Comparing to previous diagnosis algorithm,the proposed algorithm has no hypothesis of "t-diagnosable" and "believe the most" while finding the diagnosis result.

This paper presents a new concrete method equation diagnosis algorithm about seeking all consistent fault pattern for ordinary Chwa & Hakimi models without supposing " t-diagnosable" or "believe the most".

This paper first gives the definition of Malek models by using equations model,then presents a new concrete method equation diagnosis algorithm about seeking all consistent fault patterns for Malek models without supposing"t-diagnosable"or"believe the most"by using the tool of"body grouping",it enriches the fault diagnosis methods about Malek models.

Resulted from the imitation, the algorithms have biggish practical meaning, because the complexity of the system-level fault diagnosis has been greatly decreased, especially in strong t-diagnosable system.