1997 RENAULT KANGOO ABS

B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
REILLUMINATION OF WARNING LIGHT AFTER STARTING THE ENGINE
TEMPORARY ILLUMINATION OF ABS WARNING LIGHT WHEN DRIVINGFault chart 3
Check the voltage of the computer power supply : 9.5 volts < correct voltage < 17.5 volts.
If necessary, carry out the following operations :
- Check the battery charge (check the charging circuit if necessary).
- Check the tightness and condition of the battery terminals.
- Check the ABS earths (tightness of two earth bolts above the ABS assembly).
Disconnect the computer and check the condition and the positioning of the shunt in the 31 track
connector (between track 19 and track 21).
Check on the computer side, the condition of the shunt opening pin.
Only consult this section after a complete check with the XR25 kit.NOTES
38-23

B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
LOCKING OF ONE OR MORE WHEELSFault chart 4
REMINDER:Wheel locking on a vehicle equipped with ABS, or tyre squeal, considered by the customer
as locking, can be linked to a normal reaction of the system and should not be systematically
considered as a fault :
- locking is allowed below 3.75 mph ( 6 km/h) (the system will not provide regulation).
- Braking with ABS regulation under very bad road conditions (high degree of tyre squeal).
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Only consult this section after a complete check with the XR25 kit.NOTES
On the other hand, if there really is wheel locking on one or more wheels, lift the vehicle so the wheels can
be turned, and check :
- a possible incorrect connection in the speed sensor connection.
• Use operations #01, #02, #03 and #04 while turning the appropriate wheel and ensure the consis-
tency of the results obtained .
• If the value measured is zero, turn the other wheels to confirm a bad electrical connection of the sen-
sors and repair the wiring.
- A possible incorrect connection of the hydraulic assembly pipes.
• Use operations G03*, G04*, G05* and G06* while applying the brake and check for the ten cycles of
unlocking/locking on the wheel concerned (consult section "Aid").
• If the ten cycles do not occur on the wheel tested, (wheel remains locked), see if they occur on ano-
ther wheel (if a bad connection is confirmed: repair).
• If the ten cycles do not occur on a wheel and the pipes are correctly connected, replace the hydraulic
assembly.
• Check the condition of the ABS targets and that they conform.
• Also check the sensor/target air gap by rotating each of the wheels :
Front 0.13 mm < air gap over one rotation < 1.96 mm.
Rear 0.03 mm < air gap over one rotation < 2.4 mm (check only possible on vehicles with four-bar
rear axles).
If the fault persists after these checks, replace the hydraulic assembly.
38-24

B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
yes
PULLINGFault chart 5
Only consult this section after a complete check with the XR25 kit.NOTES
Lift the vehicle so the wheels can be turned
and check for :
- a possible incorrect connection in the
speed sensors,
- a possible incorrect connection of the
hydraulic assembly piping.
For these two checks, consult and apply the
methods defined in Fault Chart 4.Check the
condition of the ABS targets and that they
conform. Also check the sensor/ target air
gap by rotating each wheel.
If the fault persists, replace the hydraulic
assembly.
If the pedal travel is relatively long, bleed
the brake circuit.
If it is normal, check the tyre pressure, the
front axle assembly
or possibly for leaks in the circuit.
no
Remove the 10A ABS fuse on the passenger
compartment connection unit and carry out
a road test with the ABS non-operational.
Does the fault persist under these
conditions?
38-25

B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
yes
WANDERINGFault chart 6
Remove the 10A ABS fuse in the passenger
compartment connection unit and carry out
a road test with ABS non-operational.
Does the fault persist under these
conditions?
Only consult this section after a complete check with the XR25 kit.NOTES
Normal behaviour linked to system
operation in the regulation phase
essentially because of asymmetrical grip or
poor road surface.
Handling fault not linked to ABS system.
Check the condition and conformity of
brake linings, check tyre pressures, front
axle assembly, ...
no
38-26

B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
UNEXPECTED ABS OPERATION AT LOW SPEEDS AND
WHEN LITTLE PRESSURE APPLIED TO BRAKE PEDALFault chart 7
It is possible to feel brake pedal vibrations which are linked to reactions of the system in particular
situations :
- Crossing speed bumps.
- Rear inside wheel lifts on tight bends.
If the problem is different, check the speed sensors connectors ( micro-breaks) as well as the air gaps.
Only consult this section after a complete check with the XR25 kit.NOTES
38-27

B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
UNEXPECTED ABS OPERATION
UNDER POOR ROAD CONDITIONSFault chart 8
Under poor road conditions, it is normal to feel jerky operation and vibration of the pedal and a higher
degree of tyre squeal than on a good road surface.
This results in a feeling that there is variation in efficiency, but this is normal.
Only consult this section after a complete check with the XR25 kit.NOTES
38-28

B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
UNEXPECTED ABS OPERATION WHEN USING SPECIAL
EQUIPMENT (MOBILE PHONE,CB...)Fault chart 9
Check that equipment causing the problem during use is approved.
Check that this equipment has been correctly installed without modification to the original wiring, in
particular, that of the ABS (connections to earth and + after ignition/ before ignition of the ABS are not
permitted).
Only consult this section after a complete check with the XR25 kit.NOTES
38-29

B76531.0
ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM
Fault finding - Fault chart 38
ABS BOSCH
5.3
AFTER REPAIR Carry out a road test, then a check with the XR25 kit.
BRAKE PEDAL TRAVEL EXTENDED FOLLOWING A
REGULATION PHASE
(WITH IRREGULAR PEDAL AT START OF REGULATION)
Fault chart 10
Passage of air from the hydraulic assembly regulation channels to brake circuits.
Bleed the circuits according to the procedure recommended in the Technical Note (use of XR25 command
modes. These command modes are described in the section "Aid").
After the operation, carry out a road test with ABS regulation.
Only consult this section after a complete check with the XR25 kit.NOTES
If the fault persists, carry out the preceding operation once or twice more.
If customer complaint is particularly serious and bleeding brings about no improvement, replace the
hydraulic assembly.
38-30