Hydraulic Operation

POWER TRANSMISSION/HYDRAULIC MECHANISM DESCRIPTION
P AND N POSITION
MECHANICAL OPERATION
CLUTCH APPLICATION
- None

PLANETARY GEARSET OPERATION
- Driving member:
- None

TORQUE PATH
- Driven member:
- None
- Held member:
- Driven sprocket component held in then P position (held by the parking lock mechanism)
- None held in N position
- Member also rotating:
- None

HYDRAULIC OPERATION
CIRCUIT OPERATION
- Line pressure:
- LP circuit pressure regulated by the main regulator valve, based on TV circuit pressure from the EPC solenoid
- Torque converter/lube:
- LPX circuit from the main regulator valve to the converter regulator valve and CCX circuit
- CCX circuit to the bypass valve, front lube and differential lube passages
- CI circuit from the CCX circuit to the torque converter impeller
- CT circuit from the torque converter turbine and bypass valve to the fluid cooler and rear lube passages
- TC circuit from the bypass valve to the fluid cooler and rear lube passages
- CBY circuit from the bypass valve to the release side of the torque converter clutch plate
- Solenoid/lube:
- SF circuit from the solenoid regulator valve to final drive lube passages, SS1, SS2, 3-2 T/CCS and TCC solenoid
- Applying components:
- LP circuit blocked at manual valve

ELECTRICAL OPERATION
SOLENOID OPERATION:
- EPC: Lower current control that results in higher line pressure
- SS1: OFF status affecting the positions of the 1-2 and 3-4 shift valves
- SS2: ON status affecting the position of the 2-3 shift valve
- 3-2 T/CCS: High current control that results in no possible coast clutch application
- TCC: Zero pulse-width control that results in the release of the torque converter clutch

R POSITION

MECHANICAL OPERATION
CLUTCH APPLICATION:
- Reverse clutch allows the turbine shaft to rotate the REV/4GR sun gear
- Low/reverse clutch allows the case to hold the REV/4GR carrier and LOW-INT ring gear Stationary during both driving and coasting operations

PLANETARY GEARSET OPERATION:
To produce power flow in the R position, the planetary gearsets operate as follows:
- The REV/4GR sun gear is the driving member and reverse clutch is applied.
- The REV/4GR ring gear and LOW-INT carrier are the driven members and connected to the chain drive.
- The REV/4GR carrier and LOW-INT ring gear are stationary direct clutch is released, low/reverse clutch is applied, and low one-way clutch is ineffective.
- The LOW-INT sun gear also rotates without transmitting torque and forward clutch is released, forward one-way clutch is ineffective, and coasting clutch is released.
Engine braking occurs in the R position during coasting operation.

TORQUE PATH:
- Driving member:
- REV/4GR sun gear
- Driven member:
- REV/4GR ring gear
- Held member:
- REV/4GR carrier

HYDRAULIC OPERATION
CIRCUIT OPERATION:
- Line pressure:
- LP circuit pressure is regulated by the main regulator valve. Based on TV circuit pressure from the EPC solenoid
- Torque converter/lube:
- LPX circuit from the main regulator valve to the converter regulator valve and CCX circuit
- CCX circuit to the bypass valve. Front lube and differential lube passages
- CI circuit from the CCX circuit to the torque converter impeller
- CT circuit from the torque converter turbine and bypass valve to the fluid cooler and rear lube passages
- TC circuit from the bypass valve to the fluid cooler and rear lube passages
- CBY circuit from the bypass valve to the release side of the torque converter clutch plate due to R circuit pressure at the bypass valve
- Solenoid/lube:
- SF circuit from the solenoid regulator valve to final drive lube passages, SS1, SS2, 3-2 T/CCS and TCC solenoid
- Apply components:
- Reverse clutch and low/reverse clutch:
- R circuit from the manual valve to the bypass valve and the 1-2 shift valve
- R circuit from the 1-2 shift valve to the RC and LRC circuits
- RC circuit to the reverse clutch
- LRC circuit to the manual valve, low/reverse accumulator and low/reverse valve
- LRC circuit from the low/reverse valve to the low/reverse clutch

ELECTRICAL OPERATION
SOLENOID OPERATION:
- EPC: Varying current control that results in line pressure matching the powertrain torque requirements
- SSI: OFF status affecting the positions of the 1-2 and 3-4 shift valves
- SS2: ON status affecting the position of the 2-3 shift valve
- 3-2 T/CCS: High current control that results in no possible coasting clutch application
- TCC: Zero pulse-width control that results in the release of the torque converter clutch

D RANGE/FIRST GEAR
MECHANICAL OPERATION

CLUTCH APPLICATION:
- Forward clutch allows the turbine shaft to rotate the outer race of the forward one-way clutch
- Forward one-way clutch allows the forward clutch to rotate the LOW-INT sun gear during drive operation only
- Low one-way clutch allows the case to hold the REV/4GR carrier and LOW-INT ring gear stationary during drive operation only

PLANETARY GEARSET OPERATION.
To produce power flow in the first gear, the planetary gearsets operate as follows:
- The LOW-INT sun gear is the driving member that forward clutch is applied and forward one-way clutch- is holding during drive operation only.
- The LOW-INT carrier and REV/4GR ring gear are the driven members and connected to the chain drive.
- The LOW-INT ring gear and REV/4GR carrier are stationary and low one-way clutch is holding during drive operation only.
- The REV/4GR sun gear also rotates without transmitting torque (2/4 band and reverse clutch released).

TORQUE PATH:
- Driving member:
- LOW-INT sun gear
- Driven member:
- LOW-INT carrier
- Held member:
- LOW-INT ring gear

HYDRAULIC OPERATION
CIRCUIT OPERATION:
- Line pressure:
- LP circuit pressure is regulated by the main regulator valve, based on TV circuit pressure from the EPC solenoid and opposed by the D21 circuit
- Torque converter/lube:
- LPX circuit from the main regulator valve to the converter regulator valve and CCX circuit
- CCX circuit to the bypass valve, front lube and differential lube passages
- CI circuit from the CCX circuit to the torque converter impeller
- CT circuit from the torque converter turbine and bypass valve to the fluid cooler and rear lube passages
- TC circuit from the bypass valve to the fluid cooler and rear lube passages
- CBY circuit from the bypass valve to the release side of the torque converter clutch plate
- Solenoid/lube:
- SF circuit from the solenoid regulator valve to the final drive lube passages, SS1, SS2, 3-2 T/CCS and TCC solenoid
- Apply components:
- Forward clutch:
- FC circuit from the manual valve to the forward accumulator and the forward clutch

ELECTRICAL OPERATION
SOLENOID OPERATION:
- EPC: Varying current control that results in line pressure matching the powertrain torque requirements..
- SS1: ON status affecting the position of the 1-2 shift valve
- SS2: ON status affecting the position of the 2-3 shift valve
- 3-2 T/CCS: High current control that results in no possible coasting clutch application
- TCC: Zero pulse-width control that results in the release of the torque converter clutch

D AND 2 RANGE/SECOND GEAR

MECHANICAL OPERATION
CLUTCH APPLICATION:
- Forward clutch allows the turbine shaft to rotate the outer race of the forward one-way clutch.
- Forward one-way clutch allows the forward clutch to rotate the LOW-INT sun gear during drive operation only.
- 2/4 band allows the case to hold the REV/4GR sun gear stationary.
- Coasting clutch allows the LOW-INT sun gear to rotate the turbine shaft during coasting operation. The coasting* clutch is applied at all times in S range. The coasting clutch is applied in D range.

PLANETARY GEARSET OPERATION:
To produce power flow in the second gear, the planetary gearsets operate as follows:
- The LOW-INT sun gear is the driving member that forward clutch applied and forward one-way clutch held during drive operation only. Note that when the coasting clutch is applied, the LOW-INT sun gear is connected to the turbine shaft during both drive and coasting operation to provide engine braking (D, 2 and 1 range).
- The LOW-INT carrier and REV/4GR ring gear are the driven members that are connected to the chain drive.
- The LOW-INT ring gear and REV/4GR carrier rotates transmitting torque that are low one-way clutch overrunning.
- The REV/4GR sun gear is stationary and 2/4 band is applied.

TORQUE PATH:
- Driving member:
- LOW-INT sun gear
- Driven members:
- LOW-INT carrier and REV/4GR ring gear
- Held member:
- REV/4GR sun gear

HYDRAULIC OPERATION
CIRCUIT OPERATION:
- Line pressure:
- LP circuit pressure regulated by the main regulator valve, based on TV circuit pressure from the EPC solenoid and opposed by the D21 circuit
- Torque converter/lube:
- LPX, CCX CI, CT and TC circuits operating the same as in D range/first gear
- Modulated pressure in the CBY circuit from the bypass valve to the torque converter clutch plate, based on S4 circuit pressure
- Solenoid/lube:
- SF circuit from the solenoid regulator valve to the final drive lube passages, SS1, SS2, 3-2 T/CCS and TCC
- Apply components:
- Forward clutch:
- FC circuit from the manual valve to the forward accumulator and the forward clutch
- 2/4 servo apply after 1-2 shift:
- D21 circuit from the manual valve to the 1-2 shift valve
- L234 circuit from the 1-2 shift valve to 234PO circuit and 3-2 control valve
- 234V circuit from the 3-2 control valve to the ACC circuit and 2/4 accumulator, as well as to the 2-3 and 3-4 shift valves
- LMX circuit from the 2-3 shift valve to the 3-4 shift valve
- SA circuit from the 3-4 shift valve to the apply side of the 2/4 servo
- Coasting clutch:
- D21, L123 and CCL circuits operating the same as in 1 range/second gear

ELECTRICAL OPERATION
SOLENOID OPERATION:
- EPC: Varying current control that results in line pressure matching the powertrain torque requirements
- SS1: OFF status affecting the positions of the 1-2 and 3-4 shift valves
- SS2: ON status affecting the position of the 2-3 shift valve
- 3-2 T/CCS: Zero current control that results in coast clutch application
- TCC: High pulse-width control that results in a modulated apply of the torque converter clutch (PCM controlled)

D AND 2 RANGE/THIRD GEAR

MECHANICAL OPERATION
CLUTCH APPLICATION:
- Forward clutch allows the turbine shaft to rotate the outer race of the forward one-way clutch
- Forward one-way clutch allows the forward clutch to rotate the LOW-INT sun gear during drive operation only
- Direct clutch allows the turbine shaft to rotate the: LOW-INT ring gear and REV/4GR carrier
- Coasting clutch allows the LOW-INT sun gear to. rotate the turbine shaft during coasting operation. The coasting clutch is applied at all times in 2 range. The coasting clutch may be applied in D range.

PLANETARY GEARSET OPERATION:
To produce power flow in third gear (1:1 ratio between the turbine shaft and REV/4GR ring gear), the planetary gearsets operate as follows:
- The LOW-INT sun gear is a driving member that forward clutch are applied and forward one-way clutch is holding during drive operation only. Note that when the coasting clutch is applied, the LOW-INT sun gear is connected to the turbine shaft during both drive and coasting operation to provide engine braking (D, 2 and 1 range).
- The LOW-INT ring gear and REV/4GR carrier are the driving members that direct clutch is applied, and low one-way clutch is overrunning.
- The LOW-INT carrier and REV/4GR ring gear are the driven members that are connected to the chain drive
- The REV/4GR sun gear is rotating without transmitting torque and 2/4 band at OFF, and reverse clutch is released.

TORQUE PATH:
- Driving members:
- LOW-INT sun gear
- LOW-INT ring gear and REV/4GR carrier
- Driven members:
- LOW-INT carrier and REV/4GR ring gear
- Held member:
- None

HYDRAULIC OPERATION
CIRCUIT OPERATION:
- Line pressure:
- LP circuit pressure regulated by the main regulator valve, based on TV circuit pressure from the EPC solenoid and opposed by the D21 circuit
- Torque converter/lube:
- LPX, CCX, CI, CT and TC circuits operating the same as in D range/first gear
- Modulated pressure in the CBY circuit from the bypass valve to the torque converter clutch plate, based on S4 circuit pressure
- Solenoid/lube:
- SF circuit from the solenoid regulator valve to the final drive lube passages, SSI, SS2, 3-2 T/CC9 and TCC solenoid
- Apply components:
- Forward clutch:
- FC circuit from the manual valve to the forward accumulator and the forward clutch
- Direct clutch:
- D21 circuit from the manual valve to the 2-3 shift valve
- L34 circuit from the 2-3 shift valve to the 1-2 shift valve, servo release valve, DC circuit and 3-2 timing valve
- DC circuit to the direct clutch, through the 3-2 timing valve to the 34V circuit
- 2/4 servo release:
- DCX circuit from the servo release valve to the 3-4 shift valve to the SR circuit
- SR circuit from the 3-4 shift valve to the release side of the 2/4 servo
- Coasting clutch:
- D21, L123 and CCL circuits operating the same as in 1 range

ELECTRICAL OPERATION
SOLENOID OPERATION:
- EPC: Varying current control that results in line pressure matching the powertrain torque requirements
- SS1: OFF status affecting the positions of the 1-2 and 3-4 shift valves
- SS2: OFF status affecting the position of the 2-3 shift valve
- 3-2 T/CCS: Zero current control that results in coasting clutch application
- TCC: High pulse-width control that results in a modulated application of the torque converter clutch

D RANGE/FOURTH GEAR

MECHANICAL OPERATION
CLUTCH APPLICATION:
- Direct clutch allows the turbine shaft to rotate the LOW-INT ring gear and REV/4GR carrier
- 2/4 band allows the case to hold the REV/4GR sun gear stationary
Note that even the forward clutch is applied, it is ineffective when the forward one-way clutch overruns.

PLANETARY GEARSET OPERATION:
To produce power flow in fourth gear, the planetary gearsets operate as follows:
- The LOW-INT ring gear and REV/4GR carrier are the driving member that direct clutch is applied and low one-way clutch is overrunning.
- The REV/4GR ring gear and LOW-INT carrier are the driven member that is connected to the chain drive.
- The REV/4GR sun gear is stationary with 2/4 band applied, and reverse clutch released.
- The LOW-INT sun gear also rotates without transmitting torque with forward clutch applied, and forward one-way clutch overrunning.
Engine braking occurs in fourth gear during coasting operation.

TORQUE PATH:
- Driving member:
- REV/4GR carrier
- Driven member:
- REV/4GR ring gear
- Held member:
- REV/4GR sun gear

HYDRAULIC OPERATION
CIRCUIT OPERATION:
- Line pressure:
- LP circuit pressure is regulated by the main regulator valve, based on TV circuit pressure from the EPC solenoid and opposed by the D21 circuit
- Torque converter/lube:
- LPX, CCX, CI, CT and TC circuits operate the same as in D range/first gear
- Modulated pressure is in the CBY circuit from the bypass valve to the torque converter clutch plate, based on S4 circuit pressure
- Solenoid/lube:
- SF circuit from the solenoid regulator valve to final drive lube passages, SS1, SS2, 3-2 T/CCS and TCC solenoid
- Apply components:
- Direct clutch:
- Circuit operation is the same as in D and 2 range/third gear
- 2/4 servo apply:
- R circuit to exhaust through 3-4 shift valve
- D21 circuit from the manual valve to the 1-2 shift valve
- L234 circuit from the 1-2 shift valve to 234PO circuit and 3-2 control valve
- 234V circuit from the 3-2 control valve to the ACC circuit and 2/4 accumulator, as well as to the 3-4 shift valve
- A circuit from the 3-4 shift valve to the apply side of the 2/4 servo
- Forward clutch:
- FC circuit from the manual valve to the forward accumulator and the forward clutch

ELECTRICAL OPERATION
SOLENOID OPERATION:
- EPC: Varying current control that results in line pressure matching the powertrain torque requirements
- SS1: ON status affecting the position of the 3-4 shift valve
- SS2: OFF status affecting the position of the 2-3 shift valve
- 3-2 T/CCS: High current control that results in no possible coasting clutch application
- TCC: High pulse-width control that results in a modulated apply of the torque converter clutch

1 RANGE/FIRST GEAR

HYDRAULIC OPERATION
CIRCUIT OPERATION:
- Line pressure:
- LP circuit pressure regulated by the main regulator valve, based on TV circuit pressure from the EPC solenoid and opposed by the D21 circuit
- Torque converter/lube:
- LPX, CCX, CI, CT and TC circuits operating the same as in D and 2 range/first gear
- CBY circuit from the bypass valve to the release side of the torque converter clutch plate due to L1 circuit pressure at the bypass valve
- Solenoid/lube:
- SF circuit from the solenoid regulator valve to final drive lube passages, SS1. SS2, 3-2 T/CCS and TCC solenoid
- Applying components:
- Forward clutch:
- FC circuit from the manual valve to the forward accumulator and the forward clutch
- Coasting clutch:
- D21 circuit from the manual valve to the 3-4 shift valve
- LI 23 circuit from the 3-4 shift valve to the coasting clutch valve
- CCL circuit from the coast clutch valve to the coasting clutch
- Low/reverse clutch:
- L circuit from the manual valve to the 1-2 shift valve
- LX circuit from 1-2 shift valve to the low/reverse valve
- LRC circuit from the low/reverse valve to the low/reverse clutch

ELECTRICAL OPERATION
SOLENOID OPERATION:
- EPC: Varying current control that results in line pressure matching the powertrain torque requirements
- SS1: ON status affecting the position of the 1-2 shift valve
- SS2: ON status affecting the position of the 2-3 shift valve
- 3-2 T/CCS: Zero current control that results in coasting clutch application
- TCC: Zero pulse-width control that results in the release of the torque converter clutch

1 RANGE/SECOND GEAR

MECHANICAL OPERATION
CLUTCH APPLICATION:
- Forward clutch, allowing the turbine shaft to rotate the outer race of the forward one-way clutch
- Forward one-way clutch, allowing the forward clutch to rotate the LOW-INT sun gear during drive operation
- Coasting clutch allows the LOW-INT sun gear to rotate the turbine shaft during coasting operation
- 2/4 band allows the case to hold the REV/4GR sun gear stationary

PLANETARY GEARSET OPERATION:
To produce power flow in the second gear, the planetary gearsets operate the same as D and 2 range with the coasting clutch applied.

TORQUE PATH:
- Driving member:
- LOW-INT sun gear
- Driven members:
- LOW-INT carrier and REV/4GR ring gear
- Held member:
- REV/4GR sun gear

HYDRAULIC OPERATION
CIRCUIT OPERATION:
- Line pressure:
- LP circuit pressure regulated by the main regulator valve, based on TV circuit pressure from the EPC solenoid and opposed by the D21 circuit
- Torque converter/lube:
- LPX, CCX, CI, CT and TC circuits operating the same as in D range first gear
- CBY circuit from the bypass valve to the release side of the torque converter clutch plate
- Solenoid/lube:
- SF circuit from the solenoid regulator valve to final drive lube passages, SS1, SS2, 3-2 T/CCS and TCC solenoid
- Applying components:
- Forward clutch:
- FC circuit from the manual valve to the forward accumulator and the forward clutch
- Coasting clutch:
- D21 circuit from the manual valve to the 3-4 shift valve
- L123 circuit from the 3-4 shift valve to the coasting clutch valve
- CCL circuit from the coasting clutch valve to the coasting clutch
- 2/4 servo apply:
- Circuits operates the same as with the D and 2 range/second gear

ELECTRICAL OPERATION
SOLENOID OPERATION:
- EPC: Varying current control that results in line pressure matching the powertrain torque requirements
- SSI: OFF status affecting the positions of the 1-2 and 3-4 shift valves
- SS2: ON status affecting the position of the 2-3 shift valve
- 3-2 T/CCS: Zero current control that results in coasting clutch application
- TCC: Zero pulse-width control that results in the release of the torque converter clutch (PCM controlled)