Description of the L-Jetronic fuel injection system (Mercedes-Benz E-Class W123)

1 - fuel tank; 2 - fuel pump; 3 - fuel filter; 4 - distribution main; 5 - pressure regulator; 6 - electronic control unit (microcomputer); 7 - injection nozzle; 8 - starting nozzle; 9 - idle speed adjusting screw (engine M102.920); 10 - throttle potentiometer; 11 - throttle valve; 12 - air flow meter; 13 - power-on relay block; 14 - oxygen concentration sensor; 15,16 - temperature sensor; 17 - ignition distributor sensor; 18 - additional air supply valve; 19 - adjusting screw for idle mixture quality (composition); 20 - battery; 21 - ignition switch; 22 - air temperature sensor

19 - fuse; 20 - ignition coil; 24 - starter; 30 - starter relay; 71 - fuel pump; 90 - relay block; 91 - additional resistors; 97 - injectors; 98 - temperature sensor; 99 - main connection point with the "mass"; 100 - Electronic control unit connector; 101 - Cold engine start relay; 102 - Throttle switch; 103 - Thermal time relay; 104 - Air flow meter; 105 - starting nozzle

A - 1st option; B - 2nd option; 1 - throttle actuator rod; 2 - throttle body; 3 - fuel tank; 4 - fuel electric pump; 5 - fuel filter; 6 - fuel storage tank; 7 - fuel dispenser; 8 - fuel pressure regulator in the system; 9 - fuel supply pipeline to the injector; 10 - nozzle; 11 - starting nozzle; 12 - additional air supply valve (LE injection system); 13 - additional air supply valve (LE injection system); 14 - inlet manifold; 15 - Air filter housing; 16 - filter element; 17 - air duct; 18 - gasket

1 - fuel dispenser; 2 - air flow meter; 3 - control pressure regulator; 4 - fuel pressure regulator in the system; 5 - starting nozzle; 6 - idle speed adjustment conical screw; 7 - air flow meter pressure disk position sensor; 8 - throttle switch; 9 - additional fuel supply valve; 10 - coolant temperature sensor; 11 - electronic control unit