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ASE 0: Foundation Studies

CDX Tasksheet Number NATEF 2013 Tasksheet Title 2013 AST NATEF Reference number PriorityLevel
A. Shop and Personal Safety      
C451 Identify general shop safety rules and procedures. 0A1 P-1
C452 Utilize safe procedures for handling of tools and equipment. 0A2 P-1
C453 Identify and use proper placement of floor jacks and jack stands. 0A3 P-1
C454 Identify and use proper procedures for safe lift operation. 0A4 P-1
C455 Utilize proper ventilation procedures for working within the lab/shop area. 0A5 P-1
C456 Identify marked safety areas. 0A6 P-1
C458 Identify the location and the types of fire extinguishers and other fire safety equipment; demonstrate knowledge of the procedures for using fire extinguishers and other fire safety equipment. 0A7 P-1
C459 Identify the location and use of eye wash stations. 0A8 P-1
C460 Identify the location of posted evacuation routes. 0A9 P-1
C461 Comply with the required safe use of safety glasses, ear protection, gloves, and shoes, during lab/shop activities. 0A10 P-1
C462 Identify and wear appropriate clothing for lab/shop activities. 0A11 P-1
C463 Secure hair and jewelry for lab/shop activities. 0A12 P-1
C464 Demonstrate awareness of the safety aspects of supplemental restraint systems (SRS), electronic brake control systems, and hybrid vehicle high voltage circuits. 0A13 P-1
C895 Demonstrate awareness of the safety aspects of high voltage circuits (such as high intensity discharge (HID) lamps, ignitions systems, injection systems, etc.).  0A14 P-1
C465 Locate and demonstrate knowledge of material safety data sheets (MSDS). 0A15 P-1
B. Tools and Equipment      
C466 Identify tools and their usage in automotive applications. 0B1 P-1
C467 Identify standard and metric designation. 0B2 P-1
C468 Demonstrate safe handling and use of appropriate tools. 0B3 P-1
C469 Demonstrate proper cleaning, storage, and maintenance of tools and equipment. 0B4 P-1
C896 Demonstrate proper use of precision measuring tools (i.e. micrometer, dial-indicator, dial-caliper). 0B5 P-1
C. Preparing Vehicle for Service      
C472 Identify information needed and the service requested on a repair order. 0C1 P-1
C473 Identify purpose and demonstrate proper use of fender covers, mats. 0C2 P-1
C474 Demonstrate use of 3 C’s (concern, cause and correction). 0C3 P-1
C475 Review vehicle service history. 0C4 P-1
C590 Complete work order to include customer information, vehicle identifying information, customer concern, related service history, cause, and correction. 0C5 P-1
D. Preparing Vehicle for Customer      
C476 Ensure vehicle is prepared to return to customer per school/company policy (floor mats, steering wheel cover etc). 0D1 P-1

ASE 1: Engine Repair - (Top)

CDX Tasksheet Number NATEF 2013 Tasksheet Title 2013 AST NATEF Reference number PriorityLevel
A. General: Engine Diagnosis; Removal and Reinstallation (R & R)      
C885 Complete work order to include customer information, vehicle identifying information, customer concern, related service history, cause, and correction. 1A1 P-1
C002 Research applicable vehicle and service information, such as internal engine operation, vehicle service history, service precautions, and technical service bulletins. 1A2 P-1
C898 Verify operation of the instrument panel engine warning indicators.  1A3 P-1
C004 Inspect engine assembly for fuel, oil, coolant, and other leaks; determine necessary action. 1A4 P-1
C541 Install engine covers using gaskets, seals, and sealers as required. 1A5 P-1
C899 Remove and replace timing belt; verify correct camshaft timing. 1A6 P-1
C886 Perform common fastener and thread repair, to include: remove broken bolt, restore internal and external threads, and repair internal threads with thread insert. 1A7 P-1
C596 Inspect, remove and replace engine mounts. 1A8 P-2
C900 Identify hybrid vehicle internal combustion engine service precautions.  1A9 P-3
C671 Remove and reinstall engine in an OBDII or newer vehicle; reconnect all attaching components and restore the vehicle to running condition.  1A10 P-3
B.  Cylinder Head and Valve Train Diagnosis and Repair      
C673 Remove cylinder head; inspect gasket condition; install cylinder head and gasket; tighten according to manufacturer’s specifications and procedures. 1B1 P-1
C674 Clean and visually inspect a cylinder head for cracks; check gasket surface areas for warpage and surface finish; check passage condition. 1B2 P-1
C021 Inspect pushrods, rocker arms, rocker arm pivots and shafts for wear, bending, cracks, looseness, and blocked oil passages (orifices); determine necessary action. 1B3 P-2
C723 Adjust valves (mechanical or hydraulic lifters). 1B4 P-1
C676 Inspect and replace camshaft and drive belt/chain includes checking drive gear wear and backlash, end play, sprocket and chain wear, overhead cam drive sprocket(s, drive belt(s), belt tension, tensioners, camshaft reluctor ring/tone-wheel, and  valve timing components; verify correct camshaft timing. 1B5 P-1
C677 Establish camshaft position sensor indexing. 1B6 P-1
C.  Engine Block Assembly Diagnosis and Repair      
C679 Remove, inspect or replace crankshaft vibration damper (harmonic balancer). 1C1 P-2
D.  Lubrication and Cooling Systems Diagnosis and Repair      
C578 Perform cooling system pressure and dye tests to identify leaks; check coolant condition and level; inspect and test radiator, pressure cap, coolant recovery tank, and heater core and galley plugs; determine necessary action. 1D1 P-1
C598 Identify causes of engine overheating. 1D2 P-1
C734 Inspect, replace, and adjust drive belts, tensioners, and pulleys; check pulley and belt alignment. 1D3 P-1
C050 Inspect and test coolant; drain and recover coolant; flush and refill cooling system with recommended coolant; bleed air as required. 1D4 P-1
C680 Inspect, remove and replace water pump. 1D5 P-2
C052 Remove and replace radiator. 1D6 P-2
C735 Remove, inspect,  and replace thermostat and gasket/seal. 1D7 P-1
C053 Inspect and test fans(s) (electrical or mechanical), fan clutch, fan shroud, and air dams. 1D8 P-1
C732 Perform oil pressure tests; determine necessary action. 1D9 P-1
C737 Perform engine oil and filter change. 1D10 P-1
C871 Inspect auxiliary coolers; determine necessary action. 1D11 P-3
C736 Inspect, test, and replace oil temperature and pressure switches and sensors. 1D12 P-2

