Hydraulic Operation

Line pressure hydraulic circuits:

• Line pressure from the pump is supplied to the main pressure regulator valve, low reverse/456 regulator valve, manual valve, solenoid regulator valve and control pressure regulator.
• Line pressure is controlled by the position of the main pressure regulator valve.
• The position of the main pressure regulator valve is controlled by varying pressure from the LPC solenoid through the VBS LINE circuit.

Torque converter circuits:

• When the torque converter is applied, line pressure from the manual valve is directed to the TCC regulator valve by the clutch control bypass valve through the DRIVE 2 circuit. The TCC solenoid supplies varying solenoid pressure to the TCC regulator valve and the TCC control valve to position the valves to apply the TCC.
• As the TCC regulator valve moves, it supplies the TCC control valve with regulated line pressure through the REG APPLY circuit. The TCC control valve directs the REG APPLY circuit to the TCC APPLY circuit to apply the TCC.
• Pressure from the torque converter returns to the TCC control valve through the TCC RELEASE circuit.

Cooler and lubrication hydraulic circuits:

• Regulated line pressure from the main pressure regulator valve is directed to the TCC control valve through the CONV FD hydraulic circuit. When the TCC is applied, CONV FD pressure supplies the COOLER FD circuit which circulates through the transmission fluid cooler or the thermal bypass valve.
• In the COOLER FD circuit, transmission fluid flows through the transmission fluid cooler or the thermal bypass valve to the LUBE circuit in the input shaft to supply lubrication to the transaxle.

Solenoid hydraulic circuits:

• The LPC solenoid applies varying pressure to the main pressure regulator valve through the VBS LINE hydraulic circuit. The LPC solenoid regulates line pressure by controlling the position of the main pressure regulator valve.
• SSD applies pressure to the low reverse/456 regulator and latch valves to apply the O/D (4, 5, 6) clutch.
• SSB releases pressure to the 35R regulator and latch valves to release the direct (3, 5, R) clutch.
• SSC applies pressure to the 26 regulator and latch valves to apply the direct (2, 6) clutch.
• The TCC solenoid applies pressure to the TCC control valve and the TCC regulator valve to apply the TCC.

Clutch hydraulic circuits:

• Line pressure from the pump is supplied to the low reverse/456 regulator valve. SSD 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 clutch engagement.
• Regulated line pressure at the clutch control bypass valve in the CBR1/C456 circuit is directed to the O/D (4, 5, 6) clutch through the C456 circuit to apply the clutch.
• Regulated line pressure in the C456 circuit also supplies the latch pressure for the clutch control bypass valve.
• Solenoid pressure from SSB 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.
• 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 supplies varying solenoid pressure to the 26 regulator and latch valves. As the 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 regulator valve through the CB26 FDBK circuit for gradual intermediate (2, 6) clutch engagement.

For additional hydraulic circuit and information, refer to HYDRAULIC CIRCUITS  in this service information.