These written domain referenced tests (DRTs) for the area of transportation/automotive mechanics test cognitive abilities or knowledge of theory. Introductory materials describe domain referenced testing and test development. Each multiple choice test includes a domain statement, describing the behavior and content of the domain, and a test item pool. These domains are covered: (1) heating and cooling systems, (2) fuel system, (3) body electrical, (4) braking system, (5) engine system, (6) power train system, (7) starting and charging systems, (8) ignition system, (9) suspension and steering systems, and (10) emissions control system. (DRTs for skills and task detailing booklet are available separately as CE 027 746 and CE 027 745.) (YLB)