Hydraulic Circuits

Hydraulic Circuits

Hydraulic Circuit Identification and Function





Hydraulic Circuit Identification Chart






















































Line Pressure Hydraulic Circuits

The PCM controls line pressure with the Line Pressure Control (LPC) solenoid. This affects shift feel and apply component operation.

When the engine is running, the pump supplies pressure to the pressure regulator valve, which is controlled by the LPC (Line Pressure Control) solenoid. The pressure regulator valve controls the line pressure.

The line pressure circuit supplies the manual valve. The manual valve directs the line pressure to either the REV/REV SUPPLY circuit when the manual lever is in the REVERSE position or the DRIVE 1 circuit when the manual lever is in the DRIVE or LOW position.





Lubrication Hydraulic Circuits

Lubrication for the transaxle is supplied by the transmission fluid cooler return tube. Transmission fluid is sent to the transmission fluid cooler from the Torque Converter Clutch (TCC) control valve.

LINE pressure supplied to the pressure regulator valve is sent to the TCC (Torque Converter Clutch) control valve as CONV FD pressure. During TCC (Torque Converter Clutch) release, the TCC (Torque Converter Clutch) control valve sends the transmission fluid to the torque converter to release the clutch. The transmission fluid returns to the TCC (Torque Converter Clutch) control valve from the torque converter and is directed to the transmission fluid cooler on the COOLER FEED circuit.





When the TCC (Torque Converter Clutch) clutch is applied the TCC (Torque Converter Clutch) solenoid applies pressure to the TCC (Torque Converter Clutch) control and regulator apply valves. The TCC (Torque Converter Clutch) control valve directs the CONV FD circuit to the COOLER FEED circuit.

For lubrication passage location and description, refer to Mechanical Components and Functions Mechanical Components and Functions.





Torque Converter Hydraulic Circuits

The PCM controls the TCC (Torque Converter Clutch) solenoid. The TCC (Torque Converter Clutch) solenoid applies hydraulic pressure to the TCC (Torque Converter Clutch) control and regulator apply valves through the TCC SOL SIG circuit. Regulated DRIVE 2 pressure from the multiplex shift valve is directed to the TCC (Torque Converter Clutch) control valve by the TCC (Torque Converter Clutch) regulator apply valve through the REG APPLY circuit. The TCC (Torque Converter Clutch) control valve directs pressure from the REG APPLY circuit to the TCC APPLY circuit to apply the clutch.

The transmission fluid returns to the TCC (Torque Converter Clutch) control valve through the TCC RELEASE hydraulic circuit. The TCC (Torque Converter Clutch) control valve opens the TCC RELEASE circuit to exhaust, so the TCC RELEASE circuit is not pressurized when the TCC (Torque Converter Clutch) is applied.





When the TCC (Torque Converter Clutch) is released, The TCC (Torque Converter Clutch) solenoid does not apply hydraulic pressure to the TCC (Torque Converter Clutch) control or regulator apply valves. The TCC (Torque Converter Clutch) control valve, in this position, directs hydraulic pressure from the CONV FD circuit to the torque converter through the TCC RELEASE hydraulic circuit and it returns to the TCC (Torque Converter Clutch) control valve through the TCC APPLY circuit.

For torque converter description and function, refer to Torque Converter Torque Converter.





Solenoid Hydraulic Circuits

LINE pressure from the pump is directed to the individual shift, TCC (Torque Converter Clutch) and LPC (Line Pressure Control) solenoids by the solenoid regulator valve on the SOL FEED circuit. The solenoids, controlled by the PCM, direct the fluid to the valves that they control.

The LPC (Line Pressure Control) solenoid sends varying pressure to the line pressure regulator valve to control line pressure.

In PARK position, Shift Solenoid D (SSD) directs pressure to the low/reverse/overdrive (4, 5, 6) regulator and boost valves through the SSD SIG hydraulic circuit. Shift Solenoid E (SSE) directs pressure to the multiplex shift valve to direct regulated pressure from the low/reverse/overdrive (4, 5, 6) regulator valve to the low/reverse clutch.





