Diesel Technician
Competency-based
ONET: 49-3031.00
266
Skills
163h
Related instructions
Classroom instruction topics
- General: Foundation, Basics
- Steering and Suspension
- Brakes
- Drive Train
- CAB: PM and PDI
- CAB: International Trucks
- CAB: Bus
- HVAC
- Electrical/Electronics: Bus
- Electrical/Electronics: Diamond Logic Builder
- Electrical. Vehicle
- Diesel Engine: Heavy Duty Engine
- Diesel Engine: Cummins
On-the-job training
- R.S.T. Shop and Personal Safety
- Identify general shop safety rules and procedures.
- Utilize safe procedures for handling of tools and equipment.
- Identify and use proper placement of floor jacks and jack stands.
- Identify and use proper procedures for safe lift operation.
- Utilize proper ventilation procedures for working within the lab/shop area.
- Identify marked safety areas.
- 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.
- Identify the location and use of eye wash stations.
- Identify the location of the posted evacuation routes.
- Comply with the required use of safety glasses, ear protection, gloves, and shoes during lab/shop activities.
- Identify and wear appropriate clothing for lab/shop activities.
- Secure hair and jewelry for lab/shop activities.
- Demonstrate awareness of the safety aspects of supplemental restraint systems (SRS), electronic brake control systems, and hybrid vehicle high voltage circuits.
- Demonstrate awareness of the safety aspects of high voltage circuits (such as high intensity discharge (HID) lamps, ignition systems, injection systems, etc.).
- Locate and demonstrate knowledge of material safety data sheets (MSDS).
- Diesel Engines - General
- Research vehicle service information, including fluid type, vehicle service history, service precautions, and technical service bulletins.
- Inspect level and condition of fuel, oil, diesel exhaust fluid (DEF), and coolant.
- Inspect engine assembly for fuel, oil, coolant, air, and other leaks; determine needed action.
- Diagnose engine operation (starting and running) including: noise, vibration, smoke, etc.; determine needed action.
- Use appropriate electronic service tool(s) and procedures to diagnose
- 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.
- Diagnose engine no-crank, cranks but fails to start, hard starting, and starts but does not continue to run problems; determine needed action.
- Diagnose engine surging, rough operation, misfiring, low power, slow deceleration, slow acceleration, and/or shut down problems; determine needed action.
- Diesel Engines - Cylinder Head and Valve Train
- Inspect electronic wiring harness and brackets for wear, bending, cracks, and proper securement; determine needed action.
- Adjust valve bridges (crossheads); adjust valve clearances and injector settings.
- Diesel Engines - Engine Block
- Inspect crankshaft vibration damper; inspect engine mounts; determine needed action.
- Remove, inspect, service, and install pans, covers, gaskets, seals, wear rings, and crankcase ventilation components; determine needed action.
- Inspect flywheel/flex plate (including ring gear) and mounting surfaces for cracks and wear; measure runout; determine needed action.
- Diesel Engines - Lubrication Systems
- 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.
- Determine proper lubricant; perform oil and filter service.
- Inspect turbocharger lubrication systems; determine needed action.
- Inspect and measure oil pump, drives, inlet pipes, and pick-up screens; check drive gear clearances; determine needed action.
- Inspect oil pressure regulator valve(s), by-pass and pressure relief valve(s), oil thermostat, and filters; determine needed action.
- Diesel Engines - Cooling System
- Check engine coolant type, level, and condition; test coolant for freeze protection and additive package concentration.
- Test coolant temperature; test operation of temperature and level sensors, gauge, and/or sending unit; determine needed action.
- Inspect and reinstall/replace pulleys, tensioners and drive belts; adjust drive belts and check alignment.
- Recover coolant; flush and refill with recommended coolant/additive package; bleed cooling system.
- Inspect coolant conditioner/filter assembly for leaks; inspect valves, lines, and fittings; replace as needed.
- Inspect water pump, hoses, and clamps; determine needed action.
- Inspect and pressure test cooling system(s); pressure test cap, tank(s), and recovery systems; inspect radiator and mountings; determine needed action.
