Diagnose and rectify heavy vehicle trailer chassis system faults

This standard is about diagnosing and rectifying faults occurring within heavy vehicle trailer steering and suspension systems, braking systems and other systems fitted to heavy vehicle trailer chassis.

P2.1 technical data 

P2.2 diagnostic test procedures 

P3 prepare, connect and test all the required equipment following manufacturers' instructions prior to use 

P4 use diagnostic methods which are relevant to the symptoms presented 

P5 collect diagnostic information in a systematic way relevant to the diagnostic methods used 

P6 collect sufficient diagnostic information to enable an accurate diagnosis of chassis system faults 

P7 identify and record any system deviation from acceptable limits accurately 

P8 ensure your assessment of dismantled sub-assemblies, components and units identifies their condition and suitability for repair or replacement, accurately 

P9 promptly inform the relevant person(s) where repairs are uneconomic or   unsatisfactory to perform 

P10 use the equipment required, correctly and safely throughout all rectification activities *

P11 carry out all *rectification activities following: 

P11.1 manufacturers' instructions 

P11.2 your workplace procedures 

P11.3 health, safety and environmental requirements 

P12 work in a way which minimises the risk of: 

P12.1 damage to other systems, units and components 

P12.2 damage to your working environment 

P12.3 contact with leakages and hazardous substances 

P12.4 injury to self and others

P13 ensure all repaired and replaced components and units conform to the heavy vehicle trailer operating specification and any legal requirements 

P14 when necessary, adjust components and units correctly to ensure that they operate to meet system requirements 

P15 promptly record and report any additional faults you notice during the course of work  

P16 use diagnostic methods which are suitable for assessing the performance of the system rectified 

P17 ensure the chassis system rectified performs to the heavy vehicle trailer operating specification and any legal requirements prior to return to the customer 

P18 ensure your records are accurate, complete and promptly passed to the relevant person(s) in the format required 

P19 complete all system diagnostic activities within the agreed timescale 

P20 promptly report any anticipated delays in completion to the relevant person(s) 

K3.1 recording diagnostic and rectification activities 

K3.2 the referral of problems 

K3.3 reporting delays to the completion of work 

K4 the importance of, documenting diagnostic and rectification information 

K5 the importance of working to agreed timescales and keeping others informed of progress 

K6 the relationship between time, costs and profitability  

K7 the importance of promptly reporting anticipated delays to the relevant person(s)  

Electrical and electronic principles *

K8 electrical and electronic principles associated with *chassis systems including types of sensors and actuators, their application and operation 

K9 how electrical and electronic chassis systems operate, including electrical component function, electrical inputs, outputs, voltages and oscilloscope patterns, digital and fibre optics principles 

K10 the interaction between electrical, electronic and mechanical components within heavy vehicle trailer chassis systems 

K11 electrical symbols, units and terms 

K12 electrical safety procedures 

Use of diagnostic and rectification equipment *

K13 how to prepare and test the accuracy of diagnostic testing *equipment *

K14 how to use diagnostic and rectification *equipment for chassis mechanical, electrical, hydraulic and fluid systems, specialist repair tools and general workshop equipment 

*

Chassis faults, their diagnosis and correction 

K15 how chassis mechanical, electrical, electronic, pneumatic and hydraulic and fluid systems are constructed, dismantled, reassembled and operate 

K16 the types and causes of chassis mechanical, electrical, electronic, pneumatic and hydraulic and fluid system component and unit *faults and failures 

K17 chassis mechanical, electrical, electronic, pneumatic, hydraulic and fluid   component and unit replacement procedures, the circumstances which will necessitate replacement and other possible courses of action 

K18 how to find, interpret and use sources of information on chassis electrical and electronic operating specifications, diagnostic test procedures, repair procedures and legal requirements 

K19 heavy vehicle trailer or equipment operating specifications for limits, fits and tolerances relating to chassis mechanical, electrical, electronic, pneumatic and hydraulic and fluid systems for the heavy vehicle trailer(s) on which you work 

K20 how to select the most appropriate diagnostic testing method for the symptoms presented 

K21 how to carry out systematic diagnostic testing of chassis mechanical, electrical and electronic, pneumatic, hydraulic and fluid systems using a prescribed process or format 

K22 how to assess the condition evident within chassis mechanical, electrical, electronic, pneumatic, hydraulic and fluid components and units 

K23 how to interpret test results and heavy vehicle trailer data in order to identify the location and cause of heavy vehicle trailer system faults *

K24 how to carry out *r**ectification activities in order to correct faults in the chassis mechanical, electrical, electronic, pneumatic and hydraulic and fluid systems 

K25 the relationship between test methodology and the faults repaired – the use of appropriate testing methods 

K26 knowledge of vehicle to heavy vehicle trailer brake `threshold' pressures/delays 

K27 how to make cost effective recommendations for rectification

1.1. steering

1.2. suspension

1.3. braking 

2. Diagnostic methods are:

2.1. measurement

2.2. functional testing

2.3. electrical and electronic systems testing

3. Equipment is:

3.1. diagnostic and rectification equipment for chassis mechanical systems 

3.2. diagnostic and rectification equipment for chassis electrical systems 

3.3. diagnostic and rectification equipment for chassis hydraulic and fluid systems 

3.4. diagnostic and rectification equipment for chassis pneumatic systems 

3.5. specialist repair tools 

3.6. general workshop equipment 

4. Faults are:

4.1. mechanical 

4.2. electrical and electronic 

4.3. hydraulic and fluid 

4.4. pneumatic 

5. Rectification activities are: 

5.1. dismantling 

5.2. replacement of units and components 

5.3. adjustment of units and components 

5.4. repairs to wiring and connectors 

5.5. re-programming vehicle systems 

5.6. reassembly 

5.7. functional testing 

5.8. repairs to air line and connectors