Unit of competency details

AURT304666A - Repair and replace emission control systems (Release 1)


Usage recommendation:
Is superseded by AURHTZ3001 - Diagnose and repair heavy vehicle emission control systems 16/Jan/2013
Is superseded by AURLTZ3001 - Diagnose and repair light vehicle emission control systems 16/Jan/2013

Release Status:
ReleaseRelease date
1 1 (this release) 21/Jun/2011

Qualifications that include this unit

CodeSort Table listing Qualifications that include this unit by the Code columnTitleSort Table listing Qualifications that include this unit by the Title columnRelease
AUR20805 - Certificate II in Outdoor Power EquipmentCertificate II in Outdoor Power Equipment
AUR30911 - Certificate III in MotorsportCertificate III in Motorsport1-2 
AUR20811 - Certificate II in Outdoor Power EquipmentCertificate II in Outdoor Power Equipment1-2 
AUR20611 - Certificate II in MarineCertificate II in Marine1-2 
AUR30711 - Certificate III in Outdoor Power EquipmentCertificate III in Outdoor Power Equipment1-2 
AUR30611 - Certificate III in Automotive SpecialistCertificate III in Automotive Specialist
AUR30705 - Certificate III in Outdoor Power EquipmentCertificate III in Outdoor Power Equipment
AUR21005 - Certificate II in MotorsportCertificate II in Motorsport
AUR20505 - Certificate II in Automotive Vehicle ServicingCertificate II in Automotive Vehicle Servicing1-2 
AUR40208 - Certificate IV in Automotive TechnologyCertificate IV in Automotive Technology1-2 
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SchemeCodeClassification value
ASCED Module/Unit of Competency Field of Education Identifier 030503 Vehicle Mechanics  

Classification history

SchemeCodeClassification valueStart dateEnd date
ASCED Module/Unit of Competency Field of Education Identifier 030503 Vehicle Mechanics  18/Nov/2005 
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Modification History

Not Applicable

Unit Descriptor

Unit descriptor 

This unit covers the competence required to carry out repairs to emission control systems.

Application of the Unit

Application of the unit 

The unit includes identification and confirmation of work requirement, preparation for work, repair of emission control systems and associated components and completion of work finalisation processes, including clean-up and documentation.

This unit of competence applies to the following and should be contextualised to the qualification to which it is being applied:

  • light and heavy vehicles, marine equipment and motorcycles.

This unit of competence does not cover emission control systems associated with engine management systems.

Work requires individuals to demonstrate discretion, judgement and problem-solving skills in managing own work activities and contributing to a productive team environment.

Work is carried out in accordance with award provisions.

Licensing/Regulatory Information

Not Applicable


Prerequisite units 

Employability Skills Information

Employability skills 

This unit contains employability skills.

Elements and Performance Criteria Pre-Content

Elements describe the essential outcomes of a unit of competency.

Performance criteria describe the performance needed to demonstrate achievement of the element. Where bold italicised text is used, further information is detailed in the required skills and knowledge section and the range statement. Assessment of performance is to be consistent with the evidence guide.

Elements and Performance Criteria



1. Prepare to undertake repair of emission control system

1.1. Nature and scope of work requirements are identified and confirmed

1.2. OH&S requirements, including individual State/Territory regulatory requirements and personal protection needs are observed throughout the work

1.3. Procedures and information such as workshop manuals and specifications, and tooling, are sourced

1.4. National Environment Protection Measure for Diesel Vehicles (Guidelines) is sourced and observed throughout the work as applicable to tasks

1.5. Method options are analysed and those most appropriate to the circumstances are selected and prepared

1.6. Technical and/or calibration requirements for repair are sourced and support equipment is identified and prepared

2. Repair and replace emission control systems and/or associated components

2.1. Correct information is accessed and interpreted from manufacturer/component supplier specifications

2.2. Testing equipment is selected

2.3. Tests are performed and results analysed in accordance with manufacturer/component supplier specifications

2.4. Emission control system repair and replacement are carried out according to industry regulations/guidelines, OH&S legislation, legislation and enterprise procedures/policies

2.5. Emission control systems repair/replacement is completed without causing damage to any component or system

2.6. Repair and replacement of emission control systems are carried out in accordance with industry regulations/ guidelines, OH&S legislation, legislation and enterprise procedures/policies

3. Prepare vehicle/ equipment for delivery to customer after repair is completed

3.1. Repair documentation is completed

3.2. Final inspection is made to ensure safety features are in place

3.3. Final inspection is made to ensure work is to workplace expectations

3.4. Vehicle/equipment is presented to workplace expectations

3.5. Job card is processed in accordance with workplace procedures

Required Skills and Knowledge


This section describes the skills and knowledge required for this unit.

Required skills 

  • apply research and interpretive skills sufficient to locate, interpret and apply manufacturer/component supplier procedures, workplace policies and procedures
  • apply analytical skills for identification and analysis of technical information
  • apply plain English literacy and communication skills in relation to dealing with customers and team members
  • apply questioning and active listening skills for example when obtaining information from customers
  • apply oral communication skills sufficient to convey information and concepts to customers
  • apply planning and organising skills to own work activities, including making good use of time and resources, sorting out priorities and monitoring own performance
  • interact effectively with other persons both on a one-to-one basis and in groups, including understanding and responding to the needs of a customer and working effectively as a member of a team to achieve a shared goal
  • use mathematical ideas and techniques to correctly calculate time, assess tolerances, apply accurate measurements, calculate material requirements and establish quality checks
  • establish safe and effective work processes which anticipate and/or resolve problems and downtime, to systematically develop solutions to avoid or minimise reworking and avoid wastage
  • use workplace technology related to repair and replacement of emission control systems, including the use of measuring equipment, electronics, computerised technology, specialist emission control system tooling and equipment and communication devices and the documenting/recording of results

Required knowledge 

A working knowledge of:

  • OH&S regulations/requirements, equipment, material and personal safety requirements
  • legislation and penalties
  • identification of motor vehicle emissions and their effects on the environment
  • the identification of application, purpose and operation
  • the identification of component parts to include physical, fluid, gases and heat generation
  • the principles of emission control and reduction of HC, NOx, CO, CO, particulates and smog
  • types and layout of service/repair manuals (hard copy and electronic)
  • types of emission systems and components
  • the interpretation of technical information, graphic symbols and diagrams
  • testing procedures
  • repair procedures
  • enterprise quality procedures
  • work organisation and planning processes

Evidence Guide


The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package.

