Unit of competency Outline

Date retreived
23/07/2026 6:06 AM AWST

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Diagnose complex faults in CNG fuel systems

Diagnose complex faults in CNG fuel systems

Unit of competency
National Code
AURTTL011
State Code
AXA51
TGA Status
Replaced
DTWD Status
Transition (Replaced)
Current Release Number
1.00
Current Release Date
14/04/2016
View on TGA
State Implementation and Classification
Approved Date
13/07/2016
Field of Education
030503 - Vehicle Mechanics
Original Release Date
13/07/2016
Nominal Hours
45
Description
This unit describes the performance outcomes required to diagnose complex faults in compressed natural gas (CNG) fuel systems and determine the repair action necessary to restore system performance. It involves confirming the existence of a fault, choosing the diagnostic procedure and tools, applying the diagnostic procedure, reporting conclusions and making repair recommendations.Complex faults are outside the normal scope of a technician’s diagnosis and repair work. They include intermittent faults, multi-system faults, faults introduced as a result of system repairs, and indirect faults caused by the influence of external systems, requiring the application of complex diagnostic processes to resolve.It applies to those working in the automotive service and repair industry. The CNG fuel systems include those in vehicles from all sectors of the industry.Licensing, legislative, regulatory or certification requirements may apply to this unit in some jurisdictions. Users are advised to check with the relevant regulatory authority.
Notes
Elements and Performance Criteria
1. Identify and confirm the work requirement
  • 1.1 Nature and objective of diagnosis requirements are determined from workplace instructions
  • 1.2 Existence of fault in CNG fuel system is confirmed from direct or indirect evidence
  • 1.3 Hazards associated with the work are identified and risks are managed according to workplace procedures, and safety and environmental requirements
2. Prepare to carry out diagnosis
  • 2.1 Manufacturer specifications and other technical information for CNG fuel system are accessed and interpreted
  • 2.2 Diagnostic procedures and options are identified
  • 2.3 Diagnostic method sequence, tests and testing processes are selected from the range of available options
  • 2.4 Testing equipment is selected and prepared according to manufacturer specifications and workplace procedures
  • 2.5 Tools, equipment and materials required to support the diagnostic process are identified, selected and prepared for use
3. Apply diagnostic procedures
  • 3.1 Selected diagnostic process is followed and testing is carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements
  • 3.2 Diagnostic findings are confirmed, as required, by using reliable alternative or optional process according to manufacturer specifications and workplace procedures
  • 3.3 Conclusions are drawn from findings and documented according to workplace procedures, including recommendations for necessary repairs that comply with AS/NZS 2739 Natural gas (NG) fuel systems for vehicle engines
  • 3.4 Conclusions are provided to appropriate personnel or customer to confirm further action to be taken
4. Complete work processes
  • 4.1 Vehicle or machinery is presented ready to be repaired or returned to the customer
  • 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
No information
No information
Replaces
State Code National Code Title Type
WF432 AURTTL4011 Diagnose complex faults in CNG fuel systems Unit of competency
Replaced By
State Code National Code Title Type
OCJ87 AURTTL111 Diagnose complex faults in CNG fuel systems Unit of competency
State Code National Code Title Type
BAB6 AUR40216 Certificate IV in Automotive Mechanical Diagnosis Qualification