition
feed.
Before and during starting, PR075 Alternator setpoint voltage is fixed at 10.7 V.
A maximum of 30 seconds after the engine has started, the UCH sets PR075 Alternator setpoint voltage to the
optimum value calculated.
The injection computer can also control the alternator regulation voltage. The injection computer sends the
maximum authorised power delivered by the engine, to the UCH via the multiplex network. If this power supplied by
the engine is less than the power consumed by the alternator, the UCH reduces the PR075 Alternator setpoint
voltage.
The battery warning light will flash if a low battery charge is detected (no-load voltage less than 12.2 V: voltage
measured during technical use) for the first 12 miles (20 kms), then the warning light stops flashing. Also, the magic
eye of the battery (the hydrometer) is black.
–Access - Security function (see 82D, Access - Security, Role of components).
–Heating and manual air conditioning function (see 61A, Heating, Role of components and 62C, Manual air
conditioning, Role of components).
–Wiping function (see 85A, Washing wiping, Role of components).
–Lighting function (see 80D, Lighting, Role of components). Note:
At the time of user activation, if the mileage is less than 12 miles (20 kms) the charge status is used to display a
warning: this ensures that vehicles are delivered with correct batteries.

87B-25
MR-413-X44-87B000$384.mif
V5
87B
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
DF001
PRESENT
OR
STOREDUCH
1.DEF : Internal electronic fault
NOTESConditions for applying the fault finding procedure to stored faults:
The fault is declared present after the ignition is switched off and back on.
If the fault is stored, clear the fault, switch off the ignition and disconnect the F8 (15A) fuse of the UCH supply
(component code 645) on the passenger compartment fuse and relay box (component code 1016).
–Refit the fuse and switch the ignition back on.
–Request locking and then unlocking, then start the engine.
Check the condition and connection of the PE1, PE2 and PE3 connectors of the UCH (component code 645)
(tabs pushed back, oxidised, broken).
If the connector(s) are faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring
repair, Wiring: Precautions for repair), repair the wiring, otherwise replace the wiring.
Check for + after ignition feed on connection AP43 of component 645.
Check for + accessories feed on connection SP2 (for vehicles fitted with a manual gearbox) or SP15
(for vehicles fitted with a sequential gearbox) of component 645.
Check for earth on connection NAM of component 645. Check the earth on connection MAM of component 645.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If the fault reappears as stored, contact Techline.
If the fault does not reappear, switch the lighting, wipers, vehicle locking and climate control request controls on
and off several times, then read the faults again.
If the fault is still present. Do not operate on the computer, contact Techline.
AFTER REPAIRIf the computer has been replaced (at the request of the Techline): reconfigure the new
UCH (see Configurations and programming).
Deal with any other faults.
UCH_V44_DF001
MR-413-X44-87B000$384.mif
UCH
Vdiag No.: 44

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MR-413-X44-87B000$384.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
UCH
Vdiag No.: 44
87B
DF011
PRESENT
OR
STOREDRAIN/LIGHT SENSOR CIRCUIT
1.DEF : Open circuit or short circuit
NOTESConditions for applying the fault finding procedure to stored faults:
Switch on the ignition, activate automatic headlighting by quickly performing the
following manipulation twice: control stalk (component code 209) on zero position →
control stalk (component code 209) in Side light position.
Status ET114 “Wiper request by rain sensor” should be “Low speed” or “High
speed” when the water runs over the rain/light sensor on the windscreen or
status ET115 “Request for lights to be switched on by light sensor” should be
“Present” by placing an opaque cover over the rain/light sensor.
Note:
If there is an open circuit on connection BPT, there is a malfunction on the
electric windows, rain/light sensor, interior light(s) and luggage compartment
light.
Check that the vehicle has a rain/light sensor (component code 1415).
Check that the function is not deactivated, quickly perform the following cycle twice to activate the automatic
headlighting function: Monolever (component code 209) OFF → Monolever (component code 209) in Side light
ON position.
Check that the vehicle has a rain/light sensor (component code 1415).
Check that LC044 "Rain/light sensor" displays "Present". If not, carry out CF035 "Rain/light sensor".
Check that LC096 "Automatic wiper function" displays "With". If not, carry out CF194 "Automatic wiper
function".
Check that LC095 "Automatic headlight function", displays "With". If not, carry out CF193 "Automatic
headlight function".
Check the condition and the positioning of fuses F2 (15A), F8 (15A), F19 (5A), F27 (5 A) depending on the
equipment and F29 (15A) on the passenger compartment fuse and relay box (component code 1016).
Replace the fuse(s) or repair if necessary.
Check the condition and connection of the PE1, PE2 and PE3 connectors of the UCH (component code 645)
(tabs pushed back, oxidised, broken).
Check for + after ignition feed on connection AP43 of component 645.
Check for + accessories feed on connection SP2 (for vehicles fitted with a manual gearbox) or SP15
(for vehicles fitted with a sequential gearbox) of component 645.
Check for earth on connection NAM of component 645. Check the earth on connection MAM of component 645.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_DF011

