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Truck Mechanic

Competency-based
ONET: 49-3031.00

4

Years

310

Skills

1427h

Related instructions
Classroom instruction topics
  • Pneumatics and Hydraulics
  • Preventative Maintenance
  • Heavy Vehicle Brakes
  • Electrical/Electronic Fundamentals
  • Heavy Vehicle Steering & Suspension
  • Freshman Seminar
  • Basic Engines
  • Electronic Engine Systems
  • Advanced Engine Analysis
  • Fuel Systems
  • Diesel Emissions & After Treatment Systems
  • English Composition I
  • Vehicle Maintenance and Safe Operating Practices
  • CDL License Preparation
  • Heating, Air Conditioning/Refrigeration Systems
  • Diesel Electronic Systems (Cab/Chassis)
  • Intermediate College Algebra
  • Heavy Vehicle Drive Trains
  • Industrial & Agricultural Equipment
On-the-job training
  • R.S.T. Shop and Personal Safety
    • R.S.1 Identify general shop safety rules and procedures.
    • R.S.2 Utilize safe procedures for handling of tools and equipment.
    • R.S.3 Identify and use proper placement of floor jacks and jack stands.
    • R.S.4 Identify and use proper procedures for safe lift operation.
    • R.S.5 Utilize proper ventilation procedures for working within the lab/shop area.
    • R.S.6 Identify marked safety areas.
    • R.S.7 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.
    • R.S.8 Identify the location and use of eye wash stations.
    • R.S.9 Identify the location of the posted evacuation routes.
    • R.S.10 Comply with the required use of safety glasses, ear protection, gloves, and shoes during lab/shop activities.
    • R.S.11 Identify and wear appropriate clothing for lab/shop activities.
    • R.S.12 Secure hair and jewelry for lab/shop activities.
    • R.S.13 Demonstrate awareness of the safety aspects of supplemental restraint systems (SRS), electronic brake control systems, and hybrid vehicle high voltage circuits.
    • R.S.14 Demonstrate awareness of the safety aspects of high voltage circuits (such as high intensity discharge (HID) lamps, ignition systems, injection systems, etc.).
    • R.S.15 Locate and demonstrate knowledge of material safety data sheets (MSDS).
  • 1. Diesel Engines - 1.A General
    • 1.A.1 Research vehicle service information, including fluid type, vehicle service history, service precautions, and technical service bulletins.
    • 1.A.2 Inspect level and condition of fuel, oil, diesel exhaust fluid (DEF), and coolant.
    • 1.A.3 Inspect engine assembly for fuel, oil, coolant, air, and other leaks; determine needed action.
    • 1.A.4 Diagnose engine operation (starting and running) including: noise, vibration, smoke, etc.; determine needed action.
    • 1.A.5 Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; check and record trip/operational data; reset maintenance monitor (if applicable); interpret digital multimeter (DMM) readings
    • 1.A.6 Identify system components, configurations, and types of the following: cylinder head(s), valve train, engine block, engine lubrication, engine cooling, air induction, exhaust, fuel, and engine braking.
    • 1.A.7 Diagnose engine no-crank, cranks but fails to start, hard starting, and starts but does not continue to run problems; determine needed action.
    • 1.A.8 Diagnose engine surging, rough operation, misfiring, low power, slow deceleration, slow acceleration, and/or shut down problems; determine needed action.
  • 1. Diesel Engines - 1.B Cylinder Head and Valve Train
    • 1.B.1 Inspect electronic wiring harness and brackets for wear, bending, cracks, and proper securement; determine needed action.
    • 1.B.2 Adjust valve bridges (crossheads); adjust valve clearances and injector settings.
  • 1. Diesel Engines - 1.C Engine Block
    • 1.C.1 Inspect crankshaft vibration damper; inspect engine mounts; determine needed action.
    • 1.C.2 Remove, inspect, service, and install pans, covers, gaskets, seals, wear rings, and crankcase ventilation components; determine needed action.
    • 1.C.3 Perform crankcase pressure test; determine needed action.
    • 1.C.4 Install and align flywheel housing; inspect flywheel housing(s) to transmission housing/engine mating surface(s); and measure flywheel housing face and bore runout; determine needed action.
    • 1.C.5 Inspect flywheel/flexplate (including ring gear) and mounting surfaces for cracks and wear; measure runout; determine needed action.
  • 1. Diesel Engines - 1.D Lubrication Systems
    • 1.D.1 Test engine oil pressure; check operation of pressure sensor, gauge, and/or sending unit; test engine oil temperature; check operation of temperature sensor; determine needed action.
    • 1.D.2 Check engine oil level, condition, and consumption; take engine oil sample; determine needed action.
    • 1.D.3 Determine proper lubricant; perform oil and filter service.
    • 1.D.4 Inspect, clean, and test oil cooler and components; determine needed action.
    • 1.D.5 Inspect turbocharger lubrication systems; determine needed action.
