California BAR Smog Technician Practice Exam 2026 – Your All-in-One Guide to Smog Certification Success!

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What parameters does the EIS system use to calculate load for an ASM test?

Drive axle weight, vehicle information database, and vehicle look-up tables.

The load for the ASM test is calculated using drive axle weight along with data from a vehicle information database and its look-up tables. The drive axle weight represents the mass the drive wheels must move, which directly determines the engine load the dynamometer must simulate. The vehicle information database stores standard specs for each vehicle, and the look-up tables translate those specs into a calibrated load value the EIS uses to apply the correct resistance. This combination ensures the dynamometer load matches real-world driving conditions for that specific vehicle.

Engine displacement, fuel type, and VIN aren’t the factors that set the ASM load in the EIS—engine displacement and fuel type affect emissions chemistry, and while VIN is used to identify the vehicle so the correct data can be retrieved, the actual load comes from drive axle weight and the data tables. Front axle weight, tire size, and color aren’t used to compute the load, and neither is total vehicle weight, horsepower, or emissions rating.

Engine displacement, fuel type, and VIN.

Front axle weight, tire size, and color.

Total vehicle weight, horsepower, and emissions rating.