  The Cartan scheme $\cal X$ of a finite group $G$ with a $(B,N)$-pair is
defined to be the coherent configuration associated with the action of $G$ on
the right cosets of the Cartan subgroup $B\cap N$ by the right multiplications.
It is proved that if $G$ is a simple group of Lie type, then asymptotically,
the coherent configuration $\cal X$ is 2-separable, i.e., the array of
2-dimensional intersection numbers determines $\cal X$ up to isomorphism. It is
also proved that in this case, the base number of $\cal X$ equals 2. This
enables us to construct a polynomial-time algorithm for recognizing the Cartan
schemes when the rank of $G$ and order of the underlying field are sufficiently
large. One of the key points in the proof of the main results is a new
sufficient condition for an arbitrary homogeneous coherent configuration to be
2-separable.
