DUTIES AND RESPONSIBILITIES 1. Diagnoses operating difficulties on a variety of vehicles and performs operational checks on engines; its major supporting systems, parts, components, assemblies; including emissions systems, electrical, computer and electronic controlled components. 2. Performs various computerized and electronic diagnostic tests using specialized equipment; interprets trouble codes and other information from electronic scanners and test analyzers; uses reference materials such as service manuals and wiring schematics to determine operational difficulties, drivability problems and evaluates performance efficiency. 3. Conducts visual and auditory vehicle inspections, road calls and road tests before and after maintenance and repairs; annotates vehicle problems on work orders. 4. Provides technical guidance and instructions to mechanics and technicians on more difficult repairs and in the use of specialized computer-aided diagnostic equipment. 5. Performs maintenance and repairs resulting from normal preventive maintenance inspections. 6. Prepares and updates vehicle records, maintains vehicle records; annotates labor time, parts and/or equipment and other pertinent data on work orders. 7. Performs engine tune-ups; removes, replaces, adjusts, cleans parts, components, assemblies and accessories; uses a variety of specialized test equipment to adjust systems and components to prescribed operating tolerances. 8. Troubleshoots malfunctioning vehicles resulting from road calls and identifies improperly functioning part(s) and repairs or replaces. 9. Repairs and replaces major components including transmissions, differentials, brake systems, power assist units, steering and suspension assemblies. 10. Performs other job related duties and responsibilities in support of primary duties. 11. Follows all established safety practices and procedures; complies with all postal, local, state and federal environmental regulations and policies. Knowledge of electrical/ignition systems refers to the terminology characteristics, and operation of such components as alternators, batteries, voltage regulators, starter motors, ignition and lighting systems, indicating devices, electronic computer enhanced components, sensors, and starting aids. Knowledge of automotive fuel systems refers to the terminology, characteristics, and operation of fuel delivery systems, and related assemblies, such as fuel pumps, turbochargers, superchargers, inter- coolers, fuel injectors, and the interface of the fuel system with electronic controls. Knowledge of automotive emission control systems refers to the terminology characteristics, and operation of emission control systems as they relate to overall engine operation and performance specifications and conformance to environmental quality regulations. Knowledge of engine systems refers to the terminology, characteristics, and operation of engine valves, piston assemblies, engine bearings, cylinders, cylinder heads, cylinder blocks, crankshaft assemblies, compression ignition, and cooling system. Knowledge of automotive power train systems refers to the terminology, characteristics, and operation of such components as clutches, universal joints, manual and computer enhanced automatic transmission systems, differentials, and drive axles.