Mazda CX-9 Grand Touring. Manual - part 586

ACTIVE COMMAND MODES TABLE 

ACTIVE COMMAND MODES CHART 

MALFUNCTIONING WHEEL UNIT IDENTIFICATION 

IC_DTC_CNT 
(Number of continuous 
DTCs)

-

Indicates number of DTC

Perform the DTC 
inspection.

ID_LAST

(1)

 

(Last received tire 
transmitter ID code 
value)

-

Indicates the last ID that is 
transmitted from the wheel unit.



Replace the wheel 
unit.  



Perform the 
configuration.  

ID_WU1

(1)

 

ID_WU2

(1)

 

ID_WU3

(1)

 

ID_WU4

(1)

 

(Registered wheel unit 
ID code)

-

Indicates the registered ID that is 
transmitted from the wheel unit.



Replace the wheel 
unit.  



Perform the wheel 
unit ID registration. 

WU1_P

(1)

 

WU2_P

(1)

 

WU3_P

(1)

 

WU4_P

(1)

 

(Tire pressure value)

Pa, psi

Indicates the tire pressure. (See 
SUSPENSION TECHNICAL 
DATA .)



Adjust tire pressure. 



Replace the wheel 
unit.  

WU1_T

(1)

 

WU2_T

(1)

 

WU3_T

(1)

 

WU4_T

(1)

 

(Internal tire air 
temperature value)

°C, °F

Indicates the internal tire air 
temperature.

Replace the wheel unit.

(1)

Data transmission from the wheel unit occurs when the vehicle speed is 25 km/h {15.5 mph} or 
more . Due to this, the current air pressure and temperature data can only be displayed after the 
vehicle is driven at 25 km/h {15.5 mph} or more . Also, the ID_LAST, and tire pressure and internal 
tire air temperature data are erased when the instrument cluster connector and the battery terminal are 
disconnected. If the instrument cluster is replaced or the battery terminals are disconnected, drive the 
vehicle at 25 km/h {15.5 mph} or more and display the tire pressure PID after the data transmission.

Command Name

Definition

Operation

Note

IDR_MODE

Wheel unit ID registration mode

OFF/ON

Ignition switch at ON

NOTE:



The tire pressure monitoring system (TPMS) does not identify the location 
of the malfunctioning wheel unit on the vehicle (RF, LF, LR, RR). The TPMS 

 

2008 Mazda CX-9 Grand Touring 

2008 SUSPENSION On-Board Diagnostic (Suspension) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:25:36 AM

Page 9 

© 2005 Mitchell Repair Information Company, LLC. 

1. Adjust the air pressure as follows: 



RF: 220 kPa {2.2 kgf/cm

2

 , 32 psi} 

 



LF: 240 kPa {2.4 kgf/cm

2

 , 35 psi} 

 



LR: 260 kPa {2.6 kgf/cm

2

 , 38 psi} 

 



RR: 280 kPa {2.8 kgf/cm

2

 , 40 psi} 

 

2. Turn the ignition switch off.  

3. Connect the M-MDS to the DLC-2.  

4. Turn the ignition switch to the ON position.  

5. Drive the vehicle at a speed of 25 km/h {15.5 mph} or more for 2 min or more  

6. Select the following PIDs using the M-MDS, and monitor them. 



WU1_P  



WU2_P  



WU3_P  



WU4_P  

7. Determine which wheel unit identification code matches which wheel and tire by comparing the PID 

monitor values with the air pressure values set in Step 1.  

8. Select the ID_LAST PID using the M-MDS, and take a note of four displayed identification codes.  

9. Inspect the DTCs using the M-MDS. 

Fig. 8: Wheel Unit Identification Code Chart 
Courtesy of MAZDA MOTORS CORP. 

DTC B2143 

identifies each wheel unit as No.1, No.2, No.3 and No.4. In order to identify 
the location of the wheel unit, perform the following procedure.  

 

2008 Mazda CX-9 Grand Touring 

2008 SUSPENSION On-Board Diagnostic (Suspension) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:25:36 AM

Page 10 

© 2005 Mitchell Repair Information Company, LLC. 

