2427486 - F20 ABS WORKING IRREGULARLY

The system is not working properly.
Results of the tests
1CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the Examiner to the diagnostic connector and check the following at the brake node

In errors ambient:

  • that there are no faults

In parameter mode

  • the plausibility of all the parameters.

In active diagnosis mode:

  • operation of ABS warning light
Continue to Step 2Presence of errors at the vehicle speed sensorsCheck the wiring for the wheel speed sensor concerned, making sure that there are no loose connections and that the sensor is correctly positioned
Presence of other faultsContinue according to the instructions for the diagnostic equipment
The warning light does not come on Change the brake system control unit
2CHECKING BRAKE HYDRAULIC SYSTEMAll OKProblems metOperation
Disconnect the ABS electrical connection and test the efficiency of the braking system with the aid of a service rig. Continue to Step 3Braking action not balancedOverhaul the braking system
3CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer present
the test is essential, as the braking system is a safety feature of the car
End of diagnosisFault persists Replace the brake system hydraulic unit