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Elements and Performance Criteria

  1. Prepare to diagnose and repair spark ignition engine management system
  2. Diagnose engine management system
  3. Repair engine management system
  4. Complete work processes
  5. Prepare to diagnose and repair spark ignition engine management system
  6. Diagnose engine management system
  7. Repair engine management system
  8. Complete work processes

Range Statement

This section specifies work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Bold italicised wording, if used in the performance criteria, is detailed below.

Safety requirements must include:

work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for:

using specialised tools and equipment

using appropriate personal protective equipment (PPE)

identifying hazards and controlling risks associated with:

working on vehicle high voltage ignition systems

wearing jewellery while working around high current wiring systems.

working with high pressure petrol fuel systems.



Knowledge Evidence

Individuals must be able to demonstrate knowledge of:

work health and safety (WHS) and occupational health and safety (OHS) requirements relating to diagnosing and repairing spark ignition engine management systems, including procedures for:

using specialised tools and equipment

using appropriate personal protective equipment (PPE)

identifying hazards and controlling risks associated with:

working on vehicle high voltage ignition systems

wearing jewellery while working around high current wiring systems

working with high pressure petrol fuel systems

operating principles of spark ignition engine management systems and associated components, including:

combustion, including:

air-fuel ratios and chemistry of combustion

composition of petrol fuel, including octane rating

indirect and direct fuel injection

application, purpose and operation of spark ignition engine management systems and components, including:

fuel system, including:

fuel filters

fuel pumps

fuel pressure regulators

fuel injectors

electronic control system, including the following system inputs:

throttle position sensors

coolant temperature sensors

oxygen sensors

load sensors and air flow meters

intake air temperature sensors

crankshaft position sensors

camshaft position sensors

battery voltage

accessory load sensors

knock sensors

key features of electronic control units (ECUs), including:

read-only memory (ROM)

programmable read-only memory (PROM)

electronically erasable programmable read-only memory (EEPROM)

random access memory (RAM)

multiplexing

adaptive learning

short-term fuel trim (STFT)

long-term fuel trim (LTFT)

sensor reference voltages and sensor grounds

system outputs, including:

injectors

idle speed control devices

fuel pump relays

engine cooling fans

air conditioning compressor controls

broadband intake manifolds

exhaust gas recirculation solenoid controls

carbon canister purge controls

throttle motor (drive by wire) controls

variable valve timing controls

assembly line diagnostic link (ALDL)

ignition systems and components, including:

spark plugs

ignition leads

ignition coils, including electromagnetic induction

ignition timing, including varying ignition timing according to engine load, speed and knock sensor input

dwell period

ECU control of ignition coil switching and methods of generating timing signals, including:

profile ignition pick-up (PIP) and crankshaft position sensor signals, including inductive pick-up, Hall effect and light emitting diode (LED)

waste spark ignition systems

coil-on-plug ignition systems

integrated ignition systems

diagnostic testing procedures for spark ignition engine management systems, including:

diagnostic flow charts

fuel system testing, including:

low pressure fuel system testing

high pressure fuel system testing

testing electrical systems, including procedures for:

accessing electrical terminals and using test probes without damaging connectors, fuse holders or wiring

injector testing

sensor testing

actuator testing

accessing and interpreting industry-relevant test equipment data, including:

fault codes

live data

freeze frame data

waveforms

repair or replacement procedures for spark ignition engine management systems, including procedures for:

removing and replacing the following electrical or electronic components:

sensors

actuators, including fuel injectors and fuel pumps

adjusting and recalibrating components and associated systems

post-repair testing procedures, including procedures for:

clearing fault codes

assessing engine performance

checking for electrical connector mating.