Road Test: Introduction

WARNING: This page is about a different car, the 2003 Saturn Vue and 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The TCM calculates the speed ratio based primarily on Accelerator Pedal Position (APP) angle and transaxle output speed. When the TCM says an increase in the speed ratio should occur, an electrical signal goes to the ratio control motor which in turn moves the ratio control valve. The lever on the variable ratio control valve pulls the valve into a position which allows line "1" fluid to enter the primary feed circuit. The primary feed fluid is routed to the apply piston cavities and the fluid pressure moves the piston side of the pulley towards the stationary half of the pulley. The drive belt reacts to the drive pulley position change by rising between the two sides of the pulley. Ratio changes begin as soon as the drive belt moves higher between the pulley halves.