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Elements and Performance Criteria

1. Prepare to diagnose and repair light vehicle suspension 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 suspension system
   • Diagnostic tests are performed according to workplace procedures and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings are reported according to workplace procedures, including recommendations for necessary repairs or adjustments
3. Repair suspension 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, workplace procedures and safety 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 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 light vehicle suspension 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 suspension system
   • Diagnostic tests are performed according to workplace procedures and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings are reported according to workplace procedures, including recommendations for necessary repairs or adjustments
7. Repair suspension 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, workplace procedures and safety 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 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 stored energy in springs and torsion bars, including when removing tension from suspension components moving heavy suspension components.

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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 a light vehicle MacPherson strut suspension system, in which the work must involve removing and refitting or replacing the MacPherson strut

diagnose and repair a fault in a light vehicle coil spring suspension system, in which the work must involve removing and refitting or replacing the coil spring

diagnose and repair a fault in one of the following suspension system components, in which the work must involve removing the spring component from the vehicle:

leaf spring suspension system

torsion bar suspension system

pneumatic suspension 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 light vehicle suspension systems, including procedures for:

working with stored energy in springs and torsion bars, including when removing tension from suspension components

moving heavy suspension components

operating principles of light vehicle suspension systems and associated components, including:

rigid and independent suspensions

sprung and unsprung mass

ride and curb height

application, purpose and operation of light vehicle suspension systems and components, including:

coil spring suspension, including:

types of coil springs and deflection rates

front coil spring suspension arrangements, including short arm and long arm suspension

rear coil spring suspension arrangements

strut or MacPherson suspension

leaf spring suspension

torsion bar suspension

multi-link suspension

hydraulic suspension

pneumatic suspension

suspension system components, including:

ball joint function and operation

stabiliser bar function and operation

Watts link and Panhard rod function and operation

independent rear suspension arrangements and operation

shock absorber function and operation, including:

gas-filled shock absorbers

strut or MacPherson shock absorbers

hub assemblies and bearing arrangements, including:

hubs with tapered roller bearings

hubs with unitised bearings

diagnostic testing procedures for light vehicle suspension systems, including procedures for analysing:

component wear

abnormal system noise

repair procedures for light vehicle suspension systems, including procedures for:

removing and replacing ball joints, suspension bushes, shock absorbers, MacPherson struts, coil springs, leaf springs and torsion bars

compressing coil springs

replacing and adjusting bearings for hubs with:

tapered roller bearings

unitised bearings

post-repair testing procedures for light vehicle suspension systems.

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