In REVERSE position, SSD (Shift Solenoid D) directs pressure to the low/reverse/overdrive (4, 5, 6) regulator and boost valves through the SSD SIG hydraulic circuit. SSE (Shift Solenoid E) directs pressure to the multiplex shift valve to direct regulated pressure from the low/reverse/overdrive (4, 5, 6) regulator valve to the low/reverse clutch. Shift Solenoid B (SSB) directs pressure to the direct (3, 5, R) regulator and boost valves through the SSB SIG hydraulic circuit to apply the direct (3, 5, R) clutch.





In NEUTRAL position, SSD (Shift Solenoid D) directs pressure to the low/reverse/overdrive (4, 5, 6) regulator and boost valves through the SSD SIG hydraulic circuit. SSE (Shift Solenoid E) directs pressure to the multiplex shift valve to direct regulated pressure from the low/reverse/overdrive (4, 5, 6) regulator valve to the low/reverse clutch.





In 1st gear, Shift Solenoid A (SSA) directs pressure to the forward (1, 2, 3, 4) clutch regulator and boost valves through the SSA SIG hydraulic circuit to apply the forward (1, 2, 3, 4) clutch. SSD (Shift Solenoid D) directs pressure to the low/reverse/overdrive (4, 5, 6) regulator and boost valves through the SSD SIG hydraulic circuit only when vehicle speed is below 8 km/h (5 mph). SSE (Shift Solenoid E) directs pressure to the multiplex shift valve to direct regulated pressure from the low/reverse/overdrive (4, 5, 6) regulator valve to the low/reverse clutch only when vehicle speed is below 8 km/h (5 mph).





In 2nd gear, the forward (1, 2, 3, 4) clutch remains applied. Shift Solenoid C (SSC) directs pressure to the intermediate (2, 6) clutch regulator valve through the SSC SIG hydraulic circuit to apply the intermediate (2, 6) clutch.





In 3rd gear, the forward (1, 2, 3, 4) clutch remains applied. SSC releases pressure to the intermediate (2, 6) clutch regulator valve. SSB (Shift Solenoid B) directs pressure to the direct (3, 5, R) regulator and boost valves through the SSB SIG hydraulic circuit to apply the direct (3, 5, R) clutch.





In 4th gear, the forward (1, 2, 3, 4) clutch remains applied. SSB (Shift Solenoid B) releases pressure to the direct (3, 5, R) regulator and boost valves. SSD (Shift Solenoid D) directs pressure to the low/reverse/overdrive (4, 5, 6) regulator and boost valves through the SSD SIG hydraulic circuit to apply the overdrive (4, 5, 6) clutch.





In 5th gear, the overdrive (4, 5, 6) clutch remains applied. SSA (Shift Solenoid A) releases pressure to the forward (1, 2, 3, 4) regulator and boost valves. SSB (Shift Solenoid B) directs pressure to the direct (3, 5, R) regulator and boost valves through the SSB SIG hydraulic circuit to apply the direct (3, 5, R) clutch.





In 6th gear, the overdrive (4, 5, 6) clutch remains applied. SSB (Shift Solenoid B) releases pressure to the direct (3, 5, R) regulator and boost valves. SSC (Shift Solenoid C) directs pressure to the intermediate (2, 6) clutch regulator valve through the SSC SIG hydraulic circuit to apply the intermediate (2, 6) clutch.





Forward Clutch Hydraulic Circuits

When the forward (1, 2, 3, 4) clutch is applied in 1st (above 8 km/h [5 mph]), 2nd, 3rd and 4th gears, LINE pressure from the pump is directed to the multiplex shift valve by the manual valve through the DRIVE 1 hydraulic circuit. The multiplex shift valve supplies the forward (1, 2, 3, 4) clutch regulator valve with pressure through the DRIVE 2, CB26FD/CB1234FD and CB1234 SUP hydraulic circuits. The forward (1, 2, 3, 4) clutch regulator valve directs regulated pressure to the forward (1, 2, 3, 4) clutch through the CB1234 hydraulic circuit.





