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.