Major topics include: 

  1. Diesel Engine Theory and Operation

  2. Air Induction Systems

    1. Turbochargers

    2. Crankcase ventilation systems

  3. Exhaust Systems

    1. Diesel emissions

    2. Exhaust gas recirculation systems (EGR)

    3. Diesel oxidation catalysts (DOC)

    4. Diesel particulate filters (DPF)

    5. Urea Selective Catalytic Reduction (HPCR)

  4. Fuel Systems

    1. Hydraulically actuated electronic unit injectors (HEUI)

    2. High pressure common rail (HPCR)

 

During the course, the technician will be provided with information to assist in preparation for the following exam administered by the National Institute for Automotive Excellence (ASE):

A9 - Light Vehicle Diesel Engines

ASE A9 Test Prep

This one-day course was created to help prepare the student for the ASE A-9 Light Vehicle Diesel Engines test. The primary focus is explaining the operation and diagnosis of modern light vehicle diesel engine systems.

Close-up of a car engine with the valve cover removed, exposing the camshaft, valves, and various engine components and wiring.

Photos and Feedback

Arizona Fire Mechanics - January 2026

  • Early morning arrival at the 'Golder Ranch Fire District' outside of Tucson Arizona, for a day of ASE A9 training.

  • A classroom filled with EVT mechanics seated at tables, using laptops and smartphones. On the screen a QR code for a quiz.

    “Thank you! The students I have contact with are still talking about the class. Job well done!”

    Phillip Cantua, Lead Fleet Maintenance Technician, Golder Ranch Fire District

  • A classroom of Emergency Vehicle Technicians seated at desks, facing a large screen displaying a QR code and the text 'Please fill out the ASE A9 Pretest'.

    “I enjoyed your class Friday. Good stuff!”

    Sergio Morales, Arizona EVT

  • Fire station building with a sign reading "Golder Ranch Fire District Catalina Station 3835," surrounded by desert plants and parking lot, with a large radio tower and trees nearby.

  • The assistant fire chief welcomes a room full of Emergency Vehicle Technicians to a full day of ASE A9 training by Tony Martin.

  • A conference room filled with technicians attending a presentation on ASE A9 Test Prep. Tony Martin stands at the front near a screen displaying the presentation title.

Frequently Asked Questions

  • Tony Martin taught hydraulics in the public education and private sectors for thirteen years. He holds 22 ASE certifications, including the EVTCC F8-hydraulics.

  • NO. This class can accommodate as many students as necessary.

  • At the venue of your choosing. We bring the classroom to you!

  • NO. This class is designed to help students understand the theory of operation and diagnosis of light vehicle diesel engine systems. If the student has a good grasp of these concepts, the test will be straightforward.

  • The ASE A9 Test Prep class is one-day (8 hours) in length.

  • YES. The content of this class will help the students prepare for these additional tests:

    • T2 - Diesel Engines

    • H2 - Diesel Engines

    • S2 - Diesel Engines

    • MIL2 - Diesel Engines