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).
