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Glossary of terms you will come across during your Phase 2 training.


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Acid-proof glovesDuring Phase 2, you will spend a lot of time working with lead-acid batteries. In order to protect your hands from acid, you will be issued with acid-proof gloves.

You will also be issued with an acid-proof apron to protect against acid spillages.

You should wear the gloves, apron and your safety goggles whenever you work with lead-acid batteries.

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This alerts the operator or the service technician that an electronic system malfunction is currently present. Refer to the term Diagnostic Code in this glossary.
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Ackermann angle

Imaginary lines drawn through the king pin and the track control rod end on each side of a vehicle will intersect at a point just in front of the rear axle of that vehicle. The angle they make with each other is known as the Ackermann angle.

The purpose of the angle is to allow the front wheels to turn through different angles when cornering. This is because the inside wheel always needs to turn through a bigger angle in order to get around the corner without scrubbing.

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Word formed by using the first letter of other words, for example:

RAM-Random Access Memory

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Pressure sensors - active sensorsUnlike a passive sensor, an active sensor needs a power supply. There are 3 terminals on a pressure sensor. One is a supply, one is ground, and the third sends a signal back to the ECM.

Here, we can see the example of a pressure sensor. There are 3 terminals. We know this is an active sensor because it has these 3 terminals.

  1. Pin A is a 5 volt supply into the sensor.
  2. Pin B is common, meaning it is grounded to 0 volts.
  3. Pin C sends a signal back to the ECM. From this signal, the ECM calculates the pressure acting on the sensor.
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In certain course modules, such as the small plant module, there are activity sheets for you to download. Once you do this, you should work your way through the sheet, carrying out all the activities listed, and researching answers to all the qeustions asked by searching this website, your own course notes and the world wide web.

The small plant module covers a large range of machinery, so it can be very difficult to cover everything.

Acitvity sheets will guide you to study all matters related to health and safety, theory and practical work. If you do all activity sheets, you will not come across anything in the practical or theory exams that you have not already researched as you worked your way through the activity sheets.

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Acupuncture probe in useA needle-like probe used in automotive diagnostics when probing wires and connector blocks for electrical signals.

It is very easy to cause damage to wires, their insulation and to connector blocks when trying to diagnose electrical problems. You must make good metal to metal contact with electrical circuits to analyse them, but it is essential you do not cause any damage when doing so.

An acupuncture probe is smooth and pointed, allowing you to slide the probe into connector blocks without causing damage. The probe then connects to your voltmeter or oscilloscope by way of the standard 4mm connector.

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This denotes a self-learning system.
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This is a software process that is performed in the ECM that optimises engine performance.
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Sometimes, course participants may feel they can add more to an explanation given in this glossary. In cases like this, they can add comments. See the comment at the bottom of this entry. (Please note: comments are only visible to registered users who are logged in.)

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