Shift Patterns

Shift Patterns Upshifts

Transmission upshifiing is controlled by the PCM. The PCM receives inputs from various engine or vehicle sensors and driver demands to control shift scheduling shift feel and Torque Converter Clutch (TCC) operation.

The PCM has an adaptive learn strategy to electronically control the transmission which will automatically adjust the shifi feel. When the battery has been disconnected or a new battery installed certain transmission operating parameters may be lost. The PCM must relearn these parameters. During this learning process you may experience slightly firm shifis delayed or early shifts. This operation is considered normal and will not affect the function of the transmission. Normal operation will return once these parameters are stored by the PCM.

Downshifts

Under certain conditions the transmission will downshift automatically to a lower gear range (without moving the transmission selector lever). There are 3 categories of automatic downshifts: coastdown torque demand and forced (or kickdown) shifts.

Coastdown

The coastdown downshift occurs when the vehicle is coasting down to a stop.

Torque Demand

The torque demand downshift occurs (automatically) during part throttle acceleration when the demand for torque is greater than the engine can provide at that gear ratio. If applied the transmission will disengage the Torque Converter Clutch (TCC) to provide added acceleration.

Kickdown

For maximum acceleration~ the driver can force a downshift by pressing the accelerator pedal to the floor. A forced downshift into a lower gear is possible below calibrated speeds. Specifications for downshift speeds are subject to variations due to tire size and engine and transmission calibration requirements.