Some 2007-2013 Mazda CX-9 (4WD) vehicles may experience front tire spin and/or 4WD/DSC light flashing with no DTCs stored, when driving uphill or taking off from a stop under hard acceleration.
NOTE: Do not turn on the engine during the procedure to avoid accidents/injuries.
The procedure requires three people.
1. Verify the customer concern.
a. With one person in the vehicle, raise and support the vehicle so that all four wheels are off the ground.
b. Turn the ignition switch to the ON position (engine off).
c. Apply the parking brake to prevent the rear wheels from rotating.
d. Shift the selector lever to the drive (D) position.
e. Depress the accelerator pedal fully to engage the electronic control coupling.
f. While depressing and holding the accelerator pedal, have two people try rotating both front wheels by hand in the same direction.
g. If both front wheels can be rotated, confirm rear propeller shaft operation. If the rear propeller shaft does not rotate, go to Step 2. If the shaft does rotate, diagnose further and repair as necessary.
2. Replace the transfer unit. Refer to workshop manual section 03-16. The new transfer unit is available as P/N AW21-27-500K-9U.