2009 RENAULT TWINGO light

38C -2V3 MR-413-X44-38C050$010.mif
38C
Bosch 8.1 ESP
Vdiag No.: 05
1. APPLICABILITY OF THE DOCUMENT
Th is d ocument p resents the fault finding procedure applica ble to all computers with the following specifications:
2. PREREQUISITES FOR FAULT FINDING:
Documentation type
Fault finding procedures (this document):
–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. REMINDERS
Procedure
To run fault finding on the vehicle computers, switch on the ignition.
Depending on the type of vehicle equipment, proceed as follows:
To cut off + after ignition feed, proceed as follows:Vehicle: New TwingoComputer name: Bosch 8.1 ESP
Function concerned: Bosch ESPVdiag No.: 05
Special tooling required
Multimeter
Elé. 1681Universal bornier
For vehicles with key/radio frequency remote control, use the key to switch on the ignition.
For vehicles with a Renault card,
–with the vehicle card in the card reader,
–press and hold the start button (longer than 5 seconds) with start-up conditions not fulfilled,
connect the diagnostic tool and perform the required operations.
For vehicles with key/radio frequency remote control, use the key to switch off the ignition.
For vehicles with a Renault card,
press the Start button twice briefly (less than 3 seconds),
ensure that the + after ignition feed has been cut off by checking that the computer indicator lights on the instrument
panel have gone out.
ESP_V05_PRELI
ANTI-LOCK BRAKING SYSTEM
Fault finding – Introduction

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ANTI-LOCK BRAKING SYSTEM
Fault finding – Introduction
Bosch 8.1 ESP
Vdiag No.: 05
38C
4. FAULT FINDING PROCEDURE (CONTINUED)
4.1 Wiring check
Fault finding problems
Disconnecting the connectors and/or manipulating the wiring may temporarily clear the cause of a fault.
Visual inspection
Look for damage under the bonnet and in the passenger compartment.
Carefully check the protectors, insulation, and routing of the wiring, as well as the mountings.
Physical inspection
When manipulating the wiring, either use the diagnostic tool to detect a change in status, from "stored" to "present",
or the multimeter to view the status changes.
Make sure that the connectors are firmly secured.
Apply light pressure to the connectors.
Twist the wiring harness.
Checking earth insulation
This check is carried out by measuring the voltage (multimeter in voltmeter mode) between the suspect connection
and the 12 V or 5 V. The correct measured value is 0 V.
Checking insulation against + 12 V or + 5 V
This check is carried out by measuring the voltage (multimeter in voltmeter mode) between the suspect connection
and the earth. In the first instance, the earth may be taken on the chassis. The correct measured value should be 0 V
Continuity check
A continuity check is carried out by measuring the resistance (multimeter in ohmmeter mode), with the connectors
disconnected at both ends. The expected result is 1
± 1 for every connection. The line must be fully checked, and the
intermediate connections are only included in the method if this saves time during the fault finding procedure. The
continuity check on the multiplex lines must be carried out on both wires. The measured value should be 1 ± 1.
Checking the supply
This check may be carried out using a test light (21 W or 5 W depending on the maximum authorised load).

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ANTI-LOCK BRAKING SYSTEM
Fault finding – Introduction
Bosch 8.1 ESP
Vdiag No.: 05
38C
4.2 Checking the connectors
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 pulled slightly.
–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 2 types of connections:
–Connector/Connector.
–Connector/Device.

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Bosch 8.1 ESP
Vdiag No.: 05
38C
The computer/hydraulic unit assembly:
–Located to the left of the bulkhead in the engine compartment.

Front wheel sensors:
–Screwed into the stub-axle, each front sensor has an intermediate connector located behind the plastic wheel arch
liner.
Rear wheel sensor intermediate connectors:
–Located in a sealed unit under the vehicle.
Rear wheel sensors:
–Screwed into the rear brake drum flange (For vehicles equipped with drum brakes).
–Clipped onto the sensor mounting (For vehicles equipped with disc brakes).
Brake light switch:
–Located on the pedal assembly.
Lateral acceleration and yaw speed sensor:
–Located under the passenger seat
ANTI-LOCK BRAKING SYSTEM
Fault finding – List and location of components

