Mazda CX-9 Grand Touring. Manual — part 128

DIAGNOSTIC PROCEDURE

DIAGNOSTIC PROCEDURE

4

ABS or TCS* operates frequently./TCS* does not work correctly.
*: DSC/RSC system function contains traction control function; DSC indicator light goes on and
off while DSC/RSC is operating.

[TROUBLESHOOTING HINTS]



There is a difference in size or air pressure between the front and rear tires



Incorrect ABS wheel-speed signal is input to DSC/RSC HU/CM



There is a malfunction in the engine control system (TCS malfunction)



Tire problem (low or high air pressure, excessive wear, different grip level by four wheels)

STEP

INSPECTION

ACTION

1

INSPECT DTCS IN
DSC/RSC HU/CM



Inspect the DTC for the
ON-BOARD
DIAGNOSTIC
SYSTEM.



Have DTCs been stored
in memory?

Yes

Perform the applicable DTC inspection.
(See ON-BOARD DIAGNOSIS [DSC/RSC] .)

No

Go to the next step.

2

INSPECT TIRE SIZE AND
AIR PRESSURE



Inspect the tire size and
the air pressure.



Are size and air pressure
as specified?

Yes Go to the next step.

No

Replace with specified tires and adjust tire air pressure.

3

INSPECT ABS WHEEL-
SPEED SENSOR OUTPUT
VALUE



Inspect the output value
from the ABS wheel-
speed sensor.

(See FRONT ABS WHEEL-
SPEED SENSOR
INSPECTION .)
(See REAR ABS WHEEL-
SPEED SENSOR
INSPECTION [2WD] .)

Yes Go to the next step.

No



ABS wheel-speed sensor installation inspection: Inspect

the sensor for looseness and verify that it is securely

installed.



Sensor rotor installation inspection: Inspect the sensor
rotor for poor installation and chipping of sensor rotor

teeth. (If sensor rotor is installed poorly, it may cause

2008 Mazda CX-9 Grand Touring

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 9:41:34 AM

Page 11

© 2005 Mitchell Repair Information Company, LLC.

NO.5 DSC OPERATES FREQUENTLY/DSC DOES NOT WORK CORRECTLY
[DSC/RSC]

TROUBLESHOOTING CHART

DIAGNOSTIC PROCEDURE

DIAGNOSTIC PROCEDURE

(See REAR ABS WHEEL-
SPEED SENSOR
INSPECTION [AWD] .)



Is the output value
normal?

output of abnormal wave form at high speed.)

4

VERIFY THAT TIRE
CONDITION



Verify tire condition for
following:



Wear



Grip level
(different by four
wheels)



Are tires condition okay?

Yes

Find malfunctioning part according to "INTERMITTENT
CONCERN TROUBLESHOOTING".

No

Adjust, repair or replace tire.

5

DSC* operates frequently. /DSC* does not work correctly.
*: DSC/RSC system contains dynamic stability control function; DSC indicator light illuminates
and goes out and while DSC/RSC is operating.

[TROUBLESHOOTING HINTS]



DSC/RSC HU/CM detected malfunction (input and output device malfunction)



Poor installation of combined sensor and/or steering angle sensor

(If any of the above sensors are poorly installed, DSC/RSC may operate intermittently)



When replacing the DSC/RSC HU/CM, or combined sensor, initialization is not performed.

(If initialization is not performed correctly, DSC/RSC may not work correctly)

STEP

INSPECTION

ACTION

1

INSPECT DSC/RSC HU/CM FOR DTCs



Inspect the DTC for the ON-BOARD
DIAGNOSTIC SYSTEM.

Yes

Perform the applicable DTC inspection. (See
ON-BOARD DIAGNOSIS [DSC/RSC] .)

2008 Mazda CX-9 Grand Touring

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 9:41:34 AM

Page 12

© 2005 Mitchell Repair Information Company, LLC.

NO.6 RSC OPERATES FREQUENTLY/RSC DOES NOT WORK CORRECTRY
[DSC/RSC]

TROUBLESHOOTING CHART

DIAGNOSTIC PROCEDURE

DIAGNOSTIC PROCEDURE



Have DTCs been recorded in memory? No

Go to the next step.

2

VERIFY THAT EACH SENSOR IS
INSTALLED



Are the combined sensor and steering
angle sensor securely installed?

Yes Go to the next step.

No

Install sensor securely.

*3

VERIFY THAT EACH SENSOR IS
INITIALIZED



Was initialization performed after
replacement of the DSC/RSC HU/CM,
or combined sensor?

Yes Go to the next step.

No

Perform initialization procedure. (See

DSC/RSC SENSOR INITIALIZATION

PROCEDURE .)

4

VERIFY THAT TIRE CONDITION



Verify tire condition for following:



Air pressure



Wear



Grip level (different by four
wheels)



Are tires condition okay?

Yes

Find malfunctioning part according to
"INTERMITTENT CONCERN
TROUBLESHOOTING".

No

Adjust, repair or replace tire.

6

RSC* operates frequently/RSC* does not work correctly
*: DSC/RSC system contains roll stability control function; DSC indicator light illuminates and
goes out and while DSC/RSC is operating.

[TROUBLESHOOTING HINTS]



DSC/RSC HU/CM detected malfunction (input and out put devise malfunction)



Poor installation of combined sensor and/or steering angel sensor (If any of the above sensors are
poorly installed, DSC/RSC may operate intermittently)



When replacing the DSC/RSC HU/CM, or combined sensor, initialization is not performed (If
initialization is not performed correctly, DSC/RSC may not work correctly)



Tire problem (low or high air pressure, excessive tire wear, different grip level for four wheels)



Poor installation or malfunction suspension parts (shock absorber, stabilizer)

STEP

INSPECTION

ACTION

2008 Mazda CX-9 Grand Touring

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 9:41:34 AM

Page 13

© 2005 Mitchell Repair Information Company, LLC.

1

INSPECT DTC IN DSC/RSC HU/CM



Inspect DTC for the ON-BOARD
DIAGNOSTIC SYSTEM.



Have DTCs been stored in memory?

Yes

Perform the applicable DTC inspection (See
ON-BOARD DIAGNOSIS [DSC/RSC] .)

No

Go to the next step.

2

VERIFY THAT EACH SENSOR IS
INSTALLED



Are the combined sensor and steering
angle sensor securely installed?

Yes Go to the next step.

No

Install the suspect sensor securely.

3

VERIFY EACH SENSOR IS
INITIALIZED



Was initialized performed after
replacement of the DSC/RSC HU/CM
or combined sensor?

Yes Go to the next step.

No

Perform initialization procedure. (See

DSC/RSC SENSOR INITIALIZATION

PROCEDURE .)

4

VERIFY THAT TIRE CONDITION



Verify tire condition for following:



Air pressure



Wear



Grip level (different by four wheels)



Are tires conditions okay?

Yes Go to the next step.

No

Adjust, repair or replace suspect tire.

5

VERIFY SUSPENTION PART



Verify vehicle posture.



Is there an inclination in the posture of
the vehicle right and left, left and rear?

Yes

Inspect the following suspension part:



Shock absorber



Stabilizer

No

Find malfunctioning part according to

"intermittent concern troubleshooting".

2008 Mazda CX-9 Grand Touring

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 9:41:34 AM

Page 14

© 2005 Mitchell Repair Information Company, LLC.