View The Full Version : info alfa 147 2.0 ts bosch me 7.3.1
Hi all , some month ago I deleted kat, and did disable the second lambda from the ecu. Everything is ok, but making a diagnosis with multieciscan I saw that the system only goes into open loop and the voltage of the lambda is up to 800 mv is at idle, and at speed costsnte. My fear is that the ecu is getting fat because he feels the second probe and goes into protection.... if anyone can help me I thank
according to me you should post at least the file to see what has been done in the ecu....
from what you say, it seems that it was fixed the ecu to a fuel mixture of fixed...
you even mapped?
If I can I will post the file. I have not read it yet. No I have not touched the parameters of the series. I only asked to disable the lambda dopobil kat. I make a diagnosis and known that the ecu stays in open loop, and the lambda value is almost fixed to 800 millivolts is at idle, at speed constant. Seems to fat and not to be in cloosed loop at constant speed. I don't know if it is normal...
I'm sorry, but what you probe, go to the monitor?not the second one downstream of kat saw that you excluded...right?
Let's talk about the probe before kat from 800 mv which become 840 at full load. That after the kat value of 450 /455
then it remains always in open loop and at that point the fuel mixture at constant speed?
strange that you can see the reading of the second probe if, however, you did delete...
I repeat, we would have to check on the file and what was done...
however, if you are fat you know better than me ch damage will not do ... to the maximum consumption of more gasoline..
The one who has done the work he claims to have locked out the second lambda to a fixed point and, in fact, I see it set to 450 millivolts... fat does not do harm but consumption very.... then I do not understand why no longer go to the cloosed loop
it can also exist the possibility that the probe upstream of the kat is the game and not work.
But you know if normally when you disable the second lambda is the closed loop continues to function?
But you know if normally when you disable the second lambda is the closed loop continues to function?
according to me...especially speed and constant rpm the ecu should not always be in mode open loop...
but it should follow a map that is called "lambda component protection" closed loop then..
the first lambda that upstream needs to continue to work.
hello etneo, if nn erro at a minimum you should have the open loop, while in the lunge dovreti have closed the loop, test to make a finding on the diagnosis, do the test with the machine stopped
you must continue to work with the probe turned off
you're right, the minimum closed loop thrust open loop, however, the diagnosis must view open and closed loop.
In normal operation, the I know. Apen loop to a minimum and the engine is cold. With A warm engine, cloosed loop speed constant and transient modetartissimi the open loop at the bottom.my ecu is in open loop. My mapper says that having turned off the second lambda is normal that it will not go more in cloosed loop. It seems strange to me. Antonios25 you say that must funzonare the cloosed loop? It may be that I have the probes prekat go or lavoronon was done well?
Sorry ve only in open loop
etna, I excluded the second lambda to be by abarth, lancer ect as they are made direct discharges and in diagnosis I see the open and the closed.
If you have staccatto the second lambda in the ecu, your mapper must see, always open-and closed,
then I repeat the me7 have all in a lot of maps related to the relationship stechio including some very important calls "the Lamda request Driver" "lambda-partial load" and the lambda component protection...shell at all all map working in feedback with the oxygen sensor on the exhaust...so the first map mentioned goes in the feedback openloop the other two in cloosed..
as we have said in many here, your car should still do both cilci work in the ecu even if you have excluded the seoncda probe...if it is not so is because maybe there is an error or who did the work decided to make you walk with the car to carburation fixed seen on these ecu's you can do...
Ok now I begin a little to understand. Then the feedback is also active in openloop? I thought that in these cases the probe was completamemte ignored. But, what would be the advantage to do work for the light csrburazione fixed. Why not let finzionare all with the two complete cycles?
for what I know carburation is fixed it can be used on naturally aspirated engine when these mountains of cams particularly pressures that make it difficult to follow the maps the lambda in the ecu for a variety of reasons...on your engine honestly without seeing the file and let us help you by some guru of the ecu petrol I could not tell you for what reason it was done always did..then the probe is in openloop is not ingnorata but the ecu does not rely on the info that transmits to the ecu-for example during an acceleration, but it relies on an internal map, the fact remains, however, that it is still monitored(the probe and the ratio lambda) in the maps of limitation of lambda is that if, for any reason, are exceeded, the ecu activates different strategies and security...
My engine is perfectly original except for the kat that there are, and the terminal sports. I is a doubt. I the second I disconnected it from the ecu. Could this be the problem. That is, even if you disable to be kept connected?
try to connect it I don't think that anything happen...
I don't understand if the probe is in the open is considered or not. If the carburetion is done by the map, point by point, why the probe should intervene?
the probe does not intervene...the probe and only a sensor that reads the carburzione...su what should be I'm sorry?
I'm sorry I expressed myself badly. Is considered to make the fuel mixture at full load in open loop? From the map you set the lambda target, and by means of the probe is maintained?
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