Hydraulic Circuits

Hydraulic Circuits


Hydraulic Circuit Identification and Function











































































































Line Pressure Hydraulic Circuits

The PCM controls line pressure with the Line Pressure Control (LPC) solenoid. This effects 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 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 control valve as CONV FD pressure. During TCC release, the TCC control valve sends the transmission fluid to the torque converter to release the clutch. The transmission fluid returns to the TCC control valve from the torque converter and is directed to the transmission fluid cooler on the COOLER FEED circuit.





When the TCC clutch is applied the TCC solenoid applies pressure to the TCC control and regulator apply valves. The TCC 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 solenoid. The TCC solenoid applies hydraulic pressure to the TCC 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 control valve by the TCC regulator apply valve through the REG APPLY circuit. The TCC 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 control valve through the TCC RELEASE hydraulic circuit. The TCC control valve opens the TCC RELEASE circuit to exhaust, so the TCC RELEASE circuit is not pressurized when the TCC is applied.





When the TCC is released, The TCC solenoid does not apply hydraulic pressure to the TCC control or regulator apply valves. The TCC 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 control valve through the TCC APPLY circuit.

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






Solenoid Hydraulic Circuits

LINE pressure from the pump is directed to the individual shift, TCC and LPC 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 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 directs pressure to the low/reverse/overdrive (4, 5, 6) regulator and boost valves through the SSD SIG hydraulic circuit. 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. 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 directs pressure to the low/reverse/overdrive (4, 5, 6) regulator and boost valves through the SSD SIG hydraulic circuit. 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 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 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 5 km/h (3 mph). 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 only when vehicle speed is below 5 km/h (3 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 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 releases pressure to the direct (3, 5, R) regulator and boost valves. SSD 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 releases pressure to the forward (1, 2, 3, 4) regulator and boost valves. 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 6th gear, the overdrive (4, 5, 6) clutch remains applied. SSB releases pressure to the direct (3, 5, R) regulator and boost valves. SSC 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 5 km/h [3 mph]), 2nd, 3rd, and 4th gear, 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 5 km/h [3 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. 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 released in 5th and 6th gear, 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. The direct (3, 5, R) clutch regulator valve is controlled by SSB and directs regulated C35R SUPPLY pressure to the direct (3, 5, R) clutch through the C35R hydraulic circuit.





When the direct (3, 5, R) clutch is applied in 3rd and 5th gear, 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. The direct (3, 5, R) clutch regulator valve is controlled by SSB and directs regulated pressure to the direct (3, 5, R) clutch through the C35R hydraulic circuit.





When the direct (3, 5, R) clutch is released in 1st, 2nd, 4th and 6th gear, 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 gear, 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 and directs regulated pressure to the intermediate (2, 6) clutch through the CB26 hydraulic circuit. Regulated overdrive (4, 5, 6) clutch pressure is supplied to the intermediate (2, 6) clutch regulator valve in 6th gear to boost the SSC solenoid pressure.





When the intermediate (2, 6) clutch is released in 1st, 3rd, 4th and 5th gear, 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 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 5 km/h (3 mph), SSE 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 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 gear, 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 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 5 km/h [3 mph]), 2nd and 3rd gear, 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 gear, 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 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 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 in 6th gear.





When the overdrive (4, 5, 6) clutch is released in PARK, REVERSE, NEUTRAL, 1st gear (below 5 km/h [3 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 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 5 km/h [3 mph]), 2nd and 3rd gear, 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.