Power supply system for gasoline engines BMW 5 Series E34
Engine power system — general information and device The engine fuel system includes the fuel tank, fuel lines, fuel filter, fuel pump, and carburetor or fuel injection device with an air filter. The fuel tank is...
Checking the fuel pump relay The fuel pump relay is located in the relay box at the right rear of the engine compartment. It supplies power to the fuel pump. When you stop receiving pulses...
Checking Fuel Pump Performance — Gasoline Engines Note: On diesel engines, the fuel pressure is measured in the fuel line between the filter and the high pressure fuel pump, which can only be carried out at a...
Removal and installation of the fuel pump The fuel pump is located in the fuel tank next to the fuel gauge. References in the text are to Figure W-2036. Withdrawal Attention: Do not make open fire!...
Fuel injection device for gasoline engines Figure Y—2203 Motronic System 1 fuel tank 2 Fuel pump 3 Fuel filter 4 Fuel pressure regulator 5 Electronic control unit 6 Ignition coil 7 High voltage ignition...
Motronic DME M3.1 system on 4-valve engines The DME M3.1 system on models 520i, 525i from May 1990 is a development of the Motronic M1.1 system. Instead of an air volume flow meter, an air mass flow...
Self-diagnosis system and fault codes If a malfunction occurs in the ignition and fuel injection system while driving, the defect is stored in the control unit in the form of a code. At the same...
Checking the idle speed and CO content Attention: When the Motronic system is operating, the idle speed is controlled by the electronically controlled idle speed controller. Turn off all electrical...
Checking the functioning of the lambda probe Plug the vacuum hose from the fuel pressure regulator. Caution: Switch off the engine first. Start the engine, the CO content increases. Connect the lambda...
Throttle cable adjustment Attention: The throttle cable is sensitive to bending and therefore requires special care during installation. A single slight bend in the cable can cause the...
Resistance test Connect an ohmmeter to the valve contacts and measure the resistance: terminals 1 and 2 about 40 ohms. terminals 2 and 1, or 2 and 3: approx. 20 ohms. Dynamic...
Diagnosis of malfunctions of the injection system Before starting troubleshooting on the following diagnostic table, the following test conditions must be met: driver errors when starting the engine are...