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West Virginia University (WVU) has become an industry leader in heavy-duty emissions testing and is continuously improving and updating their testing goals, procedures, and quality. As emissions testing is conducted at WVU in a real-world, on-road environment, engine parameter values are read through the test vehicle's electronic control unit (ECU) and recorded for use in data reductions. One significant value that is recorded by the WVU emissions measurement system is the ECU engine power output. Theses values are recorded and used to report vehicle's brake specific emissions values over a prescribed open-road test route. Because of the fact that the engine power output values reported by the vehicle's ECU are difficult to accurately measure elsewhere, they are assumed to be accurate and used in the data reduction process. This presented the need for a study to develop a model to validate the ECU power output data. The objective of this work was to develop such a model that accurately produces values for the test vehicle's road load while in use. By developing this model, the quality of the results of the on-road emissions testing performed by WVU could be monitored and confirmed.;By measuring three parameters of a vehicle test, this model was developed and produced accurate results. (Abstract shortened by UMI.).