Mazda Training manual - part 80

Dynamic Driving Safety Systems 

Introduction 

Introduction 

• 

Recent decades have witnessed an ongoing series of advances in driving safety and 
comfort of automotive suspension. But ever-higher engine power and growing traffic 
volume have led to an increasing demand to improve the active driving safety of 
automobiles. However, a consistent stability in critical driving situations had to wait until 
advent of electronic control systems.  

• 

The ever increasing use of electronics in vehicle systems has led to highly precise and 
miniaturized sensors that can exactly detect dynamic forces created during acceleration, 
deceleration, and cornering. These sensors and an appropriate electronic control system 
have been the crucial prerequisite for the development of dynamic driving safety 
systems that help the driver maintain vehicle control in critical driving situations.  

• 

Although the dynamic driving safety systems offer a huge advantage for the passenger 
safety, it should be remembered that the extended driving safety does not extend the 
physical limitations valid for all vehicles.  

• 

The following dynamic driving safety systems are used on current Mazda models and 
will be described in this training manual:  

– 

Antilock Brake System (ABS)  

– 

Electronic Brakeforce Distribution (EBD)  

– 

Traction Control System (TCS)  

– 

Dynamic Stability Control (DSC)  

– 

Emergency Brake Assist (EBA)  

• 

The skills needed to diagnose and repair dynamic driving system related concerns 
require comprehensive system knowledge, because any mistake can lead to 
malfunctions on the brake system and consequently affect the passenger’s safety. This 
course is a theoretical and practical guide to gain general and Mazda specific knowledge 
about the various driving dynamics safety systems, i.e. their components, function and 
diagnosis. 

• 

Any person involved in the diagnosis and repair of the dynamic driving safety system 
must have the knowledge to deliver a “Fix it right first time” repair. The Mazda Masters 
Development and Qualification path provides the following training course required for 
the service on the dynamic driving safety system. 

– 

Dynamic Driving Safety Systems CT-L 2003 

• 

The ranking of this course within the Mazda Masters educational system is Level 2 – 
‘Senior Technician’. It is focused on technicians who have passed the ‘Mazda 
Technician’ level already. 

 
 
 

Curriculum Training 

00-1 

Introduction 

Dynamic Driving Safety Systems 

• 

The training manual “Driving Dynamic Safety Systems” is divided into the following main 
chapters: 

– 

Introduction 

– 

Fundamentals 

– 

Antilock Brake System 

– 

Electronic Brakeforce Distribution 

– 

Traction Control System 

– 

Dynamic Stability Control 

– 

Emergency Brake Assist  

 
NOTE:  The data, tables and procedures represented in this training manual serve only as 

examples. They are taken from the service literature and subjected to major or minor 
changes over the course of time. To prevent any misdiagnosis always refer to the 
current service literature while working on the driving dynamic safety system. 

 
 

00-2 Curriculum 

Training 

Dynamic Driving Safety Systems 

Fundamentals 

Fundamentals 

• 

Various forces, that constantly change depending on the driving situation, determine the 
driving stability of a normal passenger vehicle. Whether or not these forces are properly 
transferred to the road completely depends on the four contact areas of the tyres; each 
one barely the size of a postcard! The key for this transfer is the right amount and type of 
friction between tyre and road surface. In the event the traction between tyre and road 
surface is lost, because the affecting forces have exceeded an appropriate limit, the 
vehicle handling becomes instable.  

• 

The dynamic driving safety systems monitor specific parameters that indicate an 
impending traction loss of the wheels or vehicle skidding. In case of such situations the 
respective system counteracts this development by modulating either the brake pressure 
and / or the engine torque to maintain the vehicle stability.  

 
 

Curriculum Training 

01-1 

Fundamentals 

Dynamic Driving Safety Systems 

Forces Acting on the Vehicle 

• 

A large number of forces act on a vehicle during driving. The forces most important for 
understanding the dynamic driving system are shown in the illustration below. 

 

 

L2003_01001 

 

1  Yaw moment 

4  Vertical force 

2  Longitudinal drive force 

5  Longitudinal brake force 

3 Lateral 

force 

  

 
 

01-2 Curriculum 

Training