ASE 2: Automatic Transmission and Transaxle - (Top)

CDX Tasksheet Number NATEF 2013 Tasksheet Title 2013 AST NATEF Reference number PriorityLevel
A.  General: Transmission and Transaxle Diagnosis      
C599 Identify and interpret transmission/transaxle concern; differentiate between engine performance and transmission/transaxle concerns; determine necessary action. 2A1 P-1
C681 Research applicable vehicle and service information, fluid type, vehicle service history, service precautions, and technical service bulletins. 2A2 P-1
C682 Diagnose fluid loss and condition concerns; determine necessary action. 2A3 P-1
C902 Check fluid level in a transmission or a transaxle equipped with a dip-stick.  2A4 P-1
C903 Check fluid level in a transmission or a transaxle not equipped with a dip-stick.  2A5 P-1
C741 Perform stall test; determine necessary action. 2A6 P-3
C063 Perform lock-up converter system tests; determine necessary action. 2A7 P-3
C066 Diagnose transmission/transaxle gear reduction/multiplication concerns using driving, driven, and held member (power flow) principles. 2A8 P-1
C747 Diagnose pressure concerns in a transmission using hydraulic principles (Pascal’s Law). 2A9 P-2
B.  In-Vehicle Transmission/Transaxle Maintenance and  Repair      
C683 Inspect, adjust, and replace external manual valve shift linkage, transmission range sensor/switch, and park/neutral position switch. 2B1 P-2
C748 Inspect for leakage; replace external seals, gaskets, and bushings. 2B2 P-2
C601 Inspect, test, adjust, repair, or replace electrical/electronic components and circuits, including computers, solenoids, sensors, relays, terminals, connectors, switches, and harnesses. 2B3 P-1
C907 Drain and replace fluid and filter(s). 2B4 P-1
C602 Inspect, replace and align powertrain mounts. 2B5 P-2
C.  Off-Vehicle Transmission and Transaxle Repair      
C604 Remove and reinstall transmission/transaxle and torque converter; inspect engine core plugs, rear crankshaft seal, dowel pins, dowel pin holes, and mating surfaces. 2C1 P-1
C749 Inspect, leak test, and flush or replace transmission/transaxle oil cooler, lines, and fittings. 2C3 P-1
C605 Inspect converter flex (drive) plate, converter attaching bolts, converter pilot, converter pump drive surfaces, converter end play, and crankshaft pilot bore. 2C2 P-2
C606 Describe the operational characteristics of a continuously variable transmission (CVT) 2C4 P-3
C607 Describe the operational characteristics of a hybrid vehicle drive train. 2C5 P-3

ASE 3: Manual Drive Train & Axles - (Top)

