This paper presents a modified method for multiple-faults diagnosis of resistance circuits with weakly nonlinear element. The method consists of two parts: multiple-faults location by solving linear diagnosis equations

and then multiple-faults identification by solving nonlinear equations. Diagnosability of the linear diagnosis equation is improved

and the occurrence of the failure of diagnosis or the presence of equivalent faults under certain circumstance by other methods may be reduced

since the characteristics of the nonlinear elements are taken into consideration while formulating the linear diagnosis equation.