Part 2
Transaxle Operation
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 LPC (Line Pressure Control) solenoid through the LPC (Line Pressure Control) circuit.
Torque converter circuits:
- Regulated line pressure from the pressure regulator valve is directed to the TCC (Torque Converter Clutch) control valve through the CONV FD hydraulic circuit.
- When the TCC (Torque Converter Clutch) is released, CONV FD pressure is directed to the TCC RELEASE circuit by the TCC (Torque Converter Clutch) control valve. Pressure from the TCC RELEASE circuit releases the TCC (Torque Converter Clutch) .
- Transmission fluid from the TCC RELEASE returns to the TCC (Torque Converter Clutch) control valve through the TCC APPLY circuit.
Cooler and lubrication hydraulic circuits:
- The TCC (Torque Converter Clutch) control valve directs transmission fluid from the TCC APPLY circuit (return circuit from the torque converter when the TCC (Torque Converter Clutch) 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 (Line Pressure Control) solenoid applies varying pressure to the pressure control valve through the LPC (Line Pressure Control) hydraulic circuit. The LPC (Line Pressure Control) solenoid regulates line pressure by controlling the position of the pressure regulator valve.
- SSA (Shift Solenoid A) applies pressure to the forward (1, 2, 3, 4) clutch regulator valve to apply the forward 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.
- 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.
For additional hydraulic circuit and information, refer to Hydraulic Circuits Hydraulic Circuits.
Electrical Operation
Solenoid operation:
1st Gear Above 8 km/h (5 mph) Solenoid Operation Chart
NC = Normally closed
NH = Normally high
NL = Normally low
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
For component information, refer to Mechanical Components and Functions 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 LPC (Line Pressure Control) solenoid through the LPC (Line Pressure Control) circuit.
Torque converter circuits:
- Regulated line pressure from the pressure regulator valve is directed to the TCC (Torque Converter Clutch) control valve through the CONV FD hydraulic circuit.
- When the TCC (Torque Converter Clutch) is released, CONV FD pressure is directed to the TCC RELEASE circuit by the TCC (Torque Converter Clutch) control valve. Pressure from the TCC RELEASE circuit releases the TCC (Torque Converter Clutch) .
- Transmission fluid from the TCC RELEASE returns to the TCC (Torque Converter Clutch) control valve through the TCC APPLY circuit.
Cooler and lubrication hydraulic circuits:
- The TCC (Torque Converter Clutch) control valve directs transmission fluid from the TCC APPLY circuit (return circuit from the torque converter when the TCC (Torque Converter Clutch) 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 (Line Pressure Control) solenoid applies varying pressure to the pressure control valve through the LPC (Line Pressure Control) hydraulic circuit. The LPC (Line Pressure Control) solenoid regulates line pressure by controlling the position of the pressure regulator valve.
- SSA (Shift Solenoid A) applies pressure to the forward (1, 2, 3, 4) clutch regulator valve to apply the forward clutch.
- SSC (Shift Solenoid C) 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.
- 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 CB26FD/CB1234FD 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. The CB26 hydraulic circuit also supplies pressure to the opposite side of the CB26 clutch regulator valve for gradual intermediate (2, 6) clutch engagement.
For additional hydraulic circuit and information, refer to Hydraulic Circuits Hydraulic Circuits.
Electrical Operation
Solenoid operation:
2nd Gear Solenoid Operation Chart
NC = Normally closed
NH = Normally high
NL = Normally low
3rd Gear
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 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 LPC (Line Pressure Control) solenoid through the LPC (Line Pressure Control) circuit.
Torque converter circuits:
- Regulated line pressure from the pressure regulator valve is directed to the TCC (Torque Converter Clutch) control valve through the CONV FD hydraulic circuit.
- When the TCC (Torque Converter Clutch) is released, CONV FD pressure is directed to the TCC RELEASE circuit by the TCC (Torque Converter Clutch) control valve. Pressure from the TCC RELEASE circuit releases the TCC (Torque Converter Clutch) .
- Transmission fluid from the TCC RELEASE returns to the TCC (Torque Converter Clutch) control valve through the TCC APPLY circuit.
Cooler and lubrication hydraulic circuits:
- The TCC (Torque Converter Clutch) control valve directs transmission fluid from the TCC APPLY circuit (return circuit from the torque converter when the TCC (Torque Converter Clutch) 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 (Line Pressure Control) solenoid applies varying pressure to the pressure control valve through the LPC (Line Pressure Control) hydraulic circuit. The LPC (Line Pressure Control) solenoid regulates line pressure by controlling the position of the pressure regulator valve.
- SSA (Shift Solenoid A) applies pressure to the forward (1, 2, 3, 4) clutch regulator valve to apply the forward clutch.
- SSB (Shift Solenoid B) 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.
- 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.
- To apply the direct (3, 5, R) clutch, SSB (Shift Solenoid B) 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.
For additional hydraulic circuit and information, refer to Hydraulic Circuits Hydraulic Circuits.
Electrical Operation
Solenoid operation:
3rd Gear (TCC (Torque Converter Clutch) Released) Solenoid Operation Chart
NC = Normally closed
NH = Normally high
NL = Normally low
