brake RENAULT TWINGO RS 2009 2.G Chasiss ESP Workshop Manual

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ANTI-LOCK BRAKING SYSTEM
Fault finding – Introduction
Bosch 8.1 ESP
Vdiag No.: 05
38C
5. FAULT FINDING LOG
You will always be asked for this log:
–when requesting technical assistance from the Techline,
–when requesting approval before replacing parts for which approval is compulsory,
–to be attached to monitored parts for which reimbursement is requested. The log is needed for warranty
reimbursement, and enables better analysis of the parts removed.
6. SAFETY INSTRUCTIONS
Safety rules must be observed during any work on a component to prevent any material damage or personal injury:
–check the battery voltage to avoid incorrect operation of computer functions,
–use the proper tools.
It is forbidden to carry out a road test with the diagnostic tool in dialogue with the ECU because the ABS and
Electronic Brake Distribution functions are deactivated. Braking pressure is identical on both vehicle axles
(risk of a spin under heavy braking).IMPORTANTIMPORTANT
All faults involving a complex system call for thorough diagnostics with the appropriate tools. The
FAULT FINDING LOG, which should be completed during the fault finding procedure, ensures a
record is kept of the procedure carried out. It is an essential document when consulting the
manufacturer.
IT IS THEREFORE ESSENTIAL THAT THE FAULT FINDING LOG IS FILLED OUT EVERY TIME IT IS
REQUESTED BY TECHLINE OR THE WARRANTY RETURNS DEPARTMENT.

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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

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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

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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

38C-15V3 MR-413-X44-38C050$070.mif
38C
Bosch 8.1 ESP
Vdiag No.: 05
REPLACING THE COMPUTER:
When replacing the computer (see MR 411, Mechanical, 38C, Anti-lock braking system, Braking computer:
Removal - Refitting), use the following procedure:
–Switch off the ignition.
–Replace the computer.
–Enter the VIN number using command VP001 Enter VIN (see Configurations and Programming).
–Configure the tachometric index using command VP007 Tachometric index (see Configurations and
programming).
–Configure the vehicle parameters using command VP004 Vehicle parameters (see Configurations and
programming).
–Inhibit or authorise illumination of the automatic brake lights (depending on the country's legislation) using
command VP021 Inhibit automatic brake lights or VP022 Authorise automatic brake lights.
–Clear the ESP sensor offsets using command RZ011 Sensors offsets (see Configurations and programming).
–Enter the After-Sales date using command VP006 Enter last APV* operation date.
–Perform a road test followed by a fault reading to confirm that the system is operating correctly.
REPLACING THE STEERING WHEEL ANGLE SENSOR:
–Calibrate the steering wheel angle sensor using command VP003 Steering wheel angle sensor (see
Configurations and programming).
–Clear the ESP sensor offsets using command RZ011 Sensor offsets.
REPLACING THE COMBINED SENSOR:
–Clear the ESP sensor offsets using command RZ011 Sensor offsets.
* APV: After-Sales
ANTI-LOCK BRAKING SYSTEM
Fault finding – Replacement of components

38C-16V3 MR-413-X44-38C050$080.mif
38C
Bosch 8.1 ESP
Vdiag No.: 05
Parameters:
VP001: Enter VIN
This command allows the vehicle identification number to be entered into the computer.
Use this command each time the computer is replaced. The VIN (VF...) is engraved on the manufacturer's plate on
the front right-hand door pillar and stamped on the body under the windscreen on the left-hand side.
VP003: Steering wheel angle sensor
This command is used to calibrate the steering wheel angle.
With the steering wheel horizontal and the front wheels set straight ahead, calibrate the steering wheel angle sensor
using command VP003 on the diagnostic tool.
VP004: Vehicle parameters
This command configures the engine type configuration, the braking definition and the body type. Select the
command VP004 on the diagnostic tool.
VP006: Enter last After-Sales operation date
Whenever the ABS system is worked on in the shop, the date must be entered.
Select command VP006 on the diagnostic tool.
Enter the service date using the diagnostic tool keypad.
VP007: Tachometric index
This command is used to program the computer memory with the index required to calculate the vehicle speed
according to the tyre size.
The BOSCH 8.1 ESP computer supplies the vehicle speed signal to all areas where this information is needed
(instrument panel, engine management, etc.). This vehicle speed signal replaces the one supplied by the speed
sensor located on the gearbox.
The ESP computer calculates the vehicle speed from the wheel speed and the tyre circumference.
The tyre circumference must be programmed into the memory of a new computer. This consists of entering an index
"X" using the command VP007 "Tachometric index" on the diagnostic tool.
Once the number has been entered using the VP007 command, delete the fault in the computer memory and then
switch off the ignition. Use parameter PR030 "Tachometric index" to check that the index entered has been
recognised by the system.
VP021: Inhibit automatic brake lights
This command deactivates the automatic brake lights.
Select command VP021 on the diagnostic tool.
VP022: Automatic brake lights authorisation
This command authorises the automatic brake lights.
Select command VP022 on the diagnostic tool.
* APV: After-SalesNote:
The vehicle speed is supplied by a wire (connection 47F) to the radio, to the electric power-assisted
steering, to the electric sunroof and by the multiplex network for the other computers.
ANTI-LOCK BRAKING SYSTEM
Fault finding – Configurations and programming

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ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault summary table38C
Bosch 8.1 ESP
Vdiag No.: 05
* inj: InjectionTool faultAssociated
DTCDiagnostic tool title
DF100 5158Steering wheel angle multiplex signal absent
DF108 5158Steering wheel angle sensor
DF126 50F4Combined sensor signal plausibility
DF152 50E6Multiplex network
DF153 50C3Multiplex network
DF186 5182No instrument panel multiplex signal
DF187 50CEBrake light activation relay circuit
DF188 50C6Brake light switch circuit
DF189 50F4Combined sensor circuit
DF190 50F4Combined sensor
DF191 50C9ESP on/off button circuit (only on RS version)
DF193 5180Invalid inj.* multiplex signals
DF202 5183Invalid UCH multiplex signals
DF216 5158Steering wheel angle programming offset
DF300 50CAPump motor control circuit
DF311 5188No sequential gearbox multiplex signal (depending on vehicle)
DF313 5188Invalid sequential gearbox multiplex signals (depending on vehicle)
DF321 5180Clutch switch signal consistency

38C-25
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool
If the fault is still present, contact the Techline.
V3 MR-413-X44-38C050$101.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of faults38C
Bosch 8.1 ESP
Vdiag No.: 05
DF007
CONTINUED 1
2.DEFNOTESConditions for applying the fault finding procedure to
stored faults:
The fault is declared present after a road test.
Check the connection and condition (possible wiring damage) of the connectors of components 1094 and 151.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions
for repair), repair the connector, otherwise replace the wiring.
Check the insulation and continuity of connections 4G and 4H between components 151 and 1094.
Also check the insulation between these 2 connections.
If the connection or connections are faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring:
Precautions for repair), repair the wiring, otherwise replace it.
Inspect the condition of the target (metallic contamination etc.).
Clean the target with compressed air if necessary.
For versions equipped with disc brakes:
Check the sensor / target air gap through one wheel revolution (0.1 < rear wheel air gap < 0.9 mm).
If the air gap is incorrect:
–Replace the instrumented bearing/wheel sensor mounting assembly (see MR 411, Mechanical, 33A, Rear axle
components, Rear hub carrier bearing: Removal - Refitting).