Hydraulic Circuits

Hydraulic Circuits

Hydraulic Circuit Identification and Function





Hydraulic Circuit Identification Chart


































Line Pressure Hydraulic Circuits

Line pressure is controlled by the Line Pressure Control (LPC) solenoid, which is controlled by the PCM. This effects shift feel and apply component operation.

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

When the manual valve is in the reverse position, it supplies the clutch control bypass valve with line pressure to position it to supply line pressure to the direct (3, 5, R) regulator valve and regulated line pressure to the low/reverse clutch to apply the clutch.

When the manual valve is in the DRIVE or LOW positions, it directs line pressure from the LINE circuit to the DRIVE circuit to supply line pressure to the:

- Clutch control bypass valve

- Forward (1, 2, 3, 4) regulator valve

- Intermediate (2, 6) regulator valve

- Torque Converter Clutch (TCC) regulator valve

- Direct (3, 5, R) clutch regulator valve





Torque Converter Clutch (TCC) And Lubrication Hydraulic Circuits

Pressure for TCC (Torque Converter Clutch) release is supplied by the main pressure regulator valve to the TCC (Torque Converter Clutch) control valve through the CONV FD circuit. The CONV FD circuit also supplies lubrication for the differential. When the TCC (Torque Converter Clutch) is released, the TCC (Torque Converter Clutch) control valve is positioned by the TCC (Torque Converter Clutch) solenoid to direct CONV FD pressure to the TCC RELEASE circuit to release the TCC (Torque Converter Clutch). TCC RELEASE pressure returns to the TCC (Torque Converter Clutch) control valve through the TCC APPLY circuit. The position of the TCC (Torque Converter Clutch) control valve opens the TCC APPLY circuit to the COOLER FD circuit which allows the transmission fluid returned from the torque converter to cycle through the thermal bypass valve circuit when the Transmission Fluid Temperature (TFT) is below 80°C-93°C (176°F-200°F) or the transmission fluid cooler when the temperature is above 80°C-93°C (176°F-200°F).

Return transmission fluid from the thermal bypass valve or the transmission fluid cooler supplies transaxle lubrication through the LUBE circuit which runs through the input shaft.

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

The position of the TCC (Torque Converter Clutch) control valve is controlled by pressure from the TCC (Torque Converter Clutch) solenoid through the VBS TCC circuit. The TCC (Torque Converter Clutch) solenoid is controlled by the PCM.





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 valves to position the valves to apply the TCC (Torque Converter Clutch) clutch. Regulated line pressure is supplied to the TCC (Torque Converter Clutch) control valve through the REG APPLY circuit by the TCC (Torque Converter Clutch) regulator valve. The TCC (Torque Converter Clutch) control valve directs the regulated line pressure from the REG APPLY circuit to the TCC APPLY circuit to apply the TCC (Torque Converter Clutch). The TCC (Torque Converter Clutch) control valve blocks the TCC RELEASE circuit to maintain pressure in the TCC APPLY circuit. The TCC (Torque Converter Clutch) control valve directs the CONV FD circuit to the COOLER FD circuit to allow the transmission fluid to flow through the thermal bypass valve or the transmission fluid cooler to the LUBE circuit to lubricate the transaxle.





Solenoid Hydraulic Circuits

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

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

In the PARK and NEUTRAL positions, Shift Solenoid D (SSD) applies varying pressure to the low reverse/456 regulator and latch valves through the VBS CBR1/456 hydraulic circuit to position the valves to apply the low/reverse clutch. ON/OFF Shift Solenoid E (SSE) directs pressure to the clutch control bypass valve to position the valve to direct regulated line pressure from the low reverse/456 regulator valve to the low/reverse clutch.





In the REVERSE position, SSD (Shift Solenoid D) applies varying pressure to the low reverse/456 regulator and latch valves through the VBS CBR1/456 hydraulic circuit to position the valves to apply the low/reverse clutch. ON/OFF SSE (Shift Solenoid E) directs pressure to the clutch control bypass valve to position the valve to direct regulated line pressure from the low reverse/456 regulator valve to the low/reverse clutch. The clutch control bypass valve also directs line pressure from the REVERSE circuit to the 35R regulator valve through the C35R FD and DRIVE 2/C35R FD circuits. Shift Solenoid B (SSB) directs varying pressure to the 35R regulator and latch valves through the VBS C35R hydraulic circuit to apply the direct (3, 5, R) clutch.





In 1st gear, Shift Solenoid A (SSA) applies varying pressure to the 1234 clutch regulator and latch valves through the VBS C1234 hydraulic circuit to apply the forward (1, 2, 3, 4) clutch.

