1st Speed

1st Speed

The flow of fluid through the torque converter circuit is the same as in N position. Line pressure (1) becomes line pressure (4) and then 1st clutch pressure (10). The 1st clutch pressure is applied to the 1st clutch and 1st accumulator; consequently, the vehicle will move as engine power is transmitted.

Line pressure (1) becomes modulator pressure (6) by the modulator valve and travels to 1 – 2 and 3 – 4 shift valves.

The 1 – 2 shift valve is moved to the right side because shift control solenoid valve A is turned off and shift control solenoid B is turned on by the transmission control module. This valve stops 2nd clutch pressure and power is not transmitted to the 2nd clutch.

Line pressure (4) also flows to the servo valve and line pressure (1) also flows to throttle valve B.

Key to hydraulic flow diagram