Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation


Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ injection System
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrosystem
- Ignition system
   Various systems of ignition
   Principle of work of ignition
   Executive body
   System "brain"
   Impulses for the control unit
   Regulation on a detonation
   Security measures at work with ignition system
   Repair of system of ignition
   Diagnostics of system of ignition
   Ignition distributor
   Sensor of detonation combustion
   Elements of a high voltage
   Replacement of spark plugs
   Spark plugs
   Check of the moment of ignition
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications



Diagnostics of system of ignition

Ignition "shutdown" by separation of tips (arrow) on electronic switchboards of coils of ignition, at the left on an example of models with 4-and 5-cylinder engines, on the right on an example of the 6-cylinder engine.


On an illustration the package of coils of ignition of 6-cylinder engines is shown at the removed protection of the engine. Figures on high-voltage sockets specify, to what what cylinder the wire follows a message.


On an illustration check of system of ignition on an iskroobrazovaniye is shown. With a view of safety the candle should be connected electricly to the engine by means of an auxiliary cable that here it is not shown for the sake of the best presentation.

In the photo the coil of ignition of the models equipped with 4-and 5-cylinder engines, with the correct designations of plugs is represented. Drawing shows an arrangement of contacts of the connecting tip at the electronic switchboard (important at checks).


Some models with 4-cylinder engines are equipped with similar transformers of a high voltage. The coil of ignition and the electronic switchboard are incorporated here in one case. And in this case at connections the corresponding designations of plugs are specified, and plugs 1 and 15 become available only after opening of a small lid. On an illustration the three-polar tip is also visible.

The electronic switchboard (shooter) of coils of ignition of the 6-cylinder engine is located at a back wall of a motor compartment. Drawing shows the scheme of an arrangement of contacts of the 4-polar tip. The arrangement of contacts of the 3-polar tip corresponds shown in drawing at the left above (4-and 5-cylinder engines).

Who wants to find malfunction in ignition system, should operate systematically.

 PERFORMANCE ORDER

  1. Usual check of secondary tension it is possible to find out, whether the igniting spark is created in general.
  2. Supply by a food of systems of ignition and injection passes through safety locks 13, 21, 25, 27, 28 and 32 (depending on engine type). At refusal of system of ignition it is necessary to check these safety locks (head Body electrosystem).
  3. Exact visual check of system of ignition helps to find the most frequent causes of failures (faulty wires and tips, electric breakdowns).
  4. Only now it is necessary to check one by one the ignition coil, the sensor of the Hall or the sensor of frequency of rotation or the sensor of the moment of ignition.
  5. If everything did not lead it to success, it is necessary to interrogate memory of the store of malfunctions (in a workshop).

Stock-taking of secondary tension

Directly in the beginning we check, whether the ignition system gives igniting spark:

 PERFORMANCE ORDER

  1. To disconnect a high-voltage wire from a spark plug, to unscrew a candle.
  2. Again to put on a wire a candle and to put it on the block of cylinders so that it had a reliable contact to "weight" (case). Even better – create an electric chain, having connected to the engine a spark plug carving by means of an auxiliary cable for "prikurivaniye".
  3. Ask the assistant to turn the engine a starter.
  4. If there is a powerful spark overlapping on a candle electrode, means, the current in system of ignition is available. Possibly, the main adjustment of ignition (see appropriate section in this chapter) is incorrectly established.
  5. If the iskroobrazovaniye does not occur, repeat check with a candle of other cylinder. In case and there the iskroobrazovaniye is absent, it is necessary to check all system of ignition completely.

Visual check of system of ignition

 PERFORMANCE ORDER

    Whether
  1. all plugs and shtekerny contacts on the ignition coil, the control unit by electronic system of ignition or the control unit ignition and injection and on the ignition distributor are densely fixed?
    2. Whether
  2. any contact in the multicontact tip departed?
    3. Whether
  3. the filling weight flowed out from the ignition coil? In this case it, probably, is faulty.
    4. Whether
  4. is not present on the case of the coil of ignition of cracks or deposit traces from spark breakdowns?
  5. In addition check, whether the main cables and high-voltage wires are reliably soldered and whether their isolation is whole. Modern systems of ignition because of high secondary voltage are more sensitive to breakdowns of a spark and leakages of a current.
    6. Whether
  6. there are damages on a distributor cover? Pay attention first of all to inside!
    7. Whether
  7. all details of system of ignition pure and dry? Damp dirt promotes emergence of electric breakdowns.

