Unit of competency details

Release 

Comment 

Release 2 

Replaces AURETH4009 Diagnose and repair DC to DC converters in battery electric vehicles (Release 1)

Reference to OHS legislation replaced with new WHS legislation

Unit descriptor 

This unit describes the performance outcomes required to diagnose and repair high voltage (HV) direct current (DC) to low voltage (LV) DC converters in battery electric vehicles (BEVs). It involves working with LV automotive electrical components as well as HV alternating current (AC) and DC automotive electrical components and battery systems. Work includes testing the converter and relevant accessories and applications for correct operation.

Importance is placed on the application of HV safety procedures.

Licensing, legislative, regulatory or certification requirements may apply to this unit in some jurisdictions. Users are advised to check with the relevant regulatory authority.

Application of the unit 

Work applies to the diagnosis, repair and replacement of the DC to DC converter in BEVs in the automotive industry.

Prerequisite units 

AURETH3001 Depower battery electric vehicles

AURETR3025 Test, charge and replace batteries

Employability skills 

This unit contains employability skills.

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.

ELEMENT 

PERFORMANCE CRITERIA  

1. Prepare for repair operations

1.1. Procedures and information  relevant to the task are sourced and work requirements confirmed

1.2. Workplace health and safety (WHS) requirements  and appropriate precautions  are identified and applied

1.3. Repair methods for the specific work requirement are selected and prepared for

1.4. Tools and testing equipment  necessary to conduct the work are assembled

1.5. Technical and/or calibration requirements for diagnosis and repair of the DC to DC converter are established

2. Perform diagnosis

2.1. Tests and checks  on DC to DC converter input and output voltage and current are carried out using manufacturer specifications and test procedures

2.2. Relevant applications and accessories  are tested and checked for correct operation

2.3. Test results are recorded

3. Repair DC to DC converter

3.1. Test results are compared with manufacturer specifications to decide on corrective action 

3.2. Components are removed and repaired or replaced as required

3.3. Replaced or repaired components are re-tested for correct operation

3.4. Replacement, repair or adjustment procedures are recorded on job card or repair order

4. Complete repair operations

4.1. Work area is tidied, and tools and equipment replaced according to workplace requirements 

4.2. Job card or repair order is completed according to workplace requirements

4.3. Client report is prepared on the outcomes of the diagnosis and repair according to workplace requirements

4.4. Vehicle is prepared for return to the client

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

Required skills 

• technical skills to:

• use workplace technology relating to the diagnosis and repair of BEV DC to DC converters
• use specialist tools and equipment
• use computerised measuring equipment
• report and record actions

• communication skills to:

• confirm work requirements and specifications
• communicate effectively regarding work requirements with supervisor, other workers and customers
• report work outcomes and problems

• literacy skills to interpret technical information and specifications
• numeracy skills to accurately complete tests and measurements to determine correct operation
• problem-solving skills to:

• interpret test results
• identify repair options

• self-management skills to:

• manage risks and hazards associated with the diagnosis and repair of BEV DC to DC converters
• optimise workflow and productivity

Required knowledge 

• components of HV BEVs and their functions
• WHS requirements relating to:

• safe work practices
• electrical safety
• principles of electricity, including AC and DC

• principles of operation of a DC to DC converter
• applicable commonwealth, state or territory legislation, regulations, standards and codes of practice and environmental regulations relating to the diagnosis and repair of a BEV DC to DC converter
• vehicle-specific electrical requirements
• workplace policies and procedures, including quality, recording and reporting procedures relating to the diagnosis and repair of a BEV DC to DC converter

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 

The evidence required to demonstrate competency in this unit must be relevant to workplace operations and satisfy all of the requirements of the performance criteria and required skills and knowledge.

A person who demonstrates competency in this unit must be able to:

• comply with WHS requirements and safe work practices
• ensure electrical and mechanical integrity of the DC to DC converter is maintained when performing tests
• diagnose the operation of the DC to DC converter against manufacturer specifications
• remove and replace or repair the DC to DC converter
• complete relevant documentation for the diagnosis and repair of the DC to DC converter.

Context of, and specific resources for assessment 

Competency is to be assessed in the workplace or a simulated workplace environment that accurately reflects performance in a real workplace setting.

Assessment is to occur:

• using standard workplace practices and procedures
• following safety requirements
• applying environmental constraints.

Assessment is to comply with relevant:

• regulatory requirements
• Australian standards
• industry codes of practice.

Competency is to be assessed using a BEV that uses HV and LV AC/DC electrical systems. Where simulation is used, an operational BEV must be included in the simulation.

The following resources must be made available for the assessment of this unit:

• appropriate PPE
• a BEV
• manufacturer specifications for the BEV
• testing equipment
• full range of essential tools and equipment
• workplace documentation.

Method of assessment 

Assessment must satisfy the endorsed Assessment Guidelines of this Training Package.

Assessment methods must confirm consistency and accuracy of performance (over time and in a range of workplace relevant contexts) together with the application of required skills and knowledge.

Assessment methods must be by direct observation of tasks and include questioning on required skills and knowledge to ensure correct interpretation and application.

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

Where applicable, reasonable adjustment must be made to work environments and training situations to accommodate the needs of diverse clients.

Assessment processes and techniques must be culturally sensitive and appropriate to the language, literacy and numeracy capacity of the candidate and the work being performed.

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, 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.

Procedures and information  may include:

• Australian standards
• diagrams and sketches
• engineer or manufacturer design specifications and instructions
• industry codes of practice
• material safety data sheets (MSDS)
• parts catalogues
• verbal, written and graphical instructions issued by authorised internal and external persons
• workplace specifications and requirements.

WHS requirements  may include:

• eliminating hazardous materials and substances
• first aid equipment
• following emergency procedures
• hazard and risk control
• personal protective equipment (PPE) and clothing
• safety equipment
• techniques for manual handling, including shifting, lifting and carrying.

Appropriate precautions  may include:

• analysing task to define risk
• applying electrical safety precautions, such as:

• “one hand rule”
• live system warning tags or signs

• checking for residual voltage
• depowering the vehicle
• isolating the HV battery electrical supply
• using PPE, such as:

• electrical safety gloves 1000V
• HV insulating mats (Australian standards rated).

Testing equipment  may include:

• AC/DC current clamp
• battery management system (BMS) diagnostic equipment
• multimeter CAT 3 1000V
• oscilloscope
• thermal imaging equipment or non-contact thermometer.

Tests and checks  may include:

• testing accessories and applications operating on LV DC
• testing input and output voltage and current.

Applications and accessories  may include:

• electric power steering (EPS)
• electric vacuum pump
• electric coolant pumps in:

• heating, ventilation and air conditioning (HVAC) system
• powertrain cooling system
• battery pack cooling system

• horn
• wipers
• radio
• lights
• indicators.

Corrective action  may include:

• removing and replacing converter
• replacing fuses.

Workplace requirements  may include:

• manufacturer specifications and industry codes of practice
• quality policies and procedures
• safe work procedures
• sustainability, environment, equal opportunity and anti-discrimination policies and procedures
• workplace recording and reporting procedures.

Competency field 

Electrical

Sector 

Technical – Hybrid and Battery Electric Vehicle