AT AUTOMOTIVE
TECHNOLOGY NATEF TASK LIST (2002)
AT1 ENGINE REPAIR
AT1A General
Engine Diagnosis; Removal and Reinstallation (R & R)
AT1A01 Identify and interpret engine
concern; determine necessary action P1
AT1A02 Research applicable vehicle and
service information, such as internal engine operation, vehicle service
history, service precautions, and technical service bulletins P1
AT1A03 Locate and interpret vehicle and
major component identification numbers (VIN, vehicle certification labels, and
calibration decals) P1
AT1A04 Inspect engine assembly for
fuel, oil, coolant, and other leaks; determine necessary action P1
AT1A05 Diagnose engine noises and
vibrations; determine necessary action P2
AT1A06 Diagnose the cause of excessive
oil consumption, unusual engine exhaust color, odor, and sound; determine
necessary action P2
AT1A07 Perform engine vacuum tests;
determine necessary action P1
AT1A08 Perform cylinder power balance
tests; determine necessary action P1
AT1A09 Perform cylinder compression
tests; determine necessary action P1
AT1A10 Perform cylinder leakage tests;
determine necessary action P1
AT1A11 Remove and reinstall engine in a
late model front-wheel drive vehicle (OBDI or newer); reconnect all attaching
components and restore the vehicle to running condition P1
AT1A12 Remove and reinstall engine in a
late model rear-wheel drive vehicle (OBDI or newer); reconnect all attaching
components and restore the vehicle to running condition P3
AT1B Cylinder
Head and Valve Train Diagnosis and Repair
AT1B01 Remove cylinder head(s);
visually inspect cylinder head(s) for cracks; check gasket surface areas for warpage and leakage; check passage condition P2
AT1B02 Install cylinder heads and
gaskets; tighten according to manufacturer’s specifications and procedures P1
AT1B03 Inspect valve springs for squareness and free height comparison; determine necessary
action P2
AT1B04 Replace valve stem seals on an
assembled engine; inspect valve spring retainers, locks, and valve grooves;
determine necessary action P2
AT1B05 Inspect valve guides for wear;
check valve stem-to-guide clearance; determine necessary action P3
AT1B06 Inspect
valves and valve seats; determine necessary action P3
AT1B07 Check valve face-to-seat contact
and valve seat concentricity (runout); determine
necessary action P3
AT1B08 Check valve spring assembled
height and valve stem height; determine necessary action P3
AT1B09 Inspect pushrods, rocker arms,
rocker arm pivots and shafts for wear, bending, cracks, looseness, and blocked
oil passages (orifices); determine necessary action P2
AT1B10 Inspect
hydraulic or mechanical lifters; determine necessary action P2
AT1B11 Adjust
valves (mechanical or hydraulic lifters) P1
AT1B12 Inspect camshaft drives
(including gear wear and backlash, sprocket and chain wear); determine
necessary action P2
AT1B13 Inspect and replace timing belts
(chains), overhead camdrive sprockets, and tensioners; check belt/chain tension; adjust as necessary P1
AT1B14 Inspect
camshaft for runout, journal wear and lobe wear P2
AT1B15 Inspect camshaft bearing surface
for wear, damage, out-of-round, and alignment; determine necessary action P3
AT1B16 Establish camshaft(s) timing and
cam sensor indexing according to manufacturer’s specifications and procedures P1
AT1C Engine Block
Assembly Diagnosis and Repair
AT1C01 Disassemble engine block; clean
and prepare components for inspection and reassembly P2
AT1C02 Inspect engine block for visible
cracks, passage condition, core and gallery plug condition, and surface warpage; determine necessary action P2
AT1C03 Inspect internal and external
threads; restore as needed (includes installing thread inserts) P2
AT1C04 Inspect and measure cylinder
walls for damage, wear, and ridges; determine necessary action P2
AT1C05 Deglaze
and clean cylinder walls P2
AT1C06 Inspect and measure camshaft
bearings for wear, damage, out-of-round, and alignment; determine necessary
action P3
AT1C07 Inspect crankshaft for end play,
straightness, journal damage, keyway damage, thrust flange and sealing surface
condition, and visual surface cracks; check oil passage condition; measure
journal wear; check crankshaft sensor reluctor ring (where applicable);
determine necessary action P2
AT1C08 Inspect and measure main and
connecting rod bearings for damage, clearance, and end play; determine
necessary action (includes the proper selection of bearings) P2
AT1C09 Identify piston and bearing wear
patterns that indicate connecting rod alignment and main bearing bore problems;
inspect rod alignment and bearing bore condition P3
AT1C10 Inspect
and measure pistons; determine necessary action P2
AT1C11 Remove
and replace piston pin P3
AT1C12 Inspect,
measure, and install piston rings P1
AT1C13 Inspect auxiliary (balance,
intermediate, idler, counterbalance or silencer) shaft(s); inspect shaft(s) and
support bearings for damage and wear; determine necessary action; reinstall and
time P2
AT1C14 Inspect
or replace crankshaft vibration damper (harmonic balancer) P3
AT1C15 Assemble the engine using
gaskets, seals, and formed-in-place (tube-applied) sealants, thread sealers,
etc according to manufacturer’s specifications P2
AT1D Lubrication
and Cooling Systems Diagnosis and Repair
AT1D01 Perform oil pressure tests;
determine necessary action P1
AT1D02 Inspect oil pump gears or
rotors, housing, pressure relief devices, and pump drive; perform necessary
action P2
AT1D03 Perform cooling system, cap, and
recovery system tests (pressure, combustion leakage, and temperature);
determine necessary action P1
AT1D04 Inspect, replace, and adjust
drive belts, tensioners, and pulleys; check pulley
and belt alignment P1
AT1D05 Inspect and replace engine
cooling and heater system hoses P1
AT1D06 Inspect, test, and replace
thermostat and housing P2
AT1D07 Test coolant; drain and recover
coolant; flush and refill cooling system with recommended coolant; bleed air as
required P1
AT1D08 Inspect, test, remove, and
replace water pump P1
AT1D09 Remove and replace radiator P2
AT1D10 Inspect, and test fans(s)
(electrical or mechanical), fan clutch, fan shroud, and air dams P2
