WORKING ON THE ABS/PBS SYSTEM
Page : 25
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Incidents which cannot be detected by the ECU
These incidents are not detected by the ECU and do not show a fault code.
Loss of braking pressure, brake lever soft: (warning light off)
Checks:
-
Check the brake fluid level in the levers
-
Check operation of the conventional part of the brakes, calipers, pads, unions, etc
-
Check the brake fluid level in the control unit reservoir
-
Bleed the brake system and check there is no air in the circuit
-
Check the electrical power supply to the control unit, battery charge, harness connections, etc
if the checks prove OK and the fault persists, change the control unit
Harsh and non-progressive braking: (warning light off)
-
Change the control unit
Warning light does not go off at a speed of over 5 km/h but goes off after braking and no fault code: (warning
light on)
Checks:
-
Check the right and left contactors
-
Check the brake contactor harness, continuity, isolation
-
Check the warning light harness, continuity, isolation
-
Check the speed sensor, wrong gap, pulse wheel distorted, sensor faulty, etc
-
Check the control unit electric motor, terminal 15 and terminal 18
If these checks prove OK and the fault persists, change the control unit
Warning light does not go off at a speed of over 5 km/h even after braking and no fault code: (warning light
on)
Checks:
-
Check the right and left contactors
-
Check the brake contactor harness, continuity, isolation
-
Check the warning light harness, continuity, isolation
If these checks prove OK and the fault persists, change the control unit
Electric pump operates permanently with no effect on brakes: (warning light on)
Checks:
-
Cut off the ignition and turn on again
-
Check the right and left contactors
-
Check the brake contactor harness, continuity, isolation
-
Check the warning light harness, continuity, isolation
-
Check the speed sensor, wrong gap, pulse wheel distorted, sensor faulty, etc
-
Check the control unit electric motor, terminal 15 and terminal 18
If these checks prove OK and the fault persists, change the control unit