- Inspect, test, and repair thermostatic cooling fan system (hydraulic, pneumatic, and electronic) and fan shroud; determine needed action.
- Diagnose engine coolant consumption; determine needed action.
- Inspect thermostat(s), by-passes, housing(s), and seals; replace as needed.
- Diesel Engines - Air Induction and Exhaust Systems
- Inspect turbocharger(s), wastegate(s), and piping systems; determine needed action
- 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).
- 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.
- Inspect crankcase ventilation system; service as needed.
- Diagnose problems/faults in the exhaust gas recirculation (EGR) system including: EGR valve, cooler, piping, filter, electronic sensors, controls, and wiring; determine needed action.
- Perform air intake system restriction and leakage tests; determine needed action.
- Perform intake manifold pressure (boost) test; determine needed action.
- Check exhaust back pressure; determine needed action.
- Inspect variable ratio geometry turbocharger (VGT), controls, and actuators (pneumatic, hydraulic, and electronic); determine needed action.
- Demonstrate knowledge of charge air cooler operation and testing.
- Diagnose exhaust aftertreatment system performance problems; determine needed action.
- Diesel Engines - Fuel System
- Check fuel level and condition; determine needed action.
- Inspect fuel tanks, vents, caps, mounts, valves, screens, crossover system, hoses, lines, and fittings; determine needed action.
- 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 hardware); determine needed action.
- Replace fuel filter; prime and bleed fuel system.
- Inspect high pressure fuel system components (fuel pump, pump drives, hoses, injection lines, filters, hold-downs, fittings, seals, and mounting hardware).
- Demonstrate knowledge and understanding of the different types of fuel systems.
- Perform fuel supply and return system tests; determine needed action.
- Perform cylinder contribution test using electronic service tool(s).
- Demonstrate knowledge of how to set performance parameters using electronic service tools and service information system access.
- Diesel Engines - Engine Breaks
- Inspect exhaust brake housing, valves, seals, lines, and fittings; determine needed action.
- Drive Train - General
- Research vehicle service information including fluid type, vehicle service history, service precautions, and technical service bulletins.
- Identify drive train components, transmission type, and configuration.
- Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.
- Drive Train - Clutch
- 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.
- Inspect clutch master cylinder fluid level; check clutch master cylinder, slave cylinder, lines, and hoses for leaks and damage; determine needed action.
- Inspect, adjust, repair, and/or replace hydraulic clutch slave and master cylinders, lines, and hoses; bleed system.
- Inspect, adjust, and/or replace two-plate clutch pressure plate, clutch discs, intermediate plate, and drive pins/lugs.
- Inspect and/or replace clutch brake assembly; inspect input shaft and bearing retainer; determine needed action.
- Inspect, adjust, and/or replace self-adjusting/continuous-adjusting clutch mechanisms.
- Inspect and/or replace pilot bearing.
- Identify causes of clutch noise, binding, slippage, pulsation, vibration, grabbing, dragging, and chatter problems; determine needed action.
- Remove and install flywheel; inspect mounting area on crankshaft; inspect rear main oil seal; measure crankshaft end play; determine needed action.
- Inspect flywheel and starter ring gear; measure flywheel face; measure pilot bore runout; determine needed action.
- Drive Train - Transmission
- Inspect transmission shifter and linkage inspect and/or replace transmission mounts, insulators, and mounting bolts.
- Inspect transmission for leakage; determine needed action.
- Check transmission fluid level and condition; determine needed action.
- Inspect transmission breather, inspect transmission oil filters, coolers, and related components, determine needed action.
- Inspect speedometer components; determine needed action.
- Inspect and test function of REVERSE light, NEUTRAL start, and warning device circuits; determine needed action.
- Identify causes of transmission noise, shifting concerns, lockup, jumping out-of-gear, overheating, and vibration problems; determine needed action.
- Remove and reinstall transmission.
- Inspect input shaft, gear, spacers, bearings, retainers, and slingers; determine needed action.
