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.