wheel RENAULT TWINGO 2009 2.G Chasiss ABS Workshop Manual

38C-7
MR-413-X44-38C000$094_eng.mif
V1
38C
ANTI-LOCK BRAKING SYSTEM
Fault finding - List and location of components
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.
Brake light switch:
●Located on the pedal assembly.
MK70 ABS
Vdiag No: 04
MR-413-X44-38C000$094_eng.mif

38C-8
MR-413-X44-38C000$141_eng.mif
V1
38C
ANTI-LOCK BRAKING SYSTEM
Fault finding - Operating diagram
Number Description
1Computer
2Hydraulic unit (8 solenoid valves)
3Electric power assisted steering
4Instrument panel - engine management
5Passive brake servo
6Brake lights switch
7Diagnostic socket
8Battery
9Wheel speed sensor
10Target
11Brake discs
MK70 ABS
Vdiag No: 04
MR-413-X44-38C000$141_eng.mif

38C-9
MR-413-X44-38C000$188_eng.mif
V1
38C
ANTI-LOCK BRAKING SYSTEM
Fault finding - Function
EBD (electronic braking distribution):
The EBD 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. It prevents the drive wheels from spinning excessively when lifting
off the accelerator or changing down a gear on a low grip surface, by allowing the engine to regulate the driving
torque of the engine (resisting torque compensation) to "relaunch" the wheels.
The system also supplies the other computers with information on the vehicle speed via a wire connection for the
radio, the power steering and the electric sunroof, and via the multiplex network for the other computers. The ABS
computer supplies the multiplex network with the odometry for the instrument panel and navigation system. If heavy
braking produces very rapid deceleration, the ABS computer sends out a request to the UCH (passenger
compartment connection unit) via the multiplex network to ask it to switch on the hazard warning lights (depending
on the law in the relevant country).
MK70 ABS
Vdiag No: 04
MR-413-X44-38C000$188_eng.mif

38C-10
MR-413-X44-38C000$235_eng.mif
V1
38C
ANTI-LOCK BRAKING SYSTEM
Fault finding - Role of components
Wheel speed sensor:
Gives the speed of each of the vehicle's wheels. The analysis of the right/left-hand speeds makes it possible to
calculate in what direction the vehicle is turning.
Brake lights switch:
Visual indication of the brake pedal position. It makes it possible to tell if the driver is braking or not.
Wire connection (vehicle speed):
The ABS computer is best suited to transmit the vehicle speed to the other computers. To do this, the ABS transmits
the vehicle speed on the CAN network. However, some computers are not connected to the CAN network, this is
why the ABS is fitted with a "vehicle speed" wire output. Fault finding is not run on this connection by the ABS
computer. This enables the consumers of this signal to perform the necessary checks during their own fault finding
procedure, or to check the connection by observing the customer complaint on the consumer (for example, increase
in the volume of the radio if the speed increases, electric power-assisted steering).
MK70 ABS
Vdiag No: 04
MR-413-X44-38C000$235_eng.mif

38C-13
MR-413-X44-38C000$376_eng.mif
V1
38C
ANTI-LOCK BRAKING SYSTEM
Diagnostics - Configuration and Programming
SETTINGS
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.
VP004: Vehicle parameters.
This command configures the engine type configuration, the braking definition and the body type.
Select command VP004 on the diagnostic tool.
VP006: Write last After Sales operation date.
Whenever the ABS system is worked on in the shop, the date must be entered.
Select command VP006 "Write date of last After-Sales operation" on the diagnostic tool.
Enter the operation date with the tool keyboard.
VP007: Tachometric index.
This command is used to program the computer memory with the index required to calculate vehicle speed
from the speed at which the wheels turn.
The MK70 ABS 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 ABS computer calculates the vehicle speed from the speed of the wheels and the circumference of the
tyres fitted on the vehicle.
The tyre circumference must be programmed into the memory of a new computer. This consists of entering
an index "X" using 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 correctly
registered.
CONFIGURATIONS
CF079: Gearbox type.
Use this command to configure the gearbox type fitted on the vehicle.
OTHER COMMANDS
LC008: Gearbox type.
This command tells you the gearbox type configured on the vehicle. Note:
The vehicle speed is delivered by 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.
MK70 ABS
Vdiag No: 04
MR-413-X44-38C000$376_eng.mif

