Faults stored in the memory can only be determined in the workshop, because this requires a special device. In the following description, some verification work will be indicated that can be performed without much difficulty, others require special devices so that you can independently determine some malfunctions and carry out minor repairs. The most common malfunctions should be indicated.
Cold engine won't start or starts very badly
Fuses may blow. Replace them.
The voltage supply relay is out of order. Check it out in the workshop.
The fuel pump is not working or the fuel supply is insufficient. Check pump or replace it (special key required).
Faulty fuel pressure regulator. Measure the fuel pressure in the workshop.
Faulty coolant temperature sensor. The sensor can be checked by yourself (using an ohmmeter).
The throttle control unit has a malfunction. The block needs to be checked in the workshop.
The electronic control unit has a malfunction. This block is also tested in the workshop.
Damaged wiring harness between Hall sensor and control unit. Check him.
The engine sucks in excess air. Check all hose connections from and to the air filter.
Warm engine does not start or starts very poorly
Loose vacuum line to fuel pressure regulator. Check him. Carry out all the checks described above yourself or in a workshop.
Loose plugs. Check them out.
Engine starts but stalls again
Throttle control unit malfunction. Check it out in the workshop.
Vacuum line to pressure regulator is loose. Check him.
Defective lambda probe. Check it out in the workshop.
Engine vibrates at idle
The malfunction may be in the voltage supply relay or in the coolant temperature sensor, as well as in the throttle control unit itself. Check out these details.
Engine stalls
Air filter clogged. Install a new filter.
Malfunction in the fuel pump (insufficient fuel supply).
Leakage in injectors.
Faulty throttle control unit. Check it out in the workshop.
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