AT1D11 Inspect auxiliary oil coolers;
determine necessary action P3
AT1D12 Inspect, test, and replace oil
temperature and pressure switches and sensors P2
AT1D13 Perform oil and filter change P2
AT2 AUTOMATIC
TRANSMISSION AND TRANSAXLE
AT2A General
Transmission and Transaxle Diagnosis
AT2A01 Identify and interpret
transmission/transaxle concern; assure proper engine operation; determine
necessary action P1
AT2A02 Research applicable vehicle and
service information, such as transmission/transaxle system operation, vehicle
service history, service precautions, and technical service bulletins P1
AT2A03 Locate and interpret vehicle and
major component identification numbers (VIN, vehicle certification labels, and
calibration decals) P1
AT2A04 Diagnose fluid usage, level, and
condition concerns; determine necessary action P1
AT2A05 Perform pressure tests;
determine necessary action P1
AT2A06 Perform stall test; determine
necessary action P2
AT2A07 Perform lock-up converter system
tests; determine necessary action P1
AT2A08 Diagnose electronic, mechanical,
hydraulic, vacuum control system concerns; determine necessary action P1
AT2A09 Diagnose noise and vibration
concerns; determine necessary action P2
AT2A10 Diagnose transmission/transaxle
gear reduction/multiplication concerns using driving, driven, and held member
(power flow) principles P1
AT2B Transmission
and Transaxle Maintenance and Adjustment
AT2B01 Inspect, adjust or replace
throttle valve (TV) linkages or cables; manual shift linkages
or cables; transmission range sensor; check gear select indicator (as
applicable) P1
AT2B02 Service transmission; perform
visual inspection; replace fluids and filters P1
AT2C In-Vehicle
Transmission and Transaxle Repair
AT2C01 Inspect, adjust or replace (as
applicable) vacuum modulator; inspect and repair or replace lines and hoses P3
AT2C02 Inspect,
repair, and replace governor assembly P3
AT2C03 Inspect
and replace external seals and gaskets P2
AT2C04 Inspect extension housing,
bushings and seals; perform necessary action P3
AT2C05 Inspect,
leak test, flush, and replace cooler, lines, and fittings P2
AT2C06 Inspect and replace speedometer
drive gear, driven gear, vehicle speed sensor (VSS), and retainers P2
AT2C07 Diagnose electronic transmission
control systems using a scan tool; determine necessary action P1
AT2C08 I Inspect, replace, and align powertrain
mounts P2
AT2D Off-Vehicle
Transmission and Transaxle Repair
AT2D01 Removal, Disassembly, and
Reinstallation
AT2D011 Remove and reinstall transmission
and torque converter (rear-wheel drive) P2
AT2D012 Remove and reinstall transaxle and
torque converter assembly P1
AT2D013 Disassemble, clean, and inspect
transmission/transaxle P1
AT2D014 Inspect, measure, clean, and
replace valve body (includes surfaces and bores, springs, valves, sleeves,
retainers, brackets, check-balls, screens, spacers, and gaskets) P2
AT2D015 Inspect servo bore, piston, seals,
pin, spring, and retainers; determine necessary action P3
AT2D016 Inspect accumulator bore, piston,
seals, spring, and retainer; determine necessary action P3
AT2D017 Assemble transmission/transaxle P1
AT2D02 Oil Pump and Converter
AT2D021 Inspect converter flex plate,
attaching parts, pilot, pump drive, and seal areas P2
AT2D022 Measure torque converter endplay
and check for interference; check stator clutch P2
AT2D023 Inspect, measure, and reseal oil
pump assembly and components P1
AT2D03 Gear Train, Shafts, Bushings and
Case
AT2D031 Measure endplay or preload;
determine necessary action P1
AT2D032 Inspect, measure, and replace
thrust washers and bearings P2
AT2D033 Inspect oil delivery seal rings,
ring grooves, and sealing surface areas P2
AT2D034 Inspect bushings; determine
necessary action P2
AT2D035 Inspect and measure planetary gear
assembly (includes sun, ring gear, thrust washers, planetary gears, and carrier
assembly); determine necessary action P2
AT2D036 Inspect case bores, passages,
bushings, vents, and mating surfaces; determine necessary action P2
AT2D037 Inspect transaxle drive, link
chains, sprockets, gears, bearings, and bushings; perform necessary action P2
AT2D038 Inspect, measure, repair, adjust or
replace transaxle final drive components P2
AT2D039 Inspect and reinstall parking pawl,
shaft, spring, and retainer; determine necessary action P3
AT2D04 Friction and Reaction Units
AT2D041 Inspect clutch drum, piston,
check-balls, springs, retainers, seals, and friction and pressure plates;
determine necessary action P2
AT2D042 Measure clutch pack clearance;
determine necessary action P1
AT2D043 Air test operation of clutch and
servo assemblies P1
AT2D044 Inspect roller and sprag clutch, races, rollers, sprags,
springs, cages, and retainers; replace as needed P1
AT2D045 Inspect bands and drums; determine
necessary action P2
AT3A01 Identify and interpret drive
train concern; determine necessary action P1
AT3A02 Research applicable vehicle and
service information, such as drive train system operation, vehicle service
history, service precautions, and technical service bulletins P1
AT3A03 Locate and interpret vehicle and
major component identification numbers (VIN, vehicle certification labels,
calibration decals) P1
AT3A04 Diagnose fluid usage, level, and
condition concerns; determine necessary action P1
AT3A05 Drain and fill manual
transmission/transaxle and final drive unit P2
AT3B Clutch
Diagnosis and Repair
AT3B01 Diagnose clutch noise, binding,
slippage, pulsation, and chatter; determine necessary action P1
AT3B02 Inspect clutch pedal linkage,
cables, automatic adjuster mechanisms, brackets, bushings, pivots, and springs;
perform necessary action P1
AT3B03 Inspect hydraulic clutch slave
and master cylinders, lines, and hoses; determine necessary action P1
AT3B04 Inspect release (throw-out)
bearing, lever, and pivot; determine necessary action P1
AT3B05 Inspect
and replace clutch pressure plate assembly and clutch disc P1
AT3B06 Bleed
clutch hydraulic system P1
AT3B07 Inspect,
remove or replace pilot bearing or bushing (as applicable) P1
AT3B08 Inspect flywheel and ring gear