38C-11V3 MR-413-X44-38C050$030.mif
38C
Bosch 8.1 ESP
Vdiag No.: 05
Number Description
1Computer/hydraulic unit assembly
2Steering wheel angle
3Torque setpoint on the engine management computer
4Sequential gearbox operating phase (if fitted)
5Instrument panel
6Diagnostic socket
7 UCH
8Vehicle speed wire
9Brake light control relay
10Combined sensor: lateral acceleration and yaw speed
11Brake disc with instrumented bearing target
12Wheel speed sensor
13Battery
14Traction control deactivation button (Only on RS version)
15Brake switch
Electric circuit
Hydraulic circuit
Private multiplex line
Vehicle multiplex line
ANTI-LOCK BRAKING SYSTEM
Fault finding – Functional diagram

38C-12V3 MR-413-X44-38C050$040.mif
38C
Bosch 8.1 ESP
Vdiag No.: 05
EBD (electronic braking distribution):
The electronic braking distribution unit optimises the brakeforce distribution between the front and rear axles.
This function ensures vehicle stability under braking.
ABS (anti-lock braking system):
The ABS prevents the wheels from locking when braking. This function allows the vehicle to be steered under
braking and ensures vehicle stability under braking.
MSR (engine torque control):
This is a function that enhances the ABS function. Its purpose is to prevent the drive wheels from spinning
excessively when lifting off the accelerator or changing down a gear on a low grip surface, by requesting the engine
management to regulate the driving torque of the engine (resisting torque compensation) to "relaunch" the wheels.
ASR (wheel traction control):
This function keeps the drive wheels from slipping during starting or acceleration.
The system brakes the wheel in a slippage situation to maintain full traction.
ESP: Electronic stability program:
The ESP guarantees within physical limits the dynamic stability of the vehicle by checking and correcting oversteer.
In any case, the ESP system does not intervene in place of the driver. Using data from the steering wheel, it merely
makes vehicle handling truer to the driver's intention.
CDC (Dynamic Driving Control):
The Dynamic Driving Control guarantees vehicle steerability within physical limits by checking and correcting
understeer.
The Dynamic Driving Control is an advancement of the ESP system and has same objective: to maintain vehicle
control in all operating situations.
The ESP computer supplies the other computers with information on the vehicle speed via a wire connection for the
radio, the power-assisted steering and the electric sunroof, and via the multiplex network for the other computers.
The ESP computer also supplies the multiplex network with the odometry for the instrument panel and navigation
system.
If heavy braking produces very rapid deceleration, the ESP computer issues a request to the UCH (passenger
compartment connection unit) via the multiplex network asking it to switch on the hazard warning lights (depending
on the law in the relevant country).
ANTI-LOCK BRAKING SYSTEM
Fault finding – Features

38C-13V3 MR-413-X44-38C050$050.mif
38C
Bosch 8.1 ESP
Vdiag No.: 05
Wheel speed sensors:
Give the speed of each of the vehicle's wheels. The analysis of the sensors allows the calculation of the vehicle
speed.
Brake lights switch:
Signals the position of the brake pedal (pressed or released).
Combined sensor (Dual sensor):
Indicates the lateral acceleration and the yaw speed of the vehicle. The analysis of these data combined with the
data from the other sensors allows the determination of the vehicle's path.
Steering wheel angle sensor:
Angular indication of the desired path of the vehicle.
ANTI-LOCK BRAKING SYSTEM
Fault finding – Role of components

38C-14V3 MR-413-X44-38C050$060.mif
38C
Bosch 8.1 ESP
Vdiag No.: 05
Fault finding warning lights programming
Instrument panel warning light Meaning
Brake faultsABS system ESP SERVICE STOP"Brake limiter", ABS, and
ESP functions not working
ABS system ESP SERVICEESP and ABS functions not
working, "brake limiter"
operational
ESP SERVICEESP function not working, ABS
and "brake limiter"
operational
ESP
"Wheel traction control"
function deactivated by fault
finding orESPmomentarily
disco nnected a fter the battery is
disconnected
Brake faults
flashing
at 2 H z (slowly)ABS flashing
at 2 Hz
(slowly)ESP flashing
at 2 Hz (slowly)ESP computer in fault finding
mode
ESP flashing
at 8 Hz
(quickly)ESP or "wheel traction control"
or "anti-lock brake system on
engine torque control" active
ABS flashing
at 8 Hz
(quickly)Tachometric index not
programmed
Brake faults ABS systemESP flashing
at 8 Hz
(quickly)SERVICE STOPVehicle variant not
programmed
Brake faultsABS flashing
at 8 Hz
(quickly)ESP flashing
at 8 Hz
(quickly)STOPVehicle option and tachometric
index not programmed
Note:
The STOP warning light is always accompanied by a single audible warning (1 beep).
ANTI-LOCK BRAKING SYSTEM
Fault finding – Defect and safe modes