    • 1.D.6 Inspect and measure oil pump, drives, inlet pipes, and pick-up screens; check drive gear clearances; determine needed action.
    • 1.D.7 Inspect oil pressure regulator valve(s), by-pass and pressure relief valve(s), oil thermostat, and filters; determine needed action.
  • 1. Diesel Engines - 1.E Cooling System
    • 1.E.1 Check engine coolant type, level, and condition; test coolant for freeze protection and additive package concentration.
    • 1.E.2 Test coolant temperature; test operation of temperature and level sensors, gauge, and/or sending unit; determine needed action.
    • 1.E.3 Inspect and reinstall/replace pulleys, tensioners and drive belts; adjust drive belts and check alignment.
    • 1.E.4 Recover coolant; flush and refill with recommended coolant/additive package; bleed cooling system.
    • 1.E.5 Inspect coolant conditioner/filter assembly for leaks; inspect valves, lines, and fittings; replace as needed.
    • 1.E.6 Inspect water pump, hoses, and clamps; determine needed action.
    • 1.E.7 Inspect and pressure test cooling system(s); pressure test cap, tank(s), and recovery systems; inspect radiator and mountings; determine needed action.
    • 1.E.8 Inspect, test, and repair thermostatic cooling fan system (hydraulic, pneumatic, and electronic) and fan shroud; determine needed action.
    • 1.E.9 Test engine block heater(s); determine needed action.
    • 1.E.10 Diagnose engine coolant consumption; determine needed action.
    • 1.E.11 Inspect thermostat(s), by-passes, housing(s), and seals; replace as needed.
    • 1.E.12 Inspect turbocharger cooling systems; determine needed action.
  • 1. Diesel Engines - 1.F Air Induction and Exhaust Systems
    • 1.F.1 Inspect turbocharger(s), wastegate(s), and piping systems; determine needed action
    • 1.F.2 Diagnose air induction system problems; inspect, clean, and/or replace cooler assembly, piping, hoses, clamps, and mountings; replace air filter as needed; reset restriction indicator (if applicable).
    • 1.F.3 Inspect intake manifold, gaskets, and connections; determine needed action.
    • 1.F.4 Inspect engine exhaust system, exhaust gas recirculation (EGR) system, and exhaust aftertreatment system for leaks, mounting, proper routing, and damaged or missing components; determine needed action.
    • 1.F.5 Inspect crankcase ventilation system; service as needed.
    • 1.F.6 Diagnose problems/faults in the exhaust gas recirculation (EGR) system including: EGR valve, cooler, piping, filter, electronic sensors, controls, and wiring; determine needed action.
    • 1.F.7 Perform air intake system restriction and leakage tests; determine needed action.
    • 1.F.8 Perform intake manifold pressure (boost) test; determine needed action.
    • 1.F.9 Check exhaust back pressure; determine needed action.
    • 1.F.10 Inspect variable ratio geometry turbocharger (VGT), controls, and actuators (pneumatic, hydraulic, and electronic); determine needed action.
    • 1.F.11 Demonstrate knowledge of charge air cooler operation and testing.
    • 1.F.12 Diagnose exhaust aftertreatment system performance problems; determine needed action.
  • 1. Diesel Engines - 1.G Fuel System
    • 1.G.1 Check fuel level and condition; determine needed action.
    • 1.G.2 Inspect fuel tanks, vents, caps, mounts, valves, screens, crossover system, hoses, lines, and fittings; determine needed action.
    • 1.G.3 Inspect low pressure fuel system components (fuel pump, pump drives, screens, fuel/water separators/indicators, hoses, lines, filters, heaters, coolers, ECM cooling plates, check valves, pressure regulator valves, restrictive fittings, and mounting
    • 1.G.4 Replace fuel filter; prime and bleed fuel system.
    • 1.G.5 Inspect high pressure fuel system components (fuel pump, pump drives, hoses, injection lines, filters, hold-downs, fittings, seals, and mounting hardware).
    • 1.G.6 Demonstrate knowledge and understanding of the different types of fuel systems.
    • 1.G.7 Perform fuel supply and return system tests; determine needed action.
    • 1.G.8 Perform cylinder contribution test using electronic service tool(s).
    • 1.G.9 Demonstrate knowledge of how to set performance parameters using electronic service tools and service information system access.
  • 1. Diesel Engines - 1.H Engine Brakes
    • 1.H.1 Inspect engine compression and/or exhaust brake housing, valves, seals, lines, and fittings; determine needed action.
    • 1.H.2 Inspect and adjust engine compression and/or exhaust brake systems; determine needed action.
    • 1.H.3 Inspect, test, and adjust engine compression and/or exhaust brake control circuits, switches, and solenoids; determine needed action.
  • 2. Drive Train - 2.A General
    • 2.A.1 Research vehicle service information including fluid type, vehicle service history, service precautions, and technical service bulletins.
    • 2.A.2 Identify drive train components, transmission type, and configuration.
