Diesel Technician Certificate Click here to request more info

Program Contacts

Professor Ron Luellen (928) 771-6115
Instructional Specialist Stephanie Wiltcher (928) 717-7107
Dean John Morgan (928) 717-7721

Quick Facts

About the Diesel Technician Certificate

The Diesel Technician certificate is designed to prepare students for entry-level positions in heavy diesel mechanics.

Program Outcomes

Upon successful completion of the Diesel Technician Certificate program, the learner will be able to:


  1. Analyze and repair automotive and light truck diesel engines. (AUT108)
  2. Analyze and repair automotive and light truck diesel fuel system components. (AUT108, AUT225)
  3. Analyze and repair automotive and diesel truck electrical system components. (AUT109, AUT 128, AUT225)
  4. Perform basic service maintenance on diesel cars and diesel trucks. (AUT100, AUT126, AUT128, AUT135)
  5. Analyze and repair drive trains. (AUT124)
  6. Analyze diesel truck computer controlled systems. (AUT 109, AUT128, AUT225).

Program-Specific Requirements

Course Course Title Hours
AUT100 Auto/Diesel Preventative Maint

AUT 100. Automotive/Diesel Preventative Maintenance (2). Fundamentals of truck equipment and automobile basic preventative maintenance procedures. One lecture. Two lab.

1. Safety
2. Hand tools
3. Equipment
4. Electrical system
5. Fuels and fuel system
6. Brakes
7. Suspension and Steering
8. Four-stroke Engine
9. Ignition system
10. Tires and wheels

1. Use hand tools and shop equipment, proficiently and safely. (1-3)
2. Explain and identify the use of precision measuring and diagnostic tools. (4)
3. Test the battery, charging and starting system of an engine. (4,8,9)
4. Inspect steering, disc and drum brake systems for wear. (6)
5. Test the automotive and diesel fuel systems for proper operation. (5,9)
6. Remove, repair, and install a tire. (10)
7. Explain the theory of 4-stroke internal combustion engines. (8)

AUT108 Engine Repair Technology

AUT 108. Engine Repair Technology (4). Theory, diagnosis and service common to all diesel engines. Includes engine rebuilding and performance testing along with engine mechanical fuel systems and testing. Preparation for the ASE Certification test on Medium/Heavy Truck Diesel Engines and Light Duty Diesel Engines ASE Automotive Certification. Two Lecture. Four lab.

1. Safety
2. Mechanical condition of diesel engines
3. Engine block components/assembly
4. Cylinder head and valve train components/assembly
5. Dielel fuel systems
6. Mechanical diesel pump systems
7. Engine removal/disassembly and assembly

1. Identify shop environment hazards and employ safety procedures. (1)
2. Determine mechanical condition of engine assembly and its internal components. (2)
3. Interpret engine performance diagnostic test results. (2)
4. Determine the causes of oil leaks and unusual noises on a diesel engine. (2)
5. Determine the causes of unusual odors and exhaust color coming from a running diesel engine. (2)
6. Rebuild short block engine assembly according to manufacturer requirements. (3)
7. Identify worn and/or out-of-specification engine block assembly and components. (3,7)
8. Rebuild cylinder head according to manufacturer requirements. (4)
9. Identify worn and/or out-of-specification cylinder head assembly and components. (4)
10. Identify component operation and service of mechanical fuel systems. (5,6)
11. Remove, disassemble and assemble a diesel engine. (7)

AUT109 Auto/Diesel Elect Systems

AUT 109. Auto/Diesel Electrical Systems (4). Electrical principles and diagnosis of diesel and automotive electrical systems. Includes repair of batteries, charging systems, starting systems, ignition systems and use of electrical testing instruments. Two lecture. Four Lab.

1. Electrical Theory
2. Batteries
3. Charging system
4. Starting system
5. Ignition system
6. Electrical schematic symbols
7. Digital/Volt/Ohmmeter use

1. Define and use the terminology of electricity. (1)
2. Test, clean, and replace batteries. (2)
3. Test and repair charging systems. (3)
4. Test and repair starting systems. (4)
5. Explain the theory of operation of ignition systems. (5)
6. Use and interpret electrical schematics to diagnosis basic circuit faults. (6)
7. Use the Digital/Volt/Ohmmeter to test current and voltage drops. (7)

AUT124 Auto/Diesel Manual Drive

AUT 124. Auto/Diesel Manual Drive Trains (4) (Spring). Theory, diagnosis, and service of clutches, driveline, synchromesh transmissions, final drives and manual shift transmissions. Preparation for the ASE Certification Test on A3 Manual Drive Trains and T3 Truck Drive Trains. Two lecture. Four lab.