for wear and cracks, determine necessary action P1
AT3B09 Inspect engine block, clutch
(bell) housing, transmission/transaxle case mating surfaces, and alignment
dowels; determine necessary action P3
AT3B10 Measure flywheel runout and crankshaft endplay; determine necessary action P3
AT3C Transmission/Transaxle
Diagnosis and Repair
AT3C01 Remove
and reinstall transmission/transaxle P1
AT3C02 Disassemble, clean, and
reassemble transmission/transaxle components P2
AT3C03 Inspect transmission/transaxle
case, extension housing, case mating surfaces, bores, bushings, and vents;
perform necessary action P3
AT3C04 Diagnose noise, hard shifting,
jumping out of gear, and fluid leakage concerns; determine necessary action P2
AT3C05 Inspect, adjust, and reinstall
shift linkages, brackets, bushings, cables, pivots, and levers P2
AT3C06 Inspect
and reinstall powertrain mounts P3
AT3C07 Inspect
and replace gaskets, seals, and sealants; inspect sealing surfaces P2
AT3C08 Remove
and replace transaxle final drive P3
AT3C09 Inspect, adjust, and reinstall
shift cover, forks, levers, grommets, shafts, sleeves, detent mechanism,
interlocks, and springs P2
AT3C10 Measure endplay or preload (shim
or spacer selection procedure) on transmission/transaxle shafts; perform
necessary action P1
AT3C11 Inspect and reinstall
synchronizer hub, sleeve, keys (inserts), springs, and blocking rings P2
AT3C12 Inspect and reinstall
speedometer drive gear, driven gear, vehicle speed sensor (VSS), and retainers P2
AT3C13 Diagnose transaxle final drive
assembly noise and vibration concerns; determine necessary action P3
AT3C14 Remove, inspect, measure,
adjust, and reinstall transaxle final drive pinion gears (spiders), shaft, side
gears, side bearings, thrust washers, and case assembly P2
AT3C15 Inspect lubrication devices (oil
pump or slingers); perform necessary action P3
AT3C16 Inspect, test, and replace
transmission/transaxle sensors and switches P1
AT3D Drive
Shaft and Half Shaft, Universal and Constant-Velocity (CV) Joint Diagnosis and
Repair
AT3D01 Diagnose constant-velocity (CV)
joint noise and vibration concerns; determine necessary action P1
AT3D02 Diagnose universal joint noise
and vibration concerns; perform necessary action P1
AT3D03 Replace front wheel drive (FWD)
front wheel bearing P2
AT3D04 Inspect, service, and replace
shafts, yokes, boots, and CV joints P1
AT3D05 Inspect, service, and replace
shaft center support bearings P3
AT3D06 Check shaft balance; measure
shaft runout; measure and adjust driveline angles P2
AT3E01 Ring
and Pinion Gears and Differential Case Assembly
AT3E0101 Diagnose noise and vibration
concerns; determine necessary action P2
AT3E0102 Diagnose fluid leakage concerns;
determine necessary action P2
AT3E0103 Inspect and replace companion flange
and pinion seal; measure companion flange runout P2
AT3E0104 Inspect ring gear and measure runout; determine necessary action P2
AT3E0105 Remove, inspect, and reinstall drive
pinion and ring gear, spacers, sleeves, and bearings P2
AT3E0106 Measure and adjust drive pinion
depth P2
AT3E0107 Measure and adjust drive pinion
bearing preload P1
AT3E0108 Measure and adjust side bearing
preload and ring and pinion gear total backlash and backlash variation on a
differential carrier assembly (threaded cup or shim types) P2
AT3E0109 Check ring and pinion tooth contact
patterns; perform necessary action P1
AT3E0110 Disassemble, inspect, measure, and
adjust or replace differential pinion gears (spiders), shaft, side gears, side
bearings, thrust washers, and case P2
AT3E0111 Reassemble and reinstall
differential case assembly; measure runout; determine
necessary action P2
AT3E02 Limited
Slip Differential
AT3E021 Diagnose noise, slippage, and
chatter concerns; determine necessary action P3
AT3E022 Inspect and flush differential
housing; refill with correct lubricant P2
AT3E023 Inspect and reinstall clutch (cone
or plate) components P3
AT3E024 Measure rotating torque; determine
necessary action P3
AT3E031 Diagnose drive axle shafts,
bearings, and seals for noise, vibration, and fluid leakage concerns; determine
necessary action P2
AT3E032 Inspect and replace drive axle
shaft wheel studs P3
AT3E033 Remove and replace drive axle
shafts P1
AT3E034 Inspect and replace drive axle
shaft seals, bearings, and retainers P2
AT3E035 Measure drive axle flange runout and shaft endplay; determine necessary action P2
AT3F01 Diagnose noise, vibration, and
unusual steering concerns; determine necessary action P3
AT3F02 Inspect, adjust, and repair
shifting controls (mechanical, electrical, and vacuum), bushings, mounts,
levers, and brackets P3
AT3F03 Remove
and reinstall transfer case P3
AT3F04 Disassemble,
service, and reassemble transfer case and components P3
AT3F05 Inspect front-wheel bearings
and locking hubs; perform necessary action P3
AT3F06 Check
drive assembly seals and vents; check lube level P3
AT3F07 Diagnose test, adjust, and
replace electrical/electronic components of four-wheel drive systems P3
AT4 SUSPENSION
AND STEERING
AT4A General
Suspension and Steering Systems Diagnosis
AT4A01 Identify and interpret
suspension and steering concern; determine necessary action P1
AT4A02 Research applicable vehicle and
service information, such as suspension and steering system operation, vehicle
service history, service precautions, and technical service bulletins P1
AT4A03 Locate and interpret vehicle and
major component identification numbers (VIN, vehicle certification labels,
calibration decals) P1
AT4B Steering
Systems Diagnosis and Repair
AT4B01 Disable
and enable supplemental restraint system (SRS) P1
AT4B02 Remove and replace steering
wheel; center/time supplemental restraint system (SRS) coil (clock spring) P1
AT4B03 Diagnose steering column noises,
looseness, and binding concerns (including tilt mechanisms); determine
necessary action P2
AT4B04 Diagnose power steering gear
(non-rack and pinion) binding, uneven turning effort, looseness, hard steering,
and fluid leakage concerns; determine necessary action P3
AT4B05 Diagnose power steering gear
(rack and pinion) binding, uneven turning effort, looseness, hard steering, and
