Mercedes S-class W202

1993-2000 of release

Repair and car operation

8.2.10. Diagnostics of malfunctions of system of injection of gasoline

THE GENERAL DATA

Before on the basis of diagnostics of malfunctions the malfunction is found, following control preconditions should be executed: correctly start the engine. Both for cold, and for the heated-up engine fairly following: do not press a pedal of an accelerator during start, squeeze out a coupling pedal. In a tank there should be a fuel, in the mechanical relation the engine also should be as it should be, the storage battery is charged, the starter rotates with sufficient frequency, the ignition system is perfectly in order, the power supply system is tight and is not polluted, ventilation картера is perfectly in order, reliable electric connection with the car case (the engine – a transmission – a body) is provided. In a repair truck charge to interrogate memory of malfunctions.

---

The prevention

If топливопроводы unscrew, they are necessary for washing out in advance with use of means for cold clearing (детергентов) or gasoline.

---

THE REASON	WAY OF ELIMINATION
The engine is not started
At starter inclusion the fuel pump with the electric drive (it is not audible noise at work) is not started	Slightly knock on the pump case that could separate probably зависший the pump. Check up, whether pressure on the pump moves. Check up electric contacts on good conductivity.
The safety lock is faulty	Check up a safety lock of the fuel pump.
The relay of the fuel pump is faulty	Check up the relay.
To клапанным to atomizers pressure does not move	Снимимте штеккерные sockets from atomizers, connect a control bulb and press a starter. The control bulb should blink poorly. If the bulb gleams: replace the actuation device. If the control bulb is not shone: check up the relay of the fuel pump.
The cold engine is badly started, works spasmodically
The temperature-sensitive element is faulty	Check up a temperature-sensitive element.
The oxygen gauge is faulty	Charge to check up the oxygen gauge, if necessary replace.
The engine stops (works with faults)
The electric connections concerning the fuel pump are periodically disconnected	Check up on strong and faultless connection штеккерные connections and connections of electric wires on the fuel pump and its relay. Check up a safety lock and places контактирования on the relay of the fuel pump. Clean contacts.
Too low volume giving of fuel by the pump	Charge to a repair truck to check up volume giving of fuel.
The fuel filter is littered	Replace the fuel filter.
The fuel pump is faulty	Check up the fuel pump.
Негерметична клапанная an atomizer	Check up клапанную an atomizer.
The engine has defects at work on transitive modes
Негерметична system of an admission of air	Check up system of an admission of the engine. For this purpose leave to work the engine in a mode of idling and miss the mark with place gasoline уплртнения, and also connections in a soaking up path. If frequency of rotation quickly increases, it is necessary to eliminate available негерметичность. Attention: gasoline steams are poisonous, do not inhale them!
The temperature-sensitive element of a cooling liquid is faulty	Check up a temperature-sensitive element.
Негерметична the power supply system	Examine all junctions in a zone of the engine and the electric fuel pump.
The hot engine is not started
Too a high pressure in the power supply system	Charge to check up pressure in the power supply system, if necessary replace a pressure regulator.
The drain line between a regulator of pressure and the fuel pump is littered or bent	Clean or replace a line (pipeline).