engine RENAULT TWINGO RS 2009 2.G Chasiss ABS Workshop Manual

38C-7
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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

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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
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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

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MR-413-X44-38C000$376_eng.mif
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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

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MR-413-X44-38C000$423_eng.mif
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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
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ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
DF001
PRESENT
OR
STOREDCOMPUTER SUPPLY VOLTAGE
1.DEF: Feed voltage too low
2.DEF: Feed voltage too high
NOTESConditions for applying the fault finding procedure to stored faults:
Apply the fault finding procedure whether the fault is present or stored.
Use the Technical Note wiring diagram for New Twingo.
1.DEF
NOTESSpecial notes: This fault will appear in a road test
(speed greater than 12 mph (20 km/h)) if the computer
supply voltage is below the minimum operating voltage
(9.4 V < min battery voltage < 10 V).
Check the tightness and the condition of the battery terminals.
Check the battery voltage and carry out any work required to obtain the correct voltage (10 V < battery voltage
< 17 V).
Check the charging circuit (see 80A, battery).
Check the condition and position of the 15A and 20A fuses in the engine fuse and relay box.
Check the condition and position of the F10 5 A fuse in the Passenger compartment fuse box.
Consult section 81C, Fuses.
Check the connection and condition (possible damage to the wiring) of the connector of component 1094.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
●Connector of component 1094 disconnected, check the insulation and continuity of connection MAH of
component 1094 (tightness, oxidisation etc.).
●Connectors of component 1094 and R107 disconnected, check the insulation and continuity of
connection AP5 between component 1094 and intermediate connector R107.
●Check the insulation and continuity of connection AP5 between intermediate connector R107 and
component 1016.
●Connectors of component 1094 and R67 disconnected, check the insulation and continuity of
connections BP8 and BP14 between component 1094 and intermediate connector R67.
●Check the insulation and continuity of connections BP8 and BP14 between intermediate connector R67
and component 597.
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, perform a conformity check of component 597.
If all the checks are in order, reconnect the computer and clear the computer fault memory.
Exit the fault finding procedure and carry out a road test.
If the fault is still present, contact the Techline.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_DF001
MK70 ABS
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ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF010
PRESENT
OR
STOREDPUMP MOTOR CIRCUIT
NOTESSpecial notes:
If this fault appears after the computer is replaced, the pump motor connection
has been twisted. Separate the hydraulic unit from the computer and restore the
connection to working order.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present after: Brake pedal held down and AC016 Test pump
motor actuator command.
Use the Technical Note wiring diagram for New Twingo.
Check the tightness and the condition of the battery terminals.
Check the condition and position of the 15A and 20A fuses in the engine fuse and relay box.
Check the condition and position of the F10 5A fuse in the Passenger compartment fuse box.
Consult section 81C, Fuses.
Check the connection and condition (possible damage to the wiring) of the connector of component 1094.
If the connector is faulty (see Technical Note 6015A, Repairing electrical wiring, wiring: Precautions for
repair), repair the connector, otherwise replace the wiring.
●Connector of component 1094 disconnected, check the insulation and continuity of connection MAH of
component 1094 (tightness, oxidisation etc.).
●Connectors of component 1094 and R107 disconnected, check the insulation and continuity of
connection AP5 between component 1094 and intermediate connector R107.
●Check the insulation and continuity of connection AP5 between intermediate connector R107 and
component 1016.
●Connectors of component 1094 and R67 disconnected, check the insulation and continuity of
connections BP8 and BP14 between component 1094 and intermediate connector R67.
●Check the insulation and continuity of connections BP8 and BP14 between intermediate connector R67
and component 597.
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.
Use command AC016 Pump motor test. If the fault is still present (no sound of the pump turning or loss of
communication with the computer), replace the entire unit (pump mechanically seized, pump short circuited, etc.).
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_DF010

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ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF020
PRESENT
TACHOMETRIC INDEX PROGRAMMING
1.DEF: Tachometric index not programmed
NOTESNone
The MK70 ABS computer with the tachometric function 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" using the diagnostic tool.
Once the index has been entered using the VP007 command, clear the computer fault memory and then switch
off the ignition.
Use the PR030 parameter to check that the index has been stored correctly.
If the fault is still present, contact the Techline.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_DF020P

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ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF066
PRESENT
OR
STOREDINJECTION MULTIPLEX SIGNAL ABSENT
NOTESSpecial notes:
Even though it is stored in the computer, this fault does not cause the warning light to
come on or a fault message, because the ABS system is not faulty.
Perform fault finding on the injection system using the diagnostic tool.
Note:
The injection computer does not always store these transient faults as quickly as the
ABS computer.
If no fault is stored in the injection computer, start the engine; if there is no fault
present, contact the Techline. After solving the injection system problem, erase
the faults from the ABS computer memory.
Priority in the event of a number of faults:
Deal with fault DF152 Multiplex network first if it is present or stored.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present when the engine is started up.
Perform a multiplex network test and an injection check (see MR413 Fault finding, 13B, Diesel injection or 17B,
Petrol injection) using the diagnostic tool.
If the fault is still present, contact the Techline.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_DF066

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ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of faults
MK70 ABS
Vdiag No: 04
38C
DF098
PRESENT
OR
STOREDNO UCH MULTIPLEX SIGNAL
NOTESSpecial notes:
Even though it is stored in the computer, this fault does not cause the warning lights to
come on or a fault message, because the ABS system is not faulty.
Perform fault finding on the UCH (Passenger compartment connection unit) using the
diagnostic tool.
Note:
After repairing the fault in the UCH (Passenger compartment connection unit),
clear the fault memory in the ABS system.
Priority in the event of a number of faults:
Deal with fault DF152 Multiplex network
first if it is present or stored.
Conditions for applying the fault finding procedure to stored faults:
The fault is declared present when the engine is started up.
Check the UCH (Passenger compartment connection unit) using the diagnostic tool.
Run a multiplex network test (see 88B, Multiplex).
If the fault is still present, contact the Techline.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_DF098