87B-32
MR-413-X44-87B000$384.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
UCH
Vdiag No.: 44
87B
DF027
PRESENT
OR
STOREDEXTERNAL TEMPERATURE SENSOR CIRCUIT
1. DEF : Abnormal voltage
CC.0 : Short circuit to earth
C0.1 : Open circuit or short circuit to + 12 V
NOTESConditions for applying the fault finding procedure to stored faults:
The fault is declared present after the ignition is switched off and back on.
Note:
If the exterior temperature sensor is disconnected or the vehicle is not equipped with
an exterior temperature sensor, the temperature displayed is the default temperature
of 215 ˚C.
Check whether the right-hand door mirror is fitted with an exterior temperature sensor. (See MR 411 mechanical
systems 62A, Air conditioning, Air conditioning: List and location of components).
If the vehicle is fitted with an exterior temperature sensor, deal with the following fault finding procedure.
If NO, the vehicle is not fitted with this:
Check that the vehicle is configured without external temperature sensor (component code 240 for left-hand
drive vehicles) or (component code 239 for right-hand drive vehicles):
Check that LC002 "External temperature sensor" is "WITHOUT". Otherwise perform CF029 "External
temperature sensor".
Check the temperature sensor 2-track connector (bent, oxidised, broken tabs).
Check the PE2 40-track connector of the UCH, component code 645 (tabs bent, oxidised, broken).
If the connection is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check the insulation, continuity and the absence of interference resistance on the following connections:
●Connection code 47D between components 240 (for left-hand drive vehicles) or 239 (for right-hand drive
vehicles) and 645.
●Connection code 47C between components 240 (for left-hand drive vehicles) or 239 (for right-hand drive
vehicles) and 645.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Measure the resistance of the sensor (connector disconnected) on connections 47C and 47D.
Temperature (˚C)
0
5
10
15
20
25
30
35Sensor resistance (Ω) ± 50 Ω
5980
5020
4280
3530
2900
2300
2010
1620
Replace the sensor if not correct (see MR 411 Mechanical systems 62A, Air conditioning, Exterior air
temperature sensor: Removal - Refitting).
If there is a fault, contact Techline.
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_DF027

87B-33
MR-413-X44-87B000$384.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
UCH
Vdiag No.: 44
87B
DF040
PRESENT
OR
STOREDREAR SCREEN WIPER PARK POSITION
1.DEF : Open circuit or short circuit to earth
NOTESConditions for applying the fault finding procedure to stored faults:
The fault appears after:
The ignition is switched off and back on again and the rear wipers are operated using
the wiping stalk.
OR
Activating AC007 Rear screen wipers.
This fault may appear if the rear screen wiper motor (component code 211) is forced (e.g.: used on a dry screen,
snow on the screen, etc.).
Check that fuse F36 (15 A) is sound and correctly fitted to the passenger compartment fuse and relay box
(component code 1016).
Replace the fuse if necessary.
Check the condition and connection of the 3-track rear screen wiper motor connector (component code 211)
(broken, bent, oxidised tabs).
Activate the rear screen wiper, check for + 12 V on connection 36A of the rear screen wiper
motor connector (component code 211).
Check that the earth on connection MYH of the rear screen wiper motor connector (component code 211) is in
perfect condition.
Check the condition and connection of the UCH 40-track PE1 connector (component code 645) (tabs broken,
bent or oxidised) and the 3-track rear screen wiper motor connector (component code 211).
If the connector(s) are faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring
repair, Wiring: Precautions for repair), repair the wiring, otherwise replace the wiring.
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_DF040

87B-35
MR-413-X44-87B000$384.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
UCH
Vdiag No.: 44
87B
DF041
PRESENT
OR
STOREDHEATED REAR SCREEN INDICATOR LIGHT CIRCUIT
CC.1 : Short circuit to + 12 volts
NOTESApply this fault only to versions without heating or with manual climate control.
Conditions for applying the fault finding procedure to stored faults:
The fault appears after:
The ignition is switched of f and back on again and the rear screen de-icer is
requested.
OR
Running command AC019 Heated rear screen indicator light.
Check that fuses F29 (15 A) and F42 (10 A) are sound and correctly fitted in the passenger compartment fuse
and relay box (component code 1016) and/or heating.
Replace the fuse(s) if necessary.
Check the air conditioning control panel black 9-track connector, (component code 319) (bent, oxidised or
broken tabs).
Check that the earth on connection NAM of the manual air conditioning control panel black 9-track connector is
in perfect condition.
Check for + 12 V on connection LPD (by running command AC019 Heated rear screen indicator light) of the
manual air conditioning control panel black 9-track connector.
Check for + 12 V accessories feed on connection SP2 of the manual air conditioning control panel black 9-track
connector.
Check that the rear screen de-icing indicator comes on when activating command AC019 Heated rear screen
indicator.
Check the PE1 40-track connector of the UCH, component code 645 (tabs bent, oxidised, broken).
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_DF041