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Currently, Hardware-In-the-Loop (HIL) testing is the defacto standard for ECU verification and validation at the majority of the Commercial Vehicle OEMs and Tier1 suppliers. HIL Testing is used to shorten development and testing time for both engine and machine control systems. In order to use this process, many of these companies have to develop and maintain expertise in the area of Model-based development (MBD). This paper introduces an approach which allows for the effective use of HIL systems without having to directly work in a MBD environment. Many HIL tests can be done with stimulus and response analysis of the ECUs, given core knowledge of the expected behavior of its control software and I/O subsystems. For hardware interface and diagnostics validation, this open-loop testing of the controller may suffice. It is important to provide the tester with capabilities to easily modify these stimuli and evaluate the responses.