    • 2.A.3 Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.
  • 2. Drive Train - 2.B Clutch
    • 2.B.1 Inspect and adjust clutch, clutch brake, linkage, cables, levers, brackets, bushings, pivots, springs, and clutch safety switch (includes push-type and pull-type); check pedal height and travel; determine needed action.
    • 2.B.2 Inspect clutch master cylinder fluid level; check clutch master cylinder, slave cylinder, lines, and hoses for leaks and damage; determine needed action.
    • 2.B.3 Inspect, adjust, repair, and/or replace hydraulic clutch slave and master cylinders, lines, and hoses; bleed system.
    • 2.B.4 Inspect, adjust, lubricate, or replace release (throw-out) bearing, sleeve, bushings, springs, housing, levers, release fork, fork pads, rollers, shafts, and seals.
    • 2.B.5 Inspect, adjust, and/or replace single-disc clutch pressure plate and clutch disc.
    • 2.B.6 Inspect, adjust, and/or replace two-plate clutch pressure plate, clutch discs, intermediate plate, and drive pins/lugs.
    • 2.B.7 Inspect and/or replace clutch brake assembly; inspect input shaft and bearing retainer; determine needed action.
    • 2.B.8 Inspect, adjust, and/or replace self-adjusting/continuous-adjusting clutch mechanisms.
    • 2.B.9 Inspect and/or replace pilot bearing.
    • 2.B.10 Identify causes of clutch noise, binding, slippage, pulsation, vibration, grabbing, dragging, and chatter problems; determine needed action.
    • 2.B.11 Remove and install flywheel; inspect mounting area on crankshaft; inspect rear main oil seal; measure crankshaft end play; determine needed action.
    • 2.B.12 Inspect flywheel and starter ring gear; measure flywheel face; measure pilot bore runout; determine needed action.
    • 2.B.13 Inspect flywheel housing-to-transmission housing/engine mating surface(s); measure flywheel housing face and bore runout; determine needed action.
  • 2. Drive Train - 2.C Transmission
    • 2.C.1 Inspect transmission shifter and linkage; inspect and/or replace transmission mounts, insulators, and mounting bolts.
    • 2.C.2 Inspect transmission for leakage; determine needed action.
    • 2.C.3 Replace transmission cover plates, gaskets, seals, and cap bolts; inspect seal surfaces and vents; determine needed action.
    • 2.C.4 Check transmission fluid level and condition; determine needed action.
    • 2.C.5 Inspect transmission breather; inspect transmission oil filters, coolers, and related components; determine needed action.
    • 2.C.6 Inspect speedometer components; determine needed action.
    • 2.C.7 Inspect and test function of REVERSE light, NEUTRAL start, and warning device circuits; determine needed action.
    • 2.C.8 Inspect, adjust, and replace transmission covers, rails, forks, levers, bushings, sleeves, detents, interlocks, springs, and lock bolts/safety wires.
    • 2.C.9 Identify causes of transmission noise, shifting concerns, lockup, jumping out-of-gear, overheating, and vibration problems; determine needed repairs.
    • 2.C.10 Inspect, test, repair, and/or replace air shift controls, lines, hoses, valves, regulators, filters, and cylinder assemblies.
    • 2.C.11 Remove and reinstall transmission.
    • 2.C.12 Inspect input shaft, gear, spacers, bearings, retainers, and slingers; determine needed action.
    • 2.C.13 Inspect and adjust power take-off (PTO) assemblies, controls, and shafts; determine needed action.
    • 2.C.14 Inspect and test transmission temperature gauge, wiring harnesses, and sensor/sending unit; determine needed action.
    • 2.C.15 Inspect and test operation of automatic transmission, components, and controls; diagnose automatic transmission system problems; determine needed action.
    • 2.E.16 Measure and adjust drive pinion bearing preload.
    • 2.E.17 Measure and adjust drive pinion depth.
    • 2.E.18 Measure and adjust side bearing preload and ring gear backlash.
    • 2.E.19 Check and interpret ring gear and pinion tooth contact pattern; determine needed action.
    • 2.E.20 Inspect, adjust, or replace ring gear thrust block/screw.
  • 3. Brakes - 3.A General
    • 3.A.1 Research vehicle service information, including fluid type, vehicle service history, service precautions, and technical service bulletins.
    • 3.A.2 Identify brake system components and configurations (including air and hydraulic systems, parking brake, power assist, and vehicle dynamic brake systems).
    • 3.A.3 Identify brake performance problems caused by the mechanical/foundation brake system (air and hydraulic).
    • 3.A.4 Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.
  • 3. Brakes - 3.B Air Brakes: Air Supply and Service Systems
    • 3.B.1 Inspect, test, repair, and/or replace air supply system components such as compressor, governor, air drier, tanks, and lines; inspect service system components such as lines, fittings, mountings, and valves (hand brake/trailer control, brake relay,
    • 3.B.2 Test gauge operation and readings; test low pressure warning alarm operation; perform air supply system tests such as pressure build-up, governor settings, and leakage; drain air tanks and check for contamination; determine needed action.
