Theory of Operation

The Transmission Control Module controls the gear ratio by the use of a Step motor that transfers electrical power to mechanical movement. The rationality is a continuous test that monitors the Step motor movement. If the Step motor is stuck at a certain position, the estimated ratio is increased or decreased continuously by the feedback value of the primary pulley speed difference. When the difference between the estimated and actual primary pulley speed has reached 1000 rpm, a DTC will set.