fluid leakage concerns; determine necessary action P3
AT4B06 Inspect steering shaft
universal-joint(s), flexible coupling(s), collapsible column, lock cylinder
mechanism, and steering wheel; perform necessary action P2
AT4B07 Adjust manual or power non-rack
and pinion worm bearing preload and sector lash P3
AT4B08 Remove and replace manual or
power rack and pinion steering gear; inspect mounting bushings and brackets P1
AT4B09 Inspect and replace manual or
power rack and pinion steering gear inner tie rod ends (sockets) and bellows
boots P1
AT4B10 Inspect
power steering fluid levels and condition P1
AT4B11 Flush,
fill, and bleed power steering system P2
AT4B12 Diagnose
power steering fluid leakage; determine necessary action P2
AT4B13 Remove,
inspect, replace, and adjust power steering pump belt P1
AT4B14 Remove
and reinstall power steering pump P3
AT4B15 Remove and reinstall power
steering pump pulley; check pulley and belt alignment P3
AT4B16 Inspect
and replace power steering hoses and fittings P2
AT4B17 Inspect and replace pitman arm,
relay (centerlink/intermediate) rod, idler arm and
mountings, and steering linkage damper P2
AT4B18 Inspect, replace, and adjust tie
rod ends (sockets), tie rod sleeves, and clamps P1
AT4B19 Test and diagnose components of
electronically controlled steering systems using a scan tool; determine
necessary action P3
AT4C Suspension
Systems Diagnosis and Repair
AT4C01 Front
Suspension
AT4C0101 Diagnose short and long arm
suspension system noises, body sway, and uneven riding height concerns;
determine necessary action P1
AT4C0102 Diagnose strut suspension system
noises, body sway, and uneven riding height concerns; determine necessary
action P1
AT4C0103 Remove, inspect, and install upper
and lower control arms, bushings, shafts, and rebound bumpers P3
AT4C0104 Remove, inspect and install strut
rods (compression/tension) and bushings P2
AT4C0105 Remove, inspect, and install upper
and/or lower ball joints P2
AT4C0106 Remove, inspect, and install steering
knuckle assemblies P2
AT4C0107 Remove, inspect, and install short
and long arm suspension system coil springs and spring insulators P2
AT4C0108 Remove, inspect,
install, and adjust suspension system torsion bars; inspect mounts P3
AT4C0109 Remove, inspect, and install
stabilizer bar bushings, brackets, and links P2
AT4C0110 Remove, inspect, and install strut
cartridge or assembly, strut coil spring, insulators (silencers), and upper
strut bearing mount P1
AT4C0111 Lubricate suspension and steering
systems P2
AT4C02 Rear
Suspension
AT4C021 Remove, inspect, and install coil
springs and spring insulators P2
AT4C022 Remove, inspect, and install
transverse links, control arms, bushings, and mounts P2
AT4C023 Remove, inspect,
and install leaf springs, leaf spring insulators (silencers), shackles,
brackets, bushings, and mounts P3
AT4C024 Remove, inspect, and install strut
cartridge or assembly, strut coil spring, and insulators (silencers) P2
AT4C03 Miscellaneous
Service
AT4C031 Inspect, remove, and replace shock
absorbers P1
AT4C032 Remove, inspect, and service or
replace front and rear wheel bearings P1
AT4C033 Test and diagnose components of
electronically controlled suspension systems using a scan tool; determine
necessary action P3
AT4D Wheel
Alignment Diagnosis, Adjustment, and Repair
AT4D01 Differentiate between steering
and suspension concerns using principles of steering geometry (caster, camber,
toe, etc) P1
AT4D02 Diagnose vehicle wander, drift,
pull, hard steering, bump steer, memory steer, torque steer, and steering
return concerns; determine necessary action P1
AT4D03 Perform prealignment
inspection; perform necessary action P1
AT4D04 Measure vehicle riding height;
determine necessary action P1
AT4D05 Check and adjust front and rear
wheel camber; perform necessary action P1
AT4D06 Check and adjust caster; perform
necessary action P1
AT4D07 Check and adjust front wheel
toe; adjust as needed P1
AT4D08 Center steering wheel P1
AT4D09 Check toe-out-on-turns (turning
radius); determine necessary action P2
AT4D10 Check SAI (steering axis
inclination) and included angle; determine necessary action P2
AT4D11 Check and adjust rear wheel toe P2
AT4D12 Check rear wheel thrust angle;
determine necessary action P2
AT4D13 Check for front wheel setback;
determine necessary action P2
AT4D14 Check front cradle (subframe) alignment; determine necessary action P3
AT4E Wheel
and Tire Diagnosis and Repair
AT4E01 Diagnose
tire wear patterns; determine necessary action P1
AT4E02 Inspect
tires; check and adjust air pressure P1
AT4E03 Diagnose wheel/tire vibration,
shimmy, and noise; determine necessary action P2
AT4E04 Rotate
tires according to manufacturer’s recommendations P1
AT4E05 Measure wheel, tire, axle, and
hub runout; determine necessary action P2
AT4E06 Diagnose
tire pull (lead) problem; determine necessary action P2
AT4E07 Balance
wheel and tire assembly (static and dynamic) P1
AT4E08 Dismount,
inspect, repair, and remount tire on wheel P2
AT4E09 Reinstall
wheel; torque lug nuts P1
AT4E10 Inspect
and repair tire P2
AT5 BRAKES
AT5A General
Brake Systems Diagnosis
AT5A01 Identify and interpret brake
system concern; determine necessary action P1
AT5A02 Research applicable vehicle and
service information, such as brake system operation, vehicle service history,
service precautions, and technical service bulletins P1
AT5A03 Locate and interpret vehicle and
major component identification numbers (VIN, vehicle certification labels,
calibration decals) P1
AT5B Hydraulic
System Diagnosis and Repair
AT5B01 Diagnose pressure concerns in the
brake system using hydraulic principles (Paschal’s
Law) P1
AT5B02 Measure
brake pedal height; determine necessary action P2
AT5B03 Check master cylinder for
internal and external leaks and proper operation; determine necessary action P2
AT5B04 Remove,
bench bleed, and reinstall master cylinder P1
AT5B05 Diagnose poor stopping, pulling
or dragging concerns caused by malfunctions in the hydraulic system; determine
necessary action P1
AT5B06 Inspect brake lines, flexible
