Mazda CX-9 Grand Touring. Manual - part 118

ACTIVE COMMAND MODES TABLE 

ACTIVE COMMAND MODES CHART 

DTC B1317, B1318 [DSC/RSC] 

DTC B1317, B1318 [DSC/RSC] DETECTION CONDITION AND POSSIBLE CAUSE 

Command name

Output part

Operation

Operating condition

PMP_MOTOR

Pump motor

Off/On

Ignition switch at ON

PWR_RLY

Valve relay

SSR_INTL

DSC/RSC sensor initialization

V_LF_INL

LF inlet solenoid valve

V_LF_OTL

LF outlet solenoid valve

V_LR_INL

LR inlet solenoid valve

V_LR_OTL

LR outlet solenoid valve

V_RF_INL

RF inlet solenoid valve

V_RF_OTL

RF outlet solenoid valve

V_RR_INL

RR inlet solenoid valve

V_RR_OTL

RR outlet solenoid valve

V_STB_L

LH stability control solenoid valve

V_STB_R

RH stability control solenoid valve

V_TRC_L

LH traction control solenoid valve

V_TRC_R

RH traction control solenoid valve

NOTE:



DTC B1317 is output when the battery voltage is 16 V or more. If DTC 
B1317 is output, inspect the battery and charging system for a malfunction 
before performing the malfunction diagnosis.  

DTC B1317, B1318 Power supply system

DETECTION 

CONDITION 



B1317 



DSC/RSC HU/CM terminal X voltage of 16 V or more continues for 3 s 
while driving at a vehicle speed of 8 km/h or more.  



DSC/CM terminal X voltage of 18.5 V or more continues for 15 ms while 
driving at a vehicle speed of 8 km/h or more.  



B1318 



DSC/RSC HU/CM terminal X voltage of 10 V or less continues for 3 s 
while driving at a vehicle speed of 8 km/h or more.  

POSSIBLE CAUSE 



SAS 7.5A fuse malfunction  



Open circuit or short to ground in the wiring harness between the DSC/RSC 
HU/CM terminal X and the battery  



Open circuit or faulty ground in the wiring harness between the DSC/RSC 
HU/CM terminal A and the body ground  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 9:50:12 AM

Page 13 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC B1317, B1318 DIAGNOSTIC PROCEDURE 



Battery deterioration  



Generator malfunction  



Poor connection at connectors (female terminal)  

STEP

INSPECTION

ACTION

1

INSPECT DSC/RSC HU/CM 
POWER SUPPLY FOR OPEN 
CIRCUIT  



Start the engine.  



Measure the voltage between 

Yes Go to the next step.

No

Repair or replace the wiring harness for open circuit 

between the DSC/RSC HU/CM and ground, then go 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 9:50:12 AM

Page 14 

© 2005 Mitchell Repair Information Company, LLC. 

DTC B1342, C1730 [DSC/RSC] 

DTC B1342, C1730 [DSC/RSC] DETECTION CONDITION AND POSSIBLE CAUSE 

DSC/RSC HU/CM terminal X 
and ground.  



Is the voltage approx. 10 V?  

to Step 3.

2

INSPECT DSC/RSC HU/CM 
GROUND FOR POOR GROUND 
OR OPEN CIRCUIT  



Turn the ignition switch off.  



Measure the resistance between 
ground and DSC/RSC HU/CM 
terminal A.  



Is the resistance within 0-1 
ohm ?  

Yes Go to the next step.

No

If there is no continuity: 



Repair or replace the wiring harness for open 

circuit between the DSC/RSC HU/CM and 

ground, then go to the next step.  

 

If the resistance is not within 0-1 ohm : 



Repair or replace the wiring harness for poor 

ground, then go to the next step.  

3

VERIFY TROUBLESHOOTING 
COMPLETED  



Make sure to reconnect all 
disconnected connectors.  



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.

4

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.

NOTE:



Perform the inspection of DTCs other than B1342 and C1730 first when 
verifying DTCs.  

DTC B1342, C1730

DSC/RSC HU/CM system

DETECTION 

CONDITION 



B1342 



DSC/RSC HU/CM on-board diagnostic function detects control 
module malfunction.  



C1730 



Sensor supply voltage is out of range.  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 9:50:12 AM

Page 15 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC B1342, C1730 [DSC/RSC] DIAGNOSTIC PROCEDURE 

DTC B211B, C1279, C1280, C1281, C1282, C1516, C1517, C2769, C2770 
[DSC/RSC] 

DTC B211B, C1279, C1280, C1281, C1282, C1516, C1517, C2769, C2770 [DSC/RSC] DETECTION 
CONDITION AND POSSIBLE CAUSE 

POSSIBLE CAUSE 



DSC/RSC HU/CM internal malfunction  

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 B1342 
and C1730 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 
more.  



Stop the vehicle and verify the 
DTCs.  



Are DTCs output again?  

Yes

If DTC B1342 or C1730 is output again, replace the 
DSC/RSC HU/CM. 
(See DSC/RSC HU/CM 
REMOVAL/INSTALLATION .)

No

DTC troubleshooting completed.

DTC B211B, C1279, C1280, C1281, 

C1282, C1516, C1517, C2769, C2770

Combined sensor system



B211B 



Combined sensor internal malfunction.  



C1279 



There is an abnormality in the signal from the 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 9:50:12 AM

Page 16 

© 2005 Mitchell Repair Information Company, LLC.