When vehicle speed is below 8 km/h (5 mph), or the selector lever is in the manual low position, SSD (Shift Solenoid D) applies varying pressure to the low reverse/456 regulator and latch valves through the VBS CBR1/456 hydraulic circuit to position the valves to apply the low/reverse clutch. ON/OFF SSE (Shift Solenoid E) directs pressure to the clutch control bypass valve to position the valve to direct regulated line pressure from the low reverse/456 regulator valve to the low/reverse clutch. As vehicle speed increases above 8 km/h (5 mph) in 1st gear, SSD (Shift Solenoid D) removes pressure from the low reverse/456 regulator and latch valves and SSE (Shift Solenoid E) removes pressure from the clutch control bypass valve to release the low/reverse clutch.









In 2nd gear, the forward (1, 2, 3, 4) clutch remains applied. SSC (Shift Solenoid C) applies varying pressure to the 26 regulator and latch valves through the VBS CB26 hydraulic circuit to apply the intermediate (2, 6) clutch.





In 3rd gear, the forward (1, 2, 3, 4) clutch remains applied. SSC (Shift Solenoid C) releases pressure to the 26 regulator and latch valves to release the intermediate (2, 6) clutch. SSB (Shift Solenoid B) directs pressure to the 35R regulator and latch valves through the VBS CB26 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 35R regulator and latch valves. SSD (Shift Solenoid D) directs pressure to the low reverse/456 regulator and latch valves through the VBS CBR1/456 hydraulic circuit. With SSE (Shift Solenoid E) released, the clutch control bypass valve directs the regulated line pressure from the low reverse/456 regulator valve to the Overdrive (O/D) (4, 5, 6) clutch to apply the clutch.





In 5th gear, the O/D (Overdrive) (4, 5, 6) clutch remains applied. SSA (Shift Solenoid A) releases pressure to the 1234 regulator and latch valves to release the forward (1, 2, 3, 4) clutch. SSB (Shift Solenoid B) directs pressure to the 35R regulator and latch valves through the VBS C35R hydraulic circuit to apply the direct (3, 5, R) clutch.





In 6th gear, the O/D (Overdrive) (4, 5, 6) clutch remains applied. SSB (Shift Solenoid B) releases pressure to the 35R regulator and latch valves. SSC (Shift Solenoid C) applies varying pressure to the 26 clutch regulator and latch valves through the VBS CB26 hydraulic circuit to apply the intermediate (2, 6) clutch.

The TCC (Torque Converter Clutch) can be applied in 4th, 5th or 6th gear. To apply the TCC (Torque Converter Clutch) , the TCC (Torque Converter Clutch) solenoid applies pressure to the TCC (Torque Converter Clutch) regulator valve and the TCC (Torque Converter Clutch) control valve to position the valves to apply the clutch.





During a mechanical, hydraulic or electrical failure with the manual lever in the DRIVE position, the transaxle defaults to 5th gear. When the transaxle is in 5th gear failsafe, the PCM does not control the shift solenoids and they default to their normal state (maximum pressure, minimum pressure, on or off). The LPC (Line Pressure Control) solenoid defaults to maximum pressure, SSA (Shift Solenoid A) defaults to minimum pressure, SSB (Shift Solenoid B) defaults to maximum pressure, SSC (Shift Solenoid C) defaults to minimum pressure, SSD (Shift Solenoid D) defaults to maximum pressure and the TCC (Torque Converter Clutch) solenoid defaults to minimum pressure.

With SSB (Shift Solenoid B) applying maximum pressure to the direct (3, 5, R) regulator and latch valves, the direct (3, 5, R) clutch is applied. With SSD (Shift Solenoid D) applying maximum pressure to the low reverse/456 regulator and latch valves with SSE (Shift Solenoid E) in the OFF position, the O/D (Overdrive) (4, 5, 6) clutch is applied, providing 5th gear.





Forward (1, 2, 3, 4) Clutch Hydraulic Circuits

Line pressure is supplied to the 1234 regulator valve by the manual valve in the DRIVE and LOW position. To apply the forward (1, 2, 3, 4) clutch, SSA (Shift Solenoid A) supplies varying solenoid pressure to the 1234 regulator and latch valves. As the regulator valve moves, it supplies the forward (1, 2, 3, 4) clutch and 1234 latch valve with regulated line pressure through the C1234 circuit. The 1234 latch valve directs the regulated line pressure to the opposite side of the 1234 regulator valve through the C1234 FDBK circuit for gradual forward (1, 2, 3, 4) clutch engagement. The forward (1, 2, 3, 4) clutch is applied in 1st, 2nd, 3rd and 4th gears and manual LOW position.