hoses, and fittings for leaks, dents, kinks, rust, cracks, bulging or wear;
tighten loose fittings and supports; determine necessary action P2
AT5B07 Fabricate and/or install brake
lines (double flare and ISO types); replace hoses, fittings, and supports as
needed P2
AT5B08 Select,
handle, store, and fill brake fluids to proper level P1
AT5B09 Inspect, test, and/or replace
metering (hold-off), proportioning (balance), pressure differential, and
combination valves P2
AT5B10 Inspect,
test, and adjust height (load) sensing proportioning valve P3
AT5B11 Inspect, test, and/or replace
components of brake warning light system P3
AT5B12 Bleed
(manual, pressure, vacuum or surge) brake system P1
AT5B13 Flush
hydraulic system P3
AT5C Drum Brake
Diagnosis and Repair
AT5C01 Diagnose poor stopping, noise,
pulling, grabbing, dragging or pedal pulsation concerns; determine necessary
action P1
AT5C02 Remove, clean (using proper
safety procedures), inspect, and measure brake drums; determine necessary
action P1
AT5C03 Refinish brake drum P1
AT5C04 Remove, clean, and inspect brake
shoes, springs, pins, clips, levers, adjusters/self-adjusters, other related
brake hardware, and backing support plates; lubricate and reassemble P1
AT5C05 Remove,
inspect, and install wheel cylinders P2
AT5C06 Pre-adjust brake shoes and
parking brake before installing brake drums or drum/hub assemblies and wheel
bearings P1
AT5C07 Install wheel, torque lug nuts,
and make final checks and adjustments P1
AT5D Disc Brake
Diagnosis and Repair
AT5D01 Diagnose poor stopping, noise,
pulling, grabbing, dragging or pedal pulsation concerns; determine necessary
action P1
AT5D02 Remove caliper assembly from
mountings; clean and inspect for leaks and damage to caliper housing; determine
necessary action P1
AT5D03 Clean and inspect caliper
mounting and slides for wear and damage; determine necessary action P1
AT5D04 Remove, clean, and inspect pads
and retaining hardware; determine necessary action P1
AT5D05 Disassemble and clean caliper
assembly; inspect parts for wear, rust, scoring, and damage; replace seal,
boot, and damaged or worn parts P2
AT5D06 Reassemble, lubricate, and
reinstall caliper, pads, and related hardware; seat pads, and inspect for leaks P1
AT5D07 Clean, inspect, and measure
rotor with a dial indicator and a micrometer; follow manufacturer’s
recommendations in determining need to machine or replace P1
AT5D08 Remove and reinstall rotor P1
AT5D09 Refinish rotor according to
manufacturer’s recommendations P1
AT5D10 Adjust calipers equipped with an
integrated parking brake system P3
AT5D11 Install wheel, torque lug nuts,
and make final checks and adjustments P1
AT5E Power
Assist Units Diagnosis and Repair
AT5E01 Test pedal free travel with and
without engine running; check power assist operation P2
AT5E02 Check vacuum supply (manifold or
auxiliary pump) to vacuum-type power booster P2
AT5E03 Inspect the vacuum-type power
booster unit for vacuum leaks; inspect the check valve for proper operation;
determine necessary action P2
AT5E04 Inspect and test hydro-boost
system and accumulator for leaks and proper operation; determine necessary
action P3
AT5F Miscellaneous (Wheel Bearings,
Parking Brakes, Electrical, Etc.) Diagnosis and Repair
AT5F01 Diagnose wheel bearing noises,
wheel shimmy, and vibration concerns; determine necessary action P1
AT5F02 Remove, clean, inspect, repack,
and install wheel bearings and replace seals; install hub and adjust wheel
bearings P1
AT5F03 Check parking brake cables and
components for wear, rusting, binding, and corrosion; clean, lubricate, or replace
as needed P2
AT5F04 Check
parking brake operation; determine necessary action P1
AT5F05 Check
operation of parking brake indicator light system P3
AT5F06 Check operation of brake stop
light system; determine necessary action P1
AT5F07 Replace
wheel bearing and race P1
AT5F08 Inspect
and replace wheel studs P1
AT5F09 Remove
and reinstall sealed wheel bearing assembly P2
AT5G Antilock
Brake and Traction Control Systems
AT5G01 Identify and inspect antilock
brake system (ABS) components; determine necessary action P1
AT5G02 Diagnose poor stopping, wheel
lock-up, abnormal pedal feel or pulsation, and noise concerns caused by the
antilock brake system (ABS); determine necessary action P2
AT5G03 Diagnose antilock brake system
(ABS) electronic control(s) and components using self-diagnosis and/or
recommended test equipment; determine necessary action P1
AT5G04 Depressurize high-pressure
components of the antilock brake system (ABS) P3
AT5G05 Bleed the antilock brake system’s
(ABS) front and rear hydraulic circuits P2
AT5G06 Remove and install antilock
brake system (ABS) electrical/electronic and hydraulic components P3
AT5G07 Test, diagnose and service ABS
speed sensors, toothed ring (tone wheel), and circuits using a graphing multimeter (GMM)/digital storage oscilloscope (DSO)
(includes output signal, resistance, shorts to voltage/ground, and frequency
data) P1
AT5G08 Diagnose antilock brake system
(ABS) braking concerns caused by vehicle modifications (tire size, curb height,
final drive ratio, etc.) P3
AT5G09 Identify traction control system
components P3
AT6 ELECTRICAL/ELECTRONIC SYSTEMS
AT6A General
Electrical System Diagnosis
AT6A01 Identify and interpret
electrical/electronic system concern; determine necessary action P1
AT6A02 Research applicable vehicle and
service information, such as electrical/electronic system operation, vehicle
service history, service precautions, and technical service bulletins P1
AT6A03 Locate and interpret vehicle and
major component identification numbers (VIN, vehicle certification labels, and
calibration decals) P1
AT6A04 Diagnose electrical/electronic
integrity for series, parallel and series-parallel circuits using principles of
electricity (Ohm’s Law) P1
AT6A05 Use wiring diagrams during
diagnosis of electrical circuit problems P1
AT6A06 Demonstrate the proper use of a
digital multimeter (DMM) during diagnosis of
electrical circuit problems P1
AT6A07 Check electrical circuits with a
test light; determine necessary action P2