Overview of assessment 

Critical aspects for assessment and evidence required to demonstrate competency in this unit 

It is essential that competence is fully observed and there is ability to transfer competence to changing circumstances and to respond to unusual situations in the critical aspects of:

  • observing safety procedures and requirements
  • communicating effectively with others involved in or affected by the work
  • selecting methods and techniques appropriate to the circumstances
  • completing preparatory activity in a systematic manner
  • identification of application, purpose and operation
  • application of full repair sequence as per the Range Statement to an emission control system relative to the qualification being sought
  • interpreting test results
  • conducting repair in accordance with workplace and manufacturer/component supplier requirements
  • vehicle/equipment presentation to customer in compliance with workplace requirements

Context of , and specific resources for assessment 

Application of competence is to be assessed in the workplace or simulated worksite

The following resources should be made available:

  • workplace location or simulated workplace
  • material relevant to the repair and replacement of emission control systems
  • equipment, hand and power tooling appropriate to the repair and replacement of emission control systems
  • activities covering mandatory task requirements
  • specifications and work instructions

Method of assessment 

Assessment is to occur using standard and authorised work practices, safety requirements and environmental constraints

Assessment is to comply with regulatory requirements, including Australian Standards

Assessment must satisfy the endorsed assessment guidelines of the automotive industry's RS&R Training Package

Assessment methods must confirm consistency and accuracy of performance together with application of underpinning knowledge

Assessment must be by direct observation of tasks, with questioning on underpinning knowledge and it must also reinforce the integration of key competencies

Assessment may be applied under project related conditions and require evidence of process

Assessment must confirm a reasonable inference that competence is able not only to be satisfied under the particular circumstance, but is able to be transferred to other circumstances

It is preferable that assessment reflects a process rather than an event and occurs over a period of time to cover varying quality circumstances. Evidence of performance may be provided by customers, team leaders/members or other persons subject to agreed authentication arrangements

Competence in this unit may be assessed in conjunction with other functional units which together form part of the holistic work role

Guidance information for assessment 

Range Statement


The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.

Repair methods 

Methods include:

  • road testing or dynamometer testing, exhaust gas testing
  • visual, aural and functional assessments (including: damage, corrosion, air leaks, wear, testing of electrical circuits)
  • measurements
  • electronic system tests

Specific requirements 

Specific requirements may include, sensing and control systems, including: carbon canisters, mechanical devices, catalytic converters, electronic sensors, EGR values


Other variables may include, appropriate licence

Repair methods and sequence 

Repair methods and sequence are to include isolation of fault(s), dismantling, inspection and evaluation, replacement of components parts, assembly and completion of operational tests and records


Faults include, rough running, poor performance, excessive fuel consumption and overheating

OH &

OH&S requirements are to be in accordance with legislation/regulations/codes of practice and enterprise safety policies and procedures. This may include protective clothing and equipment, use of tooling and equipment, workplace environment and safety, handling of material, use of fire fighting equipment, enterprise first aid, hazard control and hazardous materials and substances

Personal protective equipment 

Personal protective equipment is to include that prescribed under legislation/regulation/codes of practice and workplace policies and practices

Safe operating procedures 

Safe operating procedures are to include, but are not limited to operational risk assessment and treatments associated with vehicular movement, toxic substances, electrical safety, machinery movement and operation, manual and mechanical lifting and shifting, working in proximity to others and site visitors

Emergency procedures 

Emergency procedures related to this unit are to include but may not be limited to emergency shutdown and stopping of equipment, extinguishing fires, enterprise first aid requirements and site evacuation

Environmental requirements 

Environmental requirements are to include but are not limited to waste management, noise, dust and clean-up management

Quality requirements 

Quality requirements are to include, but are not limited to regulations, including Australian Standards, internal company quality policy and standards and enterprise operations and procedures

Statutory /regulatory authorities 

Statutory/regulatory authorities may include Federal, State/Territory and local authorities administering acts, regulations and codes of practice

Tooling and equipment 

Tooling and equipment may include hand tooling, testing equipment, including; exhaust gas analysers, hand held meters, and power tooling, specialist tooling for testing, removal or adjustment and dynamometers


Materials may include lubricants, cleaners, spare parts and sealants


Communications are to include but are not limited to verbal and visual instructions and fault documenting and may include site specific instructions, written instructions, plans or instructions related to job/task, telephones and pagers

Information /documents 

Sources of information/documents may include:

  • verbal or written and graphical instructions, signage, work schedules/plans/specifications, work bulletins, memos, material safety data sheets, diagrams or sketches
  • safe work procedures related to the repair and replacement of emission control systems
  • regulatory/legislative requirements pertaining to automotive industry, including Australian Design Rules
  • engineer's design specifications and instructions
  • organisation work specifications and requirements
  • instructions issued by authorised enterprise or external persons
  • Australian Standards

Unit Sector(s)

Unit sector 


Co-requisite units

Co-requisite units 

Competency field

Competency field