Mazda CX-9 Grand Touring. Manual - part 122

DIAGNOSTIC PROCEDURE 

DTC C1233, C1234, C1235, C1236 [DSC/RSC] DIAGNOSTIC PROCEDURE 

DETECTION 

CONDITION 

abnormal acceleration that exceeds specification.  



Periodic abnormality is detected in the signal wave pattern from the ABS 
wheel-speed sensors.  

POSSIBLE CAUSE 



ABS wheel-speed sensor malfunction (low output, metal shavings on 
sensor)  



ABS sensor rotor malfunction (chipping of sensor rotor teeth)  



Poor installation of ABS wheel-speed sensor and/or sensor rotor  



Excessive clearance between the ABS wheel-speed sensor and sensor rotor 

STEP

INSPECTION

ACTION

1

INSPECT PID FOR ABNORMAL 
OUTPUT FROM ABS WHEEL-SPEED 
SENSOR USING M-MDS  



Turn the ignition switch off.  



Connect the M-MDS to the DLC-2.  



Select the following PIDs using the 
M-MDS: 

WSPD_LF 

WSPD_LR 

WSPD_RF 

WSPD_RR 



Start the engine and drive the vehicle. 



Verify that the PIDs of the four ABS 
wheel-speed sensors correspond 
approximately.  



Do the vehicle speeds correspond?  

Yes Go to Step 4.

No

If there is a difference in speeds of the four 

wheels, go to the next step.

INSPECT IF MALFUNCTION 
OCCURRED DUE TO IMPROPER 
SENSOR CLEARANCE.  



Inspect the clearance between the 
ABS wheel-speed sensor and the 
ABS sensor rotor. 

Yes Go to the next step.

 

2008 Mazda CX-9 Grand Touring 

2008 BRAKES On-Board Diagnostic (DSC/RSC) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 9:50:13 AM

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© 2005 Mitchell Repair Information Company, LLC. 

2

(See FRONT ABS WHEEL-
SPEED SENSOR INSPECTION .) 

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

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



Is the clearance normal? 

Clearance  

Front: 0.7-1.5 mm {0.028-0.059 in}  

Rear (2WD): 0.3-1.1 mm {0.012-
0.043 in}  

Rear (AWD): 0.95-1.75 mm {0.038-
0.068 in}  

No

Replace the ABS wheel-speed sensor, then go to 

Step 4. 

(See FRONT ABS WHEEL-SPEED SENSOR 

REMOVAL/INSTALLATION .) 

(See REAR ABS WHEEL-SPEED SENSOR 

REMOVAL/INSTALLATION [2WD] .) 

(See REAR ABS WHEEL-SPEED SENSOR 

REMOVAL/INSTALLATION [AWD] .)

3

VISUALLY INSPECT ABS SENSOR 
ROTOR FOR FOREIGN MATERIAL 
ADHERING OR IMPROPER 
INSTALLATION  



Is the result normal?  

Yes Go to the next step.

No

Replace the front drive shaft, rear wheel hub 

component (2WD) or rear drive shaft (AWD), 

then go to the next step. 

(See FRONT DRIVE SHAFT 

REMOVAL/INSTALLATION .) 

(See WHEEL HUB COMPONENT 

REMOVAL/INSTALLATION [2WD] .) 

(See REAR DRIVE SHAFT 

REMOVAL/INSTALLATION .)

4

VERIFY THAT THE SAME DTC IS 
NOT PRESENT  



Clear the DTC from the memory. 

(See ON-BOARD DIAGNOSTIC 
[DSC/RSC].) 



Start the engine and drive the vehicle 
at 10 km/h {6.2 mph} or more.  



Are the same DTCs present?  

Yes

Repeat the inspection from Step 1. 
If the malfunction recurs, replace the DSC/RSC 
HU/CM, then go to the next step. 
(See DSC/RSC HU/CM 
REMOVAL/INSTALLATION .)

No

Go to the next step.

5

VERIFY THAT NO OTHER DTCS 
ARE PRESENT  



Are any other DTCs output?  

Yes

Go to the applicable DTC inspection. 
(See ON-BOARD DIAGNOSTIC [DSC/RSC].)

No

DTC troubleshooting completed.

 

2008 Mazda CX-9 Grand Touring 

2008 BRAKES On-Board Diagnostic (DSC/RSC) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 9:50:13 AM

Page 30 

© 2005 Mitchell Repair Information Company, LLC. 