    • 3.B.3 Demonstrate knowledge and understanding of air supply and service system components and operations.
    • 3.B.4 Inspect air compressor drive gear components (gears, belts, tensioners, and/or couplings); determine needed action.
    • 3.B.5 Inspect air compressor inlet; inspect oil supply and coolant lines, fittings, and mounting brackets; repair or replace as needed.
    • 3.B.6 Inspect and test air tank relief (safety) valves, one-way (single) check valves, two-way (double) check valves, manual and automatic drain valves; determine needed action.
    • 3.B.7 Inspect and clean air drier systems, filters, valves, heaters, wiring, and connectors; determine needed action.
    • 3.B.8 Inspect and test brake application (foot/treadle) valve, fittings, and mounts; check pedal operation; determine needed action.
  • 3. Brakes - 3.C Air Brakes: Mechanical / Foundational Brake System
    • 3.C.1 Inspect, test, repair, and/or replace service brake chambers, diaphragms, clamps, springs, pushrods, clevises, and mounting brackets; determine needed action.
    • 3.C.2 Identify slack adjuster type; inspect slack adjusters; perform needed action.
    • 3.C.3 Check camshafts (S-cam), tubes, rollers, bushings, seals, spacers, retainers, brake spiders, shields, anchor pins, and springs; perform needed action.
    • 3.C.4 Inspect rotor and mounting surface; measure rotor thickness, thickness variation, and lateral runout; determine needed action.
    • 3.C.5 Inspect, clean, and adjust air disc brake caliper assemblies; inspect and measure disc brake pads; inspect mounting hardware; perform needed action.
    • 3.C.6 Remove brake drum; clean and inspect brake drum and mounting surface; measure brake drum diameter; measure brake lining thickness; inspect brake lining condition; determine needed action.
    • 3.C.7 Diagnose concerns related to the mechanical/foundation brake system including poor stopping, brake noise, premature wear, pulling, grabbing, or dragging; determine needed action.
  • 3. Brakes - 3.D Air Brakes: Parking Brake System
    • 3.D.1 Inspect, test, and/or replace parking (spring) brake chamber.
    • 3.D.2 Inspect, test, and/or replace parking (spring) brake check valves, lines, hoses, and fittings.
    • 3.D.3 Inspect, test, and/or replace parking (spring) brake application and release valve.
    • 3.D.4 Manually release (cage) and reset (uncage) parking (spring) brakes.
    • 3.D.5 Identify and test anti-compounding brake function; determine needed action.
  • 3. Brakes - 3.E Vehicle Dynamic Brake Systems (Air and Hydraulic): Antilock Brake System (ABS), Automatic Traction Control (ATC) System, and Electronic Stability Control (ESC) System
    • 3.E.1 Observe antilock brake system (ABS) warning light operation including trailer and dash mounted trailer ABS warning light; determine needed action.
    • 3.E.2 Observe automatic traction control (ATC) and electronic stability control (ETC) warning light operation; determine needed action.
    • 3.E.3 Identify stopping concerns related to the vehicle dynamic brake systems: ABS, ATC, and ESC; determine needed action.
    • 3.E.4 Diagnose problems in the vehicle dynamic brake control systems; determine needed action.
    • 3.E.5 Check and test operation of vehicle dynamic brake system (air and hydraulic) mechanical and electrical components; determine needed action.
    • 3.E.6 Test vehicle/wheel speed sensors and circuits; adjust, repair, and/or replace as needed.
    • 3.E.7 Bleed ABS hydraulic circuits.
    • 3.E.8 Verify power line carrier (PLC) operation.
  • 3. Brakes - 3.F Wheel Bearings
    • 3.F.1 Clean, inspect, lubricate, and/or replace wheel bearings and races/cups; replace seals and wear rings; inspect spindle/tube; inspect and replace retaining hardware; adjust wheel bearings; check hub assembly fluid level and condition; verify end play
    • 3.F.2 Identify, inspect, and/or replace unitized/preset hub bearing assemblies.
  • 4. Suspension And Steering Systems - 4.A General
    • 4.A.1 Research vehicle service information, including fluid type, vehicle service history, service precautions, and technical service bulletins.
    • 4.A.2 Disable and enable supplemental restraint system (SRS); verify indicator lamp operation.
    • 4.A.3 Identify suspension and steering system components and configurations.
    • 4.A.4 Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.
  • 4. Suspension And Steering Systems - 4.B Steering Column
    • 4.B.1 Check steering wheel for free play, binding, and proper centering; inspect and service steering shaft U-joint(s), slip joint(s), bearings, bushings, and seals; phase steering shaft.
    • 4.B.2 Diagnose causes of fixed and driver adjustable steering column and shaft noise, looseness, and binding problems.
    • 4.B.3 Check cab mounting and adjust cab ride height.
