Part 2

Transaxle Operation

2nd Gear

Mechanical Operation
Apply components:
^ Forward (1, 2, 3, 4) clutch
^ intermediate (2, 6) 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:
^ Planetary carrier
^ Ring gear

Front planetary gearset held components:
^ Sun gear

Center planetary gearset held components:
^ None

Rear planetary gearset held components:
^ Sun gear

2nd Gear Clutch Application Chart

2nd Gear Clutch Application Chart:

For component information, refer to Mechanical Components and Functions.

Power Flow

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 C (SSC) applies pressure to the intermediate (2, 6) clutch regulator valve to apply the intermediate 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 and the intermediate (2, 6) clutch regulator valves through the DRIVE 2 and CB26FD/CB1234FD hydraulic circuits. The CB26FD/CB1234FD circuit feeds the CB1234 SUP hydraulic circuit which feeds the forward (1, 2, 3, 4) clutch regulator valve.
^ 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 DRIVE 2 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 DRIVE 2 pressure from the intermediate (2, 6) clutch regulator valve is directed to the intermediate (2, 6) clutch through the CB26 hydraulic circuit to apply the clutch.

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

Electrical Operation
Solenoid operation:

2nd Gear Solenoid Operation Chart:

6F50 2ND GEAR:

HYDRAULIC DIAGRAM FOLDOUT 6F50 2ND GEAR: