System Operation

Automatic Transaxle-Transmission External Controls - Select Shift

System Operation

System Diagram

6F50/6F55










Range Selection

This transaxle has 5 range positions: P, R, N, D and M for vehicle equipped with SelectShift(TM) .

Selector Lever - 6F50/6F55





Park

In the park position:

- there is no power flow through the transaxle.

- the parking pawl locks the final drive.

- the engine may be started.

- the ignition key may be removed.

Reverse

In the REVERSE position:

- the vehicle may be operated in a rearward direction, at a reduced gear ratio.

- engine braking will occur.

Neutral

In the NEUTRAL position:

- there is no power flow through the transaxle.

- the output shaft is not held and is free to turn.

- the engine may be started.

Drive Position With Grade Assist

DRIVE is the normal position for most forward driving.

Drive provides:

- automatic shifts - 1st through 6th gears.

- apply and release of the TCC (Torque Converter Clutch).

- maximum fuel economy during normal operation

Manual M Position (vehicles equipped with SelectShift (TM))

In manual M position:

- the transaxle provides maximum engine braking.

- gears 1 through 6 are available.

- 1st through 5th gears are available upon deceleration.

- the driver can manually shift the transaxle to gears 1 through 6 using the SelectShift(TM) switch located on the selector lever knob.

- upshifts will have to be shifted manually using the SelectShift(TM) switch on the selector lever.

- grade assist is activated.

- the transaxle will select gears that will provide the engine braking desired, based on the vehicle inputs, this will increase engine rpm during engine braking.

- the transmission will make all downshifts.

Gear Availability





Brake Shift Interlock

Brake Shift Interlock Operation

When the ignition switch is in RUN/START, the solenoid inhibits the selector lever movement (from the PARK position) if the brake pedal is not pressed.

The BSIA (Brake Shift Interlock Actuator) inhibits the selector lever movement from the PARK position by mechanically blocking the detent pawl of the selector lever mechanism. When the brake pedal is applied with the ignition key in the RUN/START position and the transmission in PARK, the BSIA (Brake Shift Interlock Actuator) is energized by the BCM (Body Control Module), this allows the selector lever to be moved out of the PARK position.






Proper Operation Requirements

Three requirements for the selector lever to be moved from the PARK position are:

- Ignition switch in the RUN/START position

- TR (Transmission Range) sensor in the PARK position

- BPP (Brake Pedal Position) switch closed (brakes applied - brake lamps on)

SelectShift





When the selector lever is moved to the M position, the driver can shift the transaxle manually using the SelectShift(TM) switch mounted on the selector lever knob. By pressing plus (+) on the toggle switch once will shift the transmission to next highest gear. Pressing the minus (-) on the toggle switch will shift the transmission to next lowest gear.

The SelectShift(TM) switch is not serviceable. If a new switch is required, install a new selector lever knob.