100+ Free ASE T2 Diesel Engines (Medium/Heavy Truck) Practice Questions
Pass your ASE T2 — Diesel Engines (Medium/Heavy Truck) Certification exam on the first try — instant access, no signup required.
On a variable-geometry turbocharger (VGT), sticking vanes due to soot/carbon will MOST likely cause:
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Key Facts: ASE T2 Diesel Engines (Medium/Heavy Truck) Exam
55
Scored Multiple-Choice Questions
ASE Medium/Heavy Truck test series
65
Total Questions Incl. Unscored
ASE test structure
90 min
Testing Time
ASE T2 test information
~$59
ASE Registration Fee
ASE registration information
2 years
Work Experience Required
ASE certification requirements
5 years
Certification Validity
ASE recertification information
ASE lists Diesel Engines (T2) as a 90-minute Medium/Heavy Truck test with 55 scored multiple-choice questions plus unscored items (65 total). Scoring is criterion-referenced and set by ASE rather than a fixed published percentage, and certification requires two years of relevant work experience (training can substitute for up to one year). Fuel System is the largest content area, followed by General Engine Diagnosis; this free practice bank provides 100 selected-response items aligned to all eight official content areas.
Sample ASE T2 Diesel Engines (Medium/Heavy Truck) Practice Questions
Try these sample questions to test your ASE T2 Diesel Engines (Medium/Heavy Truck) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1A medium-duty diesel engine has low power but no diagnostic trouble codes. Which check should the technician perform FIRST?
2Technician A says blue exhaust smoke usually indicates oil consumption. Technician B says black exhaust smoke usually indicates incomplete combustion or excess fuel. Who is correct?
3White smoke from a diesel exhaust during a cold start that clears as the engine warms is MOST likely caused by:
4During a cylinder cutout (kill) test on an electronically controlled diesel, the engine RPM does NOT drop when one cylinder is disabled. This indicates that cylinder is:
5A diesel engine is hard to start when cold but starts normally when warm. Glow systems are not used on this engine. Which is the MOST likely cause?
6When performing a cylinder compression test on a medium/heavy diesel, the engine should be:
7An engine has excessive crankcase blowby. This condition is MOST directly an indicator of:
8A diesel engine surges at idle. Technician A says air in the fuel system can cause idle surge. Technician B says a sticking fuel control actuator or faulty rail pressure control can cause idle surge. Who is correct?
9The BEST tool for locating an internal coolant-to-oil leak before disassembly is:
10An engine knocks under load. Which is the LEAST likely mechanical cause and should be verified electronically first?
About the ASE T2 Diesel Engines (Medium/Heavy Truck) Exam
ASE T2 — Diesel Engines is the diesel-engine certification test in the ASE Medium/Heavy Truck (T) series for professional truck technicians. The official test contains 55 scored multiple-choice questions (65 total including unscored items) delivered in 90 minutes at Prometric test centers, covering general engine diagnosis, cylinder head and block repair, lubrication and cooling, air induction and exhaust/aftertreatment, fuel systems, starting and charging, and engine brakes.
Assessment
55 scored multiple-choice (65 total incl. 10 unscored) (official ASE); this practice bank is 100 selected-response items
Time Limit
90 minutes
Passing Score
Criterion-referenced (set by ASE)
Exam Fee
~$59 (ASE registration) (ASE (National Institute for Automotive Service Excellence))
ASE T2 Diesel Engines (Medium/Heavy Truck) Exam Content Outline
General Engine Diagnosis
Low-power, hard-start, no-start, excessive-smoke, knock, and oil/coolant contamination diagnosis using compression tests, cylinder-cutout, blowby measurement, and used-oil analysis.
Cylinder Head & Valve Train Diagnosis & Repair
Cylinder head warpage and crack detection, valve guides and seats, valve lash adjustment, rocker arms, and head resurfacing with correct gasket selection.
Engine Block Diagnosis & Repair
Block deck flatness, cylinder bore and liner wear, wet-liner protrusion, crankshaft end play, bearing clearance measurement, and reciprocating-assembly inspection.
Lubrication & Cooling Systems Diagnosis & Repair
Oil pressure diagnosis, oil cooler, oil analysis, thermostats, water pump, fan clutch, coolant chemistry/SCA, and wet-liner cavitation prevention.
Air Induction & Exhaust Systems Diagnosis & Repair
Intake restriction, turbocharger and VGT, charge air cooler, EGR valve/cooler, and aftertreatment including DOC, DPF regeneration, and SCR/DEF diagnosis.
Fuel System Diagnosis & Repair
Common-rail, HEUI, and unit-injector systems, transfer and high-pressure pumps, rail pressure control, injector return and contribution testing, calibration codes, and fuel contamination.
Starting & Charging System Diagnosis & Repair
Battery testing, starter and cranking circuit, voltage-drop testing of cables and grounds, alternator output, and AC ripple/diode diagnosis.
Engine Brakes
Compression-release and exhaust engine brake operation, ECM enable conditions, hydraulic actuation through the oil system, and slave-piston lash adjustment.
How to Pass the ASE T2 Diesel Engines (Medium/Heavy Truck) Exam
What You Need to Know
- Passing score: Criterion-referenced (set by ASE)
- Assessment: 55 scored multiple-choice (65 total incl. 10 unscored) (official ASE); this practice bank is 100 selected-response items
- Time limit: 90 minutes
- Exam fee: ~$59 (ASE registration)
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
ASE T2 Diesel Engines (Medium/Heavy Truck) Study Tips from Top Performers
Frequently Asked Questions
How many questions are on the ASE T2 Diesel Engines test?
The official ASE T2 test has 55 scored multiple-choice questions, with about 10 additional unscored research questions for a total near 65. This free practice bank provides 100 selected-response questions aligned to the same eight ASE T2 content areas so you can practice well beyond the official length.
How much time do I get on ASE T2?
ASE allots 90 minutes for the T2 Diesel Engines test. Because the scored portion is 55 questions, pacing is manageable, but the diagnostic and Technician A/Technician B items reward careful reading rather than rushing.
What passing score do I need on ASE T2?
ASE uses a criterion-referenced passing standard set by ASE rather than a single fixed published percentage. The cut score is determined through ASE's standard-setting process, so focus on mastering each content area instead of targeting a specific number.
What are the eligibility requirements for ASE T2 certification?
ASE certification requires two years of relevant hands-on work experience. Relevant formal training can substitute for up to one year of that requirement. You can take the test before completing the experience, but the certification is awarded once work experience is verified.
Which content area is most heavily weighted on ASE T2?
Fuel System Diagnosis and Repair is the largest area at 29 of the modeled questions, followed by General Engine Diagnosis at 20. Air Induction and Exhaust and Lubrication and Cooling are next at 11 each, so prioritize fuel systems and diagnosis while still covering all eight areas.
Where is the ASE T2 test administered?
ASE T2 is delivered by appointment at Prometric test centers. You register through ASE, schedule a Prometric appointment, and take the computer-based test at the center; ASE certifications are valid for five years before recertification is required.