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Hybrid diagnostic modeling is an extension of diagnostic dependency modeling. In hybrid diagnostic model, the relationship of the failure mode each affected function can be sometimes affects, and function definition is comprised of reliability data. To compute Fault Detection Rate (FDR) and Fault Isolation Rate (FIR) when failure modes sometimes affect functions and there are conflicts between failure modes reliability data and functions reliability data, this paper first studies hybrid diagnostic modeling, hybrid diagnostic inferences and the correlation of failure rates for functions and failure modes, then divides failure modes that sometimes affect functions and extends the definition of fault-test dependency matrix, sums up the computing formulas of failure probability calculation method, proposes the algorithm of FDR/FIR computation with failure mode apportionment, failure mode precedence and functional precedence. The results of the example are same to eXpress running results, so the algorithm of FDR/FIR computation is demonstrated to be correct. The study is helpful to understand the principle of eXpress.