Injection system (gasoline) of the car Mercedes C-Class (W202)

Engine Management Systems PMS and HFM
C-class engines are equipped with an electronic ignition and fuel injection system. The ignition and injection systems are regulated by one common control device. This...

How PMS works
Engines with a capacity of 1.8/2.0 l PMS diagram – fuel injection system (1.8/2.0 l engines) 36. Thermostat (only for type 124); 40. Diaphragm pressure regulator; 41....

How the HFM system works
A significant difference compared to the PMS engine management system is the use of a heated film air flow meter (HFM) instead of an air pressure sensor. The air flow...

Self-diagnosis of the ignition and fuel injection system
With HFM and PMS control systems, it is no longer necessary to regulate the engine idle speed and the carbon monoxide content. The system monitors itself and stores the...

Air flow meter — removal and installation
Removal 1. Remove the plug connector (arrow) from the air flow meter (B2/5), after loosening the union nut on the connector. 2. Loosen the mounting clamp (4/7). 3....

Coolant Temperature Sensor — Removal, Checking and Installation
The temperature sensor measures the coolant temperature and transmits electrical signals to the control unit. The sensor is equipped with an NTC element (NTC – negative...

Intake Air Sensor — Removal, Checking and Installation
The temperature sensor measures the temperature of the intake air. This value, together with the signal from the intake manifold pressure sensor (pMS management system)...

Vacuum piping system
Engines with a capacity of 1.8/2.0 l 30. Diaphragm pressure regulator; 60. Membrane mechanism of the vacuum ignition advance regulator in the modulating pressure system...

Fuel distributor with valve injectors
Removal Warning! Ensure good ventilation of the workplace! Fuel vapors are toxic, avoid using open flames due to the risk of fire! 1. Disconnect the ground (–) cable...

Valve injectors — removal and installation
Removal 1. Remove the fuel distributor together with the injector valves. 2. Remove the rotation stops (16/7) on the valve injectors. 3. Pull the injector valves out of...

Oxygen sensor (lambda probe) — removal and installation
Removal 1. Remove the right protective cover behind the front wall of the cab. 2. Remove the magazine with wires from the front wall of the cabin. To do this, pull out...

Diagnostics of faults of the petrol injection system
Before a fault is found based on fault diagnosis, the following check prerequisites must be met: Start the engine correctly. The following applies to both cold and warm...

What should an owner of a car with an injection engine know?
Injector engines are superior to carburetor engines in many respects, for example, their efficiency and trouble-free starting in cold weather. Nevertheless, carburetor...

Turbocharger repair and replacement
Rule N1 : don't even think about repairing a turbocharger at home. Rule N₂ : You can replace a faulty turbocharger with a new one without much difficulty. Not so long...

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More similar sections for repairing other models

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☛ Power unit: Fuel injection system car Mercedes W126 (1979-1991, petrol)

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190 (W201) (1982-1993)