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Auto-diagnosis in electronic injection systems EOBD. Study of the sensors, power units and actuators applied to the car


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By means of connecting the ADA303 application sensors and the ADA305 actuators to the UCE ADA304, the injection system of a basic atmospheric or turbo engine can be simulated. Then, in this engine we can observe, through the auto-diagnosis DD-Car, how the engine parameters process is changing in a real time.

One of the main features of this set of equipments is that it can be adapted to all the formative requirements and needs, as required. On one hand, the individual acquisition of each equipment allows us to work and study each group of components on an individual basis; ADA 303 study of the sensors, ADA 304 study of the control unities with auto-diagnosis and ADA 305 study of the car actuators. Developing in each case the analysis abilities, checking and diagnosis.

The acquisition of the three equipments, in which all the components are accessible and very easy to recognize (sensors, UCE, actuators), and where the student himself will have to assemble and operating the fuel injection system in an interconnected way, carrying out manually the electrical-electronical association of all the components required (sensors, UCE, actuators). So that the student is a very active element in the learning process, aware at every moment of the steps he has to carry out to make the system operate correctly, so that the student himself checks very rapidly, directly and visually the work he has done.

A very important point to underline is that the student will be able to carry out a very fast and real introduction to the auto-diagnosis through the DD-CAR software, seeing in real time the variation of the parameters of the sensors, the reading and deleting of the breakdown code, the activating, programming and basic adjustments, all of which controlled by the current EOBD norm. The work with DD-CAR will allow that the student get accustomed with the running of auto-diagnosis consoles of the market, so that he can adapt to any one of them very rapidly after having worked with the above-mentioned software.

Technical characteristics

  • Set of equipments that allows working with real or simulated sensors applied to the current car, making possible a rapidly and visually observation of the running as a whole of many electrical-electronical components of a generic injection system (fuel or current diesel).
  • Sensor and actuator communication with the ECU by different types of signal; analogue, digital, multiplexing buses CAN and LIN.
  • Testing points protected against possible incorrect manipulations, for carrying out measurements at the different points of the circuit.
  • Possibility of generating malfunctions in the signal sent by the sensors to the ECU.
  • Reprogramming function (Flash) of the ECU as a Turbo motor or Atmospheric.
  • Auto-diagnosis function implemented in the ECU.
  • Possibility of disconnecting the sensors/actuators simulated in the panel and of connecting the real sensors/ actuators of the ADA303 and ADA305 applications.
  • Measurements: 446 x 270 x 100 mm.

Skills to be developed

  • Analysis of the functioning of the different sensors and their association in the different automobile systems.
  • Testing electrical/electronic signals without voltage and under voltage.
  • Diagnosis of faults in the sensors: Lack of supply, broken sensor, short circuit to mass or to positive of the sensor, failure in the bus of communication of the sensor (CANLIN) etc.
  • Analysis of how the electronic injection control unit works on an ECU-Motor.
  • Analysis of the ECU input signals.
  • Analysis of the ECU output signals.
  • Handling of auto-diagnosis tools: DD-Car.
  • Testing of sensors and actuators using an auto-diagnosis tool.
  • Instrumentation handling: Oscilloscope, Polymeter.

Equipment composition

  • Sensor application, ADA303.
  • ECU application, ADA304.
  • Actuator application, ADA305.
  • User manual.
  • Practise activity manual.

Contents to be studied

  • Technologies used in the sensor design.
  • Types and characteristics of sensors.
  • ECU Sensor inputs: types, characteristics, etc.
  • Technologies used in the actuator design.
  • Types and characteristics of actuators.
  • Actuator outputs from the ECU: types, characteristics, etc.
  • Internal architecture of an electronic control unit.
  • Working of an electronic injection control unit, injection control algorithms.
  • Injection time and ignition time (ignition angle and DWELL angle).
  • Types and characteristics of sensor/actuator signals: Analogue, digital, multiplexing buses (CAN and LIN).
  • Auto-diagnosis in electronic injection systems, failure EOBD codes.
  • Reprogramming (Flash) of the electronic control unit.
  • Digital /Analogue and Analogue/ Digital conversion.


DD-Car is a Diagnosis Teaching Tool prepared to work with the ADA304. Working with DD-Car will allow the student to become familiar with the operation of auto-diagnosis consoles on the market allowing their adaptation to any of them to be quicker and easier, in addition testing can be carried out without the risk entailed on working directly on the systems of the vehicles.

The following functions can be made:

  • Reading and deleting the breakdown code.
  • Reading of values and analysis in real time of the operation of the system.
  • Activation of the actuators.
  • ECU Programming (flash).
  • Carrying out basic adjustments in the system.

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