2009 RENAULT TWINGO RS brake

38C-53
MR-413-X44-38C000$658_eng.mif
V1
38C
ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of statuses
ET017
BRAKE PEDAL
NOTESSpecial notes:
Only carry out the checks if the PRESSED and RELEASED statuses are inconsistent
with the pedal position.
Use the Technical Note wiring diagram for New Twingo.
STATUS
"RELEASED"
Brake pedal
depressed
If brake lights operate:
–Check the continuity of connection 65A between components 160 and 1094.
If the connector is faulty (see NT6015, Repairing electrical wiring, wiring: Precaution
for repairs), repair the connector, otherwise replace the wiring.
If the brake lights are not working:
–Check the condition, mounting and adjustment of the brake light switch and the
conformity of the bulbs.
–Remove the brake light switch and check that it is operating correctly:
Connection continuity Connection insulation
Switch pressed
(Brake pedal released)AP10 and 5A AP10 and 65A
Switch released
(Brake pedal depressed)AP10 and 65A AP10 and 5A
–Replace the switch if necessary.
Intermediate connector R107 and component 160 and 1081 disconnected:
–Check the continuity and insulation of connection AP10 between
component 1016 and intermediate connector R107.
–Check the continuity and insulation of connection AP10 between
component 160 and intermediate connector R107.
If the connector is faulty (see NT6015, Repairing electrical wiring, wiring:
Precaution for repairs), repair the connector or the wiring, otherwise replace the
wiring.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_ET017
MK70 ABS
Vdiag No: 04
MR-413-X44-38C000$658_eng.mif

38C-54
MR-413-X44-38C000$658_eng.mif
V1
MK70 ABS
Vdiag No: 04ANTI-LOCK BRAKING SYSTEM
Fault finding - Interpretation of statuses38C
ET017
CONTINUED 1
Connectors of components 645, 172, 173, 639 and 1094, intermediate connectors
R107 and R15 and connector of component 119 (if present on the vehicle)
disconnected from connection 65A:
–Check the insulation of connection 65A between component 160 and
intermediate connector R107.
–Check the insulation of connection 65A between component 172 and
intermediate connector R107.
–Check the insulation of connection 65A between component 173 and
intermediate connector R107.
–Check the insulation of connection 65A between intermediate connectors R107
and R15.
–Check the insulation of connection 65A between component 639 and
intermediate connector R15.
–Check the insulation of connection 65A between component 645 and
intermediate connector R107.
If the connector is faulty (see NT6015, Repairing electrical wiring, wiring:
Precaution for repairs), repair the connector, otherwise replace the wiring.
–Check for + 12 V after ignition feed on connection AP10 of component 1016 to
earth MAH.
If the checks reveal no faults, carry out a check of each component associated with
connection 65A and AP10 (short circuits).
Check the condition and positioning of the F5 5A fuse (see MR411 Mechanical
systems, 81C, Fuses: 16A).
–Check the condition, mounting and adjustment of the brake light switch and the
conformity of the bulbs.
–Remove the brake light switch and check that it is operating correctly:
Connection continuity Connection insulation
Switch pressed
(Brake pedal released)AP10 and 5A AP10 and 65A
Switch released
(Brake pedal
depressed)AP10 and 65A AP10 and 5A
–Replace the switch if necessary.
Connectors of components 645, 172, 173, 639 and 1094, intermediate
connectors R107 and R15 and connector of component 119 (if present on the vehicle)
disconnected from connection 65A
–Check the insulation of connection 65A between component 160 and
intermediate connector R107.
STATUS
DEPRESSED:
Brake pedal
released
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.

38C-56
MR-413-X44-38C000$705_eng.mif
V1
38C
ANTI-LOCK BRAKING SYSTEM
Fault finding - Dealing with computer statuses and parameters
PARAMETERS
PR001: Front right-hand wheel speed.
PR002: Front left-hand wheel speed.
PR003: Rear right-hand wheel speed.
PR004: Rear left-hand wheel speed.
These parameters indicate the speed in mph (km/h) of each wheel on the vehicle.
PR005: Computer supply voltage.
This parameter indicates the computer supply voltage in volts.
PR030: Tachometric index.
This parameter specifies the tachometric index entered in the computer for the tyres fitted to the vehicle.
PR038: Vehicle speed.
This parameter indicates the vehicle speed in mph (km/h).
PR063: Vehicle parameters.
This parameter shows whether the configuration (VP004 "Vehicle parameters") matches the vehicle
undergoing fault finding.
STATUS
ET017: Brake pedal
This status gives the position (depressed or released) of the brake pedal
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
MK70 ABS
Vdiag No: 04
MR-413-X44-38C000$705_eng.mif

38C-59
MR-413-X44-38C000$846_eng.mif
V1
38C
ANTI-LOCK BRAKING SYSTEM
Fault finding - Dealing with command modes
AC003
AC004
AC005
AC006FRONT LEFT-HAND WHEEL SOLENOID VALVES
FRONT RIGHT-HAND WHEEL SOLENOID VALVES
REAR LEFT-HAND WHEEL SOLENOID VALVES
REAR RIGHT-HAND WHEEL SOLENOID VALVES
NOTESConditions of use of the command.
Ignition on, engine stopped and vehicle speed zero.
Before using the commands, check that the battery is fully charged.
The previous 4 commands allow the hydraulic check of each wheel.
Raise the vehicle in order to be able to rotate the wheels, and check that they rotate freely.
Keep the brake pedal depressed to prevent the wheel being tested from being turned by hand (do not brake so
firmly that full braking power is reached).
Select and confirm the command of the wheel being examined (e.g. Front left-hand wheel solenoid valves, etc.)
Turn the wheel concerned by hand; 5 locking/unlocking cycles should be noted on the wheel.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_AC003 / ABS_V04_AC004
ABS_V04_AC005 / ABS_V04_AC006
MK70 ABS
Vdiag No: 04
MR-413-X44-38C000$846_eng.mif

