Auto Information (AI)
Auto Information is an ASVAB subtest that tests knowledge of automotive systems including engines, transmissions, brakes, electrical systems, and basic vehicle maintenance and repair.
Exam Tip
Auto Information is separate on CAT-ASVAB but combined with Shop Information on paper ASVAB. Know the four-stroke cycle, basic electrical systems, and brake types. NOT part of AFQT.
What is the Auto Information Subtest?
Auto Information (AI) is an ASVAB subtest that measures your knowledge of automobile technology, including how vehicle systems work, common repair procedures, and basic automotive terminology.
Subtest Details
| Feature | CAT without tryouts | Paper enlistment |
|---|---|---|
| Questions | 10 | Combined with Shop (25 total AS) |
| Time | 7 minutes | 11 minutes (combined) |
| Format | Separate subtest | Combined as Auto & Shop (AS) |
Topics Covered
| System | Key Topics |
|---|---|
| Engine | Four-stroke cycle, cylinders, pistons, crankshaft |
| Fuel System | Fuel injection, combustion, octane ratings |
| Cooling System | Radiator, thermostat, coolant, water pump |
| Electrical System | Battery, alternator, starter, ignition |
| Transmission | Manual vs. automatic, gear ratios, clutch |
| Brakes | Disc vs. drum, hydraulic system, ABS |
| Exhaust | Catalytic converter, muffler, emissions |
| Suspension & Steering | Shocks, struts, power steering |
Auto and Shop scoring
The CAT administers Auto and Shop separately, then reports a combined AS score. The paper enlistment form combines the questions in one AS subtest. AS contributes to some occupational composites. AI and SI are outside the four AFQT subtests.
Study Tips
- Learn the four-stroke engine cycle (intake, compression, power, exhaust)
- Understand basic electrical circuits in vehicles
- Know the difference between disc and drum brakes
- Study common dashboard warning indicators
- Practice identifying engine components and their functions
Study This Term In
Third-party resources · We may earn a commission from purchases.
ASVAB Total Prep 2025-2026: Includes 7 Full Length Practice Tests + 2000+ Practice Questions and Flashcards + Online Access to Interactive Video Lessons and Tutorials (Kaplan Test Prep)
By Kaplan Test Prep
$54.99 · 
Take courses on Udemy
Practice exams on ExamEdge
Study guide on MometrixRelated Terms
Armed Services Vocational Aptitude Battery (ASVAB)
The ASVAB is a multiple-aptitude test administered by the U.S. Department of Defense to determine qualification for military enlistment and job placement across all branches. The computer-adaptive enlistment form has 10 subtests in verbal, math, science and technical, and spatial domains.
Shop Information (SI)
Shop Information is an ASVAB subtest that tests knowledge of tools, shop practices, woodworking, metalworking, and building materials. On the CAT-ASVAB it is a separate subtest; on the paper version it is combined with Auto Information as Auto & Shop (AS).
Mechanical Comprehension (MC)
Mechanical Comprehension is an ASVAB subtest that tests understanding of basic mechanical and physical principles, including simple machines, force, energy, fluid dynamics, and structural support concepts.
Your AI study companion · 10 free interactions a day
Stay Updated
Get free exam tips and study guides delivered to your inbox.