 Help: at carrying out described below checks watch connecting and disconnecting measuring and control devices only at the switched-off ignition.

Whether as it should be food of system of ignition?

Along with an ignition system crash because of an absent food too weak tension too can cause serious malfunctions in work! Therefore for check it is necessary to use the voltmeter.

 PERFORMANCE ORDER

    Whether
  1. as it should be safety locks?
  2. Models with 4-and 5-cylinder engines: to separate tips on the electronic switchboard near the ignition coil.
  3. To connect the measuring device to the disconnected tip between contact 1 (plug 15) and contact 3 ("weight").
  4. To include ignition.
  5. Volmetr should show at least 11,5 Century.
  6. If the device does not show absolutely any tension or too weak, means, the reason in conducting to the ignition lock.
  7. The same it is possible to tell about the tip in the car equipped with the so-called transformer of a high voltage.
  8. Models with 4-cylinder engines: to carry out the same measurement at a black-dark blue wire of the control unit system Motronic or Digifant.
  9. Models with the 5-cylinder engine: to carry out the same measurement at a black-dark blue wire of the control unit completely electronic system of ignition.
  10. And in these parts the indicator should make at least 11,5 Century.
  11. Models with the 6-cylinder engine: to separate shtekerny connection of white color at a back wall of a motor compartment (supply by a food of coils of ignition), to connect the measuring device between each of three sockets of the plug 15 in the top part of shtekerny connection and "weight".
  12. To include ignition.
  13. Each measurement should show at least 11,5 Century.
  14. If the device does not show absolutely any tension or too weak, means, the reason in conducting to the ignition lock.
  15. To carry out the same measurement at a black and green cable of the control unit MPI/MPFI system.
  16. And here the indicator should make at least 11,5 Century.

Reasons of malfunctions

 PERFORMANCE ORDER

  1. Indispensable condition: the storage battery is charged, safety locks as it should be.
  2. The ignition lock (head Devices and auxiliary devices) is faulty.
  3. Gap in conducting between the lock of ignition and the central switchboard and between the central switchboard and the coil (ами) ignitions or between the central switchboard and the control unit. To check passing of wires and tips on the basis of electroschemes.

Check of the coil of ignition

Models with 4-and 5-cylinder engines

 PERFORMANCE ORDER

  1. Visual check of the coil of ignition was already carried out.
  2. For resistance check at the switched-off ignition to disconnect all wires from the ignition coil. We measure primary and secondary winding.
  3. To measure an exact ohmmeter resistance between plugs of the coil of ignition 1/-and 15 / +.
  4. Standard resistance: 0,5-1,5 Ohm.
  5. The following measurement between plugs 1/-and 4.
  6. Here the ohmmeter should show 5 — 9 kiloohms.
  7. If the called indicators are not reached, it is necessary to replace the ignition coil.
  8. It is impossible to define short circuit by these measurements between windings. Therefore, if, despite the received good results, all of you equally consider the coil of ignition as the reason of malfunctions, it is necessary to give the removed coil of ignition to a workshop on autoelectrosystems for recheck.

Check of the electronic switchboard

Models with 4-and 5-cylinder engines

It is impossible to check on functioning only separately taken electronic switchboard close to the coil of ignition. Therefore it is necessary to operate as follows:

 PERFORMANCE ORDER

  1. Management check: to separate tips on the electronic switchboard near the ignition coil.
  2. To connect the voltmeter to sockets between contact 2 (management) and contact 3 ("weight").
  3. To turn the engine a starter.
  4. The voltmeter should show at least 2 Century.
  5. To check supply of system of ignition by a food according to already described scheme.
  6. To check the ignition coil, see the following section.
  7. If in system of ignition there is no iskroobrazovaniye in spite of the fact that three called checks did not reveal any malfunctions, means, the electronic switchboard is defective. In this case it is necessary to replace the electronic switchboard complete with the ignition coil.

