Diagnose faults where no prescribed process or format is available in light vehicle environments
URN: IMILV14
Business Sectors (Suites): Maintenance and Repair - Light Vehicle
Developed by: IMI
Approved on:
2020
Overview
This NOS is about devising and implementing strategies to diagnose faults when the application of standard manufacturer diagnostic procedures has failed to reveal the source and cause of problems. You are also required to identify the best course of action to be taken to correct problems.
Performance criteria
You must be able to:
P1 use suitable personal and vehicle protective equipment throughout all diagnostic related activities in the workshop
P2 confirm with the relevant people that all standard diagnostic procedures and techniques have been systematically and correctly applied to the vehicle prior to undertaking further work
P3 prepare the vehicle systems and work area for safe working procedures as appropriate to the vehicle
P4 analyse all previous system fault information, diagnostic test methods and results correctly to verify the inconclusive results prior to undertaking further work
P5 liaise with the relevant manufacturer's representative to obtain up to date information, advice and guidance relevant to the identified fault, when necessary
P6 use diagnostic methods which are relevant to the symptoms presented
P7 collect diagnostic information in a logical, systematic and structured way which progressively eliminates all possible causes of the fault
P8 apply the checks and tests that are most likely to be effective in revealing the cause of the fault
P9 carry out all diagnostic activities following:
P9.1 your workplace proceduresP9.2 health, safety and environmental requirementsP9.3 environmental requirementsP10 work in a way which minimises the risk of:P10.1 damage to other vehicle systemsP10.2 damage to other components and unitsP10.3 contact with leakagesP10.4 contact with hazardous substancesP11 use any equipment required, correctly and safely throughout all diagnostic and rectification activitiesP12 collect sufficient diagnostic information to enable an accurate diagnosis of the faultP13 correctly identify the cause(s) of the faultP14 identify and record any system deviation from acceptable limits accuratelyP15 accurately ensure your assessment of dismantled sub-assemblies, components and units identifies their condition and suitability for repair or replacementP16 make clear recommendations for a suitable course of action to rectify the faultP17 inform the relevant person(s) promptly where repairs are uneconomic or unsatisfactory to performP18 complete all system checks and tests in the most cost and time effective way for the fault presentedP19 complete all system diagnostic activities within the agreed timescaleP20 ensure your records are accurate, complete and passed to the relevant person(s) within the agreed timescale and in the format requiredP21 report any anticipated delays in completion to the relevant person(s) promptly
Knowledge and Understanding
You need to know and understand:
Legislative and organisational requirements and procedures
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K1 the legislation and workplace procedures relevant to
K1.1 health and safetyK1.2 the environment (including waste disposal)K1.3 appropriate personal and vehicle protective equipmentK2 legal requirements relating to the vehicle (including road safety requirements)K3 your workplace procedures for:K3.1 recording fault location and correction activitiesK3.2 reporting the results of testsK3.3 the referral of problemsK3.4 reporting delays to the completion of workK4 how to formulate and construct your own diagnostic procedures and processes in order for diagnostic activities to proceedK5 the importance of documenting diagnostic and rectification informationK6 the importance of working to agreed timescales and keeping others informed of progressK7 the relationship between time, costs and productivityK8 the importance of reporting anticipated delays to the relevant person(s) promptly
Electrical and electronic principles
K9 electrical and electronic principles including types of sensors and actuators, their application and operationK10 how electrical and electronic vehicle systems operate, including electrical component function, electrical inputs, outputs, voltages and oscilloscope patterns, digital and fibre optics principlesK11 the interaction between electrical, electronic, mechanical and hydraulic components and systems within a vehicle, including multiplexingK12 electrical symbols, units and termsK13 electrical safety proceduresK14 the hazards associated with working on or near high energy electrical vehicle components
Use of diagnostic and rectification equipment *
K15 how to prepare and check the accuracy of *diagnostic testing equipmentK16 how to use diagnostic and rectification equipment for mechanical, electrical, hydraulic/pneumatic and fluid systems, specialist repair tools and general workshop equipment
Vehicle system faults, their diagnosis and correction
