Shift Pattern

UPSHIFTS
Transmission upshifting is controlled by the Powertrain Control Module (PCM). The PCM receives inputs from various engine or vehicle sensors and driver demands to control shift scheduling, shift feel and torque converter clutch operation.

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

COASTDOWN
The coastdown downshift occurs as the name indicates; 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. The transmission will disengage the torque converter clutch to provide added acceleration, if applied.

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 (third, second or first) is possible below calibrated speeds. For all shift speeds, specifications are subject to variations due to tire size, engine and transmission calibration requirements.

TRANSMISSION CONTROL SWITCH AND LAMP OPERATION
The transmission control switch is a momentary contact switch. When the switch is pressed, a signal is sent to the powertrain control module to allow automatic shifts from first through fourth gears or first through third gears only. The PCM energizes the Transmission Control Indicator Lamp (TCIL) when the switch is off. The TCIL indicates overdrive cancel mode activated (lamp ON) and EPC circuit shorted (lamp flashing) or monitored sensor failure.