Diagnose and rectify light vehicle chassis system faults

This NOS is about diagnosing and rectifying faults occurring within vehicle steering, suspension and braking systems.

P2.1 technical data

P2.2 diagnostic test procedures

P3 prepare the vehicle systems and work area for safe working procedures as appropriate to the vehicle

P4 prepare, check and use all the required equipment following manufacturers' instructions 

P5 use diagnostic methods which are relevant to the symptoms presented

P6 collect diagnostic information in a logical and systematic way relevant to the diagnostic methods used

P7 collect sufficient diagnostic information to enable an accurate diagnosis of chassis system faults

P8 identify and record any system deviation from manufacturer’s tolerances accurately

P9 accurately ensure your assessment of dismantled sub-assemblies, components and units identifies their condition and suitability for repair or replacement

P10 inform the relevant person(s) promptly where repairs are uneconomic or unsatisfactory to perform

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 vehicle systems

P12.2 damage to other components and units

P12.3 contact with leakages

P12.4 contact with hazardous substances

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

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

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

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

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

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

P19 complete all system diagnostic activities within the agreed timescale

P20 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 the importance of working to recognised diagnostic and rectification procedures and processes and obtaining the correct information for diagnostic and rectification 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 associated with *chassis systems, including types of sensors and actuators, their application and operation

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

K11 the interaction between electrical, electronic and mechanical components within vehicle chassis systems

K12 how chassis electrical systems interlink and interact, including multiplexing

K13 electrical symbols, units and terms

K14 electrical safety procedures 

K15 the hazards associated with working on or near high energy electrical vehicle components

Use of diagnostic and rectification equipment

K16 how to prepare and check the accuracy of diagnostic testing equipment

K17 how to use diagnostic and rectification equipment for chassis mechanical, electrical, hydraulic/pneumatic and fluid systems, specialist repair tools and general workshop equipment

Chassis faults, their diagnosis and correction *

K18 how *chassis mechanical, electrical, electronic, hydraulic/pneumatic and fluid systems are constructed and operate

K19 how chassis mechanical, electrical, electronic, hydraulic/pneumatic and fluid systems are dismantled, reassembled and adjusted to manufacturers specifications

K20 the types and causes of chassis mechanical, electrical, electronic, hydraulic/pneumatic and fluid system, component and unit faults and failures 

K21 chassis mechanical, electrical, hydraulic/pneumatic and fluid component and unit replacement procedures, the circumstances which will necessitate replacement and other possible courses of action

K22 how to find, interpret and use sources of information on chassis electrical operating specifications, diagnostic test procedures, repair procedures and legal requirements

K23 vehicle operating specifications for limits, fits and tolerances relating to chassis mechanical, electrical, electronic, hydraulic/pneumatic and fluid systems for the vehicle(s) on which you work

K24 how to select the most appropriate diagnostic testing method for the symptoms presented

K25 how to carry out systematic diagnostic testing of chassis mechanical, electrical, electronic, hydraulic/pneumatic and fluid systems using a prescribed process or format

K26 how to assess the condition evident within chassis mechanical, electrical, electronic, hydraulic/pneumatic and fluid components and units

K27 how to interpret test results and vehicle data in order to identify the location and cause of vehicle system faults

K28 how to carry out the rectification activities in order to correct faults in the chassis mechanical, electrical, electronic, hydraulic/pneumatic and fluid systems

K29 the relationship between test methodology and the faults repaired – the use of appropriate testing methods

K30 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. Diagnostic testing is defined as:

3.1. verify the fault

3.2. collect further information

3.3. evaluate the evidence

3.4. carry out further tests in a logical sequence

3.5. rectify the problem

3.6. check all systems

4. Equipment is:

4.1. diagnostic and rectification equipment for chassis mechanical systems

4.2. diagnostic and rectification equipment for chassis electrical systems

4.3. diagnostic and rectification equipment for chassis hydraulic/pneumatic and fluid systems

4.4. specialist repair tools

4.5. general workshop equipment

5. Faults are:

5.1. mechanical

5.2. electrical and electronic

5.3. hydraulic/pneumatic and fluid