    • 4.B.4 Remove the steering wheel (includes steering wheels equipped with electrical/electronic controls and components); install and center the steering wheel.
    • 4.B.5 Inspect, test, replace, and calibrate steering angle sensor.
  • 4. Suspension And Steering Systems - 4.C Steering Pump and Gear Units
    • 4.C.1 Check power steering pump and gear operation, mountings, lines, and hoses; check fluid level and condition; service filter; inspect system for leaks.
    • 4.C.2 Flush and refill power steering system; purge air from system.
    • 4.C.3 Diagnose causes of power steering system noise, binding, darting/oversteer, reduced wheel cut, steering wheel kick, pulling, non-recovery, turning effort, looseness, hard steering, overheating, fluid leakage, and fluid aeration problems.
    • 4.C.4 Inspect, service, and/or replace power steering reservoir, seals, and gaskets.
    • 4.C.5 Inspect and/or replace power steering system cooler, lines, hoses, clamps, mountings, and fittings.
    • 4.C.6 Inspect and/or replace power steering gear(s) (single and/or dual) and mountings.
  • 4. Suspension And Steering Systems - 4.D Steering Linkage
    • 4.D.1 Inspect, service, repair, and/or replace tie rod ends, ball joints, kingpins, pitman arms, idler arms, and other steering linkage components.
  • 4. Suspension And Steering Systems - 4.E Suspension Systems
    • 4.E.1 Inspect, service, repair, and/or replace shock absorbers, bushings, brackets, and mounts.
    • 4.E.2 Inspect, repair, and/or replace leaf springs, center bolts, clips, pins, bushings, shackles, U-bolts, insulators, brackets, and mounts.
    • 4.E.3 Inspect, repair, and/or replace axle and axle aligning devices such as: radius rods, track bars, stabilizer bars, and torque arms; inspect related bushings, mounts, shims and attaching hardware; determine needed action.
    • 4.E.4 Inspect, repair, and/or replace tandem suspension equalizer components; determine needed action.
    • 4.E.5 Inspect, repair, and/or replace air springs, mounting plates, springs, suspension arms, and bushings.
    • 4.E.6 Inspect, test, repair, and/or replace air suspension pressure regulator and height control valves, lines, hoses, dump valves, and fittings; check and record ride height.
    • 4.E.7 Inspect and service kingpins, steering knuckle bushings, locks, bearings, seals, and covers.
    • 4.E.8 Measure, record and adjust ride height; determine needed action.
    • 4.E.9 Diagnose rough ride problems; determine needed action.
  • 4. Suspension And Steering Systems - 4.F Wheel Alignment Diagnosis and Repair
    • 4.F.1 Demonstrate understanding of alignment angles.
    • 4.F.2 Diagnose causes of vehicle wandering, pulling, shimmy, hard steering, and off-center steering wheel problems.
    • 4.F.3 Check, record, and adjust camber.
    • 4.F.4 Check, record, and adjust caster.
    • 4.F.5 Check, record, and adjust toe settings.
    • 4.F.6 Check rear axle(s) alignment (thrustline/centerline) and tracking.
    • 4.F.7 Identify turning/Ackerman angle (toe-out-on-turns) problems.
    • 4.F.8 Check front axle alignment (centerline).
  • 4. Suspension And Steering Systems - 4.G Wheels and Tires
    • 4.G.1 Inspect tire condition; identify tire wear patterns; measure tread depth; verify tire matching (diameter and tread); inspect valve stem and cap; set tire pressure; determine needed action.
    • 4.G.2 Diagnose wheel/tire vibration, shimmy, pounding, and hop (tramp) problems; determine needed action.
    • 4.G.3 Check wheel mounting hardware; check wheel condition; remove and install wheel/tire assemblies (steering and drive axle); torque fasteners to manufacturer's specification using torque wrench.
    • 4.G.4 Inspect tire and wheel for proper application (size, load range, position, and tread design); determine needed action.
  • 4. Suspension And Steering Systems - 4.H Frame and Coupling Devices
    • 4.H.1 Inspect, service, and/or adjust fifth wheel, pivot pins, bushings, locking mechanisms, mounting hardware, air lines, and fittings.
    • 4.H.2 Inspect frame and frame members for cracks, breaks, corrosion, distortion, elongated holes, looseness, and damage; determine needed action.
    • 4.H.3 Inspect, install, and/or replace frame hangers, brackets, and cross members; determine needed action.
    • 4.H.4 Inspect, repair, or replace pintle hooks and draw bars (if applicable).
    • 4.H.5 Inspect, service, and/or adjust sliding fifth wheel, tracks, stops, locking systems, air cylinders, springs, lines, hoses, and controls.
  • 5. Electrical/Electronic Systems - 5.A General
    • 5.A.1 Research vehicle service information, including vehicle service history, service precautions, and technical service bulletins.
    • 5.A.2 Demonstrate knowledge of electrical/electronic series, parallel, and series-parallel circuits using principles of electricity (Ohm's Law).