- Inspect and adjust power take-off (PTO) assemblies, controls, and shafts; determine needed action.
- Inspect and test operation of automatic transmission, components, and controls; diagnose automatic transmission system problems; determine needed action.
- Inspect and test operation of automated mechanical transmission, components, and controls; diagnose automated mechanical transmission system problems; determine needed action.
- Drive Train - Driveshaft and Universal Joints
- Inspect, service, and/or replace driveshafts, slip joints, yokes, drive flanges, support bearings, universal joints, boots, seals, and retaining/mounting hardware; check phasing of all shafts.
- Identify causes of driveshaft and universal joint noise and vibration problems; determine needed action.
- Inspect driveshaft center support bearings and mounts; determine needed action.
- Measure driveline angles; determine needed action.
- Drive Train - Drive Axles
- Check and repair fluid leaks; inspect drive axle housing assembly, cover plates, gaskets, seals, vent/breather, and magnetic plugs.
- Inspect drive axle shafts; determine needed action.
- Remove and replace wheel assembly; check rear wheel seal and axle flange for leaks; determine needed action.
- Identify causes of drive axle(s) drive unit noise and overheating problems; determine needed action.
- Inspect and test drive axle temperature gauge, wiring harnesses, and sending unit/sensor; determine needed action.
- Remove and replace differential carrier assembly.
- Identify causes of drive axle wheel bearing noise and check for damage; determine needed action.
- Inspect and/or replace components of differential case assembly including spider gears, cross shaft, side gears, thrust washers, case halves, and bearings.
- Inspect differential carrier housing and caps, side bearing bores, and pilot (spigot, pocket) bearing bore; determine needed action.
- Inspect and replace ring and drive pinion gears, spacers, sleeves, bearing cages, and bearings.
- Measure ring gear runout; determine needed action.
- Measure and adjust drive pinion bearing preload.
- Measure and adjust drive pinion depth.
- Measure and adjust side bearing preload and ring gear backlash.
- Check and interpret ring gear and pinion tooth contact pattern; determine needed action.
- Inspect, adjust, or replace ring gear thrust block/screw.
- Brakes - General
- Research vehicle service information, including fluid type, vehicle service history, service precautions, and technical service bulletins.
- Identify brake system components and configurations (including air and hydraulic systems, parking brake, power assist, and vehicle dynamic brake systems).
- Identify brake performance problems caused by the mechanical/foundation brake system (air and hydraulic).
- Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.
- Brakes - Air Brakes: Air Supply and Service Systems
- 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, quick release, tractor protection, emergency/spring brake control/modulator, pressure relief/safety); determine needed action.
- 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.
- Demonstrate knowledge and understanding of air supply and service system components and operations.
- Inspect air compressor drive gear components (gears, belts, tensioners, and/or couplings); determine needed action.
- Inspect air compressor inlet; inspect oil supply and coolant lines, fittings, and mounting brackets; repair or replace as needed.
- 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.
- Inspect and test brake application (foot/treadle) valve, fittings, and mounts; check pedal operation; determine needed action.
- Brakes - Air Brakes: Mechanical / Foundational Brake System
- Inspect, test, repair, and/or replace service brake chambers, diaphragms, clamps, springs, pushrods, clevises, and mounting brackets; determine needed action.
- Identify slack adjuster type; inspect slack adjusters; perform needed action.
- Check camshafts (S-cam), tubes, rollers, bushings, seals, spacers, retainers, brake spiders, shields, anchor pins, and springs; perform needed action.
- Inspect rotor and mounting surface; measure rotor thickness, thickness variation, and lateral runout; determine needed action.
- Inspect, clean, and adjust air disc brake caliper assemblies; inspect and measure disc brake pads; inspect mounting hardware; perform needed action.
- 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.
- Diagnose concerns related to the mechanical/foundation brake system including poor stopping, brake noise, premature wear, pulling, grabbing, or dragging; determine needed action.
- Brakes - Air Brakes: Parking Brake System
- Inspect, test, and/or replace parking (spring) brake chamber.