CDX Tasksheet Number NATEF 2013 Tasksheet Title 2013 AST NATEF Reference number PriorityLevel
A. General: Drive Train Diagnosis      
C101 Identify and interpret drive train concerns; determine necessary action. 3A1 P-1
C102 Research applicable vehicle and service information, fluid type, vehicle service history, service precautions, and technical service bulletins. 3A2 P-1
C691 Check fluid condition; check for leaks; determine necessary action  3A3 P-1
C105 Drain and refill manual transmission/transaxle and final drive unit. 3A4 P-1
B.  Clutch Diagnosis and Repair      
C106 Diagnose clutch noise, binding, slippage, pulsation, and chatter; determine necessary action. 3B1 P-1
C107 Inspect clutch pedal linkage, cables, automatic adjuster mechanisms, brackets, bushings, pivots, and springs; perform necessary action. 3B2 P-1
C608 Inspect and replace clutch pressure plate assembly, clutch disc, release (throw-out) bearing and linkage, and pilot bearing/bushing (as applicable). 3B3 P-1
C111 Bleed clutch hydraulic system. 3B4 P-1
C938 Check and adjust clutch master cylinder fluid level; check for leaks. 3B5 P-1
C847 Inspect flywheel and ring gear for wear and cracks; determine necessary action. 3B6 P-1
C848 Measure flywheel runout and crankshaft end play; determine necessary action. 3B7 P-2
C.  Transmission/Transaxle Diagnosis and Repair      
C768 Inspect, adjust, and reinstall shift linkages, brackets, bushings, cables, pivots, and levers. 3C1 P-2
C611 Describe the operational characteristics of an electronically controlled manual transmission/transaxle. 3C2 P-3
D.  Drive Shaft and Half Shaft, Universal and Constant-Velocity (CV) Joint Diagnosis  and Repair      
C132 Diagnose constant-velocity (CV) joint noise and vibration concerns; determine necessary action. 3D1 P-1
C133 Diagnose universal joint noise and vibration concerns; perform necessary action. 3D2 P-2
C134 Inspect, remove and replace front wheel drive (FWD) bearings, hubs, and seals. 3D3 P-1
C849 Inspect, service, and replace shafts, yokes, boots, and universal/CV joints. 3D4 P-1
C779 Check shaft balance and phasing; measure shaft runout; measure and adjust driveline angles. 3D5 P-2
E1. Ring and Pinion Gears and Differential Case Assembly      
C785 Clean and inspect differential housing; check for leaks; inspect housing vent. 3E1: 1 P-2
C911 Check and adjust differential housing fluid level.  3E1: 2 P-1
C912 Drain and refill differential housing.  3E1: 3 P-1
C889 Inspect and replace companion flange and pinion seal; measure companion flange runout. 3E1: 4 P-2
E2. Drive Axles       
C154 Inspect and replace drive axle wheel studs. 3E2:1 P-1
C155 Remove and replace drive axle shafts. 3E2:2 P-1
C156 Inspect and replace drive axle shaft seals, bearings, and retainers. 3E2:3 P-2
C850 Measure drive axle flange runout and shaft end play; determine necessary action. 3E2:4 P-2
F.  Four-wheel Drive/All-wheel Drive Component Diagnosis and Repair      
C788 Inspect, adjust, and repair shifting controls (mechanical, electrical, and vacuum), bushings, mounts, levers, and brackets. 3F1 P-3
C876 Inspect front-wheel bearings and locking hubs; perform necessary action(s). 3F2 P-3
C914 Check for leaks at drive assembly seals; check vents; check lube level.  3F3 P-3
C613 Identify concerns related to variations in tire circumference and/or final drive ratios. 3F4 P-3

ASE 4: Suspension and Steering - (Top)