1. Safety
2. Manual transmission theory
3. Mechanical clutch
4. RWD vehicle drive axle, shaft and differential assembly
5. Transmission electrical controls
6. Manual transmission inspections
7. Differential axle inspections

1. Identify shop environment and hazards. (1)
2. Utilize material safety data sheets and chemicals in the shop environment. (1)
3. Implement trouble-shooting processes including verifying customer concerns, preliminary inspection, and clutch systems performance tests. (2,3)
4. Perform linkage adjustments and any needed or recommended preventative service on transmission systems/transaxle. (2,5)
5. Remove, inspect and replace clutch system components or flywheel and torque converter components. (3)
6. Inspect electrical switches and solenoids. (5)
7. Perform recommended preventative service on driveline assembly. (4,6,7)
8. Remove, inspect and replace system components within or on drive axles, shaft, and differential assembly. (4,6,7)

AUT126 Auto/Diesel Steer/Suspension

AUT 126. Auto/Diesel Suspension and Steering (4). Principles of suspension system geometry and steering systems operation. Adjustment, correction, repair and replacement components of system components. Two lecture. Four lab.

1. Alignment terminology and inspection
2. Basic parts replacement
3. Methods of adjustment
4. Alignment machines
5. Wheel balancing
6. Tire machines.

1. Use terminology associated with suspension repair. (1)
2. Inspect suspension systems. (1)
3. Replace parts in a suspension system. (2)
4. Perform a four-wheel alignment. (3, 4)
5. Operate alignment machines. (4)
6. Balance wheels and tires. (5)
7. Remove and replace wheels and tires. (6)

AUT128 Auto/Diesel Heat & Air

AUT 128. Auto/Diesel Heating and Air Conditioning (4). Theory of heat transfer forms of matter, refrigeration cycle, and operating principles of automotive air conditioning systems. Fundamentals in testing, repairing, disassembling and assembling components of heating and air conditioning systems. Two Lecture. Four Lab.

1. Cooling systems
2. Heating systems
3. Basic thermodynamics
4. Basic refrigeration system
5. Basic service procedures
6. Compressor service
7. Applied service procedures
8. Specific systems
9. Diagnosis of systems
10. Automatic temperature control

1. Explain function of auto heaters and refrigeration systems. (1-3)
2. Explain how the refrigeration cycle operates. (4)
3. Use manifold gauge test set. (9)
4. Disassemble and reassemble an air compressor. (6)
5. Test and diagnose the major manufacturers' systems. (5,8)
6. Explain how automatic temperature control systems function. (10)
7. Repair temperature control systems. (10)
8. Hook up manifold gauge set, read and interpret the pressure gauges, discharge the system, repair the system, evacuate and recharge the system and performance check it. (7,9)

AUT135 Diesel Braking Systems

AUT 135. Diesel Braking Systems (4) (Fall). Diesel Braking Systems (4). Theory, diagnosis and repair of diesel air, hydraulic and anti-lock brake systems. Emphasis on tires and wheels, and hydraulic and air brake systems. Two lecture. Four lab.

1. Safety
2. Foundation Brake systems
3. Hydraulic brake systems
4. Truck wheels and tires
5. Air brake system
6. Disc/drum brakes
7. Brake power assist systems
8. Anti-lock brake systems (ABS)

1. Identify shop environment and hazards. (1)
2. Determine root cause of foundation brake problems. (2)
3. Determine root cause of hydraulic brake problems (3)
4. Determine root cause of unusual tire problems related to wear patterns, vibration, shimmy, noise and vehicle pull. (4)
5. Perform repair on air brake systems. (5)
6. Perform preventative maintenance on disc and drum brake systems. (6)
7. Determine root cause of power assisted brake problems. (7)
8. Determine root cause of anti-lock brake (ABS) problems. (8)

AUT225 Diesel Engine Performance

AUT 225. Diesel Engine Performance (4). Principles of operation, diagnosis and repair of engine fuel and computer systems. Use of diagnostic oscilloscope and scan tools to repair malfunctioning fuel and computer systems. Prerequisite: AUT 109. Two lecture. Four lab.

1. Safety
2. Scan tests and equipment hard code failures
3. Computerized diesel equipment
4. Oscilloscope and scan tools
5. Computer input and output faults
6. Strategy based diagnostics

1. Identify shop environment and hazards. (1) 2. Utilize emergency procedures and policy. (1) 3. Perform preliminary diagnosis process and interpret scan tool codes and PID data. (2) 4. Test mechanical condition of engine. (2) 5. Utilize service reference material to help isolate operational system fault. (3) 6. Perform preliminary diagnostic process and interpret scan tool data. (3,6)


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