This paper describes several experiments designed to characterize jitter in an actual automotive application designed using FlexCAN, a CAN based communication architecture. Large and variable jitter has been a liability of the CAN protocol. The paper also explains how FlexCAN reduces jitter by using a simple message scheduling technique that synchronized with control system to control the system definition and manage its complexity. This paper presents the results of the language extension provided by the EAST-ADL2 domain model and focuses on its possible extension of the AUTOSAR standard to support decomposition of E/E automotive systems.