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 the lock-up control valve, and it is discharged from the torque converter. The torque converter check valve prevents torque converter pressure from rising.
The PCM controls shift solenoid valves A, B, C, and D ON and OFF, and the shift solenoid valves control shift solenoid pressure to the shift valves. Applying shift solenoid pressure to the shift valves moves the position of the shift valve, and switches the port of hydraulic pressure. The PCM also controls A/T clutch pressure control solenoid valves A, B, and C. The A/T clutch pressure control solenoid valves regulate A/T clutch pressure control solenoid valve pressure and apply A/T clutch pressure control solenoid valve pressure to CPC valves A, B, and C.
When shifting between gears, the clutch is engaged by pressure from the CPC pressure mode. The PCM controls one of the shift solenoid valves to move the position of the shift valve. This movement switches the port of CPC pressure and line pressure. Line pressure is then applied to the clutch, and CPC pressure is released. Engaging the clutch with line pressure mode happens when shifting is completed.
Hydraulic pressure at the ports:
| Port No. | Hydraulic Pressure | Port No. | Hydraulic Pressure | Port No. | Hydraulic Pressure |
|---|---|---|---|---|---|
| 1 | Line | 5G | CPC C | 51 | 5th clutch |
| 2 | Line | 5H | CPC B or Line | 56 | A/T clutch pressure control solenoid valve A |
| 3 | Line | 5J | CPC B or Line | 57 | A/T clutch pressure control solenoid valve B |
| 3' | Line | 5K | CPC A or Line | 5R | A/T clutch pressure control solenoid valve B |
| 3" | Reverse CPC or Line | 5L | CPC A or Line | 58 | A/T clutch pressure control solenoid valve C |
| 3A | Line | 5M | Line | 90 | Torque converter |
| 3B | Reverse CPC | 5N | CPC C | 90' | Torque converter |
| 4 | Line | 6 | Modulator | 91 | Torque converter |
| 4' | Line | SA | Shift solenoid valve A | 91' | Torque converter |
| 4" | Line | SB | Shift solenoid valve B | 92 | Torque converter |
| 4A | CPC A | SC | Shift solenoid valve C | 93 | ATF cooler |
| 4B | CPC B | SC | Shift solenoid valve C | 94 | Torque converter |
| 4C | CPC C | SD | Shift solenoid valve D | 95 | Lubrication |
| 5A | CPC A | 10 | 1st clutch | 95' | Lubrication |
| 5B | CPC A or Line | 15 | 1st-hold clutch | 96 | Torque converter |
| 5C | CPC B or Line | 20 | 2nd clutch | 99 | Suction |
| 5D | CPC B | 30 | 3rd clutch | X | Drain |
| 5E | CPC C | 40 | 4th clutch | HX | High position drain |
| 5F | CPC C | 50 | 5th clutch | AX | Air drain |