Work applies to and includes system fault and failure diagnosis of vehicle CNG fuel systems.

The unit relates to an automotive technologist, master technician or subject matter specialist. It encompasses and builds on trade level competencies.

ELEMENT

PERFORMANCE CRITERIA

1. Identify and confirm the work requirement

1.1. Workplace instructions and reports are used to determine the nature and objective of system diagnosis requirements

1.2. Specifications for correctly functioning CNG fuel systems are accessed and interpreted

1.3. Workplace health and safety (WHS) requirements, including equipment and system isolation and personal protection needs, are observed and addressed throughout the work

1.4. Effects of systemic deficiencies and discrepancies or faults in CNG fuel systems are identified and confirmed from indirect or direct evidence

1.5. Possible safety impacts of the work are considered and responded to according to regulatory and workplace procedures

2. Prepare to perform diagnosis

2.1. Criteria for diagnosis are developed and adopted to meet the objective of the work

2.2. System performance achievements or discrepancies are identified from scrutiny of technical support information and available on-board diagnostic systems

2.3. Diagnostic methods, including complexity of diagnostic process, sequence, tests and testing process are identified and selected from the range of available options

2.4. Testing equipment is obtained and prepared for application according to manufacturer, component supplier and workplace requirements

2.5. Tools and materials required to support the diagnostic process are identified, selected and prepared for use

3. Apply complex diagnostic process

3.1. Selected diagnostic processes are followed according to specifications and workplace procedures

3.2. Testing is carried out according to workplace procedures and manufacturer and component supplier specifications

3.3. Findings are verified, if necessary, by using reliable alternate or optional processes

3.4. Conclusions are drawn from findings and documented according to workplace requirements

3.5. Information and detail related to the evaluation of diagnosis is provided to the appropriate person or customer to confirm further action to be taken

Required skills

communication skills to communicate ideas and information to enable confirmation of work requirements and specifications, coordination of work with site supervisor, other workers and customers, reporting of work outcomes and completion of regulatory, commercial and vehicle information systems inputs

numeracy skills to use mathematical ideas and techniques to complete measurements, calculate requirements, and present results of diagnosis

planning and organising skills to conclude complex diagnostic processes which anticipate and allow for risks, cater for both direct and indirect evidence and avoid or minimise reworking and avoid wastage

problem-solving skills to use available information to contribute to decision making strategies for solving complex problems as they relate to CNG fuel systems

self-management skills to plan and organise activities, including the planning of analytical processes, preparation of the worksite and the obtaining of testing equipment and materials to avoid backtracking, workflow interruptions or wastage

technical skills to use workplace tools relating to the complex diagnosis of CNG fuel systems, including the use of:

specialised tools and equipment

measuring equipment

technology skills to use workplace technology related to systems diagnosis, information research and management systems.

Required knowledge

concepts and principles of mechanical, fuel, electrical and electronic systems related to CNG fuel systems

concepts, types, functions, operations and limitations of CNG fuel systems and components

diagnostic theory, including concept, design and planning

types, functions, operations and limitations of diagnostic testing equipment related to CNG fuel systems

testing procedures for CNG fuel systems, including procedures for accessing and interpreting scan tool system data

methods and processes for documenting and reporting diagnostic findings and recommendations.

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:

interpret workplace instructions and locate and apply information

apply safety requirements, including the use of personal protective equipment

identify and select appropriate diagnosis processes to be performed

complete diagnosis of complex faults on a minimum of three different CNG fuel systems with real or simulated faults

document and report outcomes and required actions of diagnosis of complex faults in CNG fuel systems.

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.

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

workplace location or simulated workplace

vehicles systems with real or simulated CNG fuel system faults

tools and equipment appropriate for the diagnosis of complex faults in CNG fuel systems

technical reference information and workplace instructions.

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.

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.

Workplace health and safety (WHS) requirements:

are those prescribed under legislation, regulations, codes of practice, and workplace policies and procedures

may include:

protective clothing and equipment

use of tools and equipment

handling of material

use of fire-fighting equipment

first aid equipment

hazard control, including control of hazardous materials and toxic substances.

Faults may include:

direct failures in safety systems, electrical systems, fuel delivery system or sequential vapour injection

indirect faults caused by the influence of external systems (electrical and electronic) which may or may not be faulty in their primary operations

direct faults in input sensors, output actuators, wiring harness, computer systems, calibration and adjustment specifications

component specifications, component assembly, component damage and system modifications

mechanical and fuel system faults

Tests may include:

wiring and connector integrity, operation and specification of input and output devices, controlling electronic components and computers, data interpretation and readings related to direct, indirect and intermittent causes

liquid and vapour pressure, leakage, operation of all safety components and systems, electrical control systems, exhaust emissions, engine performance, CNG system performance and data interpretation

on-road CNG fuel efficiency testing

component test

Testing equipment may include:

multimeters, scan tools, test lights, pressure and vacuum gauges, water and mercury manometers, electronic leak detectors, engine tune oscilloscopes, fourgas engine analyser and exhaust pressure gauge,

test lights and test LEDs

manufacturer and component supplier testing equipment

Diagnostic processes may include:

analysing manufacturer and component supplier specifications, schematics and operational procedures related to CNG fuel systems

six-step troubleshooting plan

discover-investigate-fix methodology

Mechanical Miscellaneous

Unit sector

Technical – Alternative fuels

This unit contains employability skills.