Learner workbook


AURT366108A Carry out diagnostic procedures



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AURT366108A Carry out diagnostic procedures


This unit covers the competence required to diagnose component/equipment faults from different symptoms and to nominate repair action.

Elements:


1. Prepare to diagnose faults

2. Apply technology to isolate fault(s)

3. Recommend rectification method(s)

4. Component/equipment is prepared for customer use


About the workbook


This workbook is designed to assist you in gaining underpinning knowledge and developing practical skills to achieve the competency standard AURT366108A Carry out diagnostic procedures within the context of light vehicles.

This workbook contains:



  • information

  • questions

  • practical activities

  • directions to use additional resources.


The workbook is divided into stages. At the end of a stage, you will see an icon (picture with a meaning) asking you to check your answers and/or practical activities with your trainer. This helps the trainer to monitor your progress.

What do the icons mean?

An icon is a picture with a meaning. In the workbook, these icons tell you something about:



  • what to do next (activity, check your answers, watch a video clip) or

  • the text (this is a safety warning).





Complete an activity



Check your answers with your trainer



Watch this video clip



Safety warning

Assessment


To meet the assessment requirements for this competency standard you must demonstrate the following:

Knowledge of:



  • OH&S regulations/requirements, equipment, material and personal safety requirements

  • diagnostic procedures and problem-solving techniques

  • symptom and cause differentiation

  • work organisation and planning processes

  • enterprise quality procedures

  • document responsibilities

  • document procedures.


Practical ability to:

  • Develop a diagnosis strategy to determine a fault

  • Carry out systematic diagnosis to test for a range of faults, using meters/ gauges/ measuring equipment

  • Interpret test results and identify the actual fault/s

  • Recommend rectification method/s.

  • Report findings in approved workplace format


Skills Recognition


You may already have knowledge and skills for all (or part) of this competency standard. If you believe you can demonstrate that you already have the skills and knowledge required, talk to your trainer about applying for Skills Recognition.

This is also known as Recognition of Prior Learning (RPL), Recognition of Current competence (RCC), or simply Recognition.

Skills Recognition is a process for gaining credit for those skills and knowledge gained through work experience, formal training or other life experience.

Access and equity


In training, access and equity means ensuring that people with differing needs and abilities have the same opportunities to successfully gain skills, knowledge and experience through education and training. It is about removing barriers and providing the supports people need to access, participate and achieve, irrespective of their age, disability, colour, race, gender, religion, sexuality, family responsibilities or location.

For students with disabilities, training organisations may make adjustments to ensure equal opportunity. Reasonable adjustments are designed to minimise the disadvantage experienced by learners with a disability and can include administrative, physical or procedural modifications.




NOTE:
If you believe you could benefit from support to help you overcome a barrier to participation, you should speak to your trainer or the person in your RTO responsible for access and equity.



Introduction


This workbook assumes that you have already achieved competence in all the other vehicle systems you need for your work.

The workbook will help you to develop skills in applying your technical knowledge in a systematic way to diagnose faults in vehicles or other machinery.



The workbook uses the term ‘vehicle’ but all the processes and procedures can also be applied to other machines or pieces of equipment.

What is ‘diagnosis’?


Motor vehicles (or machines or other equipment) sometimes break down. They develop faults or problems, and repair technicians (that’s you) need the knowledge and skills to:

  • find the cause of the fault, and

  • fix it.

The first step is called ‘fault diagnosis’.

How do you do it?


Guessing is not good enough - you need to make a systematic, logical series of checks to identify the fault. You need:

  • a sound knowledge of the principles and operation of the system or component being checked

  • to be able to recognise whether a component is working normally or not

  • to think carefully about all the things that could cause a particular fault

  • to test each possible cause to identify (or diagnose) the actual problem.


Diagnosis is the process of identifying a fault, determining its cause and selecting possible solutions. Sometimes it is called ‘trouble shooting’ or ‘fault finding’.

What is ‘normal’ and ‘abnormal’?


Everything in a vehicle is in either a ‘normal state’ or an ‘abnormal state’.

Normal means things are okay; they are the way they should be.

Abnormal means things are NOT okay, or NOT the way they should be.

We can say that either ... the steering is working normally, or it is not.

... the alternator is charging normally, or it is not.

... the handbrake is working normally, or it is not.


We can also talk about ‘normal events’ and ‘abnormal events’.
An event is something that happens.
An event occurs when a gear is selected, or a turn signal lights up, or the cooling fan turns on.

A normal event is when something happens in exactly the way it should.

An abnormal event is when something happens NOT in the way it should.

For example, the engine misses, the steering loses power assistance, or a rod comes out through the side of the engine block.

The purpose of all motor vehicle diagnosis is:


  • to recognise abnormal states and abnormal events

  • to find the cause of those abnormal things, and

  • to recommend repairs which will return the vehicle to its normal state of operation.


What is a diagnostic procedure?


A procedure is a logical set of steps to follow. Using a logical procedure will help you to diagnose a vehicle’s problem quickly and efficiently. All diagnostic techniques are based on logical thinking and a systematic approach to solving the problem. They often take the form of a diagram or flow chart.

You might find diagnostic procedures in the vehicle manufacturer’s workshop manual, or you might make one up yourself based on your knowledge and experience.

This workbook explains how to use and develop diagnostic procedures.

Safety


All diagnostic procedures must be carried out safely. Working safely helps prevent injury to yourself and others. It also prevents damage to the vehicle or test equipment.

Today’s sophisticated vehicle systems (such as electronic systems for engine, transmission and body management; anti-lock brakes and vehicle stability control) can easily be damaged by unsafe or careless test and repair procedures.



Any damage or injury in the workplace can be very costly – look at some of the costs in the table below.

Damage or injury

Costs

Injury to a worker

  • pain, possible disablement

  • medical costs

  • loss of income

  • government safety inspections

  • increased workplace insurance premiums

Damage to a vehicle

  • cost to the workshop

  • reduced profits

  • damaged reputation


Make sure you follow all:



  • Occupational Health and Safety (OHS) guidelines

  • safety instructions from your employer

  • vehicle or system safety precautions given by the vehicle manufacturer.

ALWAYS wear suitable Personal Protective Equipment (PPE). Minimum PPE requirements are:

  • glasses or mask to protect eyes from flying particles and liquid sprays

  • gloves for handling hot items and chemicals

  • suitable neat-fitting overalls or clothing

  • safety footwear.

Some jobs will require specialised equipment, such as a respirator.
Any supplied PPE must be used when a job requires it.




THINK SAFETY at all times


Tasks and hazards


Here are some of the risks and hazards you may be exposed to when doing diagnosis and repair tasks:

Hazard

Advice

Fire

Watch out for fuel leaks when working on fuel systems.
Eliminate anything which could start a fire.

Keep a fire extinguisher nearby.



Lifting

Never lift more than you can manage.

Ask for help, or use lifting equipment.



Exhaust Gases

Running engines need good ventilation.

Carbon monoxide (CO) in the exhaust can kill you.



Other exhaust chemicals can cause asthma and cancer.

Running Engines

Don’t wear loose clothing when working around a running engine.
You could be dragged into drive belts or other moving parts.

Electric Shock

Ignition systems produce voltages of 30,000 to 50,000 volts.

Reaction to an accidental shock can throw you into contact with moving parts such as the fan or drive belts.



Batteries

Batteries contain sulphuric acid (H2SO4).

Battery acid will destroy clothing, burn skin, and can cause blindness if it gets in your eyes.



Batteries also generate explosive hydrogen gas (H2) when charging, so keep sparks away.



Figure 1: Be careful with battery acid


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