Motronic DMEM 1.1-1.3 System Schematic
1 - fuel tank;
2 - fuel pump;
3 - fuel filter;
4 — fuel pressure regulator;
5 - ignition coil;
6 - air flow meter;
7 — nozzle;
8 — ignition distributor;
9 — throttle potentiometer;
10 — electronic control unit (ECU);
11 — idle speed control;
12 - coolant temperature sensor;
13 — engine speed sensor;
14 - fuel storage tank with activated carbon;
15 — ventilation valve;
16 — fuel pump activation relay.
Motronic DMEM 3.1 System Schematic (4-valve engines)
1 - fuel tank;
2 - fuel pump;
3 - fuel filter;
4 — fuel pressure regulator;
5 - ignition coil;
6 - air mass meter with heated conductor;
7 — nozzle;
8 - spark plugs;
9 — throttle potentiometer;
10 — ECU;
11 - idle speed control knob;
12 - coolant temperature sensor;
13 - knock sensor;
14 — engine speed sensor;
15 — fuel tank ventilation valve.
Motronic DME injection system diagram (modern car models)
1 - container with activated carbon;
2 - locking valve;
3 — fuel tank ventilation valve;
4 — fuel pressure regulator;
5 — nozzle;
6 — heating regulator;
7 — ignition coil;
8 — position sensor;
9, 10 - not used;
11 — air flow meter;
12 — control unit;
13 - throttle position sensor;
14 — idle speed controller;
15 - air temperature sensor;
16 — exhaust gas recirculation valve;
17 - fuel;
18 - knock sensor;
19 — speed sensor;
20 — engine temperature sensor (coolant);
21 — lambda probe;
22 — diagnostic plug;
23 - diagnostic lamp;
24 - differential pressure sensor;
25 — fuel pump.
BMW petrol engines are equipped with the Motronic injection system from Bosch. This is a combined ignition and injection system, also referred to as DME (digital engine electronics). The ignition and injection systems are controlled by a single control unit. This chapter mainly discusses the part of the system that is responsible for fuel injection.
DME is a stable system and does not require maintenance. Repairs are also very rare.
[The original article is located on: «BMWman.ru»]