Daewoo Nexia

since 1994 of release

Repair and car operation

Deu Neksiya
+ Maintenance instruction
+ Maintenance
+ Engine
+ 3. Engine (two top camshafts)
+ cooling System
+ Toplevnaya and exhaust systems
+ Electric chain
+ 7. Ignition system
- 8. Electronic control unit and sensors
   + 8.2. Sensors
+ Transmission
+ 10. Five-speed transmission and main RPO MM5 broadcast
+ 11. Automatic Transmission
+ Steering
+ Running gear
+ 14. Forward suspension bracket
+ 15. Drive of forward wheels
+ 16. Back suspension bracket
+ Brake system
+ Body
+ Heating, ventilation
+ Electric equipment


8. Electronic control unit and sensors

8.1. Electronic control unit


Electronic control unit (EBU)


The electronic control unit (EBU) is located behind the upholstery panel on the right side of car salon. EBU is a basic element of system of injection of fuel. EBU constantly receives signals from various sensors and exercises administration of the major systems and engine knots. Besides, EBU carries out functions of diagnostics of malfunctions of systems and engine knots. At detection of any malfunction of EBU includes a signaling device "Engine servicing" is required, defines and brings the corresponding code (codes) of malfunction in memory. It facilitates further carrying out problem diagnostics. On the car IEFI-6 type EBU is established. At refusal of EBU replaces ся assembled as does not contain maintainable elements. Parameters and algorithms of management are stored in the erased programmed constant I remember the shchy device (СППЗУ). The version of the program which has been written down in ROM, is designated by number EBU which corresponds to identification number of the car.

EBU carries out a food of various sensors and switches constant tension of 5 and 12 Century. Electric chains of EBU possess high resistance therefore at connection of plugs of a food with a control lamp the last does not burn.

It is necessary to apply the digital voltmeter to exact measurement of supply voltage with high full resistance (10 megohms). EBU operates work топливнык nozzles, the idling valve, compressor coupling etc. by means of special electronic devices (the 4th channel drivers), the target managing directors of signals of EBU intended for processing.

EBU is executed by the unattended. Therefore at EBU refusal it is subject to replacement assembled.


At replacement of EBU, ycтановленного at plant, it is necessary to transfer a code and serial number of old EBU on the plate of new EBU. It is not necessary to make entry on the EBU case. This information can be demanded in further operation of the car.

In order to avoid EBU failure etc.), it is necessary to carry out any operations connected with switching of wires of a food of EBU, for example, accession or shutdown of EBU sockets, a safety lock, wires of the storage battery, lengthening wires only at the switched-off ignition.

To remove or disconnect

1. Negative wire of the battery.
2. The panel closing EBU.
3. To take out EBU from a nest and to disconnect sockets.

In order to avoid EBU failure because of an electrostatic discharge it is forbidden to touch probes of sockets or the soldered elements.

To establish or attach

1. To insert EBU into a nest, having attached sockets.
2. To establish into place the panel.
3. Negative wire of the battery.

Functioning check

1. To include ignition.
2. To pass to diagnostics mode.
2а. To give out a code 12 four times in a row, to be convinced of absence in memory of EBU of other codes of malfunctions. The code 12 confirms normal functioning of EBU.
2б. If the code of malfunction 51 stands out or the signaling device of TTD burns constantly in the absence of codes, EBU is faulty.

At replacement of EBU to perform all dismantling and assembly operations according to the instructions provided above.