CDX Tasksheet Number NATEF 2013 Tasksheet Title 2013 AST NATEF Reference number PriorityLevel
A. General: Suspension and Steering Systems       
C166 Research applicable vehicle and service information, such as suspension and steering system operation, vehicle service history, service precautions, and technical service bulletins. 4A1 P-1
B. Steering Systems Diagnosis and Repair      
C168 Disable and enable supplemental restraint system (SRS). 4B1 P-1
C169 Remove and replace steering wheel; center/time supplemental restraint system (SRS) coil (clock spring). 4B2 P-1
C170 Diagnose steering column noises, looseness, and binding concerns (including tilt mechanisms); determine necessary action. 4B3 P-2
C884 Diagnose power steering gear (non-rack and pinion) binding, uneven turning effort, looseness, hard steering, and noise concerns; determine necessary action. 4B4 P-2
C880 Diagnose power steering gear (rack and pinion) binding, uneven turning effort, looseness, hard steering, and noise concerns; determine necessary action. 4B5 P-2
C173 Inspect steering shaft universal-joint(s), flexible coupling(s), collapsible column, lock cylinder mechanism, and steering wheel; perform necessary action. 4B6 P-2
C882 Remove and replace rack and pinion steering gear; inspect mounting bushings and brackets. 4B7 P-2
C883 Inspect  rack and pinion steering gear inner tie rod ends (sockets) and bellows boots; replace as needed 4B8 P-2
C177 Determine proper power steering fluid type; inspect fluid level and condition. 4B9 P-1
C178 Flush, fill, and bleed power steering system. 4B10 P-2
C179 Inspect for power steering fluid leakage; determine necessary action.  4B11 P-1
C180 Remove, inspect, replace, and adjust power steering pump belt. 4B12 P-1
C181 Remove and reinstall power steering pump. 4B13 P-2
C699 Remove and reinstall press fit power steering pump pulley; check pulley and belt alignment. 4B14 P-2
C183 Inspect and replace power steering hoses and fittings. 4B15 P-2
C184 Inspect and replace  pitman arm, relay (centerlink/intermediate) rod, idler arm and mountings, and steering linkage damper. 4B16 P-2
C185 Inspect, replace and adjust tie rod ends (sockets), tie rod sleeves, and clamps. 4B17 P-1
C551 Identify hybrid vehicle power steering system electrical circuits and safety precautions. 4B18 P-2
C700 Inspect  electric power assist steering. 4B19 P-3
C.  Suspension Systems Diagnosis and Repair      
C852 Diagnose short and long arm suspension system noises, body sway, and uneven ride height concerns; determine necessary action. 4C1 P-1
C853 Diagnose strut suspension system noises, body sway, and uneven ride height concerns; determine necessary action. 4C2 P-1
C790 Inspect, remove and install upper and lower control arms, bushings, shafts, and rebound bumpers. 4C3 P-3
C791 Inspect, remove and install strut rods and bushings. 4C4 P-3
C792 Inspect, remove and install upper and/or lower ball joints(with or without wear indicators). 4C5 P-2
C192 Inspect, remove and install steering knuckle assemblies. 4C6 P-3
C193 Inspect, remove and install short and long arm suspension system coil springs and spring insulators. 4C7 P-3
C194 Inspect, remove and install torsion bars and mounts. 4C8 P-3
C793 Inspect, remove and install stabilizer bar (sway bar) bushings, brackets, and links. 4C9 P-3
C794 Inspect, rempove and install strut cartridge or assembly, strut coil spring, insulators (silencers), and upper strut bearing mount. 4C10 P-3
C934 Inspect, remove and install track bar, strut rods/radius arms, and related mounts and bushings.  4C11 P-3
C854 Inspect rear suspension system leaf spring(s), bushings, center pins/bolts, and mounts.  4C12 P-1
D. Related Suspension and Steering Service       
C202 Inspect, remove, and replace shock absorbers; inspect mounts and bushings.  4D1 P-1
C203 Remove, inspect, and service or replace front and rear wheel bearings. 4D2 P-1
C931 Describe the function of the power steering pressure switch.  4D3 P-3
E. Wheel Alignment Diagnosis, Adjustment, and Repair      
C206 Diagnose vehicle wander, drift, pull, hard steering, bump steer, memory steer, torque steer, and steering return concerns; determine necessary action. 4E1 P-1
C617 Perform prealignment inspection and measure vehicle ride height; perform necessary action. 4E2 P-1
C618 Prepare vehicle for wheel alignment on the alignment machine; perform four wheel alignment by checking and adjusting front and rear wheel caster, camber; and toe as required; center steering wheel. 4E3 P-1
C213 Check toe-out-on-turns (turning radius); determine necessary action. 4E4 P-2
C214 Check SAI (steering axis inclination) and included angle; determine necessary action. 4E5 P-2
C216 Check rear wheel thrust angle; determine necessary action. 4E6 P-1
C217 Check for front wheel setback; determine necessary action. 4E7 P-2
C795 Check front and/or rear cradle (subframe) alignment; determine necessary action. 4E8 P-3
C940 Reset steering angle sensor 4E9 P-2
F. Wheels and Tires Diagnosis and Repair      
C619 Inspect tire condition; identify tire wear patterns; check for correct tire size and application (load and speed ratings) and adjust air pressure; determine necessary action. 4F1 P-1
C855 Diagnose wheel/tire vibration, shimmy, and noise; determine necessary action. 4F2 P-2
C222 Rotate tires according to manufacturer’s recommendations. 4F3 P-1
C701 Measure wheel, tire, axle flange, and hub runout; determine necessary action. 4F4 P-2
C796 Diagnose tire pull problems; determine necessary action. 4F5 P-2
C620 Dismount, inspect, and remount tire on wheel; Balance wheel and tire assembly (static and dynamic). 4F6 P-1
C621 Dismount, inspect, and remount tire on wheel equipped with tire pressure monitoring system sensor. 4F7 P-2
C580 Inspect tire and wheel assembly for air loss; perform necessary action. 4F8 P-1
C552 Repair tire using internal patch. 4F9 P-1
C935 Identify and test tire pressure monitoring systems (indirect and direct) for operation; verify operation of instrument panel lamps.  4F10 P-2
C936 Demonstrate knowledge of steps required to remove and replace sensors in a tire pressure monitoring system.  4F11 P-1

ASE 5: Brakes - (Top)

