2009 RENAULT TWINGO RS ABS

38C-87
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V3 MR-413-X44-38C050$180.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault finding chart38C
Bosch 8.1 ESP
Vdiag No.: 05
ALP1 No dialogue with the ABS/ESP computer
NOTESOnly address this customer complaint after a complete check with the diagnostic tool.
Use the Wiring Diagram Technical Note for New Twingo.
Try to establish dialogue with an ESP computer on another vehicle to make sure that the diagnostic tool is not
faulty. If the tool is not at fault, and dialogue cannot be established with any other computer on the same vehicle,
the cause could be a faulty computer interfering on the multiplex network.
Check the tightness and condition of the battery terminals (see 80A, Battery).
Check the charging circuit (see 16A, Starting - Charging).
Check that the power supply to the diagnostic socket is correct:
Check for + 12 V on connection BP19 of component 225.
Check for earth on connections MAM and NAM of component 225.
If the connections are faulty (see Technical Note 6015A, Repairing electrical wiring, Wiring: Precautions for
repair), repair the wiring, otherwise replace it.
Apply the fault finding procedure for specification 1. DEF of fault DF001 Computer supply.
Carry out fault finding on the multiplex network using the diagnostic tool (see 88B, Multiplexing).
If dialogue has still not been established after these checks, contact Techline.
ESP_V05_ALP1
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault finding chart

38C-88
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V3 MR-413-X44-38C050$180.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault finding chart38C
Bosch 8.1 ESP
Vdiag No.: 05
ALP2 Locking or braking of one or more wheels
NOTESOnly consult this customer complaint after a full check with the diagnostic tool.
Check the conformity of the mechanical components (see MR 411, Mechanical,
30A, General information, Brake, Specifications).
REMINDERLocking 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.
Braking with ABS regulation on very poor roads can cause significant squealing.
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.
Use parameters PR001 Front right-hand wheel speed, PR002 Front left-hand wheel speed, PR003 Rear right-
hand wheel speed and PR004 Rear left-hand wheel speed whilst slowly turning the wheels in question and
checking 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.
If a single reading is incorrect:
–Check that the sensor casing is secured when rotating.
–Check that the wheel speed sensor mounting is in good condition.
–If that is unsuccessful, replace the corresponding sensor and repeat the check procedure (see MR 411
Mechanical, 38C, Anti-lock braking system, Wheel speed sensor: Removal - Refitting).
–A possible inversion of the pipes on the hydraulic unit (see MR 411, Mechanical, 38C, Anti-lock braking
system, Hydraulic braking unit, List and location of components).
Run commands AC003 Front left-hand wheel solenoid valves, AC004 Front right-hand wheel solenoid
valves, AC005 Rear left-hand wheel solenoid valves and AC006 Rear right-hand wheel solenoid valves while
depressing the brake pedal and check for locking/unlocking cycles on the wheel concerned (see Dealing with
command modes).
If the cycles are not detected on the wheel tested (wheel remains locked), check if they occur on another wheel
(confirmation of a reversal after a repair, see MR 411, Mechanical, 38C, Hydraulic braking unit, List and
location of components).
If the cycles are not detected on a wheel and the pipes have not been inverted, replace component 1094
(see MR 411, Mechanical, 38C, Hydraulic braking unit, Removal- Refitting).
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: the condition and the number of teeth= 48 (using the command SC001
"Check target teeth").
Replace if necessary.
If the fault is still present after these checks, replace component 1094 (see MR 411, Mechanical, 38C, Hydraulic
braking unit, Removal- Refitting).
ESP_V05_ALP2

38C-89
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V3 MR-413-X44-38C050$180.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault finding chart38C
Bosch 8.1 ESP
Vdiag No.: 05
ALP3 Pull
NOTESOnly consult this customer complaint after a full check with the diagnostic tool.
Check the conformity of the mechanical components (see MR 411, Mechanical,
30A, General information, Brake, Specifications).
Disconnect one wheel speed sensor.
Start the engine and check that only the ABS
and ESP fault warning lights are lit.
Is the brake fault warning light also lit?Do not drive, the "braking compensator" function
cannot be carried out (risk of a spin).
Deal first with the faults using the diagnostic tool.
Drive the vehicle and operate the brakes.
Is the customer complaint still present
under these conditions?If the brake pedal travel is comparatively long, bleed
the brake circuit (see MR 411, Mechanical, 30A,
General information, Brake circuit, Bleeding).
If the travel is normal, check that the 4 vehicle tyres
are identical and in accordance with the
manufacturer's recommendations (see MR 411,
Mechanical, 35A, Wheels and tyres, Tyre, Tyre
pressure, Identification and Tyre, Identification).
Check and adjust the wheel alignment (see MR 411,
Mechanical, 30A, General information, Front
axle, Adjustment).
Check for any leaks on the brake circuit.
Apply the fault finding procedure described in the ALP 2
"Locking of one or several wheels".
YES
NO
YES
NO
ESP_V05_ALP3