Transformer of a high voltage

Models with the 4-cylinder engine

In some 4-cylinder models the coil of ignition and the electronic switchboard are assembled in one knot (a tranformator of a high voltage). Connections from the plug 1 and 15 of the coil of ignition are located under a protective cover. Connection on "weight" (case) passes directly through the case. On the image of action the arrangement corresponds to the ignition coil with the electronic switchboard.

Check of the transformer of a high voltage

 PERFORMANCE ORDER

  1. Visual check is carried already out.
  2. For resistance check at the switched-off ignition to separate the trekhshtyrkovy tip and the main high-free wire of the transformer. We measure primary and secondary winding of an element with the coil.
  3. To measure resistance between plugs of the transformer of a high voltage 1/-and 15 / +.
  4. Standard indicator: 0,5–0,7 Ohm.
  5. The following measurement between plugs 15 and 4.
  6. Standard indicators: 3–4 kiloohms.
  7. If the specified indicators are not reached, it is necessary to replace the transformer.
  8. By means of these measurements it is impossible to distinguish short circuit between windings. Therefore, if, despite the received good results, all of you equally consider the transformer of a high voltage as the reason of malfunctions, it is necessary to give the removed transformer to a workshop on autoelectrosystems for recheck.
  9. For tension check you will need the voltmeter, and also auxiliary cables with test щупами.
  10. To attach a measuring cable to both external contacts of the trekhshtyrkovy tip of the transformer of a high voltage.
  11. To include ignition, the voltmeter should show about 12 V.Esli tension is absent, it is necessary to look for a rupture of a cable in positive or negative conducting.
  12. To switch off ignition.
  13. Check of impulses: to disconnect tips of wires from a vpryskny nozzle or from the starting fuel valve and from the holder of cables of vpryskny nozzles.
  14. To connect the light-emitting diode voltmeter by means of auxiliary cables and test щупов to contacts 2 and 3 tips of the transformer.
  15. To ask the assistant to give a starter.
  16. Light-emitting diodes should замерцать. If is not present, means, the reason in the sensor of the Hall or the control unit of system of injection of Mono-Motronic or Digifant is faulty.
  17. To switch off ignition.

Check of coils of ignition

Models with 6-cylinder engines

 PERFORMANCE ORDER

  1. Visual check of coils of ignition was already carried out.
  2. For check of resistance it is necessary to disconnect all high-voltage wires from ignition coils. We check a secondary winding of coils.
  3. To measure an exact ohmmeter resistance between nests of high-voltage wires of system of ignition of the first and sixth cylinders (the first coil).
  4. Standard indicator: 9 — 14 kiloohms.
  5. The same measurement to make between nests of high-voltage wires of the second and fourth cylinders, and also nests of wires of the third and fifth cylinders (the second and third coils).
  6. If everything is all right, on turn check of a secondary winding of coils.
  7. To disconnect shtekerny connection of white color near a back wall of a motor compartment (a food of coils of ignition), to connect the measuring device for choice to one of three contacts of the plug 15 in the top part of shtekerny connection.
  8. To separate the three-polar tip of the electronic switchboard (also near a back wall of a motor compartment) to connect the second wire of an ohmmeter in turn to all three plugs in the tip.
  9. Standard indicator: at all three measurements should be received 0,5 — 1,0 Ohm.
  10. If it not so, it is necessary to replace a package of coils of ignition.

Check of the electronic switchboard

Models with the 6-cylinder engine

 PERFORMANCE ORDER

  1. To remove tips from all six vpryskny nozzles.
  2. To disconnect the 4-polar tip of the electronic switchboard (near a back wall of a motor compartment).
  3. To connect the light-emitting diode voltmeter to "weight".
  4. Free wire of the voltmeter to connect in turn to contacts 1, 3 and 4 disconnected tips.
  5. The assistant each time thus turns the engine a starter.
  6. The light-emitting diode voltmeter should flash at all three measurements, otherwise it is necessary to check management or to replace the electronic switchboard.