When the forward (1, 2, 3, 4) clutch is applied in LOW position and 1st gear (below 8 km/h [5 mph]), LINE pressure from the pump is directed to the multiplex shift valve by the manual valve through the DRIVE 1 hydraulic circuit. The multiplex shift valve directs the pressure to the multiplex manual valve through the REV DRIVE B circuit. The multiplex manual valve directs the REV DRIVE B pressure to the forward (1, 2, 3, 4) clutch regulator valve through the DRIVE B, CB26FD/CB1234FD and CB1234 SUP circuits. SSA (Shift Solenoid A) supplies varying solenoid pressure to the CB1234 clutch regulator and boost valves. As the CB1234 clutch regulator valve moves, it supplies the forward (1, 2, 3, 4) clutch and CB1234 boost valve with regulated line pressure through the CB1234 circuit. The CB1234 boost valve directs the regulated line pressure to the opposite side of the regulator valve through the CB1234 FDBK circuit for gradual forward (1, 2, 3, 4) clutch engagement.





When the forward (1, 2, 3, 4) clutch is released in 5th and 6th gears, DRIVE 2 pressure is directed to the forward (1, 2, 3, 4) clutch regulator valve. Solenoid pressure is not applied to the forward (1, 2, 3, 4) clutch regulator valve and the regulator valve blocks the DRIVE 2 circuit in this position.





Direct (3, 5, R) Clutch Hydraulic Circuits

When the direct (3, 5, R) clutch is applied in REVERSE, LINE pressure from the pump is directed to the multiplex manual valve by the manual valve through the REV hydraulic circuit. The multiplex manual valve supplies the direct (3, 5, R) clutch regulator valve with pressure through the REV SUPPLY and C35R SUPPLY hydraulic circuits. To apply the direct (3, 5, R) clutch, SSB (Shift Solenoid B) applies varying solenoid pressure to the C35R clutch regulator and boost valves. As the C35R regulator valve moves, it supplies the direct (3, 5, R) clutch and C35R boost valve with regulated line pressure through the C35R circuit. The C35R boost valve directs the regulated line pressure to the opposite side of the C35R clutch regulator valve through the C35R FDBK circuit for gradual direct (3, 5, R) clutch engagement.





When the direct (3, 5, R) clutch is applied in 3rd and 5th gears, LINE pressure from the pump is directed to the multiplex shift valve by the manual valve through the DRIVE 1 hydraulic circuit. The multiplex shift valve directs the pressure to the direct (3, 5, R) clutch regulator valve through the DRIVE 2/C35R SUPPLY circuits. To apply the direct (3, 5, R) clutch, SSB (Shift Solenoid B) applies varying solenoid pressure to the C35R clutch regulator and boost valves. As the C35R regulator valve moves, it supplies the direct (3, 5, R) clutch and C35R boost valve with regulated line pressure through the C35R circuit. The C35R boost valve directs the regulated line pressure to the opposite side of the C35R clutch regulator valve through the C35R FDBK circuit for gradual direct (3, 5, R) clutch engagement.





When the direct (3, 5, R) clutch is released in 1st, 2nd, 4th and 6th gears, C35R SUPPLY pressure is supplied to the direct (3, 5, R) clutch regulator valve. Solenoid pressure is not applied to the direct (3, 5, R) clutch regulator valve and the regulator valve blocks the C35R SUPPLY circuit in this position.





Intermediate (2, 6) Clutch Hydraulic Circuits

When the intermediate (2, 6) clutch is applied in 2nd and 6th gears, LINE pressure from the pump is directed to the multiplex shift valve by the manual valve through the DRIVE 1 hydraulic circuit. The multiplex shift valve supplies the intermediate (2, 6) clutch regulator valve with pressure through the DRIVE 2 and CB26FD/CB1234FD hydraulic circuits. The intermediate (2, 6) clutch regulator valve is controlled by SSC (Shift Solenoid C) and directs regulated pressure to the intermediate (2, 6) clutch through the CB26 hydraulic circuit. The CB26 hydraulic circuit also supplies pressure to the opposite side of the CB26 clutch regulator valve for gradual intermediate (2, 6) clutch engagement. Regulated overdrive (4, 5, 6) clutch pressure is supplied to the intermediate (2, 6) clutch regulator valve in 6th gear to boost the SSC (Shift Solenoid C) solenoid pressure.