- Manually release (cage) and reset (uncage) parking (spring) brakes.
- Brakes - Vehicle Dynamic Brake Systems (Air and Hydraulic): Antilock Brake System (ABS), Automatic Traction Control (ATC) System, and Electronic Stability Control (ESC) System
- Observe antilock brake system (ABS) warning light operation including trailer and dash mounted trailer ABS warning light; determine needed action.
- Observe automatic traction control (ATC) and electronic stability control (ETC) warning light operation; determine needed action.
- Identify stopping concerns related to the vehicle dynamic brake systems: ABS, ATC, and ESC; determine needed action.
- Diagnose problems in the vehicle dynamic brake control systems; determine needed action.
- Check and test operation of vehicle dynamic brake system (air and hydraulic) mechanical and electrical components; determine needed action.
- Test vehicle/wheel speed sensors and circuits; adjust, repair, and/or replace as needed.
- Bleed ABS hydraulic circuits.
- Verify power line carrier (PLC) operation.
- Brakes - Wheel Bearings
- 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 with dial indicator method.
- Identify, inspect, and/or replace unitized/preset hub bearing assemblies.
- Suspension and Steering Systems - General
- Research vehicle service information, including fluid type, vehicle service history, service precautions, and technical service bulletins.
- Identify suspension and steering system components and configurations.
- Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.
- Suspension and Steering Systems - Steering Column
- 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.
- Diagnose causes of fixed and driver adjustable steering column and shaft noise, looseness, and binding problems.
- Check cab mounting and adjust cab ride height.
- Remove the steering wheel (includes steering wheels equipped with electrical/electronic controls and components); install and center the steering wheel.
- Inspect, test, replace, and calibrate steering angle sensor.
- Suspension and Steering Systems - Steering Pump and Gear Units
- Check power steering pump and gear operation, mountings, lines, and hoses; check fluid level and condition; service filter; inspect system for leaks.
- Flush and refill power steering system; purge air from system.
- 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.
- Inspect, service, and/or replace power steering reservoir, seals, and gaskets.
- Inspect and/or replace power steering system cooler, lines, hoses, clamps, mountings, and fittings.
- Inspect and/or replace power steering gear(s) (single and/or dual) and mountings.
- Suspension and Steering Systems - Steering Linkage
- Inspect, service, repair, and/or replace tie rod ends, ball joints, kingpins, pitman arms, idler arms, and other steering linkage components
- Suspension and Steering Systems - Suspension Systems
- Inspect, service, repair, and/or replace shock absorbers, bushings, brackets, and mounts.
- Inspect, repair, and/or replace leaf springs, center bolts, clips, pins, bushings, shackles, U-bolts, insulators, brackets, and mounts.
- 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.
- Inspect, repair, and/or replace air springs, mounting plates, springs, suspension arms, and bushings.
- 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.
- Inspect and service kingpins, steering knuckle bushings, locks, bearings, seals, and covers.
- Measure, record and adjust ride height; determine needed action.
- Diagnose rough ride problems; determine needed action.
- Suspension and Steering Systems - Wheel Alignment Diagnosis and Repair
- Demonstrate understanding of alignment angles.
- Diagnose causes of vehicle wandering, pulling, shimmy, hard steering, and off-center steering wheel problems.
- Check, record, and adjust camber.
- Check, record, and adjust caster.
- Check, record, and adjust toe settings.
- Check rear axle(s) alignment (thrustline/centerline) and tracking.
- Identify turning/Ackerman angle (toe-out-on-turns) problems.
- Check front axle alignment (centerline).
- Suspension and Steering Systems - Wheels and Tires
- 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.
- Diagnose wheel/tire vibration, shimmy, pounding, and hop (tramp) problems; determine needed action.
- 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.
- Inspect tire and wheel for proper application (size, load range, position, and tread design); determine needed action.
- Suspension and Steering Systems - Frame and Coupling Devices
- Inspect, service, and/or adjust fifth wheel, pivot pins, bushings, locking mechanisms, mounting hardware, air lines, and fittings.
