38C-68
MR-413-X44-38C000$940_eng.mif
V1
MK70 ABS
Vdiag No: 04ANTI-LOCK BRAKING SYSTEM
Fault finding - Fault Finding Chart38C
ALP 3 Pull
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
Check the conformity of the mechanical components.
Disconnect one wheel speed sensor.
Start the engine and ensure that only the ABS
system fault warning light comes on. Do not drive
the vehicle if the brake fault warning light is also lit,
as the "EBD" (brake limiter) function is no longer
ensured.
Carry out a road test with the ABS thus out of order.
Is the customer complaint still present under
these conditions?
NO
Raise the vehicle so that you can rotate the wheels
and check:
–Possible inversion when connecting the speed
sensors.
–Possible inversion of pipes on the hydraulic unit.
For these two tests, refer to and apply the
procedures described in ALP 2.
Check the condition and conformity of the ABS
targets.
If necessary, replace the targets.
If the fault is still present replace the hydraulic unit.
YESIf 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.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_ALP3
38C-69
MR-413-X44-38C000$940_eng.mif
V1
MK70 ABS
Vdiag No: 04ANTI-LOCK BRAKING SYSTEM
Fault finding - Fault Finding Chart38C
ALP 4 Drift
NOTESOnly consult 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
system fault warning light comes on. Do not drive
the vehicle if the brake fault warning light is also lit,
as the "EBD" (brake limiter) function is no longer
ensured.
Carry out a road test with the ABS thus out of order.
Is the customer complaint still present under
these conditions?
NO
Normal behaviour linked to the system operation
during the regulation phase, mainly on surfaces with
uneven grip or which are poorly laid.
YESRoad 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.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ABS_V04_ALP4
