Mazda CX-9 Grand Touring. Manual - part 535

DIAGNOSTIC PROCEDURE 

DTC B266B - DIAGNOSTIC PROCEDURE 

STEP

INSPECTION

ACTION

INSPECT WIRING HARNESS BETWEEN 
PLG CONTROL UNIT AND PLG DRIVE 
UNIT  

Replace the PLG drive unit. 

 

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 16 

© 2005 Mitchell Repair Information Company, LLC. 

DTC B266C [POWER LIFTGATE (PLG) SYSTEM] 

DTC B266C - DETECTION CONDITION POSSIBLE CAUSE CHART 

1



Disconnect the PLG control module 
connector.  



Disconnect the PLG drive unit connector. 



Inspect the wiring harness between PLG 
control module terminal 2J and PLG drive 
unit terminal F for an open circuit/short 
circuit to power supply system/short 
circuit to ground system.  



Is the wiring harness normal?  

Yes

(See POWER LIFTGATE (PLG) DRIVE 
UNIT REMOVAL/INSTALLATION .) 
Go to the next step.

No

Repair or replace the wiring harness. 

Go to the next step.

2

VERIFY CORRECTION COMPLETED  



Reconnect the disconnected connector.  



Clear the DTC.  



Operate the PLG system.  



Is DTC B266B stored?  

Yes

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

No

DTC troubleshooting completed.

DTC B266C

Rotation sensor B circuit malfunction

DETECTION 

CONDITION 

Rotation sensor B signal does not change

POSSIBLE 

CAUSE 



Open circuit in wiring harness between PLG control module terminal 2L and PLG 
drive unit terminal J Short to power supply in wiring harness between PLG control 
module terminal 2L and PLG drive unit terminal J  



Short to GND in wiring harness between PLG control module terminal 2L and PLG 
drive unit terminal J  



Rotation sensor 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 17 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC B266C - DIAGNOSTIC PROCEDURE 

STEP

INSPECTION

ACTION

INSPECT WIRING HARNESS BETWEEN 
PLG CONTROL UNIT AND PLG DRIVE 
UNIT  

Replace the PLG drive unit. 

 

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 18 

© 2005 Mitchell Repair Information Company, LLC. 

DTC B266E [POWER LIFTGATE (PLG) SYSTEM] 

DTC B266E - DETECTION CONDITION POSSIBLE CAUSE CHART 

1



Disconnect the PLG control module 
connector.  



Disconnect the PLG drive unit connector.  



Inspect the wiring harness between PLG 
control module terminal 2L and PLG drive 
unit terminal J for an open circuit/short 
circuit to the power supply system/short 
circuit to the ground system.  



Is the wiring harness normal?  

Yes

(See POWER LIFTGATE (PLG) 
DRIVE UNIT 
REMOVAL/INSTALLATION .) 
Go to the next step.

No

Repair or replace the wiring harness. 

Go to the next step.

2

VERIFY CORRECTION COMPLETED  



Reconnect the disconnected connector.  



Clear the DTC.  



Operate the PLG system.  



Is DTC B266C stored?  

Yes

Replace the PLG control module. 
(See POWER LIFTGATE (PLG) 
DRIVE UNIT 
REMOVAL/INSTALLATION .)

No

DTC troubleshooting completed.

DTC B266E

Rotation sensor malfunction

DETECTION 

CONDITION 

The PLG operation direction (open/close) and the PLG motor rotation direction from 
the rotation sensor do not correspond.

POSSIBLE CAUSE 



PLG arm malfunction  



PLG slider malfunction  



Torque cable malfunction  



Reverse connection of the PLG motor  



PLG drive unit (rotation sensor) 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 19 

© 2005 Mitchell Repair Information Company, LLC.