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      Application of an oscillograph for supervision of performance data of a control system
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Kia Sportage>> Power supply systems, managements of the engine/decrease of toxicity of the fulfilled gases and release of the fulfilled gases>> Control systems of the engine and decrease in toxicity of the fulfilled gases>> Application of an oscillograph for supervision of performance data of a control system

Application of an oscillograph for supervision of performance data of a control system

The general information

Digital multimeters perfectly approach for check of the electric chains which are in a static condition, and also for fixing of slow changes of traced parametres. At carrying out of the dynamic checks which are carried out on the working engine, and also at revealing of the reasons of sporadic failures by absolutely irreplaceable tool there is an oscillograph.

Some oscillographs allow to keep oscillograms in the built in module of memory with the subsequent conclusion of results to the press or their swapping to the carrier of the personal computer already in stationary conditions.

The oscillograph allows to observe periodic signals and to measure pressure, frequency, width (duration) of rectangular impulses, and also levels of slowly varying pressure. The oscillograph can be used at performance of following procedures:

  • Revealings of failures of astable character;
  • Checks of results of the made corrections;
  • Monitoring of activity of a ljambda-probe of a control system of the engine equipped каталитическим with the converter;
  • The analysis of the signals developed by a ljambda-probe which deviation of parametres from norm is unconditional the certificate of infringement of serviceability of functioning of a control system as a whole. On the other hand, correctness of the form of impulses given out by the gauge can serve as a reliable guarantee of absence of infringements in a control system.

Reliability and simplicity of operation of modern oscillographs do not demand any special special knowledge and experience from the operator. Interpretation of the received information can be easily made by elementary visual comparison of the oscillograms removed during check with the time dependences resulted more low typical for various gauges and actuation mechanisms of automobile control systems.

Parametres of periodic signals

The general data

Each signal removed by means of an oscillograph, can be described by means of the following key parametres:

  • Amplitude: the Difference of the maximum and minimum pressure () a signal within the period;
  • The period: Duration of a cycle of a signal (мс);
  • Frequency: Quantity of cycles in a second (Hz);
  • Width: Duration of a rectangular impulse (мс, мкс);
  • Porosity: the Relation of the period of repetition to width (In foreign terminology return is applied porosity parametre named a running cycle, expressed in %);
  • The signal form: Sequence of rectangular impulses, individual emissions, a sinusoid, sawtooth impulses, etc.
Characteristics of any signal.

Usually characteristics of the faulty device strongly differ from reference that allows the skilled operator easily and quickly to reveal the refused component by the analysis of the corresponding oscillogram.

Direct current signals

Unique performance data of such signals is pressure.

The gauge of temperature of a cooling liquid of the engine (ECT).
The gauge of temperature of soaked up air (IAT).
The gauge of position throttle заслонки (TPS).
Warmed up ljambda-probe.
Measuring instrument of the volume expense of a stream of air (VAF).
The gauge of position throttle заслонки (TPS).

Alternating current signals

The basic characteristics of the given signals are the amplitude, frequency and the signal form.

The detonation gauge (KS).
The inductive gauge of turns of the engine.

The frequency-modulated signals (ЧМ)

Performance data of the frequency-modulated signals are the amplitude, frequency, the form of a signal and width of periodic impulses.

Sources ЧМ of signals are devices.

The inductive gauge of position of a cranked shaft (CKP).
The inductive gauge of position of a camshaft (CMP).
The inductive gauge of speed of movement of the car (VSS).
Working on effect of the Hall gauges of turns and position of shaft.
Optical gauges of turns and position of shaft.
Digital gauges of thermometric measurement of weight of air (MAF) and absolute pressure in the inlet pipeline (MAP).

The signals modulated on width of an impulse (ШИМ)

Performance data of signals of pulse-width modulation (ШИМ) are the amplitude, frequency, the form of a signal and porosity of periodic impulses.

Sources of signals ШИМ are the presented devices.

Fuel injectors.
Devices of stabilisation of turns of idling (IAC).
Primary winding of the coil of ignition.
The electromagnetic valve of a purge of a coal adsorber (EVAP).
System valves рециркуляции the fulfilled gases (EGR).

The coded sequence of rectangular impulses

Performance data are the amplitude, frequency and the form of sequence of separate impulses.

This sort of signals are generated by the module of memory of self-diagnostics ECM of a control system of the engine.

By the analysis of width and the form of impulses, and also calculation of their quantity in each of groups can be считаны codes of malfunctions stored in memory (a code 1223).

Signal of a code of malfunction of the module of self-diagnostics of a control system of the engine (a code 1223).

The amplitude and the signal form remain the constants, the written down value will stand out until memory of the module will not be cleared.

Interpretation of oscillograms

The form of a signal given out by an oscillograph depends on set of various factors and can change appreciably. In a kind told before to start replacement of a suspected component in case of discrepancy of the form of the removed diagnostic signal with the reference oscillogram, it is necessary to analyse carefully received результа.