AT6A08 Measure source voltage and
perform voltage drop tests in electrical/electronic circuits using a voltmeter;
determine necessary action P1
AT6A09 Measure current flow in
electrical/electronic circuits and components using an ammeter; determine
necessary action P1
AT6A10 Check continuity and measure
resistance in electrical/electronic circuits and components using an ohmmeter;
determine necessary action P1
AT6A11 Check electrical circuits using
fused jumper wires; determine necessary action P2
AT6A12 Locate shorts, grounds, opens,
and resistance problems in electrical/electronic circuits; determine necessary
action P1
AT6A13 Measure and diagnose the
cause(s) of excessive key-off battery drain (parasitic draw); determine
necessary action P1
AT6A14 Inspect and test fusible links,
circuit breakers, and fuses; determine necessary action P1
AT6A15 Inspect and test switches,
connectors, relays, solid state devices, and wires of electrical/electronic
circuits; perform necessary action P1
AT6A16 Repair wiring harnesses and
connectors P1
AT6A17 Perform solder repair of
electrical wiring P1
AT6B
AT6B01 Perform
battery state-of-charge test; determine necessary action P1
AT6B02 Perform battery capacity test;
confirm proper battery capacity for vehicle application; determine necessary
action P1
AT6B03 Maintain
or restore electronic memory functions P1
AT6B04 Inspect,
clean, fill, and replace battery P2
AT6B05 Perform
slow/fast battery charge P2
AT6B06 Inspect and clean battery
cables, connectors, clamps, and hold-downs; repair or replace as needed P1
AT6B07 Start a vehicle using jumper
cables and a battery or auxiliary power supply P1
AT6C Starting
System Diagnosis and Repair
AT6C01 Perform
starter current draw tests; determine necessary action P1
AT6C02 Perform starter circuit voltage
drop tests; determine necessary action P1
AT6C03 Inspect and test starter relays
and solenoids; determine necessary action P2
AT6C04 Remove
and install starter in a vehicle P1
AT6C05 Inspect and test switches,
connectors, and wires of starter control circuits; perform necessary action P2
AT6C06 Differentiate between electrical
and engine mechanical problems that cause a slow-crank or no-crank condition P2
AT6D Charging
System Diagnosis and Repair
AT6D01 Perform charging system output test;
determine necessary action P1
AT6D02 Diagnose charging system for the
cause of undercharge, no-charge, and overcharge conditions P1
AT6D03 Inspect, adjust, or replace
generator (alternator) drive belts, pulleys, and tensioners;
check pulley and belt alignment P2
AT6D04 Remove, inspect, and install
generator (alternator) P1
AT6D05 Perform charging circuit voltage
drop tests; determine necessary action P1
AT6E Lighting
Systems Diagnosis and Repair
AT6E01 Diagnose the cause of brighter
than normal, intermittent, dim, or no light operation; determine necessary
action P1
AT6E02 Inspect,
replace, and aim headlights and bulbs P2
AT6E03 Inspect and diagnose incorrect
turn signal or hazard light operation; perform necessary action P2
AT6F Gauges, Warning Devices, and Driver Information
Systems Diagnosis and Repair
AT6F01 Inspect and test gauges and
gauge sending units for cause of intermittent, high, low, or no gauge readings;
determine necessary action P1
AT6F02 Inspect and test connectors,
wires, and printed circuit boards of gauge circuits; determine necessary action P3
AT6F03 Diagnose the cause of incorrect
operation of warning devices and other driver information systems; determine
necessary action P1
AT6F04 Inspect and test sensors,
connectors, and wires of electronic instrument circuits; determine necessary
action P2
AT6G Horn
and Wiper/Washer Diagnosis and Repair
AT6G01 Diagnose incorrect horn
operation; perform necessary action P2
AT6G02 Diagnose incorrect wiper
operation; diagnose wiper speed control and park problems; perform necessary
action P2
AT6G03 Diagnose incorrect washer
operation; perform necessary action P2
AT6H Accessories
Diagnosis and Repair
AT6H01 Diagnose incorrect operation of
motor-driven accessory circuits; determine necessary action P2
AT6H02 Diagnose incorrect heated glass
operation; determine necessary action P3
AT6H03 Diagnose incorrect electric lock
operation; determine necessary action P2
AT6H04 Diagnose incorrect operation of
cruise control systems; determine necessary action P3
AT6H05 Diagnose supplemental restraint
system (SRS) concerns; determine necessary action (Note: Follow manufacturer’s
safety procedures to prevent accidental deployment.) P2
AT6H06 Disarm and enable the airbag
system for vehicle service P1
AT6H07 Diagnose radio static and weak,
intermittent, or no radio reception; determine necessary action P3
AT6H08 Remove and reinstall door panel P1
AT6H09 Diagnose body electronic system
circuits using a scan tool; determine necessary action P2
AT6H10 Check for module communication
errors using a scan tool P3
AT6H11 Diagnose the cause of false,
intermittent, or no operation of anti-theft system P2
AT7 HEATING AND AIR CONDITIONING
AT7A A/C
System Diagnosis and Repair
AT7A01 Identify and interpret heating
and air conditioning concern; determine necessary action P1
AT7A02 Research applicable vehicle and
service information, such as heating and air conditioning system operation,
vehicle service history, service precautions, and technical service bulletins P1
AT7A03 Locate and interpret vehicle and
major component identification numbers (VIN, vehicle certification labels,
calibration decals) P1
AT7A04 Performance test A/C system;
diagnose A/C system malfunctions using principles of refrigeration P1
AT7A05 Diagnose abnormal operating
noises in the A/C system; determine necessary action P2
AT7A06 Identify refrigerant type;
conduct a performance test of the A/C system; determine necessary action P1
AT7A07 Leak test A/C system; determine
necessary action P1
AT7A08 Inspect the condition of
discharged oil; determine necessary action P2
AT7A09 Determine recommended oil for
system application P1
AT7B Refrigeration
System Component Diagnosis and Repair
AT7B01 Compressor
and Clutch
AT7B011 Diagnose A/C system conditions
