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:

• 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 released, CONV FD pressure is directed to the TCC RELEASE circuit by the TCC  control valve. Pressure from the TCC RELEASE circuit releases the TCC  .
• Fluid from the TCC RELEASE circuit returns to the TCC  control valve through the TCC APPLY circuit.

Cooler and lubrication hydraulic circuits:

• The TCC  control valve directs fluid from the TCC APPLY circuit (return circuit from the torque converter when the TCC  is released) to the COOLER FD circuit.
• 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.
• SSA  applies pressure to the 1234 regulator and latch valves to apply the forward (1, 2, 3, 4) clutch.
• SSB  releases pressure to the 35R clutch regulator and latch valves to release the direct (3, 5, R) clutch.
• SSD  applies pressure to the low reverse/456 regulator and latch valves to apply the O/D  (4, 5, 6) clutch.

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  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.
• 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 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 also supplies the latch pressure for the clutch control bypass valve.

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