Digital signal.
Analogue signal.

Pressure

Zero level of a reference signal cannot be considered as absolute basic value, - "zero" of a real signal, depending on concrete parametres of a checked chain, it can appear shifted concerning reference ([1] - the Digital signal see an illustration) within a certain admissible range.

The full amplitude of a signal depends on pressure of a food of a checked contour and also can vary in certain limits concerning reference value ([3] - the Digital signal see an illustration and [2] - the Analog signal see an illustration).

In chains of a direct current the range of change of a signal is limited to pressure of a food. As an example it is possible to result a chain of system of stabilisation of turns of idling (IAC) which alarm pressure does not change in any way with change of turns of the engine.

In chains of an alternating current the amplitude of a signal already unequivocally depends on frequency of operation of a source of a signal so, the amplitude of the signal which is given out by the gauge of position of a cranked shaft (CKP) will increase with increase of turns of the engine.

In a kind told if the amplitude of a signal removed by means of an oscillograph appears excessively low or high (up to trimming of top levels), it is enough to switch only a working range of the device, having passed to a corresponding scale of measurement.

At check of the equipment of chains with electromagnetic management (for example, system IAC) at food switching-off pressure throws ([4] - the Digital signal see an illustration) which at the analysis of results of measurement can be ignored easy can be observed.

It is not necessary to worry also at occurrence of such deformations of the oscillogram, as скашивание the bottom part of forward front of rectangular impulses ([5] - the Digital signal see an illustration) if, of course, the fact выполаживания front is not a sign of infringement of serviceability of functioning of a checked component.

Frequency

Frequency of repetition of alarm impulses depends on working frequency of a source of signals.

The form of a removed signal can be edited and led to a kind convenient for the analysis by switching on an oscillograph of scale of time development of the image.

At supervision of signals in alternating current chains time development of an oscillograph depends on frequency of a source of a signal ([3] - the Analog signal see an illustration), defined by engine turns.

As already it was told above, for signal reduction to a legible kind it is enough to switch scale of time development of an oscillograph.

In certain cases the signal oscillogram appears developed mirror concerning reference dependence that speaks реверсивностью polarity of connection of a corresponding element and, in the absence of an interdiction for change of polarity of connection, can be ignored at the analysis.

Typical signals of components of control systems of the engine

Modern oscillographs are usually equipped only by two alarm wires together with a set various щупов, allowing to carry out device connection practically to any device.

The red wire is connected to a positive pole of an oscillograph and usually connected to the plug of the electronic module of management (ECM). The black wire should be connected to reliably earthed point (weight).

Injection injectors

Management of structure of an air-fuel mix in modern automobile electronic systems of injection of fuel is carried out by timely updating of duration of opening of electromagnetic valves of injectors.

Duration of stay of injectors abroach is defined by duration developed by the module of management of the electric impulses submitted on an input of electromagnetic valves. Duration of impulses is measured in milliseconds and usually does not fall outside the limits a range 1 14 мс.

Impulse of management of opening of an injector of injection of fuel.

Often on the oscillogram it is possible to observe also a series of the short pulsations following directly behind the initiating negative rectangular impulse and supporting the electromagnetic valve of an injector abroach, and also the sharp positive throw of pressure accompanying the moment of closing of the valve.

Serviceability of functioning ECM can be checked easily up by means of an oscillograph by visual supervision of changes of the form of an operating signal at a variation of working parametres of the engine. So, duration of impulses at проворачивании the engine on single turns should be a little above, than at unit work on low turns. Increase of turns of the engine should be accompanied by respective increase in time of stay of injectors abroach. The given dependence is especially well shown at opening throttle заслонки by short pressing a gas pedal.

 PERFORMANCE ORDER

  1. By means of thin щупа from a set applied on an oscillograph connect a red wire of the device to инжекторной to plug ECM of a control system of the engine. Щуп the second alarm wire (black) oscillograph reliably earth.
  2. Analyse the form read out during time проворачивания the signal engine.
  3. Having started the engine, check up the form of an operating signal on single turns.
  4. Sharply having pressed a gas pedal, lift frequency of rotation of the engine to 3000 rpm, - duration of operating impulses at the moment of an acceleration should increase considerably, with the subsequent stabilisation at level equal, or hardly smaller peculiar to idling turns.

Fast closing throttle заслонки should lead to the flattening of the oscillogram confirming the fact перекрывания of injectors (for systems with отсеканием fuel givings).

At cold start the engine requires some enrichment of an air-fuel mix that is provided with automatic increase in duration of opening of injectors. In process of warming up duration of operating impulses on the oscillogram should be reduced continuously, gradually coming nearer to value typical for single turns.

In injection systems in which the injector of cold start is not applied, at cold start of the engine the additional operating impulses shown on the oscillogram in the form of pulsations of variable length are used.

In the table resulted more low typical dependence of duration of operating impulses of opening of injectors on a working condition of the engine is presented.

