2009 RENAULT TWINGO light

38C-82
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V3 MR-413-X44-38C050$160.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of commands38C
Bosch 8.1 ESP
Vdiag No.: 05
AC187BRAKE LIGHT ACTIVATION RELAY
NOTESConditions of use of the command.
Ignition on, engine off.
This command is used to test brake light activation by the ESP when controlling oversteer with sharp deceleration.
ESP_V05_AC187

38C-84
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V3 MR-413-X44-38C050$160.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Interpretation of commands38C
Bosch 8.1 ESP
Vdiag No.: 05
AC196HAZARD WARNING LIGHT ACTIVATION REQUEST
NOTESConditions of use of the command.
Ignition on, engine stopped and vehicle speed zero.
This command is used to send a hazard warning lights activation request to the UCH (Passenger compartment
connection unit) to test their operation in the event of emergency braking depending on the UCH configuration
(Passenger compartment connection unit).
ESP_V05_AC196

38C-85V3 MR-413-X44-38C050$170.mif
38C
Bosch 8.1 ESP
Vdiag No.: 05
NOTESOnly check the customer complaint after performing a full check with the
diagnostic tool.
FAULTS DETECTED ON BRAKING WITH ABS/BRAKING REGULATION
Locking of one or more wheels ALP2
PullALP3
DriftALP4
Unexpected ABS operation at low speed and with slight pedal pressure ALP5
Unexpected ABS operation on a poor road surface ALP6
Unexpected ABS operation when using special equipment (car phone, CB, etc.) ALP7
Lengthening of the brake pedal travel following a regulation phase (with an
irregular pedal when entering the regulation phase)ALP8
Spongy pedalALP9
Brake pedal vibrationALP10
Noises from the pump, the pipes or the hydraulic unit ALP11
ANTI-LOCK BRAKING SYSTEM
Fault finding – Customer complaints

38C-86V3 MR-413-X44-38C050$170.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Customer complaints38C
Bosch 8.1 ESP
Vdiag No.: 05
OTHER CASES
No dialogue with the ABS computer ALP1
ESP computer not detected during the multiplex network test on CLIP ALP12
Illumination of brake lights ALP 13
Unexpected ABS operation at low speeds and slight pedal pressure ALP14
Intermittent illumination of brake, ESP, ABS, SERVICE and STOP warning lights
and the message "Brake failure" on the instrument panel with no fault codes in
the computerALP15

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-99
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
ALP 13 Faulty brake light illumination
NOTESOnly address this customer complaint after a complete check with the diagnostic tool.
Using the diagnostic tool, check the consistent status ET017 "Brake pedal" for pedal pressed and pedal
released.
If inconsistent, apply the fault finding procedure for status ET017 Brake pedal.
If the lights come on continuously, check the operation of component 1281 using command AC187 Brake light
activation relay. The brake lights must light only when the command is run.
Otherwise, with component 1281 removed, check the continuity between connections 65A and 65G of
component 1281.
If continuity is not guaranteed, replace component 1281.
ESP_V05_ALP13