Diagnose faults where no prescribed process or format is available in light vehicle environments

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.

P9.1 your workplace procedures

P9.2 health, safety and environmental requirements

P9.3 environmental requirements

P10 work in a way which minimises the risk of:

P10.1 damage to other vehicle systems

P10.2 damage to other components and units

P10.3 contact with leakages

P10.4 contact with hazardous substances

P11 use any equipment required, correctly and safely throughout all diagnostic and rectification activities

P12 collect sufficient diagnostic information to enable an accurate diagnosis of the fault

P13 correctly identify the cause(s) of the fault

P14 identify and record any system deviation from acceptable limits accurately

P15 accurately ensure your assessment of dismantled sub-assemblies, components and units identifies their condition and suitability for repair or replacement

P16 make clear recommendations for a suitable course of action to rectify the fault

P17 inform the relevant person(s) promptly where repairs are uneconomic or unsatisfactory to perform

P18 complete all system checks and tests in the most cost and time effective way for the fault presented

P19 complete all system diagnostic activities within the agreed timescale

P20 ensure your records are accurate, complete and passed to the relevant person(s) within the agreed timescale and in the format required

P21 report any anticipated delays in completion to the relevant person(s) promptly

K1.1 health and safety

K1.2 the environment (including waste disposal)

K1.3 appropriate personal and vehicle protective equipment

K2 legal requirements relating to the vehicle (including road safety requirements)

K3 your workplace procedures for:

K3.1 recording fault location and correction activities

K3.2 reporting the results of tests

K3.3 the referral of problems

K3.4 reporting delays to the completion of work

K4 how to formulate and construct your own diagnostic procedures and processes in order for diagnostic activities to proceed

K5 the importance of documenting diagnostic and rectification information

K6 the importance of working to agreed timescales and keeping others informed of progress

K7 the relationship between time, costs and productivity

K8 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 operation

K10 how electrical and electronic vehicle systems operate, including electrical component function, electrical inputs, outputs, voltages and oscilloscope patterns, digital and fibre optics principles

K11 the interaction between electrical, electronic, mechanical and hydraulic components and systems within a vehicle, including multiplexing

K12 electrical symbols, units and terms

K13 electrical safety procedures 

K14 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 equipment

K16 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 operate

K18 how vehicle mechanical, electrical, electronic, hydraulic/pneumatic and fluid systems are dismantled, reassembled and adjusted to manufacturers’ specification

K19 the types and causes of vehicle mechanical, electrical, electronic, hydraulic/pneumatic and fluid system, component and units faults and failures

K20 vehicle mechanical, electrical, electronic, hydraulic/pneumatic and fluid component and units replacement procedures, the circumstances which will necessitate replacement and other possible courses of action

K21 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 systems

K24 how to interpret, evaluate and analyse test results and vehicle data in order to identify the location and cause of vehicle system faults

K25 how to carry out the rectification activities in order to correct faults in vehicle mechanical, electrical, electronic, hydraulic/pneumatic and fluid systems

K26 your workplace procedure, policy and procedure for:

K26.1 work carried out under warranty

K26.2 liaising with manufacturers and outside agencies

K27 the relationship between test methodology and the faults repaired – the use of appropriate testing methods

K28 how to make cost effective recommendations for rectification

1.1. mechanical

1.2. electrical

1.3. electronic

1.4. hydraulic/pneumatic

2. Faults cover the:

2.1. vehicle engine area

2.2. transmission and driveline area

2.3. chassis system area

2.4. electrical and electronic units and components area

3. Diagnostic methods are:

3.1. measurement

3.2. functional testing

3.3. electrical and electronic systems testing

4. Diagnostic testing is defined as:

4.1. verify the fault

4.2. collect further information

4.3. evaluate the evidence

4.4. carry out further tests in a logical sequence

4.5. rectify the problem

4.6. check all systems

5. Equipment is:

5.1. diagnostic and rectification equipment for mechanical systems

5.2. diagnostic and rectification equipment for electrical and electronic systems

5.3. diagnostic and rectification equipment for hydraulic/pneumatic and fluid systems

5.4. specialist repair tools

5.5. general workshop equipment

6. Operating specifications include:

6.1. limits

6.2. fits

6.3. tolerances