Application

This unit of competency defines the skills and knowledge required to carry out diagnosis and rectification of circuits used in controller area network (CAN) and other fieldbus systems and control technology components in mobile and stationary plant.

It applies to systems and components that do not require a host computer. The unit can apply to circuits used for communication with and between systems and components, including systems for engine management, suspension, hydraulics and pneumatics, chassis and body management, braking systems, mechanical, electrical and hydraulic drives, lighting control, air conditioning, vehicle guidance and telemetry.

No licensing, legislative or certification requirements apply to this unit at the time of publication.

What You'll Learn

Assessment Requirements

Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy the requirements of the elements and performance criteria on at least two (2) occasions and include:

following work instructions, standard operating procedures (SOPs) and safe work practices

identifying and interpreting specifications, standards, charts, lists, SOPs, electrical drawings and diagrams to diagnose and rectify fieldbus circuits in mobile and stationary plant and equipment

selecting and using the correct test instrument, including multimeters, amp meters and circuit testers for bus and control system circuits and components

assessing condition and serviceability of components, including connectors, resistors, harnesses, boards, sensors, switches, fuses and seals

applying Ohm’s Law to determine the required values of current, voltage and resistance of a range of electrical circuits, including series, parallel and series parallel

connecting electrical test instruments into given circuits to determine the required values of current, voltage and resistance in a safe and effective manner

connecting and adjusting multi-channel and general purpose oscilloscopes to a given electrical circuit to measure wave forms at nominated points in the circuit

fault finding using fault-finding techniques to identify wiring faults in electrical circuits

selecting appropriate replacement cables according to size, rating and insulation resistance from supplier catalogues

making up replacement wiring looms, strip and prepare cable ends for termination and terminate to specifications

testing terminations for continuity and to comply with requirements

removing and/or neutralising corrosion from terminals and connections and applying appropriate protective coating.

Knowledge Evidence

Evidence required to demonstrate the required knowledge for this unit must be relevant to and satisfy the requirements of the elements and performance criteria and include knowledge of:

safe work practices and procedures and use of personal protective equipment (PPE)

principles of electron theory

definitions of current, voltage and resistance in terms of electrical circuits

Ohm’s Law and the relationships between current, voltage and resistance for a variety of given electrical circuits

instruments and procedures to be used to measure current, voltage and resistance and safety precautions to be taken

procedures for maintaining electrical test equipment

principles and functions of two wire differential serial bus systems, including:

communication and power cables for bus systems

voltage states relative to shield or ground and role in information transfer

logic states

channels

communication protocols, including message priority and identification

electronic control modules (ECMs)

engine control modules

power distribution boards

ground modules

typical diagnostic codes and faults

cabin displays

symbols used in electrical drawings/diagrams

components of a variety of electrical circuits identified by given electrical drawings/diagrams

differences between series and parallel electrical circuits

function of a general purpose and multi-channel oscilloscopes and procedures for connecting oscilloscopes to bus and control system circuits and components

use of wave forms in the testing of circuits

accuracy to which electrical test equipment can be read

examples and causes of common faults in electrical wiring and test procedures for isolating wiring faults

specifications of cables and wires including insulation resistance used in given electrical circuits

test procedures for terminated wiring and cables

effect of corrosion on the performance of electrical circuits and connections

common faults and causes in sensors, relays, solenoids, contacts and circuits and procedures for testing circuit components.

Assessment Conditions

Assessors must:

have vocational competency in diagnosing and rectifying fieldbus circuits in mobile and stationary plant and equipment at least to the level being assessed with relevant industry knowledge and experience

satisfy the assessor requirements in the Standards for Registered Training Organisations 2015 or its replacement and comply with the National Vocational Education and Training Regulator Act 2011, its replacement or equivalent legislation covering VET regulation in a non-referring state/territory as the case requires

Where possible assessment must occur in operational workplace situations. Where this is not possible or where personal safety or environmental damage are limiting factors, assessment must occur in a sufficiently rigorous simulated environment that reflects realistic operational workplace conditions. This must cover all aspects of workplace performance, including environment, task skills, task management skills, contingency management skills and job role environment skills

Conditions for assessment must include access to all tools, equipment, materials and documentation required, including relevant workplace procedures, product and manufacturing specifications

Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate

Foundation Skills

• text: This section describes those required skills (reading, writing, oral communication and numeracy) that are essential to workplace performance in this unit of competency. Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

Prerequisite Units

• {'code': 'MEM09002', 'title': 'Interpret technical drawing'}
• {'code': 'MEM11011', 'title': 'Undertake manual handling'}
• {'code': 'MEM12023', 'title': 'Perform engineering measurements'}
• {'code': 'MEM13015', 'title': 'Work safely and effectively in manufacturing and engineering'}
• {'code': 'MEM16006', 'title': 'Organise and communicate information'}
• {'code': 'MEM18001', 'title': 'Use hand tools'}
• {'code': 'MEM18002', 'title': 'Use power tools/hand held operations'}
• {'code': 'MEM18055', 'title': 'Dismantle, replace and assemble engineering components'}
• {'code': 'MEM27006', 'title': 'Diagnose and rectify batteries, low voltage sensors and circuits'}

Parent Qualifications

• MEM40119 — Certificate IV in Engineering
  MEM

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