[D3] or [D4] Position
[D3] or [D4] Position
1. 1st Speed
The flow of fluid through the torque converter circuit is the same as in TN position.
The line pressure (1) becomes line pressure (4) and it becomes the 1St clutch pressure (10). The 1st clutch pressure is applied to the 1St clutch and 1St accumulator; consequently, the vehicle will move as the engine power is transmitted. The line pressure (1) becomes the 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 the shift control solenoid valve A is turned off and B is turned on by the TCM. 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.
NOTE:
- When used, "left" or "right" indicates direction on the flowchart.
- SOL - (A): Shift Control Solenoid Valve A
- SOL - (B): Shift Control Solenoid Valve B
- SOL - (C): Lock-up Control Solenoid Valve A
- SOL - (D): Lock-up Control Solenoid Valve B
2. 2nd Speed
The flow of fluid up the 1-2 shift valve is the same as in 1st speed. As the speed of the car reaches the prescribed value, the solenoid valve A is turned on by means of the TCM. As a result, the 1-2 shift valve is moved to the left and uncovers the port leading to the 2nd clutch; the 2nd clutch is engaged.
Fluid flows by way of:
- Line pressure (4) 1-2 Shift Valve 2-3 Shift Valve - 2nd Clutch Pressure (21) 2nd Clutch
The hydraulic pressure also flows to the 1St clutch. However, no power is transmitted because of the one-way clutch.
NOTE:
- When used, "left" or "right" indicates direction on the flowchart.
- SOL - (A): Shift Control Solenoid Valve A
- SOL - (B): Shift Control Solenoid Valve B
- SOL - (C): Lock-up Control Solenoid Valve A
- SOL - (D): Lock-up Control Solenoid Valve B
3. 3rd Speed
The flow of fluid up to the 1-2 and 2-3 shift valves is the same as in 2nd speed. As the speed of the car reaches the prescribed value, the shift control solenoid valve B is turned off (shift control solenoid valve A remains on). The 2-3 shift valve is then moved to the left, uncovering the oil port leading to the 3rd clutch. Since the 3-4 shift valve is moved to the right to cover the oil port to the 4th clutch, the 3rd clutch is turned on.
Fluid flows by way of:
- Line Pressure (4) 1-2 Shift Valve 2-3 Shift Valve - 3rd Clutch Pressure (31) - 3-4 Shift Valve (not controlled) - 3rd Clutch Pressure (30) - 3rd Clutch
The hydraulic pressure also flows to the 1St clutch. However, no power is transmitted because of the one-way clutch as in the 2nd speed.
NOTE:
- When used, "left" or "right" indicates direction on the flowchart.
- SOL - (A): Shift Control Solenoid Valve A
- SOL - (B): Shift Control Solenoid Valve B
- SOL - (C): Lock-up Control Solenoid Valve A
- SOL - (D): Lock-up Control Solenoid Valve B
[D4] Position
4. 4th Speed
The flow of fluid up to the 1-2, 2-3 and 3-4 shift valves is the same as in 3rd speed. As the speed of the car reaches the prescribed value, the shift control solenoid valve A is turned off (shift control solenoid valve B remains off). As this takes place, 3-4 shift valve is moved to the left and uncovers the oil port leading to the 4th clutch. Since the 1-2 and 2-3 shift valves are kept on the left side, the fluid flows through the 4th clutch; the power is transmitted through the 4th clutch.
Fluid flows by way of:
- Line Pressure (4) 1-2 Shift Valve 2-3 Shift Valve 3rd Clutch Pressure (31) 3-4 Shift Valve - 4th Clutch pressure (41) - Manual Valve - 4th Clutch Pressure (40) - 4th Clutch
The hydraulic pressure also flows to the 1St clutch. However, no power is transmitted because of the one-way clutch as in 2nd and 3rd speed.
NOTE:
- When used, "left" or "right" indicates direction on the flowchart.
- SOL - (A): Shift Control Solenoid Valve A
- SOL - (B): Shift Control Solenoid Valve B
- SOL - (C): Lock-up Control Solenoid Valve A
- SOL - (D): Lock-up Control Solenoid Valve B