38C-90
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V3 MR-413-X44-38C050$180.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault finding chart38C
Bosch 8.1 ESP
Vdiag No.: 05
ALP4 Drift
NOTESOnly address this customer complaint after a complete check with the diagnostic tool.
Disconnect one wheel speed sensor.
Start the engine and check that only the ABS
and ESP fault warning lights are lit.
Is the brake fault warning light also lit?Do not drive, the "braking compensator" function
cannot be carried out (risk of a spin).
Deal first with the faults using the diagnostic tool.
Drive the vehicle and operate the brakes.
Is the customer complaint still present
under these conditions?It is a road holding fault not related to the ABS/ESP
system.
Check the condition and conformity of the front and
rear brake linings.
Check that the 4 vehicle tyres are identical and in
accordance with the manufacturer's
recommendations (see MR 411, Mechanical, 35A,
Wheels and tyres, Tyre pressure, Identification
and Tyres, Identification).
Check that the pressures of the 4 tyres conform to
the manufacturer's recommendations (see MR 411,
Mechanical, 35A, Wheels and tyres, Tyre
pressure, Identification).
Check and adjust the wheel alignment (see MR 411,
Mechanical, 30A, General information, Front
axle, Adjustment).
Normal behaviour linked to the system operation during the
regulation phase, mainly on surfaces with uneven grip or
which are poorly laid.
YES
NO
YES
NO
ESP_V05_ALP4

38C-91
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V3 MR-413-X44-38C050$180.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault finding chart38C
Bosch 8.1 ESP
Vdiag No.: 05
ALP5Unexpected ABS operation at low speed and with slight pedal
pressure
NOTESOnly address this customer complaint after a complete check with the diagnostic tool.
Important: ABS regulation is sensitive on slippery surfaces (ice, wet cobbled
streets, etc.).
Brake pedal vibrations associated with the reactions of the system may be felt in
particular circumstances, such as:
–Crossing speed bumps.
–Tight cornering with lifting of the inside rear wheel.
These vibrations also may be linked merely to activation of the Braking distributor
function, when the pressure on the rear axle is limited.
Check the conformity of the mechanical components (see MR 411, Mechanical,
30A, General information, Brake, Specifications).
If the fault is not one of the situations indicated above, check the correct connection of the wheel speed sensors,
the air gap between these sensors and the magnetic targets.
Refer to the interpretation of fault DF063 Wheel speed consistency.
ESP_V05_ALP5

38C-92
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V3 MR-413-X44-38C050$180.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault finding chart38C
Bosch 8.1 ESP
Vdiag No.: 05
ALP6 Unexpected ABS system intervention on a poor road surface
NOTESOnly address this customer complaint after a complete check with the diagnostic tool.
Check the conformity of the mechanical components (see MR 411, Mechanical,
30A, General information, Brake, Specifications).
On poor road surfaces it is normal to feel hesitation and vibrations of the pedal as well grating which is more
significant than on good surfaces.
This gives the impression of a variation in efficiency, but this should be considered normal.
ESP_V05_ALP6

38C-93
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V3 MR-413-X44-38C050$180.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault finding chart38C
Bosch 8.1 ESP
Vdiag No.: 05
ALP7Unexpected ABS operation when using special equipment
(car phone, CB, etc.)
NOTESOnly address this customer complaint after a complete check with the diagnostic tool.
Check that the equipment which is causing the fault is approved.
Check that this equipment was correctly installed without modification of the original wiring, in particular that of
the ABS/ESP.
Connections to earth and to the ABS/ESP supply are forbidden.
ESP_V05_ALP7

38C-94
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V3 MR-413-X44-38C050$180.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault finding chart38C
Bosch 8.1 ESP
Vdiag No.: 05
ALP8Lengthening of the brake pedal travel following a regulation
phase (with an irregular pedal when entering the regulation
phase)
NOTESOnly address this customer complaint after a complete check with the diagnostic tool.
Check the conformity of the mechanical components (see MR 411, Mechanical,
30A, General information, Brake, Specifications).
Bleed the primary hydraulic circuit (see MR 411, Mechanical, 30A, General information, Brake circuit,
Bleeding).
After the operation, carry out a road test with ABS regulation.
If the fault is still present:
Carry out an After-Sales bleed using command SC006 Bleed hydraulic unit and brake circuit.
After the operation, carry out a road test with ABS regulation.
If the fault is still present:
Bleed the primary hydraulic circuit again (see MR 411, Mechanical, 30A, General information, Brake circuit,
Bleeding).
After the operation, carry out a road test with ABS regulation.
If the customer complaint is particularly pronounced, and bleeding the circuit does not improve matters, replace
component 1094 (see MR 411, Mechanical, 38C, Hydraulic brake unit, Removal - Refitting).
ESP_V05_ALP8