Engine condition

Duration of an operating impulse, мс

Single turns 1 6
2000 3000 rpm 1 6
Full gas 6 35

Inductive gauges

 PERFORMANCE ORDER

  1. Start the engine and compare the oscillogram removed from an exit of the inductive gauge from the reference.
The typical oscillogram of the signal developed by the inductive gauge.
  1. The increase in turns of the engine should be accompanied by increase in amplitude of a pulse signal developed by the gauge.

The electromagnetic valve of stabilisation of turns of idling (IAC)

In motor industry electromagnetic valves IAC of set of the various types which are giving out signals also of the various form are used.

The general distinctive feature of all valves is that fact that porosity of a signal should decrease with loading increase for the engine, connected with inclusion of additional consumers of the capacity causing fall of turns of idling.

If porosity of the oscillogram changes with loading increase, however at inclusion of consumers infringement of stability of turns of idling takes place, check up a condition of a chain of the electromagnetic valve, and also correctness given out ECM a command signal.

Usually in chains of stabilisation of turns of idling the 4-polar step-by-step electric motor which description is resulted more low is used. Check of 2-contact and 3-contact valves IAC is made in a similar manner, however oscillograms of alarm pressure given out by them are absolutely unlike.

The step-by-step electromotor, reacting on given out ECM a pulsing operating signal, makes step updating of turns of idling of the engine according to working temperature of a cooling liquid and current loading on the engine.

Levels of operating signals can be checked up by means of an oscillograph, measuring щуп which is connected serially to each of four plugs of the step-by-step motor.

 PERFORMANCE ORDER

  1. Warm up the engine to normal working temperature and leave its working on single turns.
  2. For increase in loading at the engine include head headlights, air conditioner, or, - on models with the wheel hydraulic booster, - turn a steering wheel. Idling turns should fall to short time, however there and then again to be stabilised at the expense of valve IAC operation.
  3. Compare the removed oscillogram to the reference.
The oscillogram of an operating signal of system of stabilisation of turns of idling (IAC).

Ljambda-probe (the oxygen gauge)

In section the oscillograms typical for ljambda-probes most often applied on cars циркониевого of type in which basic pressure 0.5В is not used are resulted. Recently the increasing popularity is got by titanic gauges, the working which range of a signal makes 0 5 In, and high level of pressure stands out at combustion of the impoverished mix, low, - enriched.


 PERFORMANCE ORDER

  1. Connect an oscillograph between the ljambda-probe plug on ECM and weight.
  2. Make sure that the engine is heated-up to normal working temperature.
  3. Compare the oscillogram displayed a measuring instrument to reference dependence.
The oscillogram of the signal which is given out by a typical ljambda-probe.
  1. If the removed signal is not wavy, and represents linear dependence, that, depending on pressure level, it testifies to excessive repauperization (0 0.15В), or reenrichment (0.6 1В) an air-fuel mix.
  2. If on single turns of the engine the normal wavy signal takes place, try to squeeze out sharply some times педель gas, - signal fluctuations should not fall outside the limits a range 0 1В.
  3. The increase in turns of the engine should be accompanied by increase of amplitude of a signal, reduction - decrease.

The detonation gauge (KS)

 PERFORMANCE ORDER

  1. Connect an oscillograph between the plug of the gauge of detonation ECM and weight.
  2. Make sure that the engine is heated-up to normal working temperature.
  3. Sharply squeeze out a pedal of gas and compare the form of a removed signal of an alternating current to the reference oscillogram.
The oscillogram of the signal which is given out by the typical gauge of a detonation (KS).
  1. At insufficient image sharpness slightly knock on the block of cylinders around placing of the gauge of a detonation.
  2. If to achieve unambiguity of the form of a signal it is not possible, replace gauge KS, or check up a condition of electroconducting of its chain.

Ignition signal on an exit of the amplifier of ignition

 PERFORMANCE ORDER

  1. Connect an oscillograph between the plug of the amplifier of ignition ECM and weight.
  2. Warm up the engine to normal working temperature and leave its working on single turns.
  3. On the oscillograph screen the sequence of rectangular impulses of a direct current should stand out. Compare the form of an accepted signal to the reference oscillogram, paying steadfast attention to coincidence of such parametres, as amplitude, frequency and the form of impulses.
The oscillogram of an operating signal of the amplifier of ignition.
  1. At increase in turns of the engine frequency of a signal should increase in direct ratio.

Primary winding of the coil of ignition

 PERFORMANCE ORDER

  1. Connect an oscillograph between the plug of the coil of ignition ECM and weight.
  2. Warm up the engine to normal working temperature and leave its working on single turns.
  3. Compare the form of an accepted signal to the reference oscillogram, - positive throws of pressure should have constant amplitude.
The signal oscillogram on the plug of a primary winding of the coil of ignition.
  1. Non-uniformity of throws can be caused excessive resistance of a secondary winding, and also malfunction of condition ВВ of a wire of the coil or a candle wire.