CDX Tasksheet Number NATEF 2013 Tasksheet Title 2013 AST NATEF Reference number PriorityLevel
A. General: Brake Systems Diagnosis      
C229 Identify and interpret brake system concerns; determine necessary action. 5A1 P-1
C230 Research applicable vehicle and service information, such as brake system operation, vehicle service history, service precautions, and technical service bulletins. 5A2 P-1
C944 Describe procedure for performing a road test to check brake system operation, including an anti-lock brake system (ABS). 5A3 P-1
C251 Install wheel and torque lug nuts. 5A4 P-1
B. Hydraulic System Diagnosis and Repair      
C894 Diagnose pressure concerns in the brake system using hydraulic principles (Pascal’s Law). 5B1 P-1
C622 Measure brake pedal height, travel, and free play (as applicable); determine necessary action. 5B2 P-1
C704 Check master cylinder for internal/external leaks and proper operation; determine necessary action. 5B3 P-1
C235 Remove, bench bleed, and reinstall master cylinder. 5B4 P-1
C236 Diagnose poor stopping, pulling or dragging concerns caused by malfunctions in the hydraulic system; determine necessary action. 5B5 P-3
C237 Inspect brake lines, flexible hoses, and fittings for leaks, dents, kinks, rust, cracks, bulging, wear; tighten loose fittings and supports; determine necessary action. 5B6 P-1
C623 Replace brake lines, hoses, fittings, and supports. 5B7 P-2
C624 Fabricate brake lines using proper material and flaring procedures (double flare and ISO types). 5B8 P-2
C239 Select, handle, store, and fill brake fluids to proper level. 5B9 P-1
C242 Inspect, test, and/or replace components of brake warning light system. 5B10 P-3
C947 Identify components of the brake warning light system 5B11 P-2
C705 Bleed and/or flush brake system. 5B12 P-1
C625 Test brake fluid for contamination. 5B13 P-1
C. Drum Brake Diagnosis and Repair      
C706 Diagnose poor stopping, noise, vibration, pulling, grabbing, dragging or pedal pulsation concerns; determine necessary action. 5C1 P-1
C800 Remove, clean, inspect, and measure brake drum diameter; determine necessary action. 5C2 P-1
C626 Refinish brake drum and measure final drum diameter; compare with specifications. 5C3 P-1
C248 Remove, clean, and inspect brake shoes, springs, pins, clips, levers, adjusters/self-adjusters, other related brake hardware, and backing support plates; lubricate and reassemble. 5C4 P-1
C707 Inspect wheel cylinders for leaks and proper operation; remove and replace as needed. 5C5 P-2
C801 Pre-adjust brake shoes and parking brake; install brake drums or drum/hub assemblies and wheel bearings; make final checks and adjustments. 5C6 P-2
D. Disc Brake Diagnosis and Repair      
C708 Diagnose poor stopping, noise, vibration, pulling, grabbing, dragging or pulsation concerns; determine necessary action. 5D1 P-1
C802 Remove and clean  caliper assembly; inspect for leaks and damage/wear to caliper housing; determine necessary action. 5D2 P-1
C803 Clean and inspect caliper mounting and slides/pins for proper operation, wear, and damage; determine necessary action. 5D3 P-1
C627 Remove, inspect and replace pads and retaining hardware; determine necessary action. 5D4 P-1
C805 Reasasemble, lubricate, and reinstall seat pads and caliper, pads, and related hardware; inspect for leaks. 5D5 P-1
C628 Clean and inspect rotor; measure rotor thickness, thickness variation, and lateral runout; determine necessary action 5D6 P-1
C806 Remove and reinstall rotor. 5D7 P-1
C629 Refinish rotor on vehicle; measure final rotor thickness and compare with specifications. 5D8 P-1
C630 Refinish rotor off vehicle; measure final rotor thickness and compare with specifications.  5D9 P-1
C631 Retract and re-adjust caliper piston on an integral parking brake system.  5D10 P-3
C632 Check brake pad wear indicator; determine necessary action.  5D11 P-2
C948 Describe importance of operating vehicle to burnish/break-in replacement brake pads according to manufacturer's recommendations. 5D12 P-1
E. Power-Assist Units Diagnosis and Repair      
C807 Check brake pedal travel with, and without, engine running to verify proper power booster operation.  5E1 P-2
C808 Check vacuum supply(manifold or auxiliary pump) to vacuum-type power booster. 5E2 P-1
C809 Inspect the vacuum-type power booster unit for leaks; inspect the check valve for proper operation; determine necessary action. 5E3 P-1
C581 Inspect and test hydraulically assisted power brake system for leaks and proper operation; determine necessary action. 5E4 P-3
C556 Measure and adjust master cylinder pushrod length. 5E5 P-3
F. Miscellaneous (Wheel Bearings, Parking Brakes, Electrical, Etc.) Diagnosis and  Repair      
C267 Diagnose wheel bearing noises, wheel shimmy, and vibration concerns; determine necessary action. 5F1 P-3
C810 Remove, clean, inspect, repack, and install wheel bearings; replace seals; install hub and adjust bearings. 5F2 P-1
C811 Check parking brake cables and components for wear, binding, and corrosion; clean, lubricate, adjust or replace as needed. 5F3 P-2
C633 Check parking brake operation and parking brake indicator light system operation; determine necessary action. 5F4 P-1
C272 Check operation of brake stop light system; determine necessary action  5F5 P-1
C273 Replace wheel bearing and race. 5F6 P-2
C274 Inspect and replace wheel studs. 5F7 P-1
C275 Remove and reinstall sealed wheel bearing assembly. 5F8 P-2
G. Electronic Brake, Traction and Stability Control Systems Diagnosis and Repair       
C634 Identify and inspect electronic brake control system components; determine necessary action. 5G1 P-1
C857 Identify traction control/vehicle stability control system components.  5G2 P-3
C950 Describe the operation of a regenerative braking system.  5G3 P-3

ASE 6: Electrical/Electronic Systems - (Top)

