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Diagnose complex faults in CNG fuel systems

KHU-AUT-0425

Australian Equivalent
AURTTL111
Elements
4
Learning Outcomes
15

This unit describes the skills and knowledge 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. The unit 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, r

Elements & Learning Outcomes

4
E1Identify and confirm the work requirement
0425.E1.O1Determine nature and objective of diagnosis requirements from workplace instructions
0425.E1.O2Confirm existence of fault in CNG fuel system from direct or indirect evidence
0425.E1.O3Identify hazards associated with the work and manage risks according to workplace procedures, and safety and environmental requirements
E2Prepare to diagnose complex faults
0425.E2.O1Access and interpret manufacturer specifications and other technical information for CNG fuel system
0425.E2.O2Identify diagnostic procedures and options
0425.E2.O3Select diagnostic method sequence, tests and testing processes from the range of identified options
0425.E2.O4Select and prepare testing equipment according to manufacturer specifications and workplace procedures
0425.E2.O5Identify, select and prepare tools, equipment and materials required to support the diagnostic process for use
E3Apply diagnostic procedures
0425.E3.O1Follow selected diagnostic process and carry out testing according to manufacturer specifications, workplace procedures, and safety and environmental requirements
0425.E3.O2Confirm diagnostic findings, as required, by using alternative or optional process according to manufacturer specifications and workplace procedures
0425.E3.O3Draw and document conclusions from findings according to workplace procedures and develop recommendations for required repairs that comply with AS/NZS 2739 Natural gas (NG) fuel systems for vehicle engines
0425.E3.O4Provide conclusions to required personnel or customer to confirm further action to be taken
E4Complete work processes
0425.E4.O1Conduct final inspection according to workplace procedures and confirm vehicle is ready for use
0425.E4.O2Clear work area and dispose of or recycle materials according to workplace procedures
0425.E4.O3Complete documentation according to workplace procedures
SEAL — South East Asia Learning Identifier & Skills Portal · Prepared for MLVT Executive approval and TVET institute review · Derived from the Australian National Training Register (training.gov.au, CC-BY) and aligned to the Cambodian Qualifications Framework and DSC Standard Training Packages · Delivered via Gibble SMS · July 2026