Automatic Transmission Level 3ASEP 202W
Prerequisite: ASEP 152. Practices the diagnostic procedures and repair of many automatic transmissions. Practices NATEF tasks to MAST (Master Automotive Service Technology) level related to automatic transmissions. Requires meeting all related GM ASEP training requirements.(45-51)
Outcomes and Objectives
Complete general Automotive Transmission and Transaxle Level 3 NATEF tasks as listed below.
- Identify and interpret transmission/transaxle concern, differentiate between engine performance and transmission/transaxle concerns; determine necessary action.
- Research applicable vehicle and service information fluid type, vehicle service history, service precautions, and technical service bulletins.
- Diagnose fluid loss and condition concerns; determine necessary action.
- Check fluid level in a transmission or a transaxle equipped with a dip-stick.
- Check fluid level in a transmission or a transaxle not equipped with a dip-stick.
- Perform pressure tests (including transmissions/transaxles equipped with electronic pressure control); determine necessary action.
- Diagnose noise and vibration concerns; determine necessary action.
- Perform stall test; determine necessary action.
- Perform lock-up converter system tests; determine necessary action.
- Diagnose transmission/transaxle gear reduction/multiplication concerns using driving, driven, and held member (power flow) principles.
- Diagnose electronic transmission/transaxle control systems using appropriate test equipment and service information.
- Diagnose pressure concerns in a transmission using hydraulic principles (Pascal’s Law).
Complete Level 3 NATEF tasks related to In-Vehicle Transmission/Transaxle Maintenance and Repair as listed below
- Inspect, adjust, and replace external manual valve shift linkage, transmission range sensor/switch, and park/neutral position switch.
- Inspect for leakage; replace external seals, gaskets, and bushings.
- Inspect, test, adjust, repair, or replace electrical/electronic components and circuits including computers, solenoids, sensors, relays, terminals, connectors, switches, and harnesses.
- Drain and replace fluid and filter(s).
- Inspect powertrain mounts.
Complete Level 3 NATEF tasks related to Off-Vehicle Transmission and Transaxle Repair as listed below.
- Remove and reinstall transmission/transaxle and torque converter; inspect engine core plugs, rear crankshaft seal, dowel pins, dowel pin holes, and mating surfaces.
- Inspect, leak test, and flush or replace transmission/transaxle oil cooler, lines, and fittings.
- Inspect converter flex (drive) plate, converter attaching bolts, converter pilot, converter pump drive surfaces, converter end play, and crankshaft pilot bore.
- Describe the operational characteristics of a continuously variable transmission (CVT).
- Describe the operational characteristics of a hybrid vehicle drive train.