- Inspect frame and frame members for cracks, breaks, corrosion, distortion, elongated holes, looseness, and damage; determine needed action.
- Inspect, install, and/or replace frame hangers, brackets, and cross members; determine needed action.
- Inspect, repair, or replace pintle hooks and draw bars (if applicable).
- Inspect, service, and/or adjust sliding fifth wheel, tracks, stops, locking systems, air cylinders, springs, lines, hoses, and controls.
- Electrical / Electronic Systems - General
- Research vehicle service information, including vehicle service history, service precautions, and technical service bulletins.
- Demonstrate knowledge of electrical/electronic series, parallel, and series-parallel circuits using principles of electricity (Ohm’s Law).
- Demonstrate proper use of test equipment when measuring source voltage, voltage drop (including grounds), current flow, continuity, and resistance.
- 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.
- Use wiring diagrams during the diagnosis (troubleshooting) of electrical/electronic circuit problems.
- 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.
- Inspect, test, repair (including solder repair), and/or replace components, connectors, seals, terminal ends, harnesses, and wiring; verify proper routing and securement; determine needed action.
- Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.
- Diagnose faults in the data bus communications network; determine needed action.
- Identify electrical/electronic system components and configuration.
- Understand the process for software transfer, software updates, and/or reprogramming of electronic modules.
- Electrical / Electronic Systems - Battery System
- Identify battery type and system configuration.
- Confirm proper battery capacity for application; perform battery state-of- charge test; perform battery capacity test, determine needed action.
- Inspect battery, battery cables, connectors, battery boxes, mounts, and hold-downs; determine needed action.
- Charge battery using appropriate method for battery type.
- Jump-start vehicle using a booster battery and jumper cables or using an appropriate auxiliary power supply.
- Inspect, clean, and service battery; replace as needed.
- Inspect and clean battery boxes, mounts, and hold-downs; repair or replace as needed.
- Test, and clean battery cables and connectors; repair or replace as needed.
- Electrical / Electronic Systems - Starting System
- Demonstrate understanding of starter system operation.
- Perform starter circuit cranking voltage and voltage drop tests; determine needed action.
- 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.
- Diagnose causes of no-crank or slow crank condition; differentiate between electrical and engine mechanical problems; determine needed action.
- Perform starter current draw tests; determine needed action.
- Remove and replace starter; inspect flywheel ring gear or flex plate.
- Electrical / Electronic Systems - Charging System
- Identify and understand operation of the generator (alternator).
- Test instrument panel mounted voltmeters and/or indicator lamps; determine needed action.
- 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.
- Inspect cables, wires, and connectors in the charging circuit.
- Perform charging circuit voltage drop tests; determine needed action.
- Remove, inspect, and/or replace generator (alternator).
- Electrical / Electronic Systems - Lighting Systems
- Diagnose causes of brighter-than-normal, intermittent, dim, or no-light operation; determine needed action.
- Test, replace, and aim headlights.
- Inspect cables, wires, and connectors in the lighting systems.
- Diagnose faults in tractor-to-trailer multi-wire connector(s), cables, and holders; determine needed action.
- Diagnose faults in switches, relays, bulbs/LEDs, wires, terminals, connectors, sockets, and control components/modules of exterior lighting systems; determine needed action.
- Electrical / Electronic Systems - Instrument Cluster and Driver Information Systems
- Check gauge and warning indicator operation.
- 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; determine needed action.
- Inspect, test, replace, and calibrate (if applicable) electronic speedometer, odometer, and tachometer systems.
- Electrical / Electronic Systems - Cab and Chassis Electrical Systems
- Diagnose operation of horn(s), wiper/washer, and occupant restraint systems.
- Describe operation of safety systems and related circuits (such as: speed control, collision avoidance, lane departure, and camera systems).
- 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).
- Describe operation of entertainment systems and related circuits (such as: radio, DVD, navigation, speakers, antennas, and voice-activated accessories).