Check of the sensor of the Hall

Models with 4-and 5-cylinder engines

 PERFORMANCE ORDER

  1. To disconnect tips of the electronic switchboard near the ignition coil.
  2. To pull together a rubber cap of the tip of the sensor of the Hall (sideways at the ignition distributor) at the connected tip – in order that tip contacts became available.
  3. To connect the voltmeter to the plug 2 (a violet wire) and 3 (a violet-brown wire) the tip.
  4. To include ignition and slowly to turn the engine a hand in order that the punched diaphragm (trigger) of the distributor was turned, entered into the sensor of the Hall and left it.
  5. To watch the measuring device: it should show 0 — 0,5 In if the diaphragm is out of the Hall sensor. When the diaphragm is in the Hall sensor, the indicator should make at least 4 Century.
  6. If there are no impulses, means, it is necessary to check a food of the sensor of the Hall:
  7. To disconnect tips from the distributor and to connect the voltmeter to both external contacts of the tip.
  8. To include ignition, the voltmeter should show now at least 9 Century.
  9. Otherwise the control unit or conducting are faulty.

Check of the sensor of the Hall

Models with the 6-cylinder engine

Plug connections behind in the middle of a motor compartment at model with the 6-cylinder engine

1–for heating right a lambda probe;
2–for the ignition coil (bringing conducting);
3–for a signal a lambda probe (right a lambda probe; shtekerny connection is behind behind fixture);

4–for the sensor of detonation combustion of I;
5–for the sensor of frequency of rotation of a shaft of the engine;
6–for the sensor of the moment of ignition.


 PERFORMANCE ORDER

  1. To disconnect all tips of vpryskny nozzles.
  2. To pull together a rubber cap of the tip behind the Hall sensor (the tip remains connected).
  3. To check the light-emitting diode voltmeter tension existence at the included ignition between tip plugs 1 and 3 (on the tip of the plug are designated).
  4. If there is no tension — to check conducting.
  5. To connect the light-emitting diode voltmeter between plugs 2 and 3.
  6. To ask the assistant to turn the engine a starter.
  7. The light-emitting diode voltmeter should start blinking, in this case the Hall sensor as it should be.

 Help: at malfunction of the sensor of the Hall it is at all unessential to change all distributor. The sensor of the Hall can be got separately.

Check of the sensor of frequency of rotation of a shaft of the engine

Models with 6-cylinder engines

In drawing the arrangement of contacts of the tip of the sensor of frequency of rotation of a shaft of the engine and the ignition moment is shown.

The sensor of frequency of rotation is located over a gear wreath of a flywheel. Its shtekerny connection is directed up to the holder of the tip on a back wall of a motor compartment so it is not so necessary to carry out measurements under the car.

 PERFORMANCE ORDER

  1. To check wire passing from the sensor to the holder on a back wall of a motor compartment, to check reliability of shtekerny connection and isolation on wires.
  2. Electric check with an exact ohmmeter.
  3. To disconnect black three-polar shtekerny connection and to connect an ohmmeter to the sensor between contacts 1 and 2.
  4. The ohmmeter should show 1 kiloohm, otherwise the sensor is faulty.
  5. The third contact is a shielding of a cable.
  6. To connect an ohmmeter for shielding check now between contacts 1 and 3, and also between contacts 2 and 3.
  7. The ohmmeter should show Ohm, otherwise the sensor is faulty.

 Help: further check is a removal of the sensor and cleaning of its face party. Dirt or a zamaslivaniye on this place disturb work. Consider: never remove the holder of the sensor, but only the sensor. If fastenings of the sensor were weakened, it needs to be regulated anew in a workshop the special tool.

Check of the sensor of the moment of ignition

Models with the 6-cylinder engine

The sensor of the moment of ignition is established at the left behind directly in the block of cylinders. To check it follows through gray three-polar shtekerny connection on a back wall of a motor compartment.

Actually check is similar to check of the sensor of frequency of rotation of a shaft of the engine which is described in the previous section.

Control unit check

For the control unit (the electronic system of ignition or ignition and injection system) does not exist any method of check in usual sense of this word. However you can find a cause of defect after poll of memory of the store of malfunctions (undressed Regular servicing). The control unit of electronic system of ignition is located under the right covering of foot space of the forward passenger. For removal it is necessary to turn out fixing screws and to delay a covering down.