NZQA Expiring unit standard
15375 version 6
Page 1 of 5
Title
Diagnose and repair faults in electronically controlled systems used
on heavy vehicles and machines
Level
4
Credits
8
Purpose
This unit standard is for people in the automotive heavy
engineering industry. People credited with this unit standard
are able to demonstrate knowledge of: electronic components
used in automotive heavy engineering applications; sensors
and actuators used in automotive electronic control systems;
automotive electronic control systems; and test an
electronically controlled system for faults, and rectify faults in
an electronically controlled system.
Classification
Motor Industry > Automotive Electrical and Electronics
Available grade
Achieved
Explanatory notes
1
The following legislation must be consulted and followed where applicable:
– Health and Safety in Employment Act 1992.
2
Reference to suitable tools and equipment means industry approved tools and
equipment that are recognised within the industry as being the most suited to
complete the task to a professional and competent manner with due regard to safe
working practices.
3
For this unit standard it is essential that the practical assessment evidence is
obtained from commercial jobs in the workplace under normal workplace conditions.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of electronic components used in automotive heavy engineering
applications.
Range
includes but is not limited to – resistors, thermistors, capacitors, diodes, light
emitting diodes, transistors, silicon controlled rectifiers, integrated circuits,
microprocessors.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
15375 version 6
Page 2 of 5
Evidence requirements
1.1
Components are recognised in their discrete form, and their rating and polarity
are identified with access to charts.
1.2
The function and a common use for each of the components are identified.
1.3
The circuit symbol for each of the components is sketched.
Outcome 2
Demonstrate knowledge of sensors and actuators used in automotive electronic control
systems.
Evidence requirements
2.1
The kinds of changes that are detected by the sensors are identified.
Range
2.2
The most common types of sensor used to detect each kind of change are
identified by their method of measuring the change.
Range
2.3
may include but is not limited to – pressure, temperature, position,
fluid level, rate of flow, speed (linear and rotary), chemical.
Types of electrical components that are used as actuators are identified and
their method of operation is described according to the manufacturers’
workshop manual descriptions.
Range
2.4
changes in – pressure, temperature, position, fluid level, rate of
flow, speed (linear and rotary), chemical content of a gas.
motors, stepper motors, solenoids, relays.
Method of testing each kind of sensor and actuator is described according to
the manufacturers’ specifications.
Outcome 3
Demonstrate knowledge of automotive electronic control systems.
Evidence requirements
3.1
The difference between closed and open loop control systems is defined in
general terms.
3.2
The purpose and function of a fail safe, and a limp home system are described
according to the manufacturers’ workshop manual descriptions.
3.3
The purpose and function of a self-test system are described according to the
manufacturers’ workshop manual descriptions.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
15375 version 6
Page 3 of 5
3.4
A method that can be used to reliably determine the serviceability of the
electronic control unit, without damaging the unit, is determined.
3.5
Precautions when testing electronic circuits are described according to the
manufacturers’ workshop manual descriptions.
Range
3.6
may include but is not limited to – using compatible equipment,
disconnecting and connecting circuits and plugs, access point
location, pin connection and wiring damage, unsealing and
sealing, retaining circuit memory, control unit isolation.
Precautions to prevent damage to components when repairing, replacing, and
adjusting electronic controlled systems are identified.
Range
may include but is not limited to – obtaining specifications and
instructions, using compatible equipment, isolating components,
cleanliness, screening, earthing, control unit memory retention.
Outcome 4
Test an electronically controlled system for faults.
Range
may include but is not limited to control systems fitted to – engines,
transmissions, hydraulic equipment, brakes, self-levelling devices.
Evidence requirements
4.1
Safe working practices are observed throughout the task.
Range
personal safety, safety of others, safe operation of test equipment,
vehicle and machine safety, safe working practices to prevent
damage to circuits and components.
4.2
Suitable equipment is selected and used to enable testing to be carried out.
4.3
The self-test codes are activated, read, and interpreted, with reference to the
manufacturer's literature, and any faulty circuit is identified.
Range
systems having a self-test feature.
4.4
Cause(s) of identified faulty electronically controlled system circuits are located
on the vehicle by following the vehicle and machine manufacturers’ instructions
and specifications.
4.5
No physical or electrical damage is caused to circuit components or electronic
devices.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
15375 version 6
Page 4 of 5
Outcome 5
Rectify faults in an electronically controlled system.
Evidence requirements
5.1
Safe working practices are observed throughout the task.
Range
personal safety, safety of others, safe operation of test equipment,
vehicle and machine safety, safe working practices to prevent
damage to circuits and components.
5.2
Suitable tools and equipment are selected and used to rectify faults.
5.3
Faults in electrical connections are rectified to restore good conductivity, and
protect against further corrosion.
may include but is not limited to – cleaning by manufacturer's
approved methods, repair or replacement of connections,
positioning and security of wiring and plugs.
Range
5.4
Component faults are rectified by repair and/or replacement according to the
vehicle and machine manufacturers’ instructions and specifications.
may include but is not limited to – sensors, actuators, wiring,
electronic control module (ECM).
Range
Replacement information
This unit standard has been replaced by unit standard
24131 and unit standard 24134.
This unit standard is expiring. Assessment against the standard must take place by
the last date for assessment set out below.
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
23 February 1999
31 December 2016
Revision
2
16 April 2003
31 December 2016
Review
3
16 December 2004
31 December 2016
Review
4
25 January 2008
31 December 2016
Rollover
5
19 November 2010
31 December 2016
Rollover
6
18 February 2016
31 December 2020
Consent and Moderation Requirements (CMR) reference
0014
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
15375 version 6
Page 5 of 5
Please note
Providers must be granted consent to assess against standards (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 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.
Consent requirements and an outline of the moderation system that applies to this
standard are outlined in the Conesnt 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.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016