    • 5.A.3 Demonstrate proper use of test equipment when measuring source voltage, voltage drop (including grounds), current flow, continuity, and resistance.
    • 5.A.4 Demonstrate knowledge of the causes and effects of shorts, grounds, opens, and resistance problems in electrical/electronic circuits; identify and locate faults in electrical/electronic circuits.
    • 5.A.5 Use wiring diagrams during the diagnosis (troubleshooting) of electrical/electronic circuit problems.
    • 5.A.6 Measure parasitic (key-off) battery drain; determine needed action.
    • 5.A.7 Demonstrate knowledge of the function, operation, and testing of fusible links, circuit breakers, relays, solenoids, diodes, and fuses; perform inspection and testing; determine needed action.
    • 5.A.9 Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.
    • 5.A.10 Diagnose faults in the data bus communications network; determine needed action.
    • 5.A.11 Identify electrical/electronic system components and configuration.
    • 5.A.12 Check frequency, pulse width, and waveforms of electrical/electronic signals using appropriate test equipment; interpret readings; determine needed repairs.
    • 5.A.13 Understand the process for software transfer, software updates, and/or reprogramming of electronic modules.
  • 5. Electrical/Electronic Systems - 5.B Battery System
    • 5.B.1 Identify battery type and system configuration.
    • 5.B.2 Confirm proper battery capacity for application; perform battery state-of-charge test; perform battery capacity test, determine needed action.
    • 5.B.3 Inspect battery, battery cables, connectors, battery boxes, mounts, and hold-downs; determine needed action.
    • 5.B.4 Charge battery using appropriate method for battery type.
    • 5.B.5 Jump-start vehicle using a booster battery and jumper cables or using an appropriate auxiliary power supply.
    • 5.B.6 Check low voltage disconnect (LVD) systems; determine needed action.
    • 5.B.7 Inspect, clean, and service battery; replace as needed.
    • 5.B.8 Inspect and clean battery boxes, mounts, and hold-downs; repair or replace as needed.
    • 5.B.9 Test, and clean battery cables and connectors; repair or replace as needed.
    • 5.B.10 Identify electrical/electronic modules, radios, and other accessories that require reinitialization or code entry after reconnecting vehicle battery.
  • 5. Electrical/Electronic Systems - 5.C Starting System
    • 5.C.1 Demonstrate understanding of starter system operation.
    • 5.C.2 Perform starter circuit cranking voltage and voltage drop tests; determine needed action.
    • 5.C.3 Inspect and test starter control circuit switches (key switch, push button, and/or magnetic switch), relays, connectors, terminals, wires, and harnesses (including over-crank protection); determine needed action.
    • 5.C.4 Diagnose causes of no-crank or slow crank condition; differentiate between electrical and engine mechanical problems; determine needed action.
    • 5.C.5 Perform starter current draw tests; determine needed action.
    • 5.C.6 Remove and replace starter; inspect flywheel ring gear or flex plate.
  • 5. Electrical/Electronic Systems - 5.D Charging System
    • 5.D.1 Identify and understand operation of the generator (alternator).
    • 5.D.2 Test instrument panel mounted voltmeters and/or indicator lamps; determine needed action.
    • 5.D.3 Inspect, adjust, and/or replace generator (alternator) drive belt; check pulleys and tensioners for wear; check fans and mounting brackets; verify proper belt alignment; determine needed action.
    • 5.D.4 Inspect cables, wires, and connectors in the charging circuit.
    • 5.D.5 Perform charging system voltage and amperage output tests; perform AC ripple test; determine needed action.
    • 5.D.6 Perform charging circuit voltage drop tests; determine needed action.
    • 5.D.7 Remove, inspect, and/or replace generator (alternator).
  • 5. Electrical/Electronic Systems - 5.E Lighting Systems
    • 5.E.1 Diagnose causes of brighter-than-normal, intermittent, dim, or no-light operation; determine needed action.
    • 5.E.2 Test, replace, and aim headlights.
    • 5.E.3 Inspect cables, wires, and connectors in the lighting systems.
    • 5.E.4 Diagnose faults in tractor-to-trailer multi-wire connector(s), cables, and holders; determine needed action.
    • 5.E.5 Diagnose faults in switches, relays, bulbs/LEDs, wires, terminals, connectors, sockets, and control components/modules of exterior lighting systems; determine needed action.
    • 5.E.6 Diagnose faults in switches, relays, bulbs/LEDs, wires, terminals, connectors, sockets, and control components/modules of interior lighting systems; determine needed action.
    • 5.E.7  Diagnose faults in switches, relays, bulbs/LEDs, wires, terminals, connectors, sockets, and control components/modules of auxiliary lighting circuits; determine needed action.
  • 5. Electrical/Electronic Systems - 5.F Instrument Cluster and Driver Information Systems
    • 5.F.1 Check gauge and warning indicator operation.
