NZQA registered unit standard
17373 version 4
Page 1 of 4
Title
Demonstrate knowledge of heavy motor vehicle systems and
components
Level
3
Purpose
Credits
5
This unit standard is for people in transport-related occupations
who require an operational knowledge of heavy motor vehicle
systems and components.
People credited with this unit standard are able to locate the
primary systems of a heavy motor vehicle and explain their
basic functions; and identify principal components of primary
systems and explain their basic functions.
Classification
Commercial Road Transport > Commercial Road Transport
Skills
Available grade
Achieved
Explanatory notes
1
Definitions
ABS means anti-lock braking system.
EBS means electronic braking system.
Explain in terms of basic functions means to make clear, verbally, in writing, or by
selection, the essential purpose (of the system or the component).
Hub and stub axle assembly includes front wheels and tyres.
Load sensing is a means (mechanical, electronic and/or pneumatic) of proportioning
air pressure to heavy vehicle braking systems to reflect load mass over individual
axles or axle groups.
Principal means most important.
Primary system means a system that is crucial to the operation of the vehicle.
Stability control relates to the ability of an electronic braking system to sense
excessive lateral acceleration and automatically apply brakes to counter that
acceleration.
2
Reference material
Professional Skills for Driving Trucks, Wellington, NZ Motor Industry Training
Organisation (Incorporated), 2009. Available from NZ Motor Industry Training
Organisation (Incorporated) and public libraries.
NZ Motor Industry Training Organisation
(Incorporated) (MITO)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
17373 version 4
Page 2 of 4
Outcomes and evidence requirements
Outcome 1
Locate the primary systems of a heavy motor vehicle and explain their basic functions.
Evidence requirements
1.1
Primary systems of a heavy motor vehicle are located and explained in terms of
basic functions.
Range
engine, cooling system, fuel and air supply system, exhaust
system, drivetrain, braking system, steering system, electrical
system, suspension system, retardation system(s), emission
control system.
Outcome 2
Identify principal components of primary systems and explain their basic functions.
Evidence requirements
2.1
Principal engine components are identified and explained in terms of basic
functions.
Range
2.2
Principal cooling system components are identified and explained in terms of
basic functions.
Range
2.3
water pump and drive, radiator, coolant hoses, thermostat, fan
assembly, water jacket.
Principal fuel and air supply system components are identified and explained in
terms of basic functions.
Range
2.4
engine block, cylinder head, sump, valve train, crankshaft,
flywheel, piston and connecting rod assemblies.
fuel tank, fuel lines, fuel filters, fuel pump, injector pump or
electronic control module, injectors, air filter, intercooler, inlet
manifold;
one of – turbocharger, supercharger.
Principal exhaust system components are identified and explained in terms of
basic functions.
Range
exhaust manifold, exhaust pipes, exhaust silencer, emission
control.
NZ Motor Industry Training Organisation
(Incorporated) (MITO)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
2.5
Principal drivetrain components are identified and explained in terms of basic
functions.
Range
2.6
chassis rails, cross members, gussets.
Principal suspension system components are identified and explained in terms
of basic functions.
Range
2.11
battery, alternator, starter motor, wiring loom, lighting, circuit
protection;
may include – electronic control units.
Principal chassis components are identified and explained in terms of basic
functions.
Range
2.10
power steering reservoir, steering wheel, steering column, steering
box, steering linkages, power steering pump, power steering
hoses, hub and stub axle assembly.
Principal electrical system components are identified and explained in terms of
basic functions.
Range
2.9
foot valve assembly, brake lines, brake assemblies, park brake
control, air compressor, brake chambers, spring brakes, air
reservoirs;
may include – ABS, EBS, load sensing, stability control.
Principal steering system components are identified and explained in terms of
basic functions.
Range
2.8
clutch, clutch brake, gearbox, drive shafts, differential, axles or half
shafts, wheels;
may include – differential lock and/or power divider, transfer case.
Principal air brake system components are identified and explained in terms of
basic functions.
Range
2.7
17373 version 4
Page 3 of 4
leaf spring, air bag, suspension mounts, shock absorbers, torsion
bars.
Common auxiliary braking systems are identified and explained in terms of
basic functions.
Range
Planned review date
exhaust brake, engine brake, driveline retarder.
31 December 2019
NZ Motor Industry Training Organisation
(Incorporated) (MITO)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
17373 version 4
Page 4 of 4
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
23 February 2000
31 December 2017
Review
2
22 March 2005
31 December 2017
Review
3
22 October 2010
31 December 2017
Review
4
16 April 2015
N/A
Consent and Moderation Requirements (CMR) reference
0092
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR 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) (MITO)
info@mito.org.nz if you wish to suggest changes to the content of this unit standard.
NZ Motor Industry Training Organisation
(Incorporated) (MITO)
SSB Code 101542
 New Zealand Qualifications Authority 2016