•  Timing and pressure control is performed for the 2-4 brake band engagement and release, 3-4 clutch, and coasting clutch pressures by the switching of hydraulic paths of the 1-2, 2-3, and 3-4 shift valves according to the routing of separate solenoid patterns for each of the following shifts: 1→2, 2→3, 3→O/D, O/D→3, O/D→2, 3→2, 3→1, and 2→1.

•  Shift solenoid on/off timing control is inhibited if the shift solenoid A, B or C have a malfunction.