Gears are changed by solenoid valves A and B which are controlled by the AT controller, and the manual valve which is operated by the select lever.

When the select lever is in the "P", "N" or "R" position, gear change is operated mechanically by the manual valve and line pressure.

In the other positions, shifting up and down to 1st, 2nd, 3rd, and 4th gears is controlled by shift solenoid valves A and B.

Important: If the AT fluid temperature is less than 20°C (68°F), shifting-up to 4th gear is not possible. This, however, is not a problem.

Refer to the sections above for the powerflow mechanism and the oil pressure circuit for each gear position.

(1)	Input
(2)	Output
(3)	Shift solenoid A
(4)	Shift solenoid B
(5)	Line pressure solenoid
(6)	Transmission control module
(7)	Shift switch signal
(8)	Over drive switch signal
(9)	Throttle signal
(10)	Park/Neutral Position (PNP) Switch
(11)	Vehicle speed signal

Lock-Up Control

When conditions are met when driving at higher than a certain speed in 3rd (overdrive OFF) or 4th (overdrive ON) gears, the AT controller outputs a signal to the lock-up solenoid and locks up the lock-up control is operated by the lock-up solenoid and the lock-up control valve.

Lock-Up Control Execution Conditions

•	The shift position must be 3rd or 4th gear.

•	The throttle opening angle and vehicle speed must be within the lock-up control range.

•	The AT fluid temperature must be within control execution range. (20°C or more)

•	The shift switch is in the "D" position.

Conditions When Lock-Up Control Is Not Executed

The execution conditions are not met.