38C-61
MR-413-X44-38C000$846_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Dealing with command modes
MK70 ABS
Vdiag No: 04
38C
AC153
AC154
AC155
AC156BLEED FRONT LEFT-HAND WHEEL
BLEED FRONT RIGHT-HAND WHEEL
BLEED REAR LEFT-HAND WHEEL
BLEED REAR RIGHT-HAND WHEEL
NOTESConditions of use of the command.
Ignition on, engine stopped and vehicle speed zero.
Before using the commands, check that the battery is fully charged.
These 4 commands should only be used if you observe lengthening of the brake pedal travel during a road test
with ABS regulation (the system should have been bled in advance using the conventional procedure).
See ALP8.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_AC153 / ABS_V04_AC154
ABS_V04_AC155 / ABS_V04_AC156

38C-64
MR-413-X44-38C000$893_eng.mif
V1
38C
ANTI-LOCK BRAKING SYSTEM
Fault finding - Customer complaints
NOTESOnly consult this customer complaint after a complete check with the
diagnostic tool.
FAULTS DETECTED ON BRAKING WITH ABS/BRAKING REGULATION
LOCKING OF ONE OR MORE WHEELS ALP 2
PULLING ALP 3
DRIFT ALP 4
UNEXPECTED ABS OPERATION AT LOW SPEEDS AND SLIGHT PEDAL
PRESSURE ALP 5
UNEXPECTED ABS OPERATION ON A POOR ROAD SURFACE ALP 6
UNEXPECTED ABS OPERATION WHEN SPECIAL EQUIPMENT
USED (CAR PHONE, CB, ETC.) ALP 7
EXTENSION OF BRAKE PEDAL TRAVEL FOLLOWING
REGULATION PHASE (WITH LEAKING PEDAL WHEN STARTING
REGULATION PHASE)ALP 8
SPONGY PEDAL ALP 9
BRAKE PEDAL VIBRATION ALP 10
NOISES FROM THE PUMP, PIPES OR HYDRAULIC UNIT ALP 11
OTHER CASES
NO DIALOGUE WITH THE ABS COMPUTER ALP 1
MK70 ABS
Vdiag No: 04
MR-413-X44-38C000$893_eng.mif

38C-67
MR-413-X44-38C000$940_eng.mif
V1
ANTI-LOCK BRAKING SYSTEM
Fault finding - Fault Finding Chart
MK70 ABS
Vdiag No: 04
38C
ALP 2 Locking of one or more wheels
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
Check the conformity of the mechanical components.
NOTESLocking of wheels on a vehicle fitted with ABS or squealing of the tyres, which feels
like locking to the customer, may be linked to normal operation of the system and
should not always be considered a fault:
–Locking is allowed below 4 mph (6 km/h) (system regulation will not be activated).
–Braking with ABS system regulation on very poor roads (significant grating).
However, if the wheel(s) is/are actually locking, lift the vehicle in order to be able to rotate the wheels and check:
–Possible inversion when connecting the speed sensors.
Using parameters PR001, PR002, PR003 and PR004, rotate the wheels slowly and check the consistency of the
results obtained.
If the value measured is zero, rotate the other wheels to confirm an electrical inversion of the sensors and repair
the wiring harness.
–Possible inversion of pipes on the hydraulic unit.
Use commands Front left wheel solenoid valves, Front right wheel solenoid valves, Rear left wheel solenoid
valves and Rear right wheel solenoid valves while depressing the brake pedal and check for 10 unlocking/locking
cycles on the wheel concerned (see Dealing with command modes). If the 10 cycles are not carried out on the
wheel tested (wheel remains locked), check whether they are carried out on another wheel (confirmation of a
reversal: repair).
If the 10 cycles are not detected on a wheel and the pipes have not been reversed, change the hydraulic unit.
Check that the sensor holder does not rotate (depending on fitting).
Check the quality of the mounting of the wheel speed sensors (correct clipping for the front wheels).
Check the conformity of the targets: condition, number of teeth = 48 (using command SC001 Check target
teeth).
If the fault is still present after these checks, replace the hydraulic unit.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_ALP2

38C-68
MR-413-X44-38C000$940_eng.mif
V1
MK70 ABS
Vdiag No: 04ANTI-LOCK BRAKING SYSTEM
Fault finding - Fault Finding Chart38C
ALP 3 Pull
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
Check the conformity of the mechanical components.
Disconnect one wheel speed sensor.
Start the engine and ensure that only the ABS
system fault warning light comes on. Do not drive
the vehicle if the brake fault warning light is also lit,
as the "EBD" (brake limiter) function is no longer
ensured.
Carry out a road test with the ABS thus out of order.
Is the customer complaint still present under
these conditions?
NO
Raise the vehicle so that you can rotate the wheels
and check:
–Possible inversion when connecting the speed
sensors.
–Possible inversion of pipes on the hydraulic unit.
For these two tests, refer to and apply the
procedures described in ALP 2.
Check the condition and conformity of the ABS
targets.
If necessary, replace the targets.
If the fault is still present replace the hydraulic unit.
YESIf the brake pedal travel is relatively long,
bleed the brake circuit.
If the travel is normal, check the tyre
pressures, the front axle, or for any leaks
in the circuit.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_ALP3