38C-14
MR-413-X44-38C000$423_eng.mif
V1
38C
ANTI-LOCK BRAKING SYSTEM
Fault finding - Fault summary table
Tool fault Associated DTC Diagnostic tool title
DF00150 Short circuit Computer supply
DF0065015 Front left-hand wheel speed sensor circuit
DF0075035 Rear left-hand wheel speed sensor circuit
DF008501F Front left-hand wheel speed sensor signal
DF009503F Rear left-hand wheel speed sensor signal
DF01050D3 Pump motor circuit
DF01750C3 Computer
DF0205140 Tachometric index programming
DF0265005 Front right-hand wheel speed sensor circuit
DF0275025 Rear right-hand wheel speed sensor circuit
DF028500F Front right-hand wheel speed sensor signal
DF029502F Rear right-hand wheel speed sensor signal
DF0555143 Vehicle parameter programming
DF06650E2 No injection multiplex signal
DF0905041 Front right-hand wheel target
DF0915042 Front left-hand wheel target
DF0925043 Rear right-hand wheel target
DF0935044 Rear left-hand wheel target
DF0965148 Computer internal electronic irregularity
DF09850E4 No UCH multiplex signal
DF1195150 Gearbox type configuration
DF121D11D Torque requested not available
DF15250E6 Multiplex network
DF18850C6 Brake light switch circuit
DF219D132 ABS multiplex signal consistency
DF2295002 Front right-hand wheel speed
DF2305011 Front left-hand wheel speed
DF2315021 Rear right-hand wheel speed
DF2325031 Rear left-hand wheel speed
DF250D117 Engine speed multiplex signal
DF251D118 Effective average torque multiplex signal
DF252D119 Torque request multiplex feedback signal
DF253D120 Recalculated torque multiplex signal
DF254D12F Resisting torque multiplex signal
DF31150E3 No BVR multiplex signal
MK70 ABS
Vdiag No: 04
MR-413-X44-38C000$423_eng.mif

38C-17
MR-413-X44-38C000$470_eng.mif
V1
MK70 ABS
Vdiag No: 04ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults38C
DF006
PRESENT
OR
STOREDFRONT LEFT-HAND WHEEL SPEED SENSOR CIRCUIT
1.DEF: Fault on the wheel speed sensor circuit
NOTESConditions for applying the fault finding procedure to stored faults:
Follow the fault finding procedure described below for DF006 stored.
Use the Technical Note wiring diagram for New Twingo.
DF006 PRESENT
NOTESNone
Check the connection and condition (possible damage to the wiring) of the connector of component 1094.
Check the connection and condition (possible damage to the wiring) of the connector of component 153.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
Check for a voltage of approximately 12 V between the two connections of component 153 near component 1094.
Is the voltage measured correct?
YES
Swap the 2 front wheel speed sensors over. Clear the computer fault memory.
Switch off the ignition. Switch on the ignition again.
If the fault initially declared as DF006 Front left wheel speed sensor circuit has
become a present DF026 Front right wheel speed sensor circuit, replace the wheel
speed sensor.
If the fault remains on the same side, the wiring between the computer and the sensor is
faulty.
Check insulation and continuity of connections 4C and 4E between
components 153 and 1094.
Also check the insulation between these 2 connections.
If the connection or connections are faulty (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the connectors or wiring,
otherwise replace the wiring.
Check insulation and continuity of connections 4C and 4E between
components 153 and 1094.
Also check the insulation between these 2 connections.
If the connection or connections are faulty (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the connectors or wiring,
otherwise replace the wiring.
If the fault is still present, contact the Techline.
NO
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_DF006

