Page 46 of 57
38C-46
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
ALP1
CONTINUED
Check that the diagnostic socket, component code 225 is correctly supplied:
–+ before ignition feed on connection BP10 of component 225.
–+ after ignition feed on connection AP10 of component 225.
–Earth on connections MK and NA of component 225.
If the connection or connections are faulty and if there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If dialogue has still not been established after these checks, contact the techline.
A
Page 47 of 57

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
Page 53 of 57
38C-53
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
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 has been correctly installed without modification to the original wiring, particularly that
of the ABS (unauthorised earth and + after ignition feed connections on the ABS).
ABS8.1X76_V18_ALP7
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