Mazda 6. Manual — part 260

P–96

ON-BOARD DIAGNOSTIC (DYNAMIC STABILITY CONTROL)

DTC U2021

A6E697367650W22

Note

• To warm up the engine completely, idle the engine and wait for more than 5 minutes.

Diagnostic procedure

End Of Sie

DTC

U2021

Engine coolant temperature

DETECTION

CONDITION

• After engine is warmed up, engine coolant temperature is 0 °C {32 °F} or less, and TCS operation is

inhibited by PCM.

POSSIBLE

CAUSE

• System is normal. When engine coolant temperature rises, TCS operation is executed by PCM.

STEP

INSPECTION

ACTION

1

CHECK WHETHER ENGINE HAS WARMED
UP

• Has engine warmed up?

Yes

Go to next step.

No

Warm up the engine.
If DSC OFF light goes out, system is normal.

2

VERIFY THAT MALFUNCTION SYMPTOM
OCCURS AFTER ENGINE IS WARMED UP

• Warm up the engine.

• Is DSC indicator light also illuminated and

DTC C1119 obtained?

Yes

Go to DTC C1119 chart.

No

If DSC OFF light goes out, system is normal.
If DSC OFF light does not go out, go to next step.

3

VERIFY TROUBLESHOOTING COMPLETED

• Clear DTC from memory.

(See

P–46 Clearing DTCs Procedures

)

• Is same DTC present?

Yes

Replace DSC HU/CM, then go to next step.

No

Go to next step.

4

VERIFY AFTER REPAIR PROCEDURE

• Is there any other DTC present?

Yes

Go to applicable DTC inspection.

No

Troubleshooting completed.

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)

P–97

P

SYSTEM WIRING DIAGRAM

A6E699067650W01

ABS (ABS/TCS)

.

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)

A6E6921T001

1

IG switch

2

SUS 15 A fuse

3

ABS 60 A fuse

4

Meter

5

ABS warning light

6

Brake system warning light

7

TCS OFF light

8

TCS indicator light

9

CAN driver

10

Brake light

11

Cruise actuator

12

TCS OFF switch

13

DLC-2

14

CAN-H

15

CAN-L

16

ABS Wheel-speed sensor

17

Battery

18

Brake switch

19

Audio unit, Wiper and washer switch, Car-navigation
unit, Auto leveling control unit

P–98

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)

DSC

.

A6E6920T005

1

IG switch

2

SUS 15A fuse

3

ABS 60 A fuse

4

Meter

5

ABS warning light

6

Brake system warning light

7

DSC OFF light

8

DSC indicator light

9

CAN driver

10

Battery

11

Cruise actuator

12

DSC OFF switch

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)

P–99

P

End Of Sie

FOREWORD

A6E699067650W02

• Before performing the steps in Symptom Troubleshooting, perform the On-board Diagnostic Inspection. To

check the DTC, follow the DTC Inspection steps.

End Of Sie

PRECAUTION

A6E699067650W03

Vehicles with ABS/TCS

1. The ABS warning light, BRAKE system warning light, TCS indicator light and/or TCS OFF light illuminate even

when the system is normal.

*

1 : In cases where the light may illuminate, only when ABS/TCS HU/CM detects that speed sensor of rear wheel

is malfunctioning.

*

2 : If battery voltage drops below 9 V while vehicle speed is greater than 6 km/h{3.7mph}, ABS HU/CM records

DTC B1318.

13

DLC-2

14

CAN-H

15

CAN-L

16

Wheel-speed sensor

17

Combine sensor

18

Steering angle sensor

19

Brake switch

20

Brake light

21

Back-up light switch (MTX only)

22

Back-up light

23

Audio unit, Wiper and washer switch,
Car-navegation unit, Auto leveling control unit

Warning lights that may
illuminate and/or flash

Cases in which the light may
illuminate

Conditions in which the
light will go out

ABS, EBD, TCS and DSC
control

Any or all the following light(s)
illuminate:

• ABS warning light

• BRAKE system warning

light(

*1

)

Under any of the following
conditions:

• When the front wheels are

jacked up, stuck, or placed
on a chassis roller, and
only the front wheel ABS
wheel speed sensors are
spun for more than 60
seconds.

After turning ignition switch
OFF, vehicle is driven at
speed greater than 10 km/h
{6.2 mph} and normal
operation is confirmed.

• ABS: Cuts control.

• EBD:

1. Cuts control, in cases

where the light may
illuminate, only when ABS
CM detects that a wheel
speed sensor determines
that more than the two rear
wheels are malfunctioning.

2. Operates control, if wheel

speed sensor determines
that more than 3 wheels
are functioning correctly.

Parking brake is not fully
released while driving.

Brake drag.

Sudden acceleration/
deceleration.

Left/right or front/rear tires are
different. (Size, radius, tire
pressure, or wear is other than
that listed on tire label.)

All the following lights
illuminate:

• ABS warning light

• BRAKE system warning

light

Battery voltage at ABS-TCS
HU/CM ignition terminal Z
drops below about 9 to 10
V.(

*2

)

Battery voltage rises abobe
about 10 V.
(Only BRAKE system warning
light goes out.)

ABS: Operates control.
EBD: Operates control.