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