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29 Jun. 2009


    Detailed description of the ABS/TC systems Seminar 2 days (1day / week)



    • ABS and Traction Control, general
      - Historic background information.
      - Over view of various systems incorporated into a modern ABS(/TC) system.


    • Tyre grip in relation to ABS
      - Effects of the road surface in relation to the brake force.
      - Maximum deceleration and design parameters
      - Simple Brake force calculation


    • ABS Front wheel sensor
      - First generation inductive wheel sensors.
      - How the signal is built up.
      - Diagnostics on wheel sensor signals (various faults).
      - Next generation sensors, front wheel sensor, stator and rotor wheel sensor.
      - Diagnostics on next generation sensors.


    • ABS Rear wheel sensor
      - Construction of the rear wheel sensor (older and new types).
      - Repairs on sensors.
      - Diagnostics on sensors on later models.


    • ABS Master cylinder
      - Principles of the ABS Master cylinder and system layout.
      - Mechanical fail safe system in the master cylinder and the effect on the ABS system.


    • ABS Hydraulic pump and control motor
      - Functioning of the ABS (/TC) Hydraulic pump unit.
      - Action description step by step.


    • ABS pressure chambers
      - The Pressure chamber.
      - The Drain chamber.


    • ABS NO (Normally Open) Actuator valve
      - Construction.
      - Electronic actuation.
      - Fluid pressure and force.
      - Diagnostics (ECU) and repair.
      - Bad electronic connections.
      - Mechanical diagnostics.


    • ABS NC (Normally closed) Actuator valve
      - Construction
      - Description of actuation
      - Diagnostics (ECU) and repair.
      - Mechanical diagnostics.


    • ABS brake switch
      - Role and function of the ABS brake switch.
      - Wiring diagram brake switch (ECU internal and external) and trigger levels.
      - Diagnostics of the ABS brake switch.


    • Information on the ABS Hydraulic diagram.
      - The ABS Hydraulic diagram
      - Normal and limp home mode operation.
      - Depressurising under braking conditions.
      - Pressurising under braking conditions.
      - Continuous correction.


    • ABS Slave Cylinders
      - Construction of the ABS Slave Cylinders
      - Bleeding of the ABS Slave Cylinders


    • Brake fluid
      - Viscosity
      - Hygroscopic
      - Service intervals
      - Different types of brake fluid


    • Traction Control (TC)
      - Tyre grip
      - Actuation
      - Normal and limp home mode
      - Applying brake pressure to reduce wheel skid


    • Engine Torque reduction.
      - How Engine Torque Reduction is achieved on Petrol and Diesel engines.


    • Questions
      - Chapter related questions. Most questions are not directly answered in the manual.

    The ABS/TC systems training seminar is both hands on and theory. The hands on, is on system wiring diagrams (breakout boxes) and on a real working ABS/TC system. The '99 Bosch V5.3 used is a very common and copied system and is in our view the most used system (of this generation) on NZ roads.

    Pre requisite: From our experience we advise that the diagnostician has completed the AED 'Automotive Electronic Diagnostic' 2 day training seminar, regardless achieved level through other training systems or experience!

    Please note: the seminar is SCOPE based. Signals referred to are scope signals.
    The diagnostician can bring his (hers) own scope, or our dual channel scopes (ATS) can be used. Particularly with immobiliser diagnostics a VERY fast scope is needed (25 MS/sec or more).



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