Transaxle Will Not Shift
WARNING: This page is about a different car, the 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
When gear position is fixed in 4th gear due to the fail-safe operation, fault is in the transaxle. Go to LOW MAXIMUM SPEED & POOR ACCELERATION . Possible cause: clutch burned, line pressure low, incorrect throttle position signal, faulty VSS, faulty input/turbine speed sensor, faulty sensor ground, faulty shift solenoid "A", "B" or "C", faulty control valve body, 4th gear is fixed (operation in fail-safe function), short or open circuit in wiring, poor electrical connection, poor ground of shift solenoid electrical parts, output and input system faulting.