AUT 254 - Basic Automotive Powertrain

1. Perform proper shop safety procedures.
   1. Apply work area safety skills.
   2. Demonstrate safe personal working habits.
   3. Practice safe tool and equipment usage.
   4. Follow manufacturers repair procedures.
   5. Follow manufacturer and government warnings and regulations.
2. Explain drivetrain fundamentals.
   1. Define the purpose of the automotive drivetrain.
   2. Identify the common drivetrain configurations.
   3. Explain the drivetrain components and their function.
   4. Identify different types of transmissions and transaxles.
   5. Describe the concepts of torque multiplication.
   6. List the methods of obtaining gear reduction, overdrive, reverse, neutral and the forward gears.
3. Summarize manual transmission/transaxle design and operation.
   1. Identify and interpret drive train concerns; determine necessary action.
   2. Research vehicle service information such as fluid type, vehicle service history, service precautions, technical service bulletins, and recalls including vehicles equipped with advanced driver assistance systems (ADAS).Identify common transmission terms and explain transmission construction.
   3. Identify manual drive train and axles components and configurations.
   4. Explain power flow through a manual transmission/transaxle.
   5. Identify terms associated with final drives and differentials for transaxles and explain their operation.
   6. Explain the operation of transmission/transaxle shift linkage.
   7. Explain how transmissions/transaxles are internally lubricated and sealed.
4. Assess manual transmission/transaxle for diagnosis and repair
   1. Diagnose noise concerns through the application of transmission/transaxle powerflow principles; determine needed action.
   2. Diagnose hard shifting and jumping out of gear concerns; determine needed action.
   3. Disassemble, inspect clean, and reassemble internal transmission/transaxle components.
   4. Inspect transmission/transaxle case and case mating surfaces, extension housing, bores, bushings, and vents; determine necessary actions.
   5. Inspect and replace gaskets, seals, and sealants; inspect sealing surfaces.
   6. Measure endplay and/or preload on transmission/transaxle shafts; determine necessary action.
   7. Inspect and re-install synchronizer hub, sleeves, keys (inserts), springs, and blocker rings.
5. Summarize automatic transmission/transaxle design and operation.
   1. Describe basic automatic transmission/transaxle operation.
   2. Describe the basic laws of physics involved with an automatic transmission operation.
   3. Classify automatic transmissions according to the power train configuration.
   4. Identify the major components in a torque converter and explain their purpose.
   5. Describe the design and operation of the hydraulic controls used in modern transmissions.
   6. Identify the major apply components in an automatic transmission.
   7. Identify the components in a basic planetary gear set and describe their operation.
   8. Describe the purpose and operation of common friction and reaction members.
   9. Describe the operational characteristics of a continuously variable transmission (CVT).
   10. Describe the operational characteristics of a hybrid vehicle drive train.
6. Evaluate automatic transmission/transaxles for diagnosis and repair
   1. Research vehicle service information such as fluid type, vehicle service history, service precautions, technical service bulletins, and recalls including vehicles equipped with advanced driver assistance systems (ADAS).
   2. Identify automatic transmission and transaxle components and configurations.
   3. Inspect transmission fluid condition; check fluid level; inspect for leaks on transmission or transaxle equipped with a dipstick.
   4. Inspect transmission fluid condition; check fluid level; inspect for leaks on transmission or transaxle not equipped with a dipstick.
   5. Diagnose transmission/transaxle gear reduction/multiplication concerns using driving, driven, and held member (power flow) principles.
   6. Diagnose pressure concerns in a transmission using hydraulic principles (Pascal’s Law).
   7. Identify and interpret transmission/transaxle concerns, differentiate between engine performance and transmission/transaxle concerns; determine needed action.
   8. Diagnose fluid loss and condition concerns; determine needed action.
   9. Perform stall test; determine needed action.
   10. Perform lock-up converter system tests; determine needed action.
   11. Perform pressure tests on transmissions/transaxles equipped with electronic pressure control; determine needed action.
7. Assess automatic transmission/transaxle for diagnosis and repair.
   1. Inspect for leakage; replace external seals, gaskets, and bushings.
   2. Inspect, test, adjust, repair, and/or replace electrical/electronic components and circuits.
   3. Disassemble, clean, and inspect transmission/transaxle.
   4. Inspect, measure, clean, and replace valve body (includes surfaces, bores, springs, valves, switches, solenoids, sleeves, retainers, brackets, check valves/balls, screens, spacers, and gaskets).
   5. Inspect servo and accumulator bores, pistons, seals, pins, springs, and retainers; determine needed action.
   6. Assemble transmission/transaxle.
   7. Inspect, measure, and reseal oil pump assembly and components.
   8. Measure transmission/transaxle end play and/or preload; determine needed action.
   9. Inspect, measure, and/or replace thrust washers and bearings.
8. Evaluate automatic transmission/transaxle for diagnosis and repair.
   1. Inspect oil delivery circuits, including seal rings, ring grooves, and sealing surface areas, feed pipes, orifices, and check valves/balls.
   2. Inspect bushings; determine needed action.
   3. Inspect and measure planetary gear assembly components; determine needed action.
   4. Inspect case bores, passages, bushings, vents, and mating surfaces; determine needed action.
   5. Diagnose and inspect transaxle drive, link chains, sprockets, gears, bearings, and bushings; determine needed action.
   6. Inspect measure, repair, adjust or replace transaxle final drive components.
   7. Inspect clutch drum, piston, check-balls, springs, retainers, seals, friction plates, pressure plates, and bands; determine needed action.
   8. Measure clutch pack clearance; determine needed action.
   9. Air test operation of clutch and servo assemblies.
   10. Inspect one-way clutches, races, rollers, sprags, springs, cages, retainers; determine needed action.
9. Summarize four-wheel drive/all-wheel drive system operation.
   1. Identify and explain the operation of four-wheel drive systems.
   2. Name the major components of conventional four-wheel-drive systems.
   3. Discuss the purpose and operation of 4WD locking/unlocking mechanisms.
   4. Name the components of a transfer case.
   5. Explain the difference between four-wheel-drive (4WD) and all-wheel-drive (AWD).
   6. Explain the operation of viscous clutches used in all-wheel-drive systems.
10. Evaluate four-wheel drive/all-wheel drive components for diagnosis and repair.
    1. Disassemble, service, and reassemble transfer case and components.
    2. Diagnose, test, adjust, and/or replace electrical/electronic components of four-wheel drive/all-wheel drive systems.
    3. Check for leaks at drive assembly and transfer case seals; check vents; check fluid level; use proper fluid type per manufacturer specification.