Mazda CX-9 Grand Touring 2009 Manual page 2161

2008 BODY & ACCESSORIES On-Board Diagnostic (Power Liftgate (PLG) System) - Mazda CX-9
Disconnect the PLG control module
connector.
Disconnect the PLG drive unit
connector.
1
Inspect the wiring harness between
PLG control module terminals 1E and
1F, and PLG drive unit terminals A and
B for an open circuit.
Is the wiring harness normal?
VERIFY CORRECTION COMPLETED
Reconnect the disconnected connector.
2
Clear the DTC.
Operate the PLG system.
Is DTC B2937 stored?
DTC B2939 [POWER LIFTGATE (PLG) SYSTEM]
DTC B2939 - DETECTION CONDITION POSSIBLE CAUSE CHART
DTC B2939 Clutch circuit malfunction
DETECTION The current flowing to the PLG motor is normal (1 A or more), however, the output
CONDITION signal of rotation sensor A continues to not change while the PLG is operating.
POSSIBLE CAUSE
2008 Mazda CX-9 Grand Touring
Yes
No
Yes
No
Open circuit in wiring harness between PLG control module terminal 21 and PLG
drive unit terminal M
Open circuit in wiring harness between PLG control module terminal 2G and PLG
drive unit terminal N
Clutch malfunction
PLG control module malfunction
(See POWER LIFTGATE (PLG) DRIVE
UNIT REMOVAL/INSTALLATION .)
Go to the next step.
Repair or replace the wiring harness.
Go to the next step.
Replace the PLG control module.
(See POWER LIFTGATE (PLG)
CONTROL MODULE
REMOVAL/INSTALLATION .)
DTC troubleshooting completed.