Part 3

Transaxle Operation

3rd Gear Torque Converter Clutch (TCC) Released

Mechanical Operation
Apply components:
^ Forward (1, 2, 3, 4) clutch
^ Direct (3, 5, R) clutch

Planetary Gearset Operation
Front planetary gearset driven components:
^ Planetary carrier
^ Ring gear

Center planetary gearset driven components:
^ Sun gear
^ Planetary carrier
^ Ring gear

Rear planetary gearset driven components:
^ Sun gear
^ Planetary carrier
^ Ring gear

Front planetary gearset held components:
^ Sun gear

Center planetary gearset held components:
^ None

Rear planetary gearset held components:
^ None

3rd Gear Clutch Application Chart:

For component information, refer to Mechanical Components and Functions.

Power Flow:

Hydraulic Operation
Line pressure hydraulic circuits:
^ Line pressure from the pump is supplied to the manual valve.
^ Line pressure is regulated by the pressure regulator valve.
^ The pressure regulator valve is controlled by varying pressure from the line pressure control (LPC) solenoid through the LPC circuit.

Torque converter circuits:
^ Regulated line pressure from the pressure regulator valve is directed to the torque converter clutch (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.
^ Shift solenoid A (SSA) applies pressure to the forward (1, 2, 3, 4) clutch regulator valve to apply the forward clutch.
^ Shift solenoid B (SSB) applies pressure to the direct (3, 5, R) clutch regulator valve to apply the direct clutch.

Clutch hydraulic circuits:
^ Line pressure from the manual valve is directed to the multiplex shift valve through the DRIVE 1 hydraulic circuit.
^ The multiplex shift valve directs DRIVE 1 pressure to the forward (1, 2, 3, 4) clutch regulator valve through the DRIVE 2, CB26FD/CB1234FD and CB1234 SUP hydraulic circuits. The DRIVE 2 hydraulic circuit also feeds the C35R SUPPLY hydraulic circuit which supplies the direct (3, 5, R) clutch regulator valve with pressure.
^ The low/reverse/overdrive (4, 5, 6) clutch regulator valve directs DRIVE 2 pressure to the multiplex shift valve through the VALVE LATCH hydraulic circuit to latch the multiplex shift valve.
^ Regulated CB1234 SUP pressure from the forward (1, 2, 3, 4) clutch regulator valve is directed to the forward (1, 2, 3, 4) clutch through the CB1234 hydraulic circuit to apply the clutch.
^ Regulated C35R SUPPLY pressure from the direct (3, 5, R) clutch regulator valve is directed to the direct (3, 5, R) clutch through the C35R hydraulic circuit to apply the clutch.

For additional hydraulic circuit and information, refer to Hydraulic Circuits.

Electrical Operation
Solenoid operation:

3rd Gear (TCC Released) Solenoid Operation Chart:

6F50 3RD GEAR TORQUE CONVERTER CLUTCH (TCC) RELEASED:

HYDRAULIC DIAGRAM FOLDOUT 6F50 3RD GEAR TORQUE CONVERTER CLUTCH (TCC) RELEASED:

3rd Gear Torque Converter Clutch (TCC) Applied

Mechanical Operation
Apply components:
^ Forward (1, 2, 3, 4) clutch
^ Direct (3, 5, R) clutch
^ Torque converter clutch (TCC)

Planetary Gearset Operation
Front planetary gearset driven components:
^ Planetary carrier
^ Ring gear

Center planetary gearset driven components:
^ Sun gear
^ Planetary carrier
^ Ring gear

Rear planetary gearset driven components:
^ Sun gear
^ Planetary carrier
^ Ring gear

Front planetary gearset held components:
^ Sun gear

Center planetary gearset held components:
^ None

Rear planetary gearset held components:
^ None

3rd Gear TCC Applied Clutch Application Chart:

For component information, refer to Mechanical Components and Functions.

Power Flow:

Hydraulic Operation
Line pressure hydraulic circuits:
^ Line pressure from the pump is supplied to the manual valve.
^ Line pressure is regulated by the pressure regulator valve.
^ The pressure regulator valve is controlled by varying pressure from the line pressure control (LPC) solenoid through the LPC circuit.

Torque converter circuits:
^ Line pressure from the manual valve is directed to the multiplex shift valve through the DRIVE 1 hydraulic circuit.
^ The multiplex shift valve directs DRIVE 1 pressure to the torque converter clutch (TCC) regulator apply valve through the DRIVE 2 hydraulic circuit.
^ When the TCC is applied, the TCC regulator apply valve directs regulated DRIVE 2 pressure to the TCC control valve through the REG APPLY hydraulic circuit. The TCC control valve directs DRIVE 2 pressure to the TCC APPLY hydraulic circuit to apply the TCC.
^ Transmission fluid from the TCC APPLY circuit returns to the TCC control valve unpressurized through the TCC RELEASE circuit and returns to the sump through the EXH port.

Cooler and lubrication hydraulic circuits:
^ Regulated line pressure from the pressure regulator valve is directed to the TCC control valve through the CONV FD hydraulic circuit.
^ The TCC control valve directs transmission fluid from the CONV FD circuit 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.
^ Shift solenoid A (SSA) applies pressure to the forward (1, 2, 3, 4) clutch regulator valve to apply the forward clutch.
^ Shift solenoid B (SSB) applies pressure to the direct (3, 5, R) clutch regulator valve to apply the direct clutch.
^ The TCC solenoid applies pressure to the TCC control valve and the TCC regulator apply valve to apply the TCC.

Clutch hydraulic circuits:
^ Line pressure from the manual valve is directed to the multiplex shift valve through the DRIVE 1 hydraulic circuit.
^ The multiplex shift valve directs DRIVE 1 pressure to the forward (1, 2, 3, 4) clutch regulator valve through the DRIVE 2, CB26FD/CB1234FD and CB1234 SUP hydraulic circuits. The DRIVE 2 hydraulic circuit also feeds the C35R SUPPLY hydraulic circuit which supplies the direct (3, 5, R) clutch regulator valve with pressure.
^ The low/reverse/overdrive (4, 5, 6) clutch regulator valve directs DRIVE 2 pressure to the multiplex shift valve through the VALVE LATCH hydraulic circuit to latch the multiplex shift valve.
^ Regulated CB1234 SUP pressure from the forward (1, 2, 3, 4) clutch regulator valve is directed to the forward (1, 2, 3, 4) clutch through the CB1234 hydraulic circuit to apply the clutch.
^ Regulated C35R SUPPLY pressure from the direct (3, 5, R) clutch regulator valve is directed to the direct (3, 5, R) clutch through the C35R hydraulic circuit to apply the clutch.

For additional hydraulic circuit and information, refer to Hydraulic Circuits.

Electrical Operation
Solenoid operation:

3rd Gear (TCC Applied) Solenoid Operation Chart:

6F50 3RD GEAR TORQUE CONVERTER CLUTCH (TCC) APPLIED:

HYDRAULIC DIAGRAM FOLDOUT 6F50 3RD GEAR TORQUE CONVERTER CLUTCH (TCC) APPLIED: