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Elements and Performance Criteria

1. Prepare to diagnose and repair a forced-induction system
   • Job requirements are determined from workplace instructions
   • Diagnostic information is sourced and interpreted
   • Diagnostic options are analysed and those most appropriate to the circumstances are selected
   • Hazards associated with the work are identified and risks are managed
   • Diagnostic tools and equipment are selected and checked for serviceability
2. Diagnose a forced-induction system
   • Diagnostic tests are carried out according to workplace procedures and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings are reported according to workplace procedures, including recommendations for necessary repairs or adjustments
3. Repair a forced-induction system
   • Repair information is sourced and interpreted
   • Repair options are analysed and those most appropriate to the circumstances are selected
   • Repair tools, equipment and materials are selected and checked
   • Repairs and component replacements and adjustments are carried out according to manufacturer specifications, workplace procedures and safety requirements, and without causing damage to components or system
   • Post-repair testing is carried out according to workplace procedures to confirm fault rectification, and any further problems detected as having been introduced during the repair process are rectified
4. Complete work processes
   • Final inspection is made to ensure work is to workplace expectations and system or vehicle is presented ready for use
   • 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
   • Workplace documentation is processed according to workplace procedures
5. Prepare to diagnose and repair a forced-induction system
   • Job requirements are determined from workplace instructions
   • Diagnostic information is sourced and interpreted
   • Diagnostic options are analysed and those most appropriate to the circumstances are selected
   • Hazards associated with the work are identified and risks are managed
   • Diagnostic tools and equipment are selected and checked for serviceability
6. Diagnose a forced-induction system
   • Diagnostic tests are carried out according to workplace procedures and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings are reported according to workplace procedures, including recommendations for necessary repairs or adjustments
7. Repair a forced-induction system
   • Repair information is sourced and interpreted
   • Repair options are analysed and those most appropriate to the circumstances are selected
   • Repair tools, equipment and materials are selected and checked
   • Repairs and component replacements and adjustments are carried out according to manufacturer specifications, workplace procedures and safety requirements, and without causing damage to components or system
   • Post-repair testing is carried out according to workplace procedures to confirm fault rectification, and any further problems detected as having been introduced during the repair process are rectified
8. Complete work processes
   • Final inspection is made to ensure work is to workplace expectations and system or vehicle is presented ready for use
   • 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
   • Workplace documentation is processed 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.

Diagnostic testsmust include:	assessing oil supply and return system assessing intake and exhaust system for leaks and blockages assessing turbocharger cooling system testing turbocharger boost air pressure.
Safety requirements must include:	work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for working with high temperature exhaust and intake system components.

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Performance Evidence

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

diagnose and repair a turbocharger fault in an engine forced-induction system

diagnose and repair a fault in two of the following components of engine forced-induction systems:

variable turbocharger

compound turbocharger

waste-gate actuator

intercooler

supercharger.

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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 and repairing engine forced-induction systems, including procedures for working with high temperature exhaust and intake system components

operating principles of engine forced-induction systems and associated components, including volumetric efficiency

application, purpose and operation of engine forced-induction systems and components, including:

turbochargers, including:

twin scroll

twin turbocharger

turbo compounding

variable geometry turbocharger

waste-gate operation

lubrication and cooling

intercooler operation, including air to air and water to air

supercharger operation

diagnostic testing procedures for engine forced-induction systems, including:

intake manifold pressure and vacuum testing

intake and exhaust system leak testing

turbo boost air pressure

intercooler pressure and temperature checks, types include air to air and air to water

oil supply

oil return to sump

turbocharger waste-gate testing

visual inspection for oil leakage

turbine rotating assembly end float and axial movement

repair procedures for engine forced-induction systems, including procedures for:

removing and replacing turbochargers

testing, removing, replacing and adjusting waste-gates

post-repair testing procedures for engine forced-induction systems.

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