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Title / Inspect, diagnose, and rectify faults in engine management systems
Level / 4 / Credits / 6
Purpose / This unit standard is for people in the automotive industry. People credited with this unit standard are able to inspect and diagnose engine management problems; and rectify faults in an engine management system.
Classification / Motor Industry > Automotive Electrical and Electronics
Available grade / Achieved
Guidance information
1 Legislation relevant to this unit standard includes but is not limited to – Health and Safety in Employment Act 1992; Land Transport Rule: Vehicle Repair 1998, Rule 34001.
2 Land Transport Rules are produced for the Minister of Transport by Land Transport New Zealand. These rules are available online at http://www.landtransport.govt.nz/rules/.
3 Definitions
Service information may include but is not limited to – technical information of a vehicle, machine, or product detailing operation; installation and servicing procedures; manufacturer instructions and specifications; technical terms and descriptions; and detailed illustrations. This can be accessed in hard copy or electronic format and is normally sourced from the manufacturer.
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 in a professional and competent manner with due regard to safe working practices.
4 It is recommended that people hold credit for Unit 24090, Demonstrate knowledge of diagnosing faults in engine management systems; and Unit 5459, Demonstrate knowledge of automotive electronic fuel injection system operation, and fault diagnosis and repair; or demonstrate equivalent knowledge and skills.
Outcomes and performance criteria
Outcome 1
Inspect and diagnose engine management problems.
Performance criteria
1.1 Safe working practices and service precautions are observed throughout the task in accordance with service information and legislative requirements.
Range personal safety, safety of others, vehicle or machine safety, workshop safety, environmental safety, tools and equipment safety;
service precautions may include but are not limited to – high-voltage electrical systems.
1.2 The symptoms of the problem stated are confirmed in accordance with service information.
Range customer information, trouble-shooting charts, testing the vehicle.
1.3 The engine management system and the engine compartment are checked visually to ensure no obvious faults exist in accordance with service information.
Range includes but is not limited to – loose and leaking fuel and coolant pipes and hoses, loose and disconnected wires and connectors, low fluid levels, loose and missing drive belts, any other loose and broken components.
1.4 Suitable test equipment is selected and used to enable faults to be diagnosed in accordance with service information.
1.5 No damage is caused to circuit components and electronic devices when using test instruments in accordance with service information.
1.6 The activation routine for the self-diagnostic system is carried out in accordance with service information.
1.7 The faulty subsection is isolated in accordance with service information.
Range includes but is not limited to – air, fuel, sensors, control, voltage supply and return.
1.8 Circuits not monitored by a self-diagnostic system are tested, and any faults are located and identified in accordance with service information.
1.9 Fuel injection operation is tested to determine the nature of any faults in accordance with service information.
Range tests may include but are not limited to – adjustments, noise, leakage, pulse, fuel pressure and volume.
1.10 Exhaust emissions and engine speed are measured at normal operating temperature and the results noted in accordance with service information.
1.11 The results of the tests and observations are noted and compared with vehicle specifications, and analysed to locate and identify the cause of any fault in accordance with service information.
Outcome 2
Rectify faults in an engine management system.
Performance criteria
2.1 Safe working practices and service precautions are observed throughout the task in accordance with service information and legislative requirements.
Range personal safety, safety of others, vehicle or machine safety, workshop safety, environmental safety, tools and equipment safety;
service precautions may include but are not limited to – high-voltage electrical systems.
2.2 Suitable tools and equipment are used to enable system faults to be rectified in accordance with service information.
2.3 Service precautions are carried out to prevent damage to electronic components in accordance with service information.
2.4 Faults and their causes are corrected by repair, replacement, or adjustment as specified by service information, to enable normal engine management system operation to be restored.
2.5 Self-diagnostic test codes are cleared and subsequent upgrades installed in accordance with service information.
2.6 Road test is performed under controlled conditions of customer complaint to confirm faults have been rectified.
Replacement information / This unit standard was replaced by unit standard 31048.This unit standard and unit standard 24090 replaced unit standard 892, unit standard 961, and unit standard 5460.
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 / 25 January 2008 / 31 December 2020
Review / 2 / 1 March 2018 / 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 / Ó New Zealand Qualifications Authority 2018 / / New Zealand Qualifications Aut