that cause the protection devices (pressure, thermal, and PCM) to interrupt
system operation; determine necessary action P2
AT7B012 Inspect A/C compressor drive
belts; determine necessary action P2
AT7B013 Inspect, test, and/or replace A/C
compressor clutch components and/or assembly P2
AT7B014 Remove and reinstall A/C
compressor and mountings; measure oil quantity; determine necessary action P1
AT7B02 Evaporator,
Condenser, and Related Components
AT7B021 Determine need for an additional
A/C system filter; perform necessary action P3
AT7B022 Remove and inspect A/C system
mufflers, hoses, lines, fittings, O-rings, seals, and service valves; perform
necessary action P2
AT7B023 Inspect A/C condenser for airflow
restrictions; perform necessary action P1
AT7B024 Remove and reinstall
receiver/drier or accumulator/drier; measure oil quantity; determine necessary
action P1
AT7B025 Remove and install expansion valve
or orifice (expansion) tube P2
AT7B026 Inspect evaporator housing water
drain; perform necessary action P3
AT7B027 Remove and reinstall evaporator;
measure oil quantity; determine necessary action P3
AT7B028 Remove and reinstall condenser;
measure oil quantity; determine necessary action P3
AT7C Heating, Ventilation, and Engine Cooling Systems
Diagnosis and Repair
AT7C01 Diagnose temperature control
problems in the heater/ventilation system; determine necessary action P2
AT7C02 Perform cooling system, cap, and
recovery system tests (pressure, combustion leakage, and temperature);
determine necessary action P1
AT7C03 Inspect engine cooling and
heater system hoses and belts; perform necessary action P1
AT7C04 Inspect,
test, and replace thermostat and housing P1
AT7C05 Determine coolant condition and
coolant type for vehicle application; drain and recover coolant P1
AT7C06 Flush system; refill system with
recommended coolant; bleed system P1
AT7C07 Inspect and test cooling fan,
fan clutch, fan shroud, and air dams; perform necessary action P1
AT7C08 Inspect and test electric
cooling fan, fan control system and circuits; determine necessary action P1
AT7C09 Inspect
and test heater control valve(s); perform necessary action P2
AT7C10 Remove
and reinstall heater core P3
AT7D Operating
Systems and Related Controls Diagnosis and Repair
AT7D01 Diagnose malfunctions in the electrical
controls of heating, ventilation, and A/C (HVAC) systems; determine necessary
action P2
AT7D02 Inspect and test A/C-heater
blower, motors, resistors, switches, relays, wiring, and protection devices;
perform necessary action P1
AT7D03 Test and diagnose A/C compressor
clutch control systems; determine necessary action P1
AT7D04 Diagnose malfunctions in the
vacuum and mechanical components and controls of the heating, ventilation, and
A/C (HVAC) system; determine necessary action P2
AT7D05 Inspect and test A/C-heater
control panel assembly; determine necessary action P3
AT7D06 Inspect and test A/C-heater
control cables and linkages; perform necessary action P3
AT7D07 Inspect A/C-heater ducts, doors,
hoses, cabin filters and outlets; perform necessary action P3
AT7D08 Check operation of automatic and
semi-automatic heating, ventilation, and air-conditioning (HVAC) control
systems; determine necessary action P3
AT7E Refrigerant
Recovery, Recycling, and Handling
AT7E01 Perform correct use and
maintenance of refrigerant handling equipment P1
AT7E02 Identify (by label application
or use of a refrigerant identifier) and recover A/C system refrigerant P1
AT7E03 Recycle
refrigerant P1
AT7E04 Label
and store refrigerant P1
AT7E05 Test
recycled refrigerant for non-condensable gases P1
AT7E06 Evacuate
and charge A/C system P1
AT8 ENGINE
PERFORMANCE
AT8A General
Engine Diagnosis
AT8A01 Identify and interpret engine
performance concern; determine necessary action P1
AT8A02 Research applicable vehicle and
service information, such as engine management system operation, vehicle
service history, service precautions, and technical service bulletins P1
AT8A03 Locate and interpret vehicle and
major component identification numbers (VIN, vehicle certification labels, and
calibration decals) P1
AT8A04 Inspect engine assembly for
fuel, oil, coolant, and other leaks; determine necessary action P2
AT8A05 Diagnose abnormal engine noise
or vibration concerns; determine necessary action P2
AT8A06 Diagnose abnormal exhaust color,
odor, and sound; determine necessary action P2
AT8A07 Perform engine absolute
(vacuum/boost) manifold pressure tests; determine necessary action P1
AT8A08 Perform cylinder power balance
test; determine necessary action P1
AT8A09 Perform cylinder compression
tests; determine necessary action P1
AT8A10 Perform cylinder leakage test;
determine necessary action P1
AT8A11 Diagnose engine mechanical,
electrical, electronic, fuel, and ignition concerns with an oscilloscope and/or
engine diagnostic equipment; determine necessary action P1
AT8A12 Prepare 4 or 5 gas analyzer;
inspect and prepare vehicle for test, and obtain exhaust readings; interpret
readings, and determine necessary action P1
AT8A13 Verify engine operating
temperature; determine necessary action P1
AT8A14 Perform cooling system pressure
tests; check coolant condition; inspect and test radiator, pressure cap,
coolant recovery tank, and hoses; perform necessary action P1
AT8A15 Verify correct camshaft timing P2
AT8B Computerized
Engine Controls Diagnosis and Repair
AT8B01 Retrieve and record stored OBD I
diagnostic trouble codes; clear codes P2
AT8B02 Retrieve and record stored OBD
II diagnostic trouble codes; clear codes P1
AT8B03 Diagnose the causes of emissions
or driveability concerns resulting from malfunctions
in the computerized engine control system with stored diagnostic trouble codes P1
AT8B04 Diagnose emissions or driveability concerns resulting from malfunctions in the
computerized engine control system with no stored diagnostic trouble codes;
determine necessary action P1
AT8B05 Check
for module communication errors using a scan tool P2
AT8B06 Inspect and test computerized
engine control system sensors, powertrain control
module (PCM), actuators, and circuits using a graphing multimeter
