Mazda Training manual - part 93

Dynamic Driving Safety Systems 

TCS 

Traction Control System 

• 

The TCS (Traction Control System) is installed on most Mazdas with ABS to ensure 
good traction for the driven wheels. 

• 

Some earlier systems used only engine torque reduction through fuel cut-off and ignition 
timing control for TCS operation, others used only brake control. This course 
emphasizes systems installed on most current Mazda vehicles. It reduces engine torque 
and/or applies brake pressure to the spinning wheel, as needed. 

• 

The system is incorporated into the ABS HU/CM. The TCS features the following 
changes in components over an ABS: 

– 

Two traction solenoid valves are added to the HU/CM. 

– 

A TCS OFF switch is added to the dashboard. 

– 

A TCS OFF indicator light and a TCS indicator light are included in the IC. 

– 

The CM can send a torque reduction signal to the PCM when required. 

 
 

Curriculum Training 

02-31 

TCS 

Dynamic Driving Safety Systems 

TCS Control Module 

Wiring Diagram 

 

L2003_02019 

Mazda6 

 

02-32 Curriculum 

Training 

Dynamic Driving Safety Systems 

TCS 

 

1 ABS 

fuse 

13 Battery 

2 

Brake system warning light 

14 

ABS wheel-speed sensor LR 

3 

ABS warning light 

15 

ABS wheel-speed sensor RR 

4 

IC 

16 

ABS wheel-speed sensor LF 

5 

CAN driver 

17 

ABS wheel-speed sensor RF 

6 

TCS OFF indicator light  

18 

Ignition switch 

7 

TCS indicator light  

19 

ABS ignition fuse 

8 PCM 

20 Solenoid 

valves 

9 

BCM 

21 

ABS pump motor 

10 

TCS OFF switch 

22 

CAN H 

11 DLC-2 

23 CAN 

L 

12 ABS/TCS 

HU/CM 

  

 

Hydraulic Circuit 

• 

The HU for TCS is equipped with 10 solenoid valves that can be activated for the ABS, 
and TCS operation. It has two more solenoid valves than a vehicle with four channel 
ABS. The additional valves are the traction control solenoid valves, which are open when 
not actuated by the CM. One valve is used for each brake circuit. They are in line with 
the brake master cylinder and the inlet solenoid valves in the HU. This ensures that the 
brake circuit can be separated from the brake master cylinder during TCS operation. 

 

LF-RR

OFF (open)

RF-LR

OFF (open)

LF

OFF (open)

RF

OFF (open)

LR

OFF (open)

RR

OFF (open)

LF

OFF (closed)

RF

OFF (closed)

LR

OFF (closed)

RR

OFF (closed)

Pump motor

OFF (closed)

L2003_T02008

Traction control solenoid valve

Inlet solenoid valve

Outlet solenoid valve

 

 
 

Curriculum Training 

02-33 

TCS 

Dynamic Driving Safety Systems 

Hydraulic Diagram 

 

L2003_02020 

 

1 

Master cylinder 

8 

Inlet solenoid valve 

2 

ABS/TCS HU/CM 

9 

Outlet solenoid valve 

3 

Traction control solenoid valve LF/RR 

10 

Brake calliper LF 

4 

Damper chamber 

11 

Brake calliper RR 

5 

Pump motor 

12 

Brake calliper LR 

6 

Pump 

13 

Brake calliper RF 

7 

Reservoir 

14 

Traction control solenoid valve RF/LR 

 
 

02-34 Curriculum 

Training