Experience should also include gas, diesel and hybrid vehicles such as cars, sport utility vehicles, pickups and trucks of varied size and configurations, graders, stationary and portable generators, bulldozers, tractor-trailers, tankers, cranes and/or other construction-related heavy equipment. Advanced Diagnostics & Repair: Apply journey-level technical expertise to diagnose and repair complex computer-controlled systems, gasoline and diesel engines, manual/automatic transmissions, emission systems, HVAC, suspension, and steering.