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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 and workplace procedures
   • Diagnostic tests are carried out according to manufacturer specifications, workplace procedures, and environmental and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings, including 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 according to manufacturer procedures
   • Repairs and component replacements and adjustments are carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements, and without causing damage to components or systems
   • 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 and workplace procedures
   • Diagnostic tests are carried out according to manufacturer specifications, workplace procedures, and environmental and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings, including 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 according to manufacturer procedures
   • Repairs and component replacements and adjustments are carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements, and without causing damage to components or systems
   • 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 requirements must include:	work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for: working with: high fuel pressures stored fuel pressures high voltage diesel fuel injectors engine start-up and shut-down.
Environmental requirements must include:	procedures for trapping, storing and disposing of diesel fuel released from 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 a fault in two different heavy vehicle diesel fuel injection systems, completing the following with each system:

testing the low pressure fuel supply

removing and refitting a low pressure fuel pump

removing, refitting and timing a diesel high pressure pump

removing, refitting and testing injectors

bleeding a diesel fuel injection system.

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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 vehicle diesel fuel injection systems, including procedures for:

working with:

high fuel pressures

stored fuel pressures

high voltage diesel fuel injectors

engine start-up and shut-down

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

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

phases of combustion

composition of diesel fuel

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

low pressure fuel supply systems, including:

fuel pumps

filters and separators

high pressure diesel fuel injection systems, including:

distributor type injection pumps

in-line injection pumps

electronic unit injection (EUI)

hydraulic electronic unit injection (HEUI)

high pressure injection (HPI)

injectors

diagnostic testing procedures for diesel fuel injection systems, including:

assessing exhaust smoke

testing low pressure fuel systems

testing injector opening pressure, back leakage, nozzle leakage and spray pattern

assessing air induction systems

measuring individual cylinder exhaust temperature to determine underperforming cylinders

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

dismantling, cleaning, adjusting and reassembling conventional injectors

removing, installing and timing high pressure injection pumps

adjusting and tuning mechanical unit injection systems

bleeding fuel systems

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

checking fuel system leakage

assessing engine performance.

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