- Describe the operation of power inverter, protection devices, connectors, terminals, wiring, and control components/modules of auxiliary power systems.
- Describe operation of telematics systems.
- Heating, Ventilation, And Air Conditioning (HVAC) - General
- Research vehicle service information, including refrigerant/oil type, vehicle service history, service precautions, and technical service bulletins.
- Identify heating, ventilation, and air conditioning (HVAC) components and configuration.
- Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.
- Diagnose heating and air conditioning problems; determine needed action.
- Identify refrigerant type; test for contamination; select and connect proper gauge set/test equipment; record temperature and pressure readings.
- Perform A/C system performance test; determine needed action.
- Perform A/C system leak test; determine needed action.
- Inspect condition of refrigerant oil removed from A/C system; determine needed action.
- Determine oil and oil capacity for system application and/or component replacement.
- Heating, Ventilation, And Air Conditioning (HVAC) - Refrigeration System Components
- Inspect, remove, and replace A/C compressor drive belts, pulleys, and tensioners; verify proper belt alignment.
- Check A/C system operation including system pressures; visually inspect A/C components for signs of leaks; check A/C monitoring system (if applicable).
- Inspect A/C condenser for airflow restrictions; determine needed action.
- Inspect, test, service, and/or replace A/C compressor and clutch assembly; check compressor clutch air gap; determine needed action.
- Inspect, service, and/or replace A/C system hoses, lines, fittings, O-rings, seals, and service valves.
- Inspect, remove, and/or replace receiver/drier or accumulator/drier.
- Inspect, remove, and/or replace expansion valve or orifice (expansion) tube.
- Inspect evaporator housing water drain; perform needed action.
- Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and/or control module) to interrupt system operation; determine needed action.
- Determine procedure to remove and reinstall evaporator.
- Determine procedure to inspect and/or replace condenser.
- Heating, Ventilation, And Air Conditioning (HVAC) - Heating, Ventilation, and Engine Cooling Systems
- Inspect engine cooling system and heater system hoses and pipes; determine needed action.
- Inspect HVAC system heater ducts, doors, hoses, cabin filters, and outlets; determine needed action.
- Identify the source of A/C system odors; determine needed action.
- Diagnose temperature control problems in the HVAC system; determine needed action.
- Determine procedure to remove, inspect, reinstall, and/or replace engine coolant and heater system components.
- Heating, Ventilation, And Air Conditioning (HVAC) - Operating Systems and Related Controls
- Verify HVAC system blower motor operation; confirm proper air distribution; confirm proper temperature control; determine needed action.
- Inspect and test HVAC system blower motors, resistors, switches, relays, wiring, and protection devices; determine needed action.
- Diagnose A/C compressor clutch control systems; determine needed action.
- Diagnose malfunctions in the vacuum, mechanical, and electrical components, and controls of the HVAC system; determine needed action.
- Heating, Ventilation, And Air Conditioning (HVAC) - Refrigerant Recovery, Recycling, and Handling
- Understand correct use and maintenance of refrigerant handling equipment.
- Understand how to identify A/C system refrigerant; test for sealants; recover, evacuate, and charge A/C system; add refrigerant oil as required.
- CAB - General
- Research vehicle service information, including vehicle service history, service precautions, and technical service bulletins.
- 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.
- CAB - Instruments and Controls
- 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 electronic power take-off (PTO) and engine idle speed controls (if applicable).
- Check operation of all accessories.
- Understand operation of auxiliary power unit (APU)/electric power unit (EPU).
- CAB - Safety Equipment
- 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 condition of wiper blades, arms, and linkage; determine needed action.
- CAB - Hardware
- 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 and grab handles; inspect mirrors, mountings, brackets, and glass; determine needed action.
- Record all physical damage.
- Lubricate all cab grease fittings; inspect and lubricate door and hood hinges, latches, strikers, lock cylinders, safety latches, linkages, and cables.
- Inspect cab mountings, hinges, latches, linkages, and ride height; determine needed action.
- Inspect quarter fender, mud flaps, and brackets; determine needed action.
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