DTC B2143 DETECTION CONDITION AND POSSIBLE CAUSE

DIAGNOSTIC PROCEDURE 

DTC B2143 DIAGNOSTIC PROCEDURE 

DTC B2868, B2869, B2870, B2871 

DTC B2868, B2869, B2870, B2871 DETECTION CONDITION AND POSSIBLE CAUSE 

DTC B2143



ID registration failure  

DETECTION CONDITION 



Two or more codes are overlapping.  

POSSIBLE CAUSE 



ID registration procedure has not been performed properly.  

STEP

INSPECTION

ACTION

1

VERIFY THE PROGRAMMED ID  



Turn the ignition switch off.  



Connect the M-MDS to the DLC-2.  



Select the following PIDs using the 
M-MDS: 



ID_WU1  



ID_WU2  



ID_WU3  



ID_WU4  



Turn the ignition switch to the ON 
position.  



Is the same code in the output ID?  

Yes

Register the wheel unit ID, then go to the next 
step. (See WHEEL UNIT ID 
REGISTRATION .)

No

Go to the next step.

2

VERIFY TROUBLESHOOTING 
COMPLETED  



Clear the DTC from the memory. 
(See TIRE PRESSURE 
MONITORING SYSTEM 
(TPMS) ONBOARD DIAGNOSIS.) 



Drive the vehicle at a speed of 25 
km/h {15.5 mph} or more for 10 
min or more.  



Is the same DTC present?  

Yes



Repeat the inspection from Step 1.  

 
If the malfunction recurs, replace the instrument 
cluster and/or wheel unit. 
(See INSTRUMENT CLUSTER 
REMOVAL/INSTALLATION .) 
(See WHEEL UNIT 
REMOVAL/INSTALLATION .)

No

Go to the next step.

3

VERIFY AFTER REPAIR 
PROCEDURE  



Are there any other DTCs present?  

Yes

Go to the applicable DTC inspection. (See TIRE 
PRESSURE MONITORING SYSTEM 
(TPMS) ON-BOARD DIAGNOSIS.)

No

DTC troubleshooting completed.

DTC B2868

Wheel unit No.1 (internal malfunction)

 

2008 Mazda CX-9 Grand Touring 

2008 SUSPENSION On-Board Diagnostic (Suspension) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:25:36 AM

Page 11 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC B2868, B2869, B2870, B2871 DIAGNOSTIC PROCEDURE 

DTC U0127 

DTC U0127 DETECTION CONDITION AND POSSIBLE CAUSE 

DTC B2869

Wheel unit No.2 (internal malfunction)

DTC B2870

Wheel unit No.3 (internal malfunction)

DTC B2871

Wheel unit No.4 (internal malfunction)

DETECTION CONDITION 



The instrument cluster receives error signals from the wheel unit.  

POSSIBLE CAUSE 



Internal malfunction of wheel unit  

STEP

INSPECTION

ACTION

1

IDENTIFY MALFUNCTIONING WHEEL 
UNIT  



(See MALFUNCTIONING WHEEL 
UNIT IDENTIFICATION.)  



Identify the malfunctioning wheel unit.  



Replace and register the wheel unit. (See 
WHEEL UNIT ID 
REGISTRATION .)  



Go to the next step.  

2

VERIFY TROUBLESHOOTING 
COMPLETED  



Clear the DTC from the memory. (See 
TIRE PRESSURE MONITORING 
SYSTEM (TPMS) ONBOARD 
DIAGNOSIS.)  



Drive the vehicle at a speed of 25 km/h 
{15.5 mph} or more for 10 min or 
more.  



Is the same DTC present?  

Yes Go to Step 1.

No

Go to the next step.

3

VERIFY AFTER REPAIR PROCEDURE 



Are there any other DTCs present?  

Yes

Go to the applicable DTC inspection. (See 
TIRE PRESSURE MONITORING 
SYSTEM (TPMS) ON-BOARD 
DIAGNOSIS.)

No

DTC troubleshooting completed.

DTC U0127



Communication failure between instrument cluster and keyless 
receiver  

DETECTION 

CONDITION 



The instrument cluster cannot receive signal from the keyless CM or 
keyless receiver.  

With advanced keyless system 



Open or short circuit in the wiring harness between the keyless CM 

 

2008 Mazda CX-9 Grand Touring 

2008 SUSPENSION On-Board Diagnostic (Suspension) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:25:36 AM

Page 12 

© 2005 Mitchell Repair Information Company, LLC.