24131 version 1

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Demonstrate knowledge of electronic components and their application in the automotive industry

Level / 3
Credits / 5

PurposeThis theory-based unit standard is for people in the automotive repair industry. People credited with this unit standard are able to demonstrate knowledge of: resistorsand thermistors used in automotive electronic applications; diodes used in automotive electrical and electronic applications; transistors used in automotive circuits; operational amplifier application for automotive circuits; silicon controlled rectifiers (SCRs) and thyristors inautomotive circuits; and sensors and actuators inautomotive circuits.

Subfield / Motor Industry
Domain / Automotive Electrical and Electronics
Status / Registered
Status date / 25 January 2008
Date version published / 25 January 2008
Planned review date / 31 December 2012
Entry information / Recommended: Unit 21707, Demonstrate knowledge of automotive electrical principles,or demonstrate equivalent knowledge and skills.
Replacement information / This unit standard, unit standard 24129, unit standard 24130, and unit standard 24132 replaced unit standard 5464. This unit standard and unit standard 24132 replaced unit standard 8187. This unit standard and unit standard 24134 replaced unit standard 15375. This unit standard and unit standard 24135 replaced unit standard 15376.
Accreditation / Evaluation of documentation and visit by NZQA and industry.
Standard setting body (SSB) / NZ Motor Industry Training Organisation (Incorporated)
Accreditation and Moderation Action Plan (AMAP) reference / 0014

This AMAP can be accessed at

Special notes

Information on automotive electronics can be found from: training provider, industry, or manufacturer courses; automotive electrical and electronic textbooks (contact a local book retailer, school or polytechnic library or the public library lending service); vehicle workshop manuals; useful websites include but are not limited to: Automotive Books Ltd Capital Books How Stuff Works New Zealand Book Find public libraries Technical Books Whitcoulls

Elements and performance criteria

Element 1

Demonstrate knowledge of resistors and thermistors used in automotive electronic

applications.

Rangelight dependent resistor (LDR), voltage dependent resistor (VDR), temperature dependent resistor (TDR).

Performance criteria

1.1Types of resistors and thermistors used for automotive electronic circuits are identified from textbook descriptions.

1.2Operational characteristics of each of the range of resistors and thermistors are explained in accordance with textbook descriptions.

1.3The effects of temperature change on resistors and thermistors are explained in accordance with textbook descriptions.

Rangepositive temperature co-efficient (PTC), negative temperature co-efficient (NTC).

Element 2

Demonstrate knowledge of diodes used in automotive electrical and electronic applications.

Performance criteria

2.1p-n junction characteristics are described in accordance with textbook descriptions.

Rangepositive and negative charged electron transfer, forward bias, reverse bias.

2.2Diode operation is described in accordance with textbook descriptions.

Rangerectifier diode, Zener diode, light emitting diode (LED), photo diode.

2.3Rectification patterns are identified by sketching alternating current (ac) halfwave and fullwave forms.

2.4Diode ratings for a given automotive application are identified in accordance with textbook descriptions.

Rangewattage, current, forward and reverse voltage.

2.5Use of diodes in an automotive application is described in terms of a dual charging system, transient protection, and a Zener diode as a voltage stabiliser.

2.6Replacement procedure for a diode in an automotive circuit is described in accordance with diode manufacturer specifications.

Rangerectifier diode, LED.

Element 3

Demonstrate knowledge of transistors used in automotive circuits.

Performance criteria

3.1The symbols, operation, and terminal layout of transistors are described in accordance with manufacturer specifications.

Rangebipolar junction transistor (BJT), field effect transistor (FET), Arlington transistor.

3.2The use of a BJT as a switch in an automotive circuit is described in accordance with manufacturer specifications and textbook descriptions.

Rangeon and off, high and low resistance.

3.3Common emitter amplifier function is described in terms of signal inversion and application.

3.4Automotive transistor testing procedures are described in accordance with manufacturer specifications.

Rangeforward and reverse junction resistance specifications.

3.5Transistor bias is explained in accordance with manufacturer specifications.

Rangeforward and reverse junction.

3.6Transistor gain is explained in accordance with textbook descriptions.

Rangesingle bipolar, Darlington pair.

Element 4

Demonstrate knowledge of operational amplifier application for automotive circuits.

Performance criteria

4.1Symbols are described in accordance with textbook descriptions.

4.2Amplifier function and operation are described in terms of current gain and application.

Rangeinverting, non-inverting, comparators.

Element 5

Demonstrate knowledge of SCRs and thyristors in automotive circuits.

Performance criteria

5.1Basic SCR operation in automotive circuits is described in accordance with manufacturer specifications.

Rangesymbol, action in ignition circuits and electric motor speed control.

5.2SCR ratings for automotive circuits are described in accordance with manufacturer specifications.

Rangevoltage and current handling.

Element 6

Demonstrate knowledge of sensors and actuators in automotive circuits.

Performance criteria

6.1The kinds of changes that are detected by the sensors are identified in accordance with manufacturer specifications.

Rangechanges in – pressure, temperature, position, fluid level, flow rate, speed (linear and rotary), chemical content of a gas, magnetism.

6.2The most common types of sensor used to detect each kind of change are identified by their method of measuring the change.

Rangepressure, temperature, position, fluid level, flow rate, speed (linear and rotary), chemical, magnetic.

6.3The types of electrical components that are used as actuators are identified and their method of operation described in accordance with manufacturer specifications.

Rangemotors, stepper motors, solenoids, relays.

Please note

Providers must be accredited by NZQA, or an inter-institutional body with delegated authority for quality assurance, before they can report credits from assessment against unit standards or deliver courses of study leading to that assessment.

Industry Training Organisations must be accredited by NZQA before they can register credits from assessment against unit standards.

Accredited providers and Industry Training Organisations assessing against unit standards must engage with the moderation system that applies to those standards.

Accreditation requirements and an outline of the moderation system that applies to this standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The AMAP also includes useful information about special requirements for organisations wishing to develop education and training programmes, such as minimum qualifications for tutors and assessors, and special resource requirements.

Comments on this unit standard

Please contact the NZ Motor Industry Training Organisation (Incorporated) if you wish to suggest changes to the content of this unit standard.

 New Zealand Qualifications Authority 2018