All 45 exams / T-series / ASE T1 Gasoline Engines
T1
ASE T1 Gasoline Engines
Medium and heavy trucks
What's on the T1 exam?
1
General Engine Diagnosis
2
Cylinder Head and Valve Train Diagnosis and Repair
3
Engine Block Diagnosis and Repair
4
Lubrication and Cooling Systems Diagnosis and Repair
5
Ignition System Diagnosis and Repair
6
Fuel, Air Induction, and Exhaust Systems Diagnosis and Repair
7
Emissions Control Systems Diagnosis and Repair
8
Computerized Engine Controls Diagnosis and Repair
Content-area outline only, authored from ASE's public task-list structure. No test question, answer, or diagnostic scenario is reproduced from ASE or any prep publisher.
T1 quick reference T-series
Categoryrepair technician
Work experience2
Question count60
Time allowed75 minutes
Fee$62
Recert cycle5 years
Recert pathRetest (approximately half-length recert version) every 5 years, or the ASE Renewal App.
Source: https://ase.com/wp-content/uploads/ASE_MedHeavyTruck_Study_Guide.pdf.
Checked 2026-07-30.
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