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Elements and Performance Criteria

1. Identify and confirm the work requirement
   • Nature and objective of diagnostic requirements are determined from workplace instructions
   • Existence of fault in heavy vehicle diesel engine is confirmed from direct or indirect evidence
   • Hazards associated with the work are identified and risks are managed according to workplace procedures and safety and environmental requirements
2. Prepare to perform diagnosis
   • Manufacturer specifications and other technical information for diesel engine are accessed and interpreted
   • Diagnostic procedures and options are identified
   • Diagnostic method sequence, tests and testing processes are identified and selected from the range of available options
   • Testing equipment is obtained and prepared according to manufacturer specifications and workplace procedures
   • Tools, equipment and materials required to support the diagnostic process are identified, selected and prepared for use
3. Apply diagnostic procedures
   • Selected diagnostic process is followed and testing is carried out according to manufacturer specifications, workplace procedures and safety and environmental requirements
   • Diagnostic findings are verified, as required, by using reliable alternative or optional process according to manufacturer specifications and workplace procedures
   • Conclusions are drawn from findings and documented according to workplace procedures, including recommendations for necessary repairs
   • Conclusions are provided to appropriate personnel or customer to confirm further action to be taken
4. Complete work processes
   • Vehicle is presented ready to be repaired or returned to the customer
   • Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected
   • Tools and equipment are checked and stored according to workplace procedures
5. Identify and confirm the work requirement
   • Nature and objective of diagnostic requirements are determined from workplace instructions
   • Existence of fault in heavy vehicle diesel engine is confirmed from direct or indirect evidence
   • Hazards associated with the work are identified and risks are managed according to workplace procedures and safety and environmental requirements
6. Prepare to perform diagnosis
   • Manufacturer specifications and other technical information for diesel engine are accessed and interpreted
   • Diagnostic procedures and options are identified
   • Diagnostic method sequence, tests and testing processes are identified and selected from the range of available options
   • Testing equipment is obtained and prepared according to manufacturer specifications and workplace procedures
   • Tools, equipment and materials required to support the diagnostic process are identified, selected and prepared for use
7. Apply diagnostic procedures
   • Selected diagnostic process is followed and testing is carried out according to manufacturer specifications, workplace procedures and safety and environmental requirements
   • Diagnostic findings are verified, as required, by using reliable alternative or optional process according to manufacturer specifications and workplace procedures
   • Conclusions are drawn from findings and documented according to workplace procedures, including recommendations for necessary repairs
   • Conclusions are provided to appropriate personnel or customer to confirm further action to be taken
8. Complete work processes
   • Vehicle is presented ready to be repaired or returned to the customer
   • Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected
   • Tools and equipment are checked and stored according to workplace procedures

Range Statement

This section specifies work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Bold italicised wording, if used in the performance criteria, is detailed below.

Safety and environmental requirements must include:

work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for working with hot engine components and rotating engine components environmental requirements, including procedures for trapping, storing and disposing of fluids released from diesel engines.

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Performance Evidence

Before competency can be determined, individuals must demonstrate they can perform the following according to the standard defined in this unit’s elements, performance criteria, range of conditions and foundation skills:

diagnose complex faults in three different heavy vehicle diesel engines

the above diagnosis must involve 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

Individuals must be able to demonstrate knowledge of:

work health and safety (WHS) and occupational health and safety (OHS) requirements relating to diagnosing complex faults in heavy vehicle diesel engines, including procedures for working with hot engine components and rotating engine components

environmental requirements, including procedures for trapping, storing and disposing of fluids released from diesel engines

types of complex faults relating to heavy vehicle diesel engines, including:

intermittent

multi-system

introduced as a result of system repair

indirect, caused by the influence of external systems

types, function and operation of heavy vehicle diesel engines, including:

intake, exhaust, lubrication, cooling and engine mounting systems and components

turbochargers

valve timing

testing procedures for heavy vehicle diesel engines, including:

wet and dry compression tests

cylinder leakage tests

oil pressure tests

sources of fluid leaks

exhaust smoke diagnosis

abnormal noise analysis

types, functions, operation and limitations of diagnostic testing equipment required to diagnose complex faults in heavy vehicle diesel engines

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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