Reverse Inhibitor Control
When R is selected while the vehicle is moving forward at speeds over 6 mph (10 km/h), the PCM commands shift solenoid valve D to remain OFF so that shift solenoid valve D pressure (SD) is not applied to the reverse control valve Line pressure (3) stops at the reverse control valve, and is not applied to the servo valve No power is transmitted to the reverse direction
NOTE:
When used, "left" or "right" indicates direction on the hydraulic circuit