Mazda CX-9 Grand Touring. Manual - part 540

 

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Mazda CX-9 Grand Touring. Manual - part 540

 

 

DTC B2936 [POWER LIFTGATE (PLG) SYSTEM] 

DTC B2936 - DETECTION CONDITION POSSIBLE CAUSE CHART 

2

INSPECT WIRING HARNESS BETWEEN 
PLG CONTROL MODULE AND 
LIFTGATE LOCK ACTUATOR
  

Disconnect the PLG control module 
connector.  

Disconnect the liftgate latch switch 
connector.  

Inspect the wiring harness between PLG 
control module terminals 1A and 1B, and 
liftgate lock actuator terminals A and B 
for an open circuit.  

Is the wiring harness normal?  

Yes Go to the next step.

No

Repair or replace the wiring harness. 

Go to Step 5.

3

INSPECT LIFTGATE LATCH SWITCH  

Inspect the liftgate latch switch. 

(See LIFTGATE LATCH AND 
LOCK ACTUATOR INSPECTION
 .) 

Is the liftgate latch switch 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.

4

INSPECT WIRING HARNESS BETWEEN 
PLG CONTROL MODULE AND 
LIFTGATE LATCH SWITCH
  

Inspect the wiring harness between PLG 
control module terminal 3F and liftgate 
latch switch 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.

5

VERIFY CORRECTION COMPLETED  

Reconnect the disconnected connector.  

Clear the DTC.  

Operate the PLG system. (Close 
operation)  

Is DTC B2821 stored?  

Yes

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

No

DTC troubleshooting completed.

DTC B2936

PLG motor circuit malfunction

DETECTION 

CONDITION 

The current flowing to the PLG motor is significantly low (1 A or less) and the output 
signal of rotation sensor A continues to not change while the PLG is operating.

 

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 36 

© 2005 Mitchell Repair Information Company, LLC. 

POSSIBLE CAUSE 

Open circuit in wiring harness between PLG control module terminal 1E and PLG 
motor terminal A (PLG drive unit)  

Open circuit in wiring harness between PLG control module terminal 1F and PLG 
motor terminal B (PLG drive unit)  

PLG drive unit (clutch) malfunction  

PLG motor 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 37 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC B2936 - DIAGNOSTIC PROCEDURE 

DTC B2937 [POWER LIFTGATE (PLG) SYSTEM] 

DTC B2937 - DETECTION CONDITION POSSIBLE CAUSE CHART 

STEP

INSPECTION

ACTION

1

INSPECT WIRING HARNESS 
BETWEEN PLG CONTROL MODULE 
AND PLG DRIVE UNIT
  

Disconnect the PLG control module 
connector.  

Disconnect the PLG drive unit 
connector.  

Inspect PLG control module 
terminals 1E and 1F, and PLG drive 
unit terminals A and B for an open 
circuit.  

Is the wiring harness normal?  

Yes

Replace the PLG drive unit. 
(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 B2936 stored?  

Yes

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

No

DTC troubleshooting completed.

DTC B2937

PLG motor circuit malfunction

DETECTION 

CONDITION 

PLG motor current is excessively low. (less than 1A)

POSSIBLE CAUSE 

Open circuit in wiring harness between PLG control module terminal 1E and 
PLG motor terminal A (PLG drive unit)  

Open circuit in wiring harness between PLG control module terminal 1F and 
PLG motor terminal B (PLG drive unit)  

PLG motor 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 38 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC B2937 - DIAGNOSTIC PROCEDURE 

STEP

INSPECTION

ACTION

INSPECT WIRING HARNESS 
BETWEEN PLG CONTROL MODULE 
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 39 

© 2005 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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