Makes me wonder if your fuel pump controller is dodgy, or not playing nicely with your colourful fuel pumps.Title: Re: P1065 DTC - how does ECU know? (Fuel Pressure Regulation:Regulation Discrepancy)
Post by: MoparFreak69 on November 04, 2015, 08:32:05 PM
The ECU calculates fuel pressure based on actual injector on time vs what it should be based on injector offset voltages. It can tell fuel pressure is low if it has to fire the injectors longer than calculated to maintain afrs.
Title: Re: P1065 DTC - how does ECU know? (Fuel Pressure Regulation:Regulation Discrepancy)
Post by: ddillenger on November 04, 2015, 11:40:06 PM
Quote from: MoparFreak69 on November 04, 2015, 08:32:05 PM
The ECU calculates fuel pressure based on actual injector on time vs what it should be based on injector offset voltages. It can tell fuel pressure is low if it has to fire the injectors longer than calculated to maintain afrs.
Helluva trick on a narrowband car.
Title: Re: P1065 DTC - how does ECU know? (Fuel Pressure Regulation:Regulation Discrepancy)
Post by: nubcake on April 06, 2016, 09:26:36 AM
I guess, I'll give an update to this.
Thanks to the thread on DTC logic (http://nefariousmotorsports.com/forum/i ... ic=10018.0) and error classes (http://nefariousmotorsports.com/forum/i ... opic=567.0).
I did some digging through code to find where and how this DTC is set. Found some function that is unique to RS6, so I can't really cross-reference it with other "defined" software and name vars/consts properly, but apparently it is responsible for controlling the fuel flow. It also can set P1063 and P1020 DTCs. It interfaces with other functions via few RAM vars, and those are mostly used by EKP ("elektrische Kraftstoffpumpe") routines. I did not invest enough time into figuring out the complete logic of this process, but apparently ECU checks back on fuel pump status reported by the fuel controller and limits the load via LDRLMX (http://nefariousmotorsports.com/forum/i ... 2.msg77002) if something's wrong. It also sets P1065 if the signal is missing completely.
Also, for shits and giggles, I reverted to the 4 bar FPR - and surely enough, the DTC is still there. It also reappears almost instantly on idle after clearing it.
So, after all, dd was right - it seems that it's the "missing fuel controller" that produces this DTC.
EGT sensors.
Re: EGT sensors.
I just had a search for some info and came across this very interesting info on nefmoto:
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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steve2003rs6
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Re: EGT sensors.
Hi Ben. Yes mate as you know I am replacing both fuel pumps. Still waiting tor the internal pump from AT.
As soon as it arrives, I will get both pumps and the fuel regulator replaced.
Hopefully at the same time investigate the potential exhaust gas leak.
Then take it from there.
For certain I had fuel pump problem. From when I had to call the AA out.
For certain I have exhaust gasses coming into the cabin. Noticeable in stationary traffic.
Get these errors sorted first.
As soon as it arrives, I will get both pumps and the fuel regulator replaced.
Hopefully at the same time investigate