CDX Tasksheet Number NATEF 2013 Tasksheet Title 2013 AST NATEF Reference number PriorityLevel
A. General: Electrical System Diagnosis      
C286 Research applicable vehicle and service information, vehicle service history, service precautions, and technical service bulletins. 6A1 P-1
C951 Demonstrate knowledge of electrical/electronic series, parallel, and series-parallel circuits using principles of electricity (Ohm's Law).  6A2 P-1
C641 Demonstrate the proper use of a digital multimeter (DMM) when measuring source voltage, voltage drop, (including grounds), current flow and resistance. 6A3 P-1
C296 Demonstrate knowledge of the causes and effects from shorts, grounds, opens, and resistance problems in electrical/electronic circuits.  6A4 P-1
C291 Check operation of electrical circuits with a test light. 6A5 P-1
C295 Check operation of electrical circuits with fused jumper wires. 6A6 P-1
c952 Use wiring diagrams during the diagnosis (troubleshooting) of electrical/electronic circuit problems. 6A7 P-1
C817 Diagnose the cause(s) of excessive key-off battery drain (parasitic draw); determine necessary action. 6A8 P-1
C298 Inspect and test fusible links, circuit breakers, and fuses; determine necessary action. 6A9 P-1
C299 Inspect and test switches, connectors, relays, solenoid solid state devices, and wires of electrical/electronic circuits; determine necessary action. 6A10 P-1
C643 Replace electrical connectors and terminal ends. 6A11 P-1
C955 Repair wiring harness . 6A12 P-3
C301 Perform solder repair of electrical wiring. 6A13 P-1
B. Battery Diagnosis and Service      
C302 Perform battery state-of-charge test; determine necessary action. 6B1 P-1
C818 Confirm proper battery capacity for vehicle application; perform battery capacity test; determine necessary action. 6B2 P-1
C304 Maintain or restore electronic memory functions 6B3 P-1
C644 Inspect and  clean battery; fill battery cells; check battery cables, connectors, clamps, and hold-downs. 6B4 P-1
C819 Perform slow/fast  battery charge according to manufacturer's instructions. 6B5 P-1
C820 Jump-start  vehicle using jumper cables and a booster battery or an auxiliary power supply. 6B6 P-1
C561 Identify high voltage circuits of electric or hybrid electric vehicle and related safety precautions. 6B7 P-3
C645 Identify electronic modules, security systems, radios, and other accessories that require reinitialization or code entry after reconnecting vehicle battery. 6B8 P-1
C874 Identify hybrid vehicle auxiliary (12v) battery service, repair and test procedures. 6B9 P-3
C. Starting System Diagnosis and Repair      
C309 Perform starter current draw tests; determine necessary action. 6C1 P-1
C310 Perform starter circuit voltage drop tests; determine necessary action. 6C2 P-1
C311 Inspect and test starter relays and solenoids; determine necessary action. 6C3 P-2
C312 Remove and install starter in a vehicle. 6C4 P-1
C313 Inspect and test switches, connectors, and wires of starter control circuits; determine necessary action. 6C5 P-2
C314 Differentiate between electrical and engine mechanical problems that cause a slow-crank or no-crank condition. 6C6 P-2
D. Charging System Diagnosis and Repair      
C315 Perform charging system output test; determine necessary action. 6D1 P-1
C316 Diagnose (troubleshoot)  charging system for the cause of undercharge, no-charge, or overcharge conditions. 6D2 P-1
C317 Inspect, adjust, or replace generator (alternator) drive belts;  check pulleys, and tensioners for wear; check pulley and belt alignment. 6D3 P-1
C318 Remove, inspect, and re-install generator (alternator). 6D4 P-1
C319 Perform charging circuit voltage drop tests; determine necessary action. 6D5 P-1
E. Lighting Systems Diagnosis and Repair      
C320 Diagnose (troubleshoot) the cause of brighter-than-normal, intermittent, dim, or no light operation; determine necessary action. 6E1 P-1
C956 Inspect interior and exterior lamps and sockets including headlights and auxiliary lights (fog lights/driving lights); replace as needed.  6E2 P-1
C321 Aim headlights. 6E3 P-2
C564 Identify system voltage and safety precautions associated with high intensity discharge headlights. 6E4 P-2
F. Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair      
C646 Inspect and test gauges and gauge sending units for causes of abnormal gauge readings; determine necessary action. 6F1 P-2
C325 Diagnose (troubleshoot) the cause of incorrect operation of warning devices and oter driver information systems; determine necessary action. 6F2 P-2
G. Horn and Wiper/Washer Diagnosis and Repair      
C327 Diagnose (troubleshoot) causes of  incorrect horn operation; perform necessary action. 6G1 P-1
C328 Diagnose (troubleshoot) causes of incorrect wiper operation; diagnose wiper speed control and park problems; perform necessary action. 6G2 P-2
C329 Diagnose (troubleshoot) windshield washer problems; perform necessary action. 6G3 P-2
H. Accessories Diagnosis and Repair      
C330 Diagnose (troubleshoot) incorrect operation of motor-driven accessory circuits; determine necessary action. 6H1 P-2
C647 Diagnose (troubleshoot) incorrect electric lock operation (including remote keyless entry); determine necessary action. 6H2 P-2
C333 Diagnose (troubleshoot)  incorrect operation of cruise control systems; determine necessary action. 6H3 P-3
C861 Diagnose (troubleshoot) supplemental restraint system (SRS) problems; determine necessary action. 6H4 P-2
C335 Disable and enable an airbag system for vehicle service; verify indicator lamp operation. 6H5 P-1
C337 Remove and reinstall the door panel. 6H6 P-1
C821 Check for module communication errors (including CAN/BUS systems) using a scan tool. 6H7 P-2
C648 Describe the operation of keyless entry/remote-start systems. 6H8 P-3
C957 Verify operation of instrument panel gauges and warning/indicator lights; reset maintenance indicators.  6H9 P-1
C958 Verify windshield wiper and washer operation; replace wiper blades 6H10 P-1

