Hydraulic Operation

Line pressure hydraulic circuits:

• Line pressure is supplied to the manual valve by the pump through the LINE hydraulic circuit.
• Line pressure is regulated by the pressure regulator valve.
• The pressure regulator valve is controlled by varying pressure from the LPC  solenoid through the LPC  circuit.

Torque converter circuits:

• Regulated line pressure from the 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  .
• Transmission fluid from the TCC  RELEASE returns to the TCC  control valve through the TCC  APPLY circuit.

Cooler and lubrication hydraulic circuits:

• The TCC  control valve directs transmission fluid from the TCC  APPLY circuit (return circuit from the torque converter when the TCC  is released) to the COOLER FEED circuit.
• In the COOLER FEED circuit, transmission fluid flows through the transmission fluid cooler or the thermal bypass valve to the LUBE circuit.

Solenoid hydraulic circuits:

• The LPC  solenoid applies varying pressure to the pressure control valve through the LPC  hydraulic circuit. The LPC  solenoid regulates line pressure by controlling the position of the pressure regulator valve.
• SSB  applies pressure to the direct (3, 5, R) regulator valve to apply the direct clutch.
• SSD  applies pressure to the low/reverse/overdrive (4, 5, 6) regulator valve to apply the low/reverse clutch.
• SSE  applies pressure to the multiplex shift valve to position the valve against the spring and direct regulated CBLR/C456 SUPPLY pressure to the low/reverse clutch.

Clutch hydraulic circuits:

• Line pressure supplied to the manual valve is directed to the multiplex shift valve and the multiplex manual valve through the REV hydraulic circuit.
• The multiplex manual valve directs REV pressure to the direct (3, 5, R) clutch regulator valve through the REV SUPPLY and C35R SUPPLY hydraulic circuits. To apply the direct (3, 5, R) clutch, SSB  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.
• Line pressure from the pump is supplied to the low/reverse/overdrive (4, 5, 6) regulator valve.
• Regulated line pressure from the low/reverse/overdrive (4, 5, 6) regulator valve is sent to the multiplex shift valve assembly through the CBLR/C456 SUPPLY hydraulic circuit.
• The multiplex shift valve directs the transmission fluid to the low/reverse clutch through the CBLR hydraulic circuit.

For additional hydraulic circuit information, refer to HYDRAULIC CIRCUITS .