Application
This unit describes the performance outcomes required to diagnose and repair faults in the mechanical fuel injection systems of vehicles. It involves preparing for the task, selecting the correct diagnostic procedure, carrying out the diagnosis and the repair, performing post-repair testing, and completing workplace processes and documentation.
It applies to those working in the automotive service and repair industry. The mechanical fuel injection systems include those in light vehicles or light commercial vehicles.
No licensing, legislative, regulatory or certification requirements apply to this unit at the time of publication.
Elements and Performance Criteria
Elements Elements describe the essential outcomes. | Performance Criteria Performance criteria describe the performance needed to demonstrate achievement of the element. Where bold and italicised text is used, further information is detailed in the range of conditions section. |
1. Prepare to diagnose and repair mechanical fuel injection system | 1.1 Job requirements are determined from workplace instructions 1.2 Diagnostic information is sourced and interpreted 1.3 Diagnostic options are analysed and those most appropriate to the circumstances are selected 1.4 Hazards associated with the work are identified and risks are managed 1.5 Diagnostic tools and equipment are selected and checked for serviceability |
2. Diagnose mechanical fuel injection system | 2.1 Diagnostic tests are performed according to workplace procedures and safety and environmental requirements 2.2 Faults are identified from diagnostic test results and causes of faults are determined 2.3 Diagnosis findings and recommendations for necessary repairs or adjustments are reported according to workplace procedures |
3. Repair mechanical fuel injection system | 3.1 Repair information is sourced and interpreted 3.2 Repair options are analysed and those most appropriate to the circumstances are selected 3.3 Repair tools, equipment and materials are selected and checked 3.4 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 system 3.5 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 | 4.1 Final inspection is made to ensure work is to workplace expectations and vehicle or system is presented ready for use 4.2 Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected 4.3 Tools and equipment are checked and stored according to workplace procedures 4.4 Workplace documentation is processed according to workplace procedures |
Evidence of Performance
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 three mechanical fuel injection system components as follows:
one fuel distributor
two of the following:
fuel injector
fuel pressure regulator
fuel pump and filter
fuel accumulator.
Evidence of Knowledge
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 mechanical fuel injection systems, including procedures for working with high pressure petrol fuel systems
environmental requirements, including procedures for trapping, storing and disposing of fluids released from fuel systems
operating principles of mechanical fuel injection systems and associated components, including carburation
application, purpose and operation of mechanical fuel injection systems and components, including:
fuel supply, including:
high and low pressure system
electric fuel pump
fuel accumulator
fuel metering, including:
air-flow sensor
fuel distributor
differential pressure valves
fuel injectors
cold-start enrichment and warm-up enrichment, including:
cold-start valve
thermo-time switch
warm-up regulator
auxiliary air device
full load enrichment
diagnostic testing procedures for mechanical fuel injection systems, including procedures for:
testing injectors, including:
opening pressure
leakage integrity
spray shape
chatter
testing system pressure, including:
primary system pressure
control pressure
analysing exhaust gas
repair procedures for mechanical fuel injection systems, including procedures for removing, replacing and injection pump timing mechanical fuel injection systems
post-repair testing procedures for mechanical fuel injection systems.
Assessment Conditions
Assessors must satisfy NVR/AQTF assessor requirements.
Competency is to be assessed in the workplace or a simulated environment that accurately reflects performance in a real workplace setting.
Assessment must include direct observation of tasks.
Where assessment of competency includes third-party evidence, individuals must provide evidence that links them to the mechanical fuel injection systems that they have worked on, e.g. repair orders.
Assessors must verify performance evidence through questioning on skills and knowledge to ensure correct interpretation and application.
The following resources must be made available:
automotive repair workplace or simulated workplace
workplace instructions
manufacturer mechanical fuel injection system specifications
vehicles with faults in the mechanical fuel injection system components specified in the performance evidence
diagnostic equipment for mechanical fuel injection systems, including exhaust gas analyser
tools, equipment and materials appropriate for repairing mechanical fuel injection systems.
Foundation Skills
This section describes those language, literacy, numeracy and employment skills that are essential to performance and are not explicit in the performance criteria.
Skills | Description |
Learning skills to: | locate appropriate sources of information efficiently. |
Reading skills to: | interpret information from manufacturer and workshop literature when seeking mechanical fuel injection system specifications and procedures. |
Writing skills to: | legibly and accurately fill out workplace documentation when reporting diagnostic findings, making repair recommendations, and recording parts and material used. |
Oral communication skills to: | clarify instructions report diagnostic findings and make repair recommendations. |
Numeracy skills to: | measure mechanical fuel injection components and use basic mathematical operations, including addition, subtraction, multiplication and division to calculate distances, tolerances and deviations from manufacturer specifications interpret ratios and units, such as parts per million (PPM) from exhaust gas analysers. |
Planning and organising skills to: | plan own work requirements and prioritise actions to achieve required outcomes and ensure tasks are completed within workplace timeframes. |
Technology skills to: | use precision measuring equipment, such as micrometers. |
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 tests must include: | cold-start enrichment inspection cold and hot engine exhaust gas analysis. |
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 petrol fuel systems environmental requirements, including procedures for trapping, storing and disposing of fluids released from fuel systems. |
Post-repair testing must include: | cold-start enrichment inspection cold and hot engine exhaust gas analysis. |
Sectors
Technical - Fuel Systems
Competency Field
Mechanical - Light Vehicle