Mazda CX-9 Grand Touring. Manual - part 539

DIAGNOSTIC PROCEDURE 

DTC B2701 - DIAGNOSTIC PROCEDURE 

CONDITION 

POSSIBLE CAUSE 



Short to GND in wiring harness between PLG control module terminal 3B and 
PLG touch sensor (LH) terminal B  



PLG touch sensor (LH) malfunction  



Obstructions in the detection part  



PLG control module malfunction  

STEP

INSPECTION

ACTION

1

INSPECT PLG TOUCH SENSOR (LH)  



Inspect the PLG touch sensor (LH). 

(See POWER LIFTGATE (PLG) 
TOUCH SENSOR INSPECTION .) 



Is the touch sensor normal?  

Yes Go to the next step.

No

Replace the PLG touch sensor (LH). 

(See POWER LIFTGATE (PLG) TOUCH 

SENSOR REMOVAL/INSTALLATION .)

Go to Step 3.

2

INSPECT WIRING HARNESS BETWEEN 
PLG CONTROL MODULE AND PLG 
TOUCH SENSOR (LH)  



Inspect the wiring harness between PLG 
control module terminal 3B and PLG 
touch sensor (LH) terminal B for a short 
circuit to ground system.  

Yes Go to the next step.

No

Repair or replace the wiring harness. 

Go to the next step.

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES On-Board Diagnostic (Power Liftgate (PLG) System) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:46:08 AM

Page 32 

© 2005 Mitchell Repair Information Company, LLC. 

DTC B2702 [POWER LIFTGATE (PLG) SYSTEM] 

DTC B2702 - DETECTION CONDITION POSSIBLE CAUSE CHART 

DIAGNOSTIC PROCEDURE 

DTC B2702 - DIAGNOSTIC PROCEDURE 



Is the wiring harness normal?  

3

VERIFY CORRECTION COMPLETED  



Reconnect the disconnected connector.  



Clear the DTC.  



Is DTC B2701 stored after 5 min or 
more have elapsed?  

Yes

Replace the PLG control module. 
(See POWER LIFTGATE (PLG) 
CONTROL MODULE 
REMOVAL/INSTALLATION .)

No

DTC troubleshooting completed.

DTC B2702

PLG touch sensor (RH) circuit malfunction

DETECTION 

CONDITION 

A short circuit to ground in the PLG touch sensor (RH) continues for 5 min or more.

POSSIBLE CAUSE 



Short to GND in wiring harness between PLG control module terminal 3A and 
PLG touch sensor (RH) terminal B  



PLG touch sensor (RH) malfunction  



Obstructions in the detection part  



PLG control module malfunction  

STEP

INSPECTION

ACTION

INSPECT PLG TOUCH SENSOR (RH)  

Yes Go to the next step.

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES On-Board Diagnostic (Power Liftgate (PLG) System) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:46:08 AM

Page 33 

© 2005 Mitchell Repair Information Company, LLC. 

DTC B2821 [POWER LIFTGATE (PLG) SYSTEM] 

DTC B2821 - DETECTION CONDITION POSSIBLE CAUSE CHART 

1



Inspect the PLG touch sensor (RH). 

(See POWER LIFTGATE (PLG) 
TOUCH SENSOR INSPECTION .) 



Is touch sensor normal?  

No

Replace the PLG touch sensor (RH). 

(See POWER LIFTGATE (PLG) TOUCH 

SENSOR REMOVAL/INSTALLATION .)

Go to Step 3.

2

INSPECT WIRING HARNESS BETWEEN 
PLG COTROL MODULE AND PLG 
TOUCH SENSOR (RH)  



Inspect the wiring harness between PLG 
control module terminal 3A and PLG 
touch sensor (RH) terminal B for a short 
circuit to ground system.  



Is the wiring harness normal?  

Yes Go to the next step.

No

Repair or replace the wiring harness. 

Go to the next step.

3

VERIFY CORRECTION COMPLETED  



Reconnect the disconnected connector.  



Clear the DTC.  



Is DTC B2702 stored after 5 min or 
more have elapsed?  

Yes

Replace the PLG control module. 
(See POWER LIFTGATE (PLG) 
CONTROL MODULE 
REMOVAL/INSTALLATION .)

No

DTC troubleshooting completed.

DTC B2821

Closure motor circuit malfunction

DETECTION 

CONDITION 

Liftgate latch switch signal does not change (ON) when closure motor is operating

POSSIBLE CAUSE 



Open circuit in wiring harness between PLG control module terminal 1A and 
closure motor terminal A (liftgate latch and lock actuator)  



Open circuit in wiring harness between PLG control module terminal 1B and 
closure motor terminal B (liftgate latch and lock actuator)  



A short circuit to ground in the wiring harness between the liftgate latch switch 
and PLG control module  



Closure motor malfunction  



Liftgate latch switch malfunction  



PLG control module malfunction  

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES On-Board Diagnostic (Power Liftgate (PLG) System) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:46:08 AM

Page 34 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC B2821 - DIAGNOSTIC PROCEDURE 

STEP

INSPECTION

ACTION

1

INSPECT LIFTGATE LOCK ACTUATOR
 



Inspect the liftgate lock actuator. 

(See LIFTGATE LATCH AND 
LOCK ACTUATOR INSPECTION .) 



Is the liftgate lock actuator normal?  

Yes Go to the next step.

No

Replace the liftgate latch and lock actuator.

(See LIFTGATE LATCH AND LOCK 

ACTUATOR 

REMOVAL/INSTALLATION .) 

Go to Step 5.

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES On-Board Diagnostic (Power Liftgate (PLG) System) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:46:08 AM

Page 35 

© 2005 Mitchell Repair Information Company, LLC.