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Title: Me 7.5 1.8T, "mad signal to low" DTC, but it doesen't go in safe mode Post by: BlackT on December 18, 2019, 02:52:02 PM After the prj said in one tread about MAF on ME7, i start too look difrerent and noticed some things.
First ME7 512 kb ECUS that doesen't have ECM relay (like 4B0 906 018, 8N0906018AB...), they don't use MAF at all( I am not 100% clear about this) it calculates g/s acording to actual boost, and not real MAF reading It was strange to me that TT have 130 g/s with k03s, same with my friends A4 And now similar thing on 1kb ECU This night MAF on friend of mine car has failed... I disconnected it, and there is a "MAF to low" DTC, but it doesen't go in limp mode. It boost and runs really fine I don't have eather any O2/WBO2 connected to ECU( I use external to monitor AFR) Code: Edit Log for 4B0906018DC_Tuned_v1.bin created by TunerPro. In attachment is original,and modified file. I am wondering how is that possible? Why ECU doesen't reduce load, go in limp mode or something? Title: Re: Me 7.5 1.8T Mafless Post by: RBPE on December 18, 2019, 03:58:43 PM GGHFM/GGDSAS/SY_EGFE bit sets etc, look into those and follow what they go into detail on
Title: Re: Me 7.5 1.8T, "mad signal to low" DTC, but it doesen't go in safe mode Post by: prj on December 19, 2019, 02:26:24 AM After the prj said in one tread about MAF on ME7, i start too look difrerent and noticed some things. First ME7 512 kb ECUS that doesen't have ECM relay (like 4B0 906 018, 8N0906018AB...), they don't use MAF at all( I am not 100% clear about this) it calculates g/s acording to actual boost, and not real MAF reading It was strange to me that TT have 130 g/s with k03s, same with my friends A4 And now similar thing on 1kb ECU This night MAF on friend of mine car has failed... I disconnected it, and there is a "MAF to low" DTC, but it doesen't go in limp mode. It boost and runs really fine I don't have eather any O2/WBO2 connected to ECU( I use external to monitor AFR) All VAG ME7 1.8T use MAF. None of them go into limp mode when you disconnect it, it goes onto secondary load, which is alpha/n + pressure correction. Title: Re: Me 7.5 1.8T, "mad signal to low" DTC, but it doesen't go in safe mode Post by: BlackT on December 19, 2019, 03:31:32 AM But take a look at this log, when boost goes up MAF reading stay the same. And ps_w ideal follow actual pressure, what is really strange for 20 year old car(parts on car)
And MLHFM conversion doesen't have sense. At 4 V MAF reading schloud be around 130-140 gs, and this ECU measure below 100 gs Title: Re: Me 7.5 1.8T, "mad signal to low" DTC, but it doesen't go in safe mode Post by: prj on December 19, 2019, 03:34:38 AM I am not going to look at anything, I told you how it works, there is nothing to discuss here.
Read the FR and understand what is primary load and what is secondary load. Title: Re: Me 7.5 1.8T, "mad signal to low" DTC, but it doesen't go in safe mode Post by: fknbrkn on December 19, 2019, 07:52:09 AM Actually ecu goes limp
Tslrdyn sets to max, esp not work, tev irc too Running it mafless wo wbo2 not good idea at all What's the question? Title: Re: Me 7.5 1.8T, "mad signal to low" DTC, but it doesen't go in safe mode Post by: RBPE on December 19, 2019, 08:15:15 AM You're asking us to summarise a large part of the FS/FR in a few sentences on what is going on, FB's just given you a breakdown and the proper way is to start looking into it as stated - quick couple of screenshots to get you going;
Title: Re: Me 7.5 1.8T, "mad signal to low" DTC, but it doesen't go in safe mode Post by: RBPE on December 19, 2019, 08:20:32 AM Oops, put the NA one up by mistake!
Also, to technically answer your Q - the ecu has a number of sensors and states to fall back on if one plays up, it'll use various other functional aspects, limits and linearisations etc, to produce it's best modelled output based on it's now limited inputs. PRJ has been talking about it in terms of NA to FI for the R32T lot, SY_DSS/TURBOwhich is kinda the opposite in some respects, a lack of sensors and you can either model it to cater or add sensors - here you're looking at what's left without hfm input and a quick look at other relations like Relative Charge that they relate to. Broken's then summarised why although it may feel right, logging, knowing the system and the fact it's a nifty bit 'o' kit, is why it feels like it's working! Title: Re: Me 7.5 1.8T, "mad signal to low" DTC, but it doesen't go in safe mode Post by: BlackT on December 19, 2019, 09:01:36 AM Actually ecu goes limp Everthing clear now, I only want to know what is happening with ECUTslrdyn sets to max, esp not work, tev irc too Running it mafless wo wbo2 not good idea at all What's the question? Thank you, Thank you RBPE too Title: Re: Me 7.5 1.8T, "mad signal to low" DTC, but it doesen't go in safe mode Post by: RBPE on December 19, 2019, 09:21:17 AM Everthing clear now, I only want to know what is happening with ECU Thank you, Thank you RBPE too Lol, just summarised 4 u as u wrote that! Title: Re: Me 7.5 1.8T, "mad signal to low" DTC, but it doesen't go in safe mode Post by: BlackT on December 19, 2019, 09:29:10 AM Lol, just summarised 4 u as u wrote that! Sorry didn't understand you?Title: Re: Me 7.5 1.8T, "mad signal to low" DTC, but it doesen't go in safe mode Post by: RBPE on December 19, 2019, 09:34:30 AM Sorry didn't understand you? Just saying as you replied I was editing that's all; Title: Re: Me 7.5 1.8T, "mad signal to low" DTC, but it doesen't go in safe mode Post by: prj on December 19, 2019, 02:58:09 PM Actually ecu goes limp Tslrdyn sets to max, esp not work, tev irc too Running it mafless wo wbo2 not good idea at all What's the question? The power is the same as with the MAF. So it is not a classical limp mode. Yes some things do not work quite right, but it never cuts power. Limp mode refers usually to LDORXN... |