Part 1

Transaxle Operation

Part 1 of 3

Transaxle Operation Overview Torque Converter
This transaxle uses a torque converter with the following elements:
^ Impeller
^ Turbine
^ Reactor
^ Torque Converter Clutch (TCC)

Planetary Gearsets
Operation of this transaxle involves the use of the following planetary gearsets:
^ Front
^ Center
^ Rear

Apply Clutches
This transaxle uses the following clutches to operate the 3 planetary gearsets:
^ Forward (1, 2, 3, 4) clutch
^ Low/reverse clutch
^ Low One-Way Clutch (OWC)
^ Direct (3, 5, R) clutch
^ Intermediate (2, 6) clutch
^ Overdrive (O/D) (4, 5, 6) clutch

Hydraulic System
The hydraulic system of this transaxle consists of the following components:
^ Transmission fluid pump with filter
^ Transmission fluid filler tube with transmission fluid level indicator
^ Main control assembly (valve body and solenoid body)

Electronic Operation
The PCM controls the operation of the transaxle with the following solenoids:
^ Line Pressure Control (LPC) solenoid
^ Shift Solenoid A (SSA)
^ Shift Solenoid B (SSB)
^ Shift Solenoid C (SSC)
^ Shift Solenoid D (SSD)
^ Shift Solenoid E (SSE)
^ TCC solenoid

For solenoid information, refer to Transaxle Electronic Control System.

Park Position

Park Position:

Mechanical Operation
Apply components:
^ Park pawl engaged, holding the final drive assembly stationary
^ Low/reverse clutch applied

Planetary Gearset Operation
Front planetary gearset driven components:
^ None Center planetary gearset driven components:
^ Sun gear

Rear planetary gearset driven components:
^ None

Park Position Clutch Application Chart

Park Position Clutch Application Chart:

For component information, refer to Mechanical Components and Functions.

Park Position Power Flow

Park Position Power Flow:

Front planetary gearset held components:
^ Planetary carrier assembly (splined to final drive assembly, held stationary by park pawl)

Center planetary gearset held components:
^ Center ring gear (splined to rear planetary carrier)

Rear planetary gearset held components:
^ Planetary carrier
^ Rear ring gear (splined to front carrier)

Hydraulic Operation
Line pressure hydraulic circuits:
^ Line pressure from the pump is supplied to the low/reverse/overdrive (4, 5, 6) regulator valve.
^ 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 CONY FD hydraulic circuit.
^ When the TCC is released, CONY FD pressure is directed to the TCC RELEASE circuit by the TCC control valve. Pressure from the TCC RELEASE circuit releases the TCC.
^ 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 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.
^ 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 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 fluid to the low/reverse clutch through the CBLR hydraulic circuit.

Electrical Operation
Solenoid operation:

Park Position Solenoid Operation Chart

Park Position Solenoid Operation Chart:

6F50 PARK POSITION:

HYDRAULIC DIAGRAM FOLDOUT6F50 PARK POSITION:

Reverse Position

Mechanical Operation
Apply components:
^ Low/reverse clutch applied
^ Direct (3, 5, R) clutch applied

Planetary Gearset Operation
Front planetary gearset driven components:
^ Planetary carrier Center planetary gearset driven components:
^ Sun gear (does not contribute to power flow)

Rear planetary gearset driven components:
^ Sun gear

Front planetary gearset held components:
^ None

Center planetary gearset held components:
^ Center ring

Rear planetary gearset held components:
^ Planetary carrier

Reverse Position Clutch Application Chart

Reverse Position Clutch Application Chart:

For component information, refer to Mechanical Components and Functions.

Reverse Position Power Flow

Reverse Position Power Flow:

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 CONY FD hydraulic circuit.
^ When the TCC is released, CONY 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 transmission fluid to the direct (3, 5, R) clutch regulator valve through the REV SUPPLY and C35R SUPPLY hydraulic circuits. The (3, 5, R) regulator valve is controlled by SSB and applies regulated C35R SUPPLY pressure to the direct (3, 5, R) clutch.
^ 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.

Electrical Operation
Solenoid operation:

Reverse Position Solenoid Operation Chart

Reverse Position Solenoid Operation Chart:

6F50 REVERSE POSITION:

HYDRAULIC DIAGRAM FOLDOUT6F50 REVERSE POSITION:

Neutral Position

Mechanical Operation
Apply components:
^ Low/reverse clutch applied

Neutral Position Clutch Application Chart

Neutral Position Clutch Application Chart:

For component information, refer to Mechanical Components and Functions.

Planetary Gearset Operation
Front planetary gearset driven components:
^ None Center planetary gearset driven components:
^ Sun gear Rear planetary gearset driven components:
^ None Front planetary gearset held components:
^ None Center planetary gearset held components:
^ Ring gear Rear planetary gearset held components:
^ Planetary carrier

Power Flow