Chevrolet Aveo/Kalos Failure 2011

Hi Wal7er, there are basically 2 diagnostic logics used by ECU. The first is the verification of the continuity of its main circuits every time you put plate, and permanently when the engine is being used. For that reason if your disconnects any sensor or actuator the ECU detects open circuits. They are immediate "set" codes.
The second are problems that are generated in "OBD trip" or trip, driving cycles. In the case of P0300 it is a code that needs a lot of information process by the ECU, to be able to determine, for example, in the cylinder there is Misfire or not. For that reason it is not a code that is automatically generated even the first time it occurs. If it weren't, the OBD system would not have tolerance to the failures and we would be full of codes. I don't know if it is understood. You should verify the pond of the encaquetura and the same multiple. The other one that occurs to me that the cylinder goes out due to excess gases of exhaust gases (EGR). I have seen cases due to a sign of systems to make EGR gases recirculate in 1 or 2 cylinders, when the EGR system by operating default makes exhaust gases recirculate indiscriminately, the mixture in those cylinders can be very impoverished in those cylinders being able to Ocacionart Misfire. I do not remember exactly the motor brand and model but once due to a cylinder head, EGR gases passed to the admission duct of the cylinder that failed, of course it is an extreme case. But the EGR duct towards the admission today is integrated into the same cylinder head (internal conditioning). Addressingly to be fixed whether in the multiple of the cylinder that is producing Misfire there is another depression taking or the taking of the EVAP for example, any system that is connected to the multiple especially to the N2. Greetings cordials from Quilpue V Region.

Hi Wal7er, Sefun This:

[EOBD]
Record2 -> Freeze Frame

Fuelsys1 Cl
Fuelsys2 -Load_pct
(%) 4.7
Ect (° C) 58
Shrtft1 (%) 4.7
Shrtft3 (%) -100.0
Longft1 (%) -1.6
LongFT3 (%) -100.0
MAP (KPA) 43
RPM (RPM) 878
vss (km/h) 0

The frozen data box at the time the code setting occurred, as a photo of the main parameters just at the moment that P0300 was displayed by the ECU.

SHRTFT1 ( %) 4.7
This parameter means that the ECU was correcting in real time 4.7 % of the calculated base pulse, if the value is positive it is curling, negative impoverishes. I do not know if you understand me, it is the same to say that the ECU processing the oxygen sensor signal determines that it is leaving 4.7 % poor with respect to the base pulse calculated therefore to achieve stoichiometry in real time corrects 4.7 % towards +.
Therefore, at the time that P0300 appeared, a surprising event occurred that left the ECU almost 5% poor sudden, forcing it to react, for example when a misfire occurs the concentration of oxygen in escape gases before the catalyst rises, because there is no combustion or this is very bad and almost 21% oxygen of the environment is mixed with much poorest gases in oxygen (cylinders that burn well) It produces that the ECU by oxygen excess in exhaust gases detects a condition of sudden probation in the mixture, and quickly corrects, in this case 4.7 % by enrriquizing. PD base pulse calculated basivcically by the ECU: amount of air by entering the engine, revolutions, temperature, and others of lower incidence. Greetings.