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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. Prepare to diagnose and repair diesel fuel injection 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 diesel fuel injection system
   • Engine tune adjustments are checked and rectified as required according to manufacturer specifications, workplace procedures, and safety and environmental requirements
   • Fuel system diagnostic tests are carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements
   • Faulty components are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings and recommendations for necessary repairs or adjustments are reported according to workplace procedures
3. Repair diesel fuel injection 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, safety and environmental 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 diesel fuel injection 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 diesel fuel injection system
   • Engine tune adjustments are checked and rectified as required according to manufacturer specifications, workplace procedures, and safety and environmental requirements
   • Fuel system diagnostic tests are carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements
   • Faulty components are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings and recommendations for necessary repairs or adjustments are reported according to workplace procedures
7. Repair diesel fuel injection 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, safety and environmental 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.

Safety and environmental requirements must include:

work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for working with high pressure diesel fuel systems environmental requirements, including procedures for trapping, storing and disposing of fluids released from fuel injection systems.

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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 two different light vehicles with diesel engines, in which the work must involve:

removing, refitting and timing a diesel high pressure pump

removing, refitting and testing injectors

bleeding a diesel fuel injection system

removing and refitting a low pressure fuel pump.

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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 diesel fuel injection systems, including procedures for working with high pressure fuel systems

environmental requirements, including procedures for trapping, storing and disposing of fluids released from fuel injection systems

operating principles of diesel fuel injection systems and associated components, including:

phases of combustion

composition of diesel fuel, including cetane and sulphur content

application, purpose and operation of diesel fuel injection systems and components, including:

high pressure injection pump systems

distributor pumps, including axial and radial types

in-line injection pump systems

mechanically controlled unit type systems

testing procedures for diesel fuel injection systems, including procedures for:

assessing exhaust smoke

testing low fuel pressure pump

testing injector opening pressure and spray pattern

testing injector for back leakage and nozzle leakage

assessing and testing air induction system

assessing and testing engine performance

repair procedures for diesel fuel injection systems, including procedures for:

dismantling, cleaning, adjusting and reassembling conventional and two-spring injectors

removing, installing and timing high pressure injection pumps

bleeding fuel systems

post-repair testing procedures for diesel fuel injection systems, including assessing:

system leakage

engine performance.

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