Hydraulic Flow
Distribution of Hydraulic Pressure
As the engine turns, the ATF pump starts to operate. Automatic transmission fluid (ATF) is drawn through the ATF strainer (filter) and discharged into the hydraulic circuit. Then, ATF flowing from the ATF pump becomes line pressure that is regulated by the regulator valve. Torque converter pressure from the regulator valve enters the torque converter through the lock-up shift valve, and it is discharged from the torque converter. The torque converter check valve prevents torque converter pressure from rising.
The PCM controls the shift solenoid valves ON and OFF. The shift valve intercepts line pressure from the ATF pump via the manual valve when the shift solenoid valve is OFF. When the shift solenoid valve is turned ON, line pressure changes to shift solenoid valve pressure at the shift solenoid valve, then the solenoid valve pressure flows to the shift valve. Applying shift solenoid pressure to the shift valves moves the position of the shift valve, and switches the port of the hydraulic circuit. The PCM also controls A/T clutch pressure control solenoid valves A, B, and C. The A/T clutch pressure control solenoid valves regulate hydraulic pressure, and apply the pressure to the clutches for engaging smoothly. The clutches are received optimum clutch pressure which is regulated by the A/T clutch pressure control solenoid valves for comfortable driving and shifting under all conditions.
Hydraulic pressure at the port is as follows:

PORT No. | DESCRIPTION OF PRESSURE | PORT No. | DESCRIPTION OF PRESSURE
--- | --- | --- | ---
1 | LINE | SB | SHIFT SOLENOID VALVE B
3 | LINE | SC | SHIFT SOLENOID VALVE C
3' | LINE | SD | SHIFT SOLENOID VALVE D
4 | LINE | SE | SHIFT SOLENOID VALVE E
4' | LINE | 10 | 1ST CLUTCH
4'' | LINE | 20 | 2ND CLUTCH
7 | LINE | 30 | 3RD CLUTCH
1A | LINE or A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A | 40 | 4TH CLUTCH
1B | LINE | 50 | 5TH CLUTCH
3A | LINE | 55 | A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A
3B | LINE | 55' | A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A
3C | LINE | 56 | A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE B
5A | LINE | 57 | A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C
5B | LINE | 90 | TORQUE CONVERTER
5C | LINE | 91 | TORQUE CONVERTER
5D | LINE | 92 | TORQUE CONVERTER
5E | LINE or A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE B | 93 | ATF COOLER
5F | LINE or A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A or B | 94 | TORQUE CONVERTER
5G | A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE B | 95 | LUBRICATION
5H | A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C | 96 | TORQUE CONVERTER
5J | A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C | 97 | TORQUE CONVERTER
5K | A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C | 99 | SUCTION
5L | A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C | X | DRAIN
5N | A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE C | HX | HIGH POSITION DRAIN
SA | SHIFT SOLENOID VALVE A | AX | AIR DRAIN