    • 5.F.2 Diagnose faults in the sensor/sending units, gauges, switches, relays, bulbs/LEDs, wires, terminals, connectors, sockets, printed circuits, and control components/modules of the instrument cluster, driver information systems, and warning systems; de
    • 5.F.3 Inspect, test, replace, and calibrate (if applicable) electronic speedometer, odometer, and tachometer systems.
  • 5. Electrical/Electronic Systems - 5.G Cab and Chassis Electrical Systems
    • 5.G.1 Diagnose operation of horn(s), wiper/washer, and occupant restraint systems.
    • 5.G.2 Describe operation of safety systems and related circuits (such as: speed control, collision avoidance, lane departure, and camera systems).
    • 5.G.3 Describe operation of comfort and convenience systems and related circuits (such as: power windows, power seats, power locks, remote keyless entry, steering wheel controls, and cruise control).
    • 5.G.4 Describe operation of entertainment systems and related circuits (such as: radio, DVD, navigation, speakers, antennas, and voice-activated accessories).
    • 5.G.5 Describe the operation of power inverter, protection devices, connectors, terminals, wiring, and control components/modules of auxiliary power systems.
    • 5.G.6 Describe operation of telematics systems.
    • 5.G.7 Diagnose faults in engine block and engine oil heater(s); determine needed action.
  • 6. Heating, Ventilation, and Air Conditioning (HVAC) - 6.A General
    • 6.A.1 Research vehicle service information, including refrigerant/oil type, vehicle service history, service precautions, and technical service bulletins.
    • 6.A.2 Identify heating, ventilation, and air conditioning (HVAC) components and configuration.
    • 6.A.3 Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.
    • 6.A.4 Diagnose heating and air conditioning problems; determine needed action.
    • 6.A.5 Identify refrigerant type; test for contamination; select and connect proper gauge set/test equipment; record temperature and pressure readings.
    • 6.A.6 Perform A/C system performance test; determine needed action.
    • 6.A.7 Perform A/C system leak test; determine needed action.
    • 6.A.8 Inspect condition of refrigerant oil removed from A/C system; determine needed action.
    • 6.A.9 Determine oil and oil capacity for system application and/or component replacement.
  • 6. Heating, Ventilation, and Air Conditioning (HVAC) - 6.B Refrigeration System Components
    • 6.B.1 Inspect, remove, and replace A/C compressor drive belts, pulleys, and tensioners; verify proper belt alignment.
    • 6.B.2 Check A/C system operation including system pressures; visually inspect A/C components for signs of leaks; check A/C monitoring system (if applicable).
    • 6.B.3 Inspect A/C condenser for airflow restrictions; determine needed action.
    • 6.B.4 Inspect, test, service, and/or replace A/C compressor and clutch assembly; check compressor clutch air gap; determine needed action.
    • 6.B.5 Inspect, service, and/or replace A/C system hoses, lines, fittings, O-rings, seals, and service valves.
    • 6.B.6 Inspect, remove, and/or replace receiver/drier or accumulator/drier.
    • 6.B.7 Inspect, remove, and/or replace expansion valve or orifice (expansion tube.
    • 6.B.8 Inspect evaporator housing water drain; perform needed action.
    • 6.B.9 Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and/or control module) to interrupt system operation; determine needed action.
    • 6.B.10 Determine procedure to remove and reinstall evaporator.
    • 6.B.11 Determine procedure to inspect and/or replace condenser.
  • 6. Heating, Ventilation, and Air Conditioning (HVAC) - 6.C Heating, Ventilation, and Engine Cooling Systems
    • 6.C.1 Inspect engine cooling system and heater system hoses and pipes; determine needed action.
    • 6.C.2 Inspect HVAC system heater ducts, doors, hoses, cabin filters, and outlets; determine needed action.
    • 6.C.3 Identify the source of A/C system odors; determine needed action.
    • 6.C.4 Diagnose temperature control problems in the HVAC system; determine needed action.
    • 6.C.5 Determine procedure to remove, inspect, reinstall, and/or replace engine coolant and heater system components.
  • 6. Heating, Ventilation, and Air Conditioning (HVAC) - 6.D Operating Systems and Related Controls
    • 6.D.1 Verify HVAC system blower motor operation; confirm proper air distribution; confirm proper temperature control; determine needed action.
    • 6.D.2 Inspect and test HVAC system blower motors, resistors, switches, relays, wiring, and protection devices; determine needed action.
    • 6.D.3 Diagnose A/C compressor clutch control systems; determine needed action.
    • 6.D.4 Diagnose malfunctions in the vacuum, mechanical, and electrical components, and controls of the HVAC system; determine needed action.
  • 6. Heating, Ventilation, and Air Conditioning (HVAC) - 6.E Refrigerant Recovery, Recycling, and Handling
    • 6.E.1 Understand correct use and maintenance of refrigerant handling equipment.
    • 6.E.2 Understand how to identify A/C system refrigerant; test for sealants; recover, evacuate, and charge A/C system; add refrigerant oil as required.
