Diagnostics of malfunctions of injection systems of gasoline engines (VW Polo 4)

Malfunctions in the electronics of the control system can be detected almost exclusively with the help of special measuring devices. Before detecting, based on diagnostics, malfunctions, it is necessary that the following prerequisites are met: the conditions for the occurrence of errors during starting are excluded. Correct engine starting process is set out here.

There should be fuel in the tank, the engine is mechanically sound, the battery is charged, the starter rotates at a sufficient speed, the ignition system is in order, there are no leaks in the fuel system, fuel system contamination is excluded, the engine crankcase ventilation system is in order, electrical connections by ground (engine - gearbox - body) are present. The memory device has been interrogated for fault codes (at the service station).

Caution: Before releasing the fuel lines, it is necessary to relieve the fuel pressure in the system.

(The article is published on this resource: VWmanual.ru)