ASE 7: HVAC - (Top)

CDX Tasksheet Number NATEF 2013 Tasksheet Title 2013 AST NATEF Reference number PriorityLevel
A. General: A/C System Diagnosis and Repair      
C341 Identify and interpret heating and air conditioning problems; determine necessary action. 7A1 P-1
C342 Research applicable vehicle and service information, vehicle service history, service precautions, and technical service bulletins. 7A2 P-1
C824 Performance test A/C system; identify problems. 7A3 P-1
C825 Identify abnormal operating noises in the A/C system; determine necessary action. 7A4 P-2
C650 Identify refrigerant type; select and connect proper gauge set; record temperature and pressure readings. 7A5 P-1
C347 Leak test A/C system; determine necessary action. 7A6 P-1
C651 Inspect the condition of refrigerant oil removed from the A/C system; determine necessary action. 7A7 P-2
C652 Determine recommended oil and oil capacity for system application. 7A8 P-1
C566 Using scan tool, observe and record related HVAC data and trouble codes. 7A9 P-3
B. Refrigeration System Component Diagnosis and Repair      
C653 Inspect and replace A/C compressor drive belts, pulleys, and tensioners; determine necessary action. 7B1 P-1
C654 Inspect, test, andor replace A/C compressor clutch components and/or assembly; check compressor clutch air gap; adjust as needed. 7B2 P-2
C826 Remove, inspect, and reinstall A/C compressor and mountings; determine recommended oil quantity. 7B3 P-2
C827 Identify hybrid vehicle A/C system electrical circuits and the service/safety precautions. 7B4 P-2
C863 Determine the need for an additional A/C system filter; perform necessary action. 7B5 P-3
C355 Remove and inspect A/C system mufflers, hoses, lines, fittings, O-rings, seals, and service valves; perform necessary action. 7B6 P-2
C356 Inspect A/C condenser for airflow restrictions; perform necessary action. 7B7 P-1
C829 Remove, inspect, and reinstall receiver/drier or accumulator/drier; determine recommended oil quantity. 7B8 P-2
C873 Remove, inspect, and install expansion valve or orifice (expansion) tube. 7B9 P-1
C830 Inspect evaporator housing water drain; perform necessary action. 7B10 P-1
C831 Determine procedure to remove and reinstall evaporator; determine required oil quantity. 7B11 P-2
C. Heating, Ventilation, and Engine Cooling Systems Diagnosis and Repair      
C364 Inspect engine cooling and heater system hoses; perform necessary action. 7C1 P-1
C370 Inspect and test heater control valve(s); perform necessary action. 7C2 P-2
C864 Determine procedure to remove, inspect, and reinstall heater core. 7C3 P-2
D. Operating Systems and Related Controls Diagnosis and Repair      
C373 Inspect and test A/C-heater blower, motors, resistors, switches, relays, wiring, and protection devices; perform necessary action. 7D1 P-1
C374 Diagnose A/C compressor clutch control systems; determine necessary action. 7D2 P-2
C835 Diagnose malfunctions in the vacuum, mechanical, and electrical components and controls of the heating, ventilation, and A/C (HVAC) system; determine necessary action. 7D3 P-2
C376 Inspect and test A/C-heater control panel assembly; determine necessary action. 7D4 P-3
C865 Inspect and test A/C-heater control cables, motors, and linkages; perform necessary action. 7D5 P-3
C378 Inspect A/C-heater ducts, doors, hoses, cabin filters and outlets; perform necessary action. 7D6 P-1
C655 Identify the source of A/C system odors. 7D7 P-2
C866 Check operation of automatic or semi-automatic heating, ventilation, and A/C (HVAC) control systems; determine necessary action. 7D8 P-2
E. Refrigerant Recovery, Recycling, and Handling      
C656 Perform correct use and maintenance of refrigerant handling equipment according to equipment manufacturer’s standards. 7E1 P-1
C836 Identify and recover A/C system refrigerant. 7E2 P-1
C657 Recycle, label, and store refrigerant. 7E3 P-1
C658 Evacuate and charge A/C system; add refrigerant oil as required. 7E4 P-1

ASE 8: Engine Performance - (Top)

