Transmission General Description: Shifting

The TCM can determine whether to leave a gear engaged or to change up or down. What it does is determined mainly by the gear that is currently engaged, the speed of the output shaft and the position of the accelerator pedal. The TCM changes gear by applying or releasing a friction element in the transmission. The application is regulated with PWM from the respective solenoid.

The gear can also be changed manually with the selector lever in D position if using the Tap Up/Tap Down switch. The switch is hardwired to the BCM which converts the information into a HSCAN message that is used by the TCM.

The maximum shift speed is at 7000 rpm.