Air Induction & Turbocharging — ASE A9 Diesel Practice Test
Free ASE A9 Light Vehicle Diesel Engines certification-exam practice in English, Chinese, and Spanish — engine diagnosis, cylinder head and block, lubrication and cooling, air induction and turbocharging, exhaust aftertreatment, fuel delivery, and electronic injection controls, with an explanation for every answer.
22 free practice questions
Practice questions based on the ASE A9 Light Vehicle Diesel Engines task list. This site is not affiliated with or endorsed by the National Institute for Automotive Service Excellence (ASE). Injection pressures, torque specifications, clearances, glow-plug and heater resistance values, regeneration temperatures and service intervals are set by the engine manufacturer, differ by engine family and model year, and are revised by service bulletin — always work to the service information for the vehicle in front of you, never to a practice test. Emissions and aftertreatment hardware varies by model year and market. Diesel fuel systems operate at pressures that can inject fuel through skin; follow the manufacturer's depressurization and safety procedures. Confirm current test content and registration requirements with ASE before you test. About ASE certification →