DTC C1278, C1295, U2023 [DSC/RSC]

DTC C1278, C1295, U2023 [DSC/RSC] DETECTION CONDITION AND POSSIBLE CAUSE 

DIAGNOSTIC PROCEDURE 

DTC C1278, C1295, U2023 [DSC/RSC] DIAGNOSTIC PROCEDURE 

DTC C1288 [DSC/RSC] 

DTC C1288 [DSC/RSC] DETECTION CONDITION AND POSSIBLE CAUSE 

DTC C1278, C1295, U2023 Steering angle sensor system

DETECTION CONDITION 



C1278 



The steering angle sensor detects an abnormality in the signal. 



C1295, U2023 



The steering angle sensor detects an internal abnormality.  

POSSIBLE CAUSE 



Steering angle sensor malfunction  



Poor connection at connectors (female terminal)  

STEP

INSPECTION

ACTION

1

INSPECT FOR BCM MALFUNCTION  



Turn the ignition switch off.  



Using the M-MDS, perform the DTC 
inspection for the BCM.  



Are any DTCs detected?  

Yes

Go to applicable DTC inspection. 
(See DTC TABLE [BCM] .)

No

Go to the next step.

2

VERIFY DTC TROUBLESHOOTING 
COMPLETED  



Clear the DTC from the memory. 

(See ON-BOARD DIAGNOSTIC 
[DSC/RSC].) 



Are the same DTCs present?  

Yes

Replace the DSC/RSC HU/CM, then go to the 
next step. 
(See DSC/RSC HU/CM 
REMOVAL/INSTALLATION .)

No

Go to the next step.

3

VERIFY AFTER REPAIR PROCEDURE 



Are any other DTCs present?  

Yes

Go to the applicable DTC inspection. 
(See ON-BOARD DIAGNOSTIC 
[DSC/RSC].)

No

DTC troubleshooting completed.

DTC C1288

Brake fluid pressure sensor system

DETECTION 

CONDITION 



The pressure from the brake fluid pressure sensor when the system starts 
up is not within specification.  



Open or short circuit in the brake fluid pressure sensor circuit in the 

 

2008 Mazda CX-9 Grand Touring 

2008 BRAKES On-Board Diagnostic (DSC/RSC) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 9:50:13 AM

Page 31 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC C1288 [DSC/RSC] DIAGNOSTIC PROCEDURE 

DTC C1327 [DSC/RSC] 

POSSIBLE CAUSE 

DSC/RSC HU/CM  



Malfunction in the brake fluid pressure sensor  



Conventional brake system malfunction  

STEP

INSPECTION

ACTION

1

INSPECT CONVENTIONAL BRAKE 
SYSTEM  



Inspect the conventional Drake system for 
the following: 



Normal master cylinder operation  



Brake fluid leakage between the 
master cylinder and DSC/RSC 
HU/CM  



Normal brake switch operation  



Is the conventional brake system normal? 

Yes Go to the next step.

No

Replace the malfunctioning part, then go to 

the next step.

2

INSPECT BRAKE FLUID PRESSURE 
SENSOR  



Inspect the brake fluid pressure sensor. 

(See BRAKE FLUID PRESSURE 
SENSOR INSPECTION .) 



Is the brake fluid pressure sensor normal? 

Yes Go to the next step.

No

Replace the DSC/RSC HU/CM, then go to 

the next step. 

(See DSC/RSC HU/CM 

REMOVAL/INSTALLATION .)

3

VERIFY NO ABNORMALITY ON BRAKE 
FLUID PRESSURE SENSOR  



Clear the DTCs from the memory. 

(See ON-BOARD DIAGNOSTIC 
[DSC/RSC].) 



Are the same DTCs present?  

Yes

Replace the DSC/RSC HU/CM, then go to 
the next step. 
(See DSC/RSC HU/CM 
REMOVAL/INSTALLATION .)

No

Go to the next step.

4

VERIFY THAT NO OTHER DTCS ARE 
PRESENT  



Are any other DTCs output?  

Yes

Go to the applicable DTC inspection. 
(See ON-BOARD DIAGNOSTIC 
[DSC/RSC].)

No

DTC troubleshooting completed.

 

2008 Mazda CX-9 Grand Touring 

2008 BRAKES On-Board Diagnostic (DSC/RSC) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 9:50:13 AM

Page 32 

© 2005 Mitchell Repair Information Company, LLC.