When the intermediate (2, 6) clutch is released in 1st, 3rd, 4th and 5th gears, CB26FD/CB1234FD pressure is supplied to the intermediate (2, 6) clutch regulator valve. Solenoid pressure is not applied to the intermediate (2, 6) clutch regulator valve and the regulator valve blocks the CB26FD/CB1234FD circuit in this position.





Low/Reverse Clutch Hydraulic Circuits

When the low/reverse clutch is applied in REVERSE, LINE pressure from the pump is directed to the multiplex shift valve by the manual valve through the REV hydraulic circuit to move the valve. Line pressure is also supplied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve from the pump. The low/reverse/overdrive (4, 5, 6) clutch regulator valve is controlled by SSD (Shift Solenoid D) and directs regulated pressure to the multiplex shift valve. The multiplex shift valve directs the regulated pressure to the low/reverse clutch through the CBLR SUPPLY circuit.





When the low/reverse clutch is applied in PARK, LOW or 1st gear below 8 km/h (5 mph), SSE (Shift Solenoid E) pressure is supplied to the multiplex shift valve to move the valve. LINE pressure is supplied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve from the pump. The low/reverse/overdrive (4, 5, 6) clutch regulator valve is controlled by SSD (Shift Solenoid D) and directs regulated pressure to the multiplex shift valve. The multiplex shift valve directs the regulated pressure to the low/reverse clutch through the CBLR SUPPLY circuit.





When the low/reverse clutch is released in 4th, 5th and 6th gears, LINE pressure is supplied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve from the pump. The low/reverse/overdrive (4, 5, 6) clutch regulator valve is controlled by SSD (Shift Solenoid D) and directs regulated pressure to the multiplex shift valve. The multiplex shift valve directs the regulated pressure to the multiplex manual valve and is then directed to the overdrive (4, 5, 6) clutch.





When the low/reverse clutch is released in 1st (above 8 km/h [5 mph]), 2nd and 3rd gears, LINE pressure is supplied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve. Solenoid pressure is not applied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve and the regulator valve blocks regulated LINE pressure to the multiplex shift valve assembly.





Overdrive Clutch Hydraulic Circuits

When the overdrive clutch is applied in 4th, 5th and 6th gears, LINE pressure is supplied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve from the pump. To apply the overdrive (4, 5, 6) clutch, SSD (Shift Solenoid D) applies varying solenoid pressure to the CBLR/C456 regulator and boost valves. As the CBLR/C456 regulator valve moves, it supplies the multiplex shift valve assembly and CBLR/C456 boost valve with regulated line pressure through the CBLR/C456 SUPPLY circuit. The CBLR/C456 boost valve directs the regulated line pressure to the opposite side of the CBLR/C456 regulator valve through the CBLR/C456 FDBK circuit for gradual overdrive (4, 5, 6) clutch engagement. The multiplex shift valve directs the regulated pressure to the multiplex manual valve through the C456 SUPPLY hydraulic circuit. The multiplex manual valve directs the regulated pressure to the overdrive (4, 5, 6) clutch through the C456 hydraulic circuit. The C456 circuit also supplies pressure to the CB26 clutch regulator valve to boost the pressure from SSC (Shift Solenoid C) in 6th gear.





When the overdrive (4, 5, 6) clutch is released in PARK, REVERSE, NEUTRAL, 1st gear (below 8 km/h [5 mph]) and LOW position, LINE pressure is supplied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve from the pump. The low/reverse/overdrive (4, 5, 6) clutch regulator valve is controlled by SSD (Shift Solenoid D) and directs regulated pressure to the multiplex shift valve through the CBLR/C456 SUPPLY hydraulic circuit. The multiplex shift valve directs the regulated pressure to the low/reverse clutch through the CBLR SUPPLY hydraulic circuit.





When the overdrive (4, 5, 6) clutch is released in 1st (above 8 km/h [5 mph]), 2nd and 3rd gears, LINE pressure is supplied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve. Solenoid pressure is not applied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve and the regulator valve blocks regulated LINE pressure to the multiplex shift valve assembly.