38C-18
MR-413-X44-38C000$470_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF006
CONTINUED
DF006 STORED
NOTESNone
Check the connection and condition (possible damage to the wiring) of the connector of component 1094.
Check the connection and condition (possible damage to the wiring) of the connector of component 153.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
Swap the 2 front wheel speed sensors over.
Clear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
If a fault, which was initially registered as DF006 Front left-hand wheel speed sensor becomes present DF026
Front right-hand wheel speed sensor, replace the wheel speed sensor (see MR411 Mechanical, 38C, ABS,
Wheel speed sensor: Removal - Refitting).
If the fault remains on the same side, the wiring between the computer and the sensor is faulty.
Check insulation and continuity of connections 4C and 4E between components 153 and 1094.
Also check the insulation between these 2 connections.
If the connection or connections are faulty (see Technical Note 6015A, Electrical wiring repair, Wiring:
Precautions for repair), repair the connectors or wiring, otherwise replace the wiring.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.

38C-19
MR-413-X44-38C000$470_eng.mif
V1
MK70 ABS
Vdiag No: 04ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults38C
DF007
PRESENT
OR
STOREDREAR LEFT-HAND WHEEL SPEED SENSOR CIRCUIT
1.DEF: Fault on the wheel speed sensor circuit
NOTESConditions for applying the fault finding procedure to stored faults:
Follow the fault finding procedure described below for DF007 stored.
Use the Technical Note wiring diagram for New Twingo.
DF007 PRESENT
NOTESNone
Check the connection and condition (possible damage to the wiring) of the connector of component 1094.
Check the connection and condition (possible damage to the wiring) of the connector of component 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 for a voltage of approximately 12 V between the two connections of component 151 near
component 1094.
Is the voltage measured correct?
YES
Check 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, Electrical
wiring repair, Wiring: Precautions for repair), repair the connectors or wiring,
otherwise replace the wiring.
If the checks reveal no faults, replace the speed sensor (see MR411 Mechanical
systems, 38C Wheel speed sensor, Removal - Refitting).
Check 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, Electrical
wiring repair, Wiring: Precautions for repair), repair the connectors or wiring,
otherwise replace the wiring.
If all the checks are in order, contact Techline.
NO
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_DF007

38C-21
MR-413-X44-38C000$470_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF008
PRESENT
OR
STOREDFRONT LEFT-HAND WHEEL SPEED SENSOR SIGNAL
1.DEF: Inconsistent sensor signal
2.DEF: No vehicle speed signal
3.DEF: Inconsistent vehicle speed
NOTESPriorities when dealing with a number of faults:
Deal with fault DF006 Front left wheel speed sensor circuit first if it is present.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present during a road test (in excess of 12 mph (20 km/h)
for 2 minutes).
Check the condition of the axle assemblies (impacts, damage, etc.) and the conformity and good condition of the
tyres.
Check that the braking system (condition of brake pads, sealing, sticking, bleed, bearing clearance, etc.) is in
good condition.
Visually inspect the condition of the target (for clogging, metallic contamination, bearing grease, etc.) and clean
using compressed air if necessary.
If there is a lot of grease on the target, contact the Techline.
Check that the wheel speed sensor mounting is in good condition.
Check the conformity of the target (condition, number of teeth = 48) using the special command SC001 Check
target teeth.
If there is non-conformity, replace the target.
Check the connection and condition (possible damage to the wiring) of the connector of component 1094.
Check the connection and condition (possible damage to the wiring) of the connector of component 153.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
Check for a voltage of approximately 12 V between the two connections of the connector of component 153 near
component 1094.
If a 12 V feed is not present, contact the Techline.
If all the checks are in order, swap the 2 front wheel speed sensors. Clear the computer fault memory.
Switch off the ignition. Switch the ignition back on and carry out a road test.
If a fault, which was initially registered as DF008 Front left-hand wheel speed sensor signal has become
present DF028 Front right-hand wheel speed sensor signal, replace the wheel speed sensor
(see MR 411 Mechanical systems, 38C, Wheel speed sensor: Removal - Refitting).
If the fault stays on the same side, the target is faulty, replace the active sensor bearing.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_DF008