Part 2

Transaxle Operation

Transaxle Operation Overview

Power Flow

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 (Line Pressure Control) solenoid through the VBS LINE circuit.

Torque converter circuits:

- Regulated line pressure from the main 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).

- 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 fluid from the TCC APPLY circuit (return circuit from the torque converter when the TCC (Torque Converter Clutch) 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 (Line Pressure Control) solenoid applies varying pressure to the main pressure regulator valve through the VBS LINE hydraulic circuit. The LPC (Line Pressure Control) solenoid regulates line pressure by controlling the position of the main pressure regulator valve.

- SSD (Shift Solenoid D) applies pressure to the low reverse/456 regulator and latch valves to apply the low/reverse clutch.

- SSE (Shift Solenoid E) applies pressure to the clutch control bypass valve to position the valve to direct regulated line pressure in the CBR1/C456 circuit to the low/reverse clutch.

Clutch hydraulic circuits:

- Line pressure from the pump is supplied to the low reverse/456 regulator valve. To apply the low/reverse clutch, SSD (Shift Solenoid D) 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 regulator valve through the CBR1/C456 FDBK circuit for gradual low/reverse clutch engagement.

- Regulated line pressure at the clutch control bypass valve in the CBR1/C456 circuit is directed to the low/reverse clutch through the CBR1 circuit to apply the clutch.

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

Electrical Operation

Solenoid operation:

Neutral Position Solenoid Operation Chart

NC = Normally closed

NH = Normally high

NL = Normally low

1st Gear Above 8 km/h (5 mph)

NOTE: The transaxle operates differently in 1st gear above and below 8 km/h (5 mph). For transaxle operation below 8 km/h (5 mph), refer to Manual LOW Position and 1st Gear Below 8 km/h (5 mph).

Mechanical Operation

Apply components:

- Forward (1, 2, 3, 4) clutch

- OWC (One-Way Clutch)

Planetary Gearset Operation

Front planetary gearset driven components:

- Ring gear

- Planetary carrier

Center planetary gearset driven components:

- Sun gear

- Planetary carrier

Rear planetary gearset driven components:

- Ring gear

Front planetary gearset held components:

- Sun gear

Center planetary gearset held components:

- Ring gear

Rear planetary gearset held components:

- Rear planetary carrier (does not contribute to power flow)

1st Gear Above 8 km/h (5 mph) 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 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 (Line Pressure Control) solenoid through the VBS LINE circuit.

Torque converter circuits:

- Regulated line pressure from the main 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).

- 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 fluid from the TCC APPLY circuit (return circuit from the torque converter when the TCC (Torque Converter Clutch) 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 (Line Pressure Control) solenoid applies varying pressure to the main pressure regulator valve through the VBS LINE hydraulic circuit. The LPC (Line Pressure Control) solenoid regulates line pressure by controlling the position of the main pressure regulator valve.

- SSA (Shift Solenoid A) applies pressure to the 1234 regulator and latch valves to apply the forward (1, 2, 3, 4) clutch.

- SSD (Shift Solenoid D) releases pressure to the low reverse/456 regulator and latch valves to release the low/reverse clutch.

- SSE (Shift Solenoid E) releases pressure to the clutch control bypass valve to position it so that regulated line pressure supplied in the CBR1/C456 circuit for 4th, 5th and 6th gear will apply the O/D (Overdrive) (4, 5, 6) clutch.

Clutch hydraulic circuits:

- SSD (Shift Solenoid D) removes pressure from the low reverse/456 regulator and latch valves which positions the valves to block line pressure and release the low/reverse clutch. Solenoid pressure from SSE (Shift Solenoid E) is removed from the clutch control bypass valve to position it to apply the O/D (Overdrive) (4, 5, 6) clutch.

- 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 (Shift Solenoid A) supplies varying solenoid pressure to the 1234 regulator and latch valves. As the 1234 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 regulator valve through the C1234 FDBK circuit for gradual forward (1, 2, 3, 4) clutch engagement.

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 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 (Line Pressure Control) solenoid through the VBS LINE circuit.

Torque converter circuits:

- Regulated line pressure from the main 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).

- 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 fluid from the TCC APPLY circuit (return circuit from the torque converter when the TCC (Torque Converter Clutch) 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 (Line Pressure Control) solenoid applies varying pressure to the main pressure regulator valve through the VBS LINE hydraulic circuit. The LPC (Line Pressure Control) solenoid regulates line pressure by controlling the position of the main pressure regulator valve.

- SSA (Shift Solenoid A) applies pressure to the 1234 regulator and latch valves to apply the forward (1, 2, 3, 4) clutch.

- SSC (Shift Solenoid C) applies pressure to the 26 regulator and latch valves to apply the intermediate (2, 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 (Shift Solenoid A) 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 regulator valve through the C1234 FDBK circuit for gradual forward (1, 2, 3, 4) clutch engagement.

- Line pressure is supplied to the 26 regulator valve by the manual valve in the DRIVE and LOW positions. To apply the intermediate (2, 6) clutch, SSC (Shift Solenoid C) supplies varying solenoid pressure to the 26 regulator and latch valves. As the 26 regulator valve moves, it supplies the intermediate (2, 6) clutch and 26 latch valve with regulated line pressure through the CB26 circuit. The 26 latch valve directs the regulated line pressure to the opposite side of the 26 regulator valve through the CB26 FDBK circuit 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