2.6.7. Possible malfunctions of the L-Jetronic system, their reason and methods of elimination

Malfunctions 1 — 8

  1. The engine is not started (oil temperature less or is equal to 20 °C).
  2. The engine is not started (oil temperature more or is equal to 60 °C).
  3. The complicated launch of the engine (temperature of oil is less or it is equal to 20 °C).
  4. The complicated start-up (temperature of oil is more or it is equal to 60 °C).
  5. The engine is started and "becomes deaf".
  6. The engine idles unstably at warming up.
  7. Idling of the engine does not correspond to nominal rate.
  8. The engine idles with interruptions.

malfunction No.

To check

1

2
3

4

5
6
7
8

X

X

X

X

     

Fuel pump

X

X

X

X

       

Filter of thin purification of fuel

X

X

X

X

X

X

   

Pressure of injection of nozzles

X

X

X

X

X

X

   

Pressure of forcing of the fuel pump

   

X

X

   

X

Productivity of the fuel pump

   

X

       

X

Quality of fuel

   

X

X

X

X

Valve of additional supply of fuel

X

X

   

X

X

Thermal timer

   

X

X

X

X

Starting nozzle

X

X

X

X

X

X

X

X

Injection nozzles

   

X

X

X

X

X

Sensor of temperature of cooling liquid

           

X

Switch of a butterfly valve

   

X

X

X

X

Case of a butterfly valve

   

X

X

X

X

Pneumatic actuator of a butterfly valve

X

X

X

X

X

X

X

X

Air consumption measuring instrument

X

X

X

X

X

X

X

X

Electronic control unit

X

X

X

X

X

X

X

X

Electrical wires and their connections

X

X

X

X

X

     

Relay of turning on of the fuel pump

   

X

X

X

X

X

Air filter

     

X

   

X

Engine cooling system

           

X

X

Tightness of connections in the inlet highway of the engine

   

X

X

X

X

Lack of foreign intake of air in the engine

X

X

X

X

X

X

X

Inlet path of the engine

               

Lack of gas mixture at partial loading of the engine

Malfunctions 9 — 17

  1. The engine "shakes" at dispersal.
  2. The engine "shakes" at the movement with a constant speed.
  3. The engine "shakes" on compulsory single to the course.
  4. Knock in the engine at increase in frequency of rotation of a bent shaft.
  5. The engine has no sufficient acceleration performance.
  6. The increased fuel consumption.
  7. The increased content of carbon monoxide and hydrocarbons in the fulfilled gases idling.
  8. The lowered content of carbon monoxide and hydrocarbons in the fulfilled gases idling.
  9. The engine does not develop full capacity.
malfunction No.
To check

9

10
11
12
13

14

15
16
17
       

X

     

X

Fuel pump

X

X

   

X

   

X

Filter of thin purification of fuel

X

X

   

X

   

X

X

Pressure of injection of nozzles

X

X

   

X

   

X

Pressure of forcing of the fuel pump

X

X

   

X

       

Productivity of the fuel pump

X

X

X

X

X

   

X

Quality of fuel

         

X

     

Valve of additional supply of fuel

       

X

X

X

   

Thermal timer

X

   

X

X

X

X

Starting nozzle

X

X

X

X

X

X

X

X

Injection nozzles

X

X

X

X

X

X

X

X

Sensor of temperature of cooling liquid

       

X

X

X

X

Switch of a butterfly valve

           

X

X

X

Case of a butterfly valve

           

X

   

Pneumatic actuator of a butterfly valve

X

X

X

X

X

X

X

X

X

Air consumption measuring instrument

X

X

X

X

X

X

X

X

X

Electronic control unit

X

X

X

X

X

X

X

X

X

Electrical wires and their connections

   

X

           

Relay of turning on of the fuel pump

X

X

   

X

X

X

X

X

Air filter

X

X

X

X

X

X

X

Engine cooling system

X

X

   

X

       

Tightness of connections in the inlet highway of the engine

X

   

X

   

X

X

Lack of foreign intake of air in the engine

X

X

   

X

   

X

X

Inlet path of the engine

X

     

X

X

X

X

Lack of gas mixture at partial loading of the engine