Mazda CX-9 Grand Touring. Manual - part 120

DTC C1115, C1185 [DSC/RSC] 

DTC C1115, C1185 [DSC/RSC] DETECTION CONDITION AND POSSIBLE CAUSE 

DIAGNOSTIC PROCEDURE 

DTC C1115, C1185 [DSC/RSC] DIAGNOSTIC PROCEDURE 

6

PROCEDURE  



Are any other DTCs present?  

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

No

DTC troubleshooting completed.

NOTE:



Perform the inspection of DTCs other than C1115 and C1185 first when 
verifying DTCs.  

DTC C1115, C1185

Valve relay system

DETECTION 

CONDITION 



C1115 



Short circuit in the DSC/RSC HU/CM internal value relay.  



C1185 



Open circuit in the DSC/RSC HU/CM internal value relay.  

POSSIBLE CAUSE 



Open or short circuit in the DSC/RSC HU/CM internal valve relay, or 
stuck valve relay  

STEP

INSPECTION

ACTION

1

VERIFY DTC INSPECTION  



Turn the ignition switch off.  



Using the M-MDS, perform the 
DTC inspection.  



Are any DTCs other than C1115 
and C1185 output?  

Yes

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

No

Go to the next step.

2

VERIFY CURRENT STATUS OF 
MALFUNCTION  



Clear the DTC from the memory. 

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



Is the same DTC 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 THAT NO DTCS ARE 
OUTPUT AGAIN  



Drive the vehicle at 32 km/h or 

Yes If DTC C1115 or C1185 is output again, replace the 

DSC/RSC HU/CM. 
(See DSC/RSC HU/CM 

 

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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DTC C1145, C1155, C1165, C1175 [DSC/RSC] 

DTC C1145, C1155, C1165, C1175 [DSC/RSC] DETECTION CONDITION AND POSSIBLE CAUSE 

more.  



Stop the vehicle and verify the 
DTCs.  



Are DTCs output again?  

REMOVAL/INSTALLATION .)

No

DTC troubleshooting completed.

DTC C1145

RF ABS wheel-speed sensor (open circuit) system

DTC C1155

LF ABS wheel-speed sensor (open circuit) system

DTC C1165

RR ABS wheel-speed sensor (open circuit) system

DTC C1175

LR ABS wheel-speed sensor (open circuit) system

DETECTION 

CONDITION 



Open circuit has been detected in the ABS wheel-speed sensor or the ABS wheel-
speed sensor wiring harness on any of the four vehicle wheels.  

POSSIBLE CAUSE 



Open circuit in the wiring harness between the following DSC/RSC HU/CM 
terminal and the ABS wheel-speed sensor terminal: 



DSC/RSC HU/CM terminal AE-RF ABS wheel-speed sensor terminal A  



DSC/RSC HU/CM terminal AB-RF ABS wheel-speed sensor terminal B  



DSC/RSC HU/CM terminal AG-LF ABS wheel-speed sensor terminal A  



DSC/RSC HU/CM terminal AD-LF ABS wheel-speed sensor terminal B  



DSC/RSC HU/CM terminal G-RR ABS wheel-speed sensor terminal A  



DSC/RSC HU/CM terminal J-RR ABS wheel-speed sensor terminal B  



DSC/RSC HU/CM terminal F-LR ABS wheel-speed sensor terminal A  



DSC/RSC HU/CM terminal I-LR ABS wheel-speed sensor terminal B  



ABS wheel-speed sensor malfunction  



Poor connection at connectors (female terminal)  

 

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 22 

© 2005 Mitchell Repair Information Company, LLC. 

 

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 23 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC C1145, C1155, C1165, C1175 [DSC/RSC] DIAGNOSTIC PROCEDURE 

STEP

INSPECTION

ACTION

1

INSPECT PID TO VERIFY THAT WHEEL 
SPEED-SIGNALS ARE TRANSMITTED 
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 



Drive the vehicle.  



Verify that the wheel speed-signals are 
transmitted from each ABS wheel-speed 
sensor.  



Are the wheel-speed signals transmitted?  

Yes Go to Step 4.

No

Go to the next step.

2

INSPECT FOR OPEN CIRCUIT IN WIRING 
HARNESS BETWEEN DSC/RSC HU/CM 
AND ABS WHEEL-SPEED SENSOR  



Turn the ignition switch off.  



Disconnect the DSC/RSC HU/CM 
connector and ABS wheel-speed sensor.  



Inspect for continuity in the wiring harness 
between the following ABS wheel-speed 
sensor connectors on the vehicle wiring 
harness-side and DSC/RSC HU/CM 
connectors. 



RF ABS wheel-speed sensor: AE-A  



RF ABS wheel-speed sensor: AB-B  



LF ABS wheel-speed sensor: AG-A  



LF ABS wheel-speed sensor: AD-B  



RR ABS wheel-speed sensor: G-A  

Yes Go to the next step.

No

Repair or replace the wiring harness, then 

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

Page 24 

© 2005 Mitchell Repair Information Company, LLC.