(GMM)/digital storage oscilloscope (DSO); perform necessary action P1
AT8B07 Obtain
and interpret scan tool data P1
AT8B08 Access and use service
information to perform step-by-step diagnosis P1
AT8B09 Diagnose driveability
and emissions problems resulting from malfunctions of interrelated systems
(cruise control, security alarms, suspension controls, traction controls, A/C,
automatic transmissions, non-OEM-installed accessories, or similar systems);
determine necessary action P3
AT8C Ignition
System Diagnosis and Repair
AT8C01 Diagnose ignition system related
problems such as no-starting, hard starting, engine misfire, poor driveability, spark knock, power loss, poor mileage, and
emissions concerns on vehicles with electronic ignition (distributorless)
systems; determine necessary action P1
AT8C02 Diagnose ignition system related
problems such as no-starting, hard starting, engine misfire, poor driveability, spark knock, power loss, poor mileage, and
emissions concerns on vehicles with distributor ignition (DI) systems;
determine necessary action P1
AT8C03 Inspect and test ignition
primary circuit wiring and solid state components; perform necessary action P2
AT8C04 Inspect,
test and service distributor P3
AT8C05 Inspect and test ignition system
secondary circuit wiring and components; perform necessary action P2
AT8C06 Inspect
and test ignition coil(s); perform necessary action P1
AT8C07 Check and adjust ignition system
timing and timing advance/retard (where applicable) P3
AT8C08 Inspect and test ignition system
pick-up sensor or triggering devices; perform necessary action P1
AT8D Fuel, Air
Induction, and Exhaust Systems Diagnosis and Repair
AT8D01 Diagnose
hot or cold no-starting, hard starting, poor driveability,
incorrect idle speed, poor idle, flooding, hesitation, surging, engine misfire,
power loss, stalling, poor mileage, dieseling, and emissions problems on
vehicles with carburetor-type fuel systems; determine necessary action P3 (This task is gone now)
AT8D02 Diagnose hot or cold no-starting,
hard starting, poor driveability, incorrect idle
speed, poor idle, flooding, hesitation, surging, engine misfire, power loss,
stalling, poor mileage, dieseling, and emissions problems on vehicles with
injection-type fuel systems; determine necessary action P1
AT8D03 Check fuel for contaminants and
quality; determine necessary action P3
AT8D04 Inspect and test mechanical and
electrical fuel pumps and pump control systems for pressure, regulation and
volume; perform necessary action P1
AT8D05 Replace fuel filters P1
AT8D06 Inspect and test cold enrichment
system and components; perform necessary action P3
AT8D07 Inspect throttle body, air
induction system, intake manifold and gaskets for vacuum leaks and/or unmetered air P2
AT8D08 Inspect and test fuel injectors P2
AT8D09 Check idle speed and fuel
mixture P2
AT8D10 Adjust idle speed and fuel
mixture P3
AT8D11 Inspect the integrity of the
exhaust manifold, exhaust pipes, muffler(s), catalytic converter(s),
resonator(s), tail pipe(s), and heat shield(s); perform necessary action P2
AT8D12 Perform exhaust system
back-pressure test; determine necessary action P1
AT8D13 Test the operation of
turbocharger/supercharger systems; determine necessary action P3
AT8E Emissions
Control Systems Diagnosis and Repair
AT8E01 Positive
Crankcase Ventilation
AT8E011 Diagnose oil leaks, emissions, and
driveability problems resulting from malfunctions in
the positive crankcase ventilation (PCV) system; determine necessary action P2
AT8E012 Inspect, test and service positive
crankcase ventilation (PCV) filter/breather cap, valve, tubes, orifices, and
hoses; perform necessary action P2
AT8E02 Exhaust
Gas Recirculation
AT8E021 Diagnose emissions and driveability problems caused by malfunctions in the exhaust
gas recirculation (EGR) system; determine necessary action P1
AT8E022 Inspect, test, service and replace
components of the EGR system, including EGR tubing, exhaust passages,
vacuum/pressure controls, filters and hoses; perform necessary action P2
AT8E023 Inspect and test
electrical/electronic sensors, controls, and wiring of exhaust gas
recirculation (EGR) systems; perform necessary action P2
AT8E03 Exhaust
Gas Treatment
AT8E031 Diagnose emissions and driveability problems resulting from malfunctions in the
secondary air injection and catalytic converter systems; determine necessary action P2
AT8E032 Inspect and test mechanical
components of secondary air injection systems; perform necessary action P3
AT8E033 Inspect and test
electrical/electronically-operated components and circuits of air injection
systems; perform necessary action P3
AT8E034 Inspect and test catalytic
converter performance P1
AT8E04 Intake
Air Temperature Controls
AT8E041 Diagnose emissions and driveability problems resulting from malfunctions in the
intake air temperature control system; determine necessary action P3
AT8E042 Inspect and test components of
intake air temperature control system; perform necessary action P3
AT8E05 Early
Fuel Evaporation (Intake Manifold Temperature) Controls
AT8E051 Diagnose emissions and driveability problems resulting from malfunctions in the
early fuel evaporation control system; determine necessary action P3
AT8E052 Inspect and test components of
early fuel evaporation control system; perform necessary action P3
AT8E06 Evaporative
Emissions Controls
AT8E061 Diagnose emissions and driveability problems resulting from malfunctions in the
evaporative emissions control system; determine necessary action P1
AT8E062 Inspect and test components and
hoses of evaporative emissions control system; perform necessary action P2
AT8E063 Interpret evaporative emission
related diagnostic trouble codes (DTCs); determine
necessary action P1
AT8F Engine
Related Service
AT8F01 Adjust
valves on engines with mechanical or hydraulic lifters P1
AT8F02 Remove
and replace timing belt; verify correct camshaft timing P1
AT8F03 Remove
and replace thermostat P2
AT8F04 Inspect and test
mechanical/electrical fans, fan clutch, fan shroud/ducting, air dams, and fan
control devices; perform necessary action P1