Cyber physical systems are specified in a hybrid form, with discrete and continuous parts. Simulating such systems requires precise data and synchronization of continuous changes and discrete transitions. However, in the first design steps, missing information forbids numerical simulation. We present here a new qualitative language for qualitative simulation of cyber physical systems, which consists in computing the relationships between the system variables. This language is implemented in the Diversity symbolic execution engine to build the traces of the system. We apply this approach to the analysis of SysML models, using an M2M transformation from SysML to a pivot language, an M2T transformation from this language to Diversity and an analysis of the traces obtained by Diversity to build the qualitative behaviors of the system.