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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Identify and confirm the work requirement
   • Determine nature and objective of diagnosis requirements from workplace instructions
   • Confirm existence of fault in LPG fuel system from direct or indirect evidence
   • Identify hazards associated with the work and manage risks according to workplace procedures, and safety and environmental requirements
2. Prepare to diagnose complex faults
   • Access and interpret manufacturer specifications and other technical information for LPG fuel system
   • Identify diagnostic procedures and options
   • Select diagnostic method sequence, tests and testing processes from the range of available options
   • Select and prepare testing equipment according to manufacturer specifications and workplace procedures
   • Identify, select and prepare tools, equipment and materials required to support the diagnostic process for use
3. Apply diagnostic procedures
   • Follow selected diagnostic process and carry out testing according to manufacturer specifications, workplace procedures, and safety and environmental requirements
   • Confirm diagnostic findings, as required, by using alternative or optional process according to manufacturer specifications and workplace procedures
   • Draw and document conclusions from findings according to workplace procedures, and develop recommendations for required repairs that comply with AS/NZS 1425 LP Gas fuel systems for vehicle engines
   • Provide conclusions to required personnel or customer to confirm further action to be taken
4. Complete work processes
   • Conduct final inspection according to workplace procedures and confirm vehicle is ready for use
   • Clear work area and dispose of or recycle materials according to workplace procedures
   • Complete documentation according to workplace procedures

Performance Evidence

The candidate must demonstrate the ability to complete the tasks outlined in the elements, performance criteria and foundation skills of this unit, including evidence of the ability to:

diagnose a complex fault in at least three different liquefied petroleum gas (LPG) fuel systems

the above diagnoses must involve at least two of the following types of complex faults:

an intermittent fault

a fault that affects more than one system

a fault introduced as a result of a system repair

an indirect fault caused by the influence of external systems.

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Knowledge Evidence

The candidate must be able to demonstrate knowledge to complete the tasks outlined in the elements, performance criteria and foundation skills of this unit, including knowledge of:

methods to locate and interpret information required to diagnose complex faults in LPG fuel systems, including:

manufacturer specifications and procedures or equivalent documentation

workplace procedures required to diagnose complex faults in LPG fuel systems, including:

establishing serviceability of tools and equipment

documentation procedures

housekeeping procedures, including:

examination of tools and equipment

storage of equipment

identification, tagging and isolation of faulty equipment

disposal of excess materials

recycling procedures

work health and safety (WHS) requirements relating to diagnosing complex faults in LPG fuel systems, including procedures for working with heavier-than-air flammable gas

environmental requirements, including procedures for preventing loss of gas to atmosphere

types of complex faults relating to LPG fuel systems, including:

intermittent

multi-system

introduced as a result of system repair

indirect, caused by the influence of external systems

types and key features of LPG fuel systems, including:

converter-mixer systems

injection systems

requirements of AS/NZS 1425 LP Gas fuel systems for vehicle engines

testing procedures for LPG fuel systems, including:

component failure analysis

safety component operation

electrical control systems

exhaust emissions

on-road fuel efficiency

data interpretation

types and key features of diagnostic testing equipment required to diagnose complex faults in LPG fuel systems

procedures for accessing and interpreting scan tool system data, including:

diagnostic trouble codes (DTCs), including:

conditions that set the DTCs

conditions for running DTCs

live data

freeze frame data

waveforms

vehicle continuous and non-continuous monitored systems

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

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