    • 6.E.3 Understand how to recycle, label, and store refrigerant.
  • 7. Cab - 7.A General
    • 7.A.1 Research vehicle service information, including vehicle service history, service precautions, and technical service bulletins.
    • 7.A.2 Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; check and record trip/operational data; reset maintenance monitor (if applicable); interpret digital multimeter (DMM) readings
    • 7.A.A Instruments and Controls - 7.A.1A Inspect mechanical key condition; check operation of ignition switch; check operation of indicator lights, warning lights and/or alarms; check instruments; record oil pressure and system voltage; check operation of
    • 7.A.A Instruments and Controls - 7.A.2A Check operation of all accessories.
    • 7.A.A Instruments and Controls - 7.A.3A Understand operation of auxiliary power unit (APU)/electric power unit (EPU).
  • 7. Cab - 7.B Safety Equipment
    • 7.B.1 Test operation of horns (electric and air); test warning device operation (reverse, air pressure, etc.); check condition of spare fuses, safety triangles, fire extinguisher, and all required decals; inspect seat belts and sleeper restraints; inspect
  • 7. Cab - 7.C Hardware
    • 7.C.1 Test operation of wipers and washer; inspect windshield glass for cracks or discoloration; check sun visor; check seat condition, operation, and mounting; check door glass and window operation; verify operation of door and cab locks; inspect steps a
    • 7.C.2 Record all physical damage.
    • 7.C.3 Lubricate all cab grease fittings; inspect and lubricate door and hood hinges, latches, strikers, lock cylinders, safety latches, linkages, and cables.
    • 7.C.4 Inspect cab mountings, hinges, latches, linkages, and ride height; determine needed action.
    • 7.C.5 Inspect quarter fender, mud flaps, and brackets; determine needed action.
  • 8. Hydraulics - 8.A General
    • 8.A.1 Research vehicle service information, including vehicle service history, service precautions, fluid type, and technical service bulletins.
    • 8.A.2 Verify placement of equipment/component safety labels and placards; determine needed action.
    • 8.A.3 Identify hydraulic system components; locate filtration system components; service filters and breathers.
    • 8.A.4 Check fluid level and condition; purge and/or bleed system; take a hydraulic fluid sample for analysis; determine needed action.
    • 8.A.5 Inspect hoses and connections for leaks, proper routing, and proper protection; determine needed action.
    • 8.A.6 Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.
    • 8.A.7 Read and interpret system diagrams and schematics.
    • 8.A.8 Perform system temperature, pressure, flow, and cycle time tests; determine needed action.
  • 8. Hydraulics - 8.B Pumps
    • 8.B.1 Identify causes of pump failure, unusual pump noises, temperature, flow and leakage problems; determine needed action.
    • 8.B.2 Determine pump type, rotation, and drive system.
    • 8.B.3 Remove and install pump; prime and/or bleed system.
    • 8.B.4 Inspect pump inlet and outlet for restrictions and leaks; determine needed action.
  • 8. Hydraulics - 8.C Filtration / Reservoirs (Tanks)
    • 8.C.1 Identify type of filtration system; verify filter application and flow direction.
    • 8.C.2 Service filters and breathers.
    • 8.C.3 Identify causes of system contamination; determine needed action.
    • 8.C.4 Inspect, repair, and/or replace reservoir, sight glass, vents, caps, mounts, valves, screens, supply, and return lines.
  • 8. Hydraulics - 8.D Hoses, Fittings, and Connections
    • 8.D.1 Diagnose causes of component leakage, damage, and restriction; determine needed action.
    • 8.D.2 Inspect hoses and connections for leaks, proper routing, and proper protection; determine needed action.
    • 8.D.3 Assemble hoses, tubes, connectors, and fittings.
  • 8. Hydraulics - 8.E Control Valves
    • 8.E.1 Pressure test system safety relief valve; determine needed action.
    • 8.E.2 Perform control valve operation pressure and flow tests; determine needed action.
    • 8.E.3 Inspect, test, and adjust valve controls (electrical/electronic, mechanical, and pneumatic).
    • 8.E.4 Identify causes of control valve leakage problems (internal and external); determine needed action.
    • 8.E.5 Inspect pilot control valve linkages, cables, and PTO controls; adjust, repair, or replace as needed.
  • 8. Hydraulics - 8.F Actuators
    • 8.F.1 Identify actuator type (single-acting, double-acting, multi-stage, telescopic, and motor).
    • 8.F.2 Identify the cause of seal failure; determine needed action.
    • 8.F.3 Identify the cause of incorrect actuator movement and/or leakage (internal and external); determine needed action.
    • 8.F.4 Inspect actuator mounting, frame components, and hardware for looseness, cracks, and damage; determine needed action.
    • 8.F.5 Remove, repair, and/or replace actuators.
    • 8.F.6 Inspect actuators for dents, cracks, damage, and leakage; determine needed action.
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