CDX Tasksheet Number NATEF 2013 Tasksheet Title 2013 AST NATEF Reference number PriorityLevel
A. General: Engine Diagnosis      
C386 Identify and interpret engine performance concerns; determine necessary action. 8A1 P-1
C387 Research applicable vehicle and service information, vehicle service history, service precautions, and technical service bulletins. 8A2 P-1
C390 Diagnose abnormal engine noises or vibration concerns; determine necessary action. 8A3 P-3
C391 Diagnose abnormal exhaust color, odor, and sound, consumption, determine necessary action. 8A4 P-2
C392 Perform engine absolute (vacuum/boost) manifold pressure; determine necessary action. 8A5 P-1
C393 Perform cylinder power balance test; determine necessary action. 8A6 P-2
C709 Perform cylinder cranking and running compression tests; determine necessary action. 8A7 P-1
C395 Perform cylinder leakage test; determine necessary action. 8A8 P-1
C710 Diagnose engine mechanical, electrical, electronic, fuel, and ignition concerns; determine necessary action. 8A9 P-2
C398 Verify engine operating temperature; determine necessary action. 8A10 P-1
C400 Verify correct camshaft timing. 8A11 P-1
B. Computerized Controls Diagnosis and Repair      
C659 Retrieve and record diagnostic trouble codes, OBD monitor status, and freeze frame data; clear codes when applicable. 8B1 P-1
C841 Access and use service information to perform step-by-step (troubleshooting) diagnosis. 8B2 P-1
C867 Perform active tests of actuators using a scan tool; determine necessary action. 8B3 P-2
C661 Describe the importance of running all OBDII monitors for repair verification. 8B4 P-1
C. Ignition System Diagnosis and Repair      
C712 Diagnose (troubleshoot) ignition system related problems such as no-starting, hard starting, engine misfire, poor driveability, spark knock, power loss, poor mileage, and emissions concerns; determine necessary action. 8C1 P-2
C663 Inspect and test crankshaft and camshaft position sensor(s); perform necessary action. 8C2 P-1
C664 Inspect, test, and/or replace ignition control module, powertrain/engine control module; reprogram as necessary. 8C3 P-3
C960 Remove and replace spark plugs; inspect secondary ignition components for wear and damage. 8C4 P-1
D. Fuel, Air Induction, and Exhaust Systems Diagnosis and Repair      
C420 Check fuel for contaminants; determine necessary action. 8D1 P-2
C868 Inspect and test fuel pumps and pump control systems for pressure, regulation, and volume; perform necessary action. 8D2 P-1
C422 Replace fuel filter(s). 8D3 P-1
C962 Inspect, service, or replace air filters, filter housings, and intake duct work. 8D4 P-1
C424 Inspect throttle body, air induction system, intake manifold, and gaskets for vacuum leaks and/or unmetered air. 8D5 P-2
C842 Inspect and test fuel injectors. 8D6 P-2
C665 Verify idle control operation. 8D7 P-1
C428 Inspect integrity of the exhaust manifold, exhaust pipes, muffler(s), catalytic converter(s), resonator(s), tail pipe(s), and heat shields; perform necessary action. 8D8 P-1
C963 Inspect condition of exhaust system hangers, brackets, clamps, and heat shields; repair or replace as needed. 8D9 P-1
C429 Perform exhaust system back-pressure test; determine necessary action. 8D10 P-2
C965 Check and refill diesel exhaust fluid (DEF). 8D11 P-3
E. Emissions Control Systems Diagnosis and Repair      
C666 Diagnose oil leaks, emissions, and driveability concerns caused by the positive crankcase ventilation (PCV) system; determine necessary action. 8E1 P-3
C432 Inspect, test, and service positive crankcase ventilation (PCV) filter/breather cap, valve, tubes, orifices, and hoses; perform necessary action. 8E2 P-2
C667 Diagnose emissions and driveability concerns caused by the exhaust gas recirculation (EGR) system; determine necessary action. 8E3 P-3
C434 Inspect, test, service, and replace components of the exhaust gas recirculation (EGR) system including tubing, exhaust passages, vacuum/pressure controls, filters, and hoses; perform necessary action. 8E4 P-2
C438 Inspect and test electrical/electronically-operated components and circuits of air injection systems; perform necessary action. 8E5 P-3
C714 Inspect and test catalytic converter efficiency. 8E6 P-2
C870 Inspect and test components and hoses of the evaporative emissions control system; perform necessary action. 8E7 P-1
C668 Interpret diagnostic trouble codes (DTCs) and scan tool data related to the emissions control systems; determine necessary action. 8E8 P-3

Non-NATEF Tasks - (Top)

CDX Tasksheet Number NATEF 2013 Tasksheet Title 2013 AST NATEF Reference number PriorityLevel
Non-NATEF Tasks      
C471 Proper vehicle identification information, Define the use and purpose of the VIN, engine numbers and data code, Locate VIN, Apply knowledge of VIN information. N/A  
NN00 Shop Diagram N/A  
NN01 Demonstrate the use of the 3 Cs (concern, cause, and correction). N/A  
NN02 Demonstrate the use of the 3 Cs (concern, cause, and correction). N/A  
NN03 Demonstrate use of 3 Cs (concern, cause, and correction). N/A  
NN04 Demonstrate use of 3 Cs (concern, cause, correction). N/A  
NN05 Demonstrate use of 3 Cs (concern, cause, and correction). N/A  
NN06 Demonstrate the use of 3 Cs (concern, cause, and correction). N/A  
NN07 Demonstrate use of the 3 Cs: concern, cause, and correction N/A  
NN08 Demonstrate use of 3 Cs (concern, cause, and correction). N/A  
NN09 Perform cranking sound diagnosis. N/A  
NN10 Inspect and replace engine cooling and heater
system hoses.		 N/A  
NN12 Chesney Parasitic Load test N/A  
C182 Replace power steering pump filter(s).  N/A