brake sensor RENAULT KANGOO 2013 X61 / 2.G ABS Bosch 8.1 Workshop Manual

38C-3V1 MR-376-X76-38C000$020.mif
38C
ABS BOSCH 8.1
Vdiag No.: 18
The anti-lock braking system consists of:
– four wheel speed sensors (1),
– a brake servo assembly (2),
– a brake pedal sensor (3),
– a pump assembly (4) consisting of:
●a hydraulic pump,
●a pressure modulation unit (eight solenoid valves),
●a computer,
●a pressure sensor.
1
4
23
11
1
ANTI-LOCK BRAKING SYSTEM
Fault finding – List and location of components

38C-4V1 MR-376-X76-38C000$030.mif
38C
ABS BOSCH 8.1
Vdiag No.: 18
Wheel speed sensor:
Gives the speed of each of the vehicle's wheels.
Analysis of the speeds of the right-hand and left-hand wheel allows the turning direction of the vehicle to be
deduced.
Brake lights switch:
Visual indication of the brake pedal position.
It indicates whether the driver is depressing the brake pedal.
ANTI-LOCK BRAKING SYSTEM
Fault finding – Role of components

38C-6V1 MR-376-X76-38C000$040.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Operating diagram38C
ABS BOSCH 8.1
Vdiag No.: 18
1 ABS computer 6 Front wheel speed sensor
2 Brake switch 7 Rear wheel speed sensor
3 After ignition supply 8 Diagnostic socket
4 Permanent supply 9 Vehicle speed signal
5 Earth 10 Fault warning lights on the instrument panel
Electric circuit Hydraulic circuit

38C-47
AFTER REPAIRClear the computer memory using command RZ001 Fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V1 MR-376-X76-38C000$170.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault Finding Chart38C
ABS BOSCH 8.1
Vdiag No.: 18
ALP2 Locking of one or more wheels
NOTESOnly address this customer complaint after a complete check with the diagnostic
tool.
Reminder:
Locking of the wheels on a vehicle fitted with ABS or squealing of tyres, interpreted by the customer as locking,
could be related to a normal reaction of the system and should not automatically be assumed to be a fault (braking
with ABS regulation on a very bad road causes considerable squealing).
However, if the wheel(s) is/are actually locking, lift the vehicle so that you can turn the wheels and check for:
– 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 by turning the relevant wheels 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.
– Possible inversion of pipes on the hydraulic unit.
Use 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 the occurrence of locking/unlocking cycles on the wheel
concerned (see Command summary table). If the cycles do not occur on the wheel tested (wheel remains
locked), check whether they occur on another wheel to confirm reversed pipes.
If the cycles do not occur on one wheel and the pipes have not been inverted, contact the Techline.
ABS8.1X76_V18_ALP2

38C-49
AFTER REPAIRClear the computer memory using command RZ001 Fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V1 MR-376-X76-38C000$170.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault Finding Chart38C
ABS BOSCH 8.1
Vdiag No.: 18
ALP3 Pull
NOTESOnly address this customer complaint after a complete check with the diagnostic
tool.
Disconnect one wheel speed sensor.
Start the engine and ensure that only the ABS fault warning light comes on. Do not drive the vehicle if the brake
fault warning light is also illuminated because the "braking compensator" function is no longer guaranteed.
Carry out a road test with the ABS thus out of order.
Is the fault still present under these conditions?
Raise the vehicle so that you can rotate the wheels and check:
– whether the speed sensors have been incorrectly
connected,
– whether the pipes on the hydraulic unit have been inverted.
For these two tests, consult and apply the procedures defined
in ALP2 Locking of one or several wheels.
Check the condition and conformity of the ABS targets.
If the fault is still present, contact the techline.If 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.
NOYES
ABS8.1X76_V18_ALP3

38C-50
AFTER REPAIRClear the computer memory using command RZ001 Fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V1 MR-376-X76-38C000$170.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault Finding Chart38C
ABS BOSCH 8.1
Vdiag No.: 18
ALP4 Drift
NOTESOnly address this customer complaint after a complete check with the diagnostic
tool.
Disconnect one wheel speed sensor.
Start the engine and ensure that only the ABS fault warning light comes on. Do not drive the vehicle if the brake
fault warning light is also illuminated because the "braking compensator" function is no longer guaranteed.
Carry out a road test with the ABS thus out of order.
Is the fault still present under these conditions?
Normal behaviour linked to the system operation during
the regulation phase, mainly on surfaces with uneven
grip or which are poorly laid.Road holding fault not related to the ABS.
Check the condition of the brake linings and that
they are to specification and check the tyre
pressures, the front axle, etc.
NOYES
ABS8.1X76_V18_ALP4

38C-51
AFTER REPAIRClear the computer memory using command RZ001 Fault memory.
Carry out a road test followed by another check with the diagnostic tool.
V1 MR-376-X76-38C000$170.mif
ANTI-LOCK BRAKING SYSTEM
Fault finding – Fault Finding Chart38C
ABS BOSCH 8.1
Vdiag No.: 18
ALP5Unexpected ABS operation at low speed and slight pedal
pressure
NOTESOnly address this customer complaint after a complete check with the diagnostic
tool. Warning: ABS control is sensitive to poor traction (icy roads, wet cobblestones,
etc.).
It is possible to feel brake pedal vibrations which are associated with the reaction of the system in particular
circumstances, such as:
– crossing rumble strips,
– tight cornering with lifting of the inside rear wheel.
These vibrations may be linked to simple brake limiter activation, when the pressure on the rear axle is limited.
If the fault is different, check the speed sensor connectors (micro-breaks).
ABS8.1X76_V18_ALP5