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Medium-Heavy Truck Certifications Flashcards

7 cards from real ASE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which ASE truck test (T1) covers Gasoline Engines?

    Answer: T1

    Test T1 covers gasoline engines for medium/heavy trucks.

  2. A diesel engine cranks but will not start. Which should be checked first?

    Answer: Fuel supply and filters

    Fuel delivery problems such as plugged filters or air in the lines are common no-start causes.

  3. What does a DPF (diesel particulate filter) do?

    Answer: Trap and burn off soot particles

    The DPF captures particulate soot from exhaust and periodically burns it off during regeneration.

  4. Which fluid is injected into the SCR system to reduce NOx emissions?

    Answer: Diesel exhaust fluid (DEF)

    Diesel exhaust fluid (urea) is dosed into the SCR catalyst to convert NOx into nitrogen and water.

  5. A truck's charging system shows low voltage at idle. What is the most likely cause?

    Answer: Faulty alternator or loose belt

    A failing alternator or slipping drive belt produces insufficient charging voltage.

  6. What is the correct first step when jump-starting a heavy truck with dead batteries?

    Answer: Connect positive to positive first

    Connect the positive cable to both positive terminals first, then ground the negative away from the battery.

  7. Coolant in the engine oil on a diesel most often indicates what failure?

    Answer: Failed head gasket or cracked liner seal

    Coolant mixing with oil typically points to a blown head gasket, cracked head, or failed cylinder liner seal.