K17 how vehicle mechanical, electrical, electronic, hydraulic/pneumatic and fluid systems are constructed and operateK18 how vehicle mechanical, electrical, electronic, hydraulic/pneumatic and fluid systems are dismantled, reassembled and adjusted to manufacturers’ specificationK19 the types and causes of vehicle mechanical, electrical, electronic, hydraulic/pneumatic and fluid system, component and units faults and failuresK20 vehicle mechanical, electrical, electronic, hydraulic/pneumatic and fluid component and units replacement procedures, the circumstances which will necessitate replacement and other possible courses of actionK21 how to find, interpret and use sources of information on vehicle mechanical, electrical, electronic, hydraulic/pneumatic and fluid system operating specifications, diagnostic test procedures, repair procedures and legal requirements
K22 how to select the most appropriate diagnostic testing method for the symptoms presented
K23 how to carry out systematic diagnostic testing of vehicle mechanical, electrical, electronic, hydraulic/pneumatic and fluid systemsK24 how to interpret, evaluate and analyse test results and vehicle data in order to identify the location and cause of vehicle system faultsK25 how to carry out the rectification activities in order to correct faults in vehicle mechanical, electrical, electronic, hydraulic/pneumatic and fluid systemsK26 your workplace procedure, policy and procedure for:K26.1 work carried out under warrantyK26.2 liaising with manufacturers and outside agenciesK27 the relationship between test methodology and the faults repaired – the use of appropriate testing methodsK28 how to make cost effective recommendations for rectification
Scope/range
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*1. Causes of faults** are:
1.1. mechanical1.2. electrical1.3. electronic1.4. hydraulic/pneumatic2. Faults cover the:
2.1. vehicle engine area2.2. transmission and driveline area2.3. chassis system area2.4. electrical and electronic units and components area3. Diagnostic methods are:
3.1. measurement3.2. functional testing3.3. electrical and electronic systems testing4. Diagnostic testing is defined as:
4.1. verify the fault4.2. collect further information4.3. evaluate the evidence4.4. carry out further tests in a logical sequence4.5. rectify the problem4.6. check all systems5. Equipment is:
5.1. diagnostic and rectification equipment for mechanical systems5.2. diagnostic and rectification equipment for electrical and electronic systems5.3. diagnostic and rectification equipment for hydraulic/pneumatic and fluid systems5.4. specialist repair tools5.5. general workshop equipment6. Operating specifications include:
6.1. limits
6.2. fits6.3. tolerances
Scope Performance
Scope Knowledge
Values
Behaviours
Skills
Glossary
This section contains examples and explanations of some of the terms used but does not form part of the standard.
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Diagnostic equipment:
Examples include electronic testing equipment, brake testing equipment, steering geometry equipment, wheel balancing equipment, emission test equipment, measuring instruments, special service tools, charging service stations, noise and vibration detection equipment.
Recommendations:
Examples include: dismantling, return to manufacturer, repair or replacement.
Rectification activities* are defined as:
A suitable repair, replacement, re-coding or re-programming that rectifies the fault(s) identified from the diagnostic activities carried out.
Vehicles:
These can be any of the following types of light vehicles: SI, CI, Hybrid, Electric or Alternative fuel vehicles.
Alternative fuel:
This is defined as any type of fuel that may be used to power an internal combustion engine, examples would include LPG, bio ethanol etc.
VEHICLE AREAS - *
Engine area:
Engines, cooling systems, electronic ignition, petrol fuel injection, diesel fuel injection, engine management systems, starting systems, charging systems.
Transmission and driveline area:
Clutch assemblies, clutch operating systems, manual gear boxes, automatic gear boxes (including electronic control), drivelines and hubs and final drive assemblies.
Chassis or Frame area:
Suspension systems, assisted steering systems, non-assisted steering systems, braking systems, ABS/traction control, wheels and tyres, stability systems, bodywork and related areas.
Electrical and electronic area:*
Body electrical systems (including wiring harnesses, lighting systems, auxiliaries, CANBUS systems, fibre optics, vehicle condition and monitoring, comfort and convenience, alarm systems), supplementary restraint systems (SRS), heating and air conditioning systems, climate control, communication equipment, navigation systems and entertainment equipment.
Links To Other NOS
External Links
Version Number
3
Indicative Review Date
2024
Validity
Current
Status
Original
Originating Organisation
IMI Ltd
Original URN
LV14
Relevant Occupations
Engineering, Light Vehicle Diagnostic Technician (Automotive), Light Vehicle Fleet/Service Manager (Automotive), Light Vehicle Master Technician (Automotive), Vehicle Trades
SOC Code
5231
Keywords
Diagnose; faults; prescribed; process; format; motor; vehicle; guided; diagnosis