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Power switches are used as a part of the power-gating technique to reduce the leakage power of a design. To the best of our knowledge, this is the first report in open literature to show a systematic diagnosis method for accurately diagnosing power switches. The proposed diagnosis method utilizes the recently proposed design-for-test solution for efficient testing of power switches in the presence of process, voltage, and temperature variation. It divides power switches into segments such that any faulty power switch is detectable, thereby achieving high diagnosis accuracy. The proposed diagnosis method is validated through SPICE simulation using a number of ISCAS benchmarks synthesized with a 90-nm gate library. Simulation results show that, when considering the influence of process variation, the worst case loss of accuracy is less than 4.5%; it is less than 12% when considering VT variations.