3308631 - F31 TRACTION CONTROL SYSTEM NOT WORKING - TCS

During strong acceleration, the front wheels skid, even with the TCS lamp on the instrument panel flashing.
Results of the tests
1CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect diagnostic equipment (Examiner or other instruments) to the diagnostic socket.

Verify:

  • that there are no faults in the ABS control unit
  • the plausibility of all the parameters
Continue to Step 2 An error is detected in the control unit Continue following the instructions for the diagnostic equipment
Lack of dialogue with the control unit Restore the connection between the ABS control unit and diagnostic connector ( See   E7020  ABS )
2ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation

Using the diagnostic equipment (Examiner or other iinstruments) carry out the active diagnosis of:

  • pump motor
  • solenoid valves
Continue to Step 3 Pump and/or solenoids faulty Replace electrohydraulic unit-electronic control unit Op.   3340A12 
3CHECK PAD TYPE AND SURFACEAll OKProblems metOperation

Verify:

  • condition of pad friction surfaces
  • pad type
Continue to Step 4 Friction surfaces vitrified or with traces of oil or greaseClean and eliminate the causes of the problem
Front pads damaged or wrong type Replace front pads Op.   3310A60 
4CHECK DISCSAll OKProblems metOperation
Check the condition of the brake discs Continue to Step 5 Front discs worn or damaged Skim or if necessary replace front discs Op.   3310A48 
5CHECKING BRAKE CALIPERSAll OKProblems metOperation
Check that the brake caliper pistons run freely Continue to Step 6 Front caliper pistons seized Replace front brake calipers Op.   3310A30 
6CHECK BRAKE PIPES/HOSES AND BLEEDINGAll OKProblems metOperation
Visually check that there are no kinks or restrictions in the brake pipes, bleed the system and check that fluid emerges from the bleed screws as normal Continue to Step 7 There are kinks or restrictions, fluid does not come out normallyReplace the faulty section of pipe
7HECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'