When the forward (1, 2, 3, 4) clutch is released in 5th and 6th gears, solenoid pressure from SSA (Shift Solenoid A) is removed from the 1234 regulator and latch valves which positions the valves to block line pressure and release the forward (1, 2, 3, 4) clutch. When the forward (1, 2, 3, 4) clutch is released in the PARK, REVERSE or NEUTRAL position, line pressure is not supplied to the forward (1, 2, 3, 4) regulator valve.

In the released position, exhaust backfill supplied to the 1234 regulator and latch valves by the manual valve through the EXH BF circuit is directed to the forward (1, 2, 3, 4) clutch to fill the unused circuits with unpressurized transmission fluid.





Direct (3, 5, R) Clutch Hydraulic Circuits

When the direct (3, 5, R) clutch is applied in the REVERSE position, line pressure from the manual valve is directed to the clutch control bypass valve through the REVERSE circuit. Line pressure in the REVERSE circuit positions the clutch control bypass valve and supplies line pressure to apply the direct (3, 5, R) clutch. Line pressure from the clutch control bypass valve is supplied to the 35R regulator valve through the C35R FD circuit, DRIVE 2/C35R FD shuttle ball and DRIVE 2/C35R FD circuit.

To apply the direct (3, 5, R) clutch, SSB (Shift Solenoid B) applies varying solenoid pressure to the 35R regulator and latch valves. As the regulator valve moves, it supplies the direct (3, 5, R) clutch and 35R latch valve with regulated line pressure through the C35R circuit. The 35R latch valve directs the regulated line pressure to the opposite side of the 35R 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 gear, line pressure from the pump is directed to the clutch control bypass valve by the manual valve through the DRIVE hydraulic circuit. The clutch control bypass valve directs the pressure to the 35R regulator valve through the TCC (Torque Converter Clutch) regulator valve, DRIVE 2 circuit, DRIVE 2/C35R FD shuttle ball and DRIVE 2/C35R FD circuit.

To apply the direct (3, 5, R) clutch, SSB (Shift Solenoid B) applies varying solenoid pressure to the 35R regulator and latch valves. As the 35R regulator valve moves, it supplies the direct (3, 5, R) clutch and 35R latch valve with regulated line pressure through the C35R circuit. The 35R latch valve directs the regulated line pressure to the opposite side of the regulator valve through the C35R FDBK circuit for gradual direct (3, 5, R) clutch engagement.





When the direct (3, 5, R) clutch is released, solenoid pressure from SSB (Shift Solenoid B) is removed from the 35R regulator and latch valves which positions the valves to block line pressure and release the direct (3, 5, R) clutch. When the direct (3, 5, R) clutch is released in the PARK or NEUTRAL position, line pressure is not supplied to the 35R regulator valve.

Compensator feed pressure is supplied to the 35R regulator valve from the control pressure regulator through the COMP FD circuit and is supplied to the opposite side of the direct (3, 5, R) and O/D (Overdrive) (4, 5, 6) clutch pistons to keep the clutches from centrifugally applying. COMP FD pressure is only about 83 kPa (12 psi) and is applied through all gears. When the direct (3, 5, R) clutch is released, COMP FD is applied by the 35R regulator valve to the direct (3, 5, R) clutch to fill the unused circuits.





Intermediate (2, 6) Clutch Hydraulic Circuits

Line pressure is supplied to the 26 regulator valve by the manual valve in the DRIVE and LOW positions. To apply the intermediate (2, 6) clutch, SSC (Shift Solenoid C) supplies varying solenoid pressure to the 26 regulator and latch valves. As the 26 regulator valve moves, it supplies the intermediate (2, 6) clutch and 26 latch valve with regulated line pressure through the CB26 circuit. The 26 latch valve directs the regulated line pressure to the opposite side of the 26 regulator valve through the CB26 FDBK circuit for gradual intermediate (2, 6) clutch engagement. The intermediate (2, 6) clutch is applied in 2nd and 6th gears.





When the intermediate (2, 6) clutch is released in 1st, 3rd, 4th and 5th gears and manual LOW position, solenoid pressure from SSC (Shift Solenoid C) is removed from the 26 regulator and latch valves which positions the valves to block line pressure and release the intermediate (2, 6) clutch. When the intermediate (2, 6) clutch is released in the PARK, REVERSE or NEUTRAL position, line pressure is not supplied to the 26 regulator valve.

In the released position, exhaust backfill supplied to the 26 clutch regulator valve by the manual valve through the EXH BF circuit is directed to the intermediate (2, 6) clutch and 26 latch valve to fill the unused circuits with unpressurized transmission fluid.





Low/Reverse Clutch Hydraulic Circuits

Line pressure is supplied to the low reverse/456 regulator valve by the pump in every gear and manual lever position. To apply the low/reverse clutch, SSD (Shift Solenoid D) supplies varying solenoid pressure to the low reverse/456 regulator and latch valves. As the low reverse/456 regulator valve moves, it supplies the clutch control bypass valve and low reverse/456 latch valve with regulated line pressure through the CBR1/C456 circuit. The low reverse/456 latch valve directs the regulated line pressure to the opposite side of the 456 regulator valve through the CBR1/C456 FDBK circuit for gradual low reverse/456 clutch engagement. The low/reverse clutch is applied in PARK, REVERSE, NEUTRAL, 1st gear below 8 km/h (5 mph) and manual LOW position.

In REVERSE, both solenoid pressure from ON/OFF SSE (Shift Solenoid E) and line pressure from the manual valve in the REVERSE circuit apply pressure to the clutch control bypass valve to position it for low/reverse clutch application. Regulated line pressure from the CBR1/C456 circuit is directed to the low/reverse clutch by the clutch control bypass valve through the CBR1 circuit to apply the low/reverse clutch.





When the low/reverse clutch is applied in PARK, NEUTRAL, LOW or 1st gear below 8 km/h (5 mph), only pressure from ON/OFF SSE (Shift Solenoid E) , positions the clutch control bypass valve. Line pressure from the REVERSE circuit is not supplied by the manual valve.





When the low/reverse clutch is released in 1st gear above 8 km/h (5 mph), 2nd and 3rd gears, solenoid pressure from SSD (Shift Solenoid D) is removed from the low reverse/456 regulator and latch valves which positions the valves to block line pressure and release the low/reverse clutch. Solenoid pressure from SSE (Shift Solenoid E) is removed from the clutch control bypass valve to position it to apply the O/D (Overdrive) (4, 5, 6) clutch.

When the low/reverse clutch is released in 1st gear above 8 km/h (5 mph), 2nd and 3rd gears, exhaust backfill supplied to the low reverse/456 clutch regulator valve and the clutch control bypass valve by the manual valve through the EXH BF circuit is directed to the low reverse/456 latch valve, low/reverse clutch and O/D (Overdrive) (4, 5, 6) clutch to fill the unused circuits with unpressurized transmission fluid.

When the low/reverse clutch is released in 4th, 5th and 6th gears, the low reverse/456 regulator valve supplies regulated pressure to the clutch control bypass valve through the CBR1/C456 circuit. With ON/OFF SSE (Shift Solenoid E) in the OFF position, the regulated pressure is directed to the O/D (Overdrive) (4, 5, 6) clutch.





Overdrive (4, 5, 6) Clutch Hydraulic Circuits

Line pressure is supplied to the low reverse/456 regulator valve by the pump in every gear and manual lever position. To apply the low/reverse clutch, SSD (Shift Solenoid D) supplies varying solenoid pressure to the low reverse/456 regulator and latch valves. As the regulator valve moves, it supplies the clutch control bypass valve and low reverse/456 latch valve with regulated line pressure through the CBR1/C456 circuit. The low reverse/456 latch valve directs the regulated line pressure to the opposite side of the low reverse/456 regulator valve through the CBR1/C456 FDBK circuit for gradual O/D (Overdrive) (4, 5, 6) clutch engagement.

To apply the O/D (Overdrive) (4, 5, 6) clutch, the position of the clutch control bypass valve allows the regulated line pressure in the CBR1/C456 circuit to supply the C456 circuit, applying the O/D (Overdrive) (4, 5, 6) clutch. Clutch control bypass valve latch pressure is supplied by the C456 circuit. The O/D (Overdrive) (4, 5, 6) clutch is applied in 4th, 5th and 6th gears.





When the O/D (Overdrive) (4, 5, 6) clutch is released in 1st gear above 8 km/h (5 mph), 2nd and 3rd gears, solenoid pressure from SSD (Shift Solenoid D) is removed from the low reverse/456 regulator and latch valves which positions the valves to block line pressure and release the O/D (Overdrive) (4, 5, 6) clutch.

When the O/D (Overdrive) (4, 5, 6) clutch is released in 1st gear above 8 km/h (5 mph), 2nd and 3rd gears, exhaust backfill supplied to the low reverse/456 clutch regulator valve and the clutch control bypass valve by the manual valve through the EXH BF circuit is directed to the low reverses latch valve, low/reverse clutch and O/D (Overdrive) (4, 5, 6) clutch to fill the unused circuits with unpressurized transmission fluid.

When the O/D (Overdrive) (4, 5, 6) clutch is released in PARK, REVERSE, NEUTRAL and 1st gear below 8 km/h (5 mph), the low reverse/456 regulator valve supplies regulated pressure to the clutch control bypass valve through the CBR1/C456 circuit. With ON/OFF SSE (Shift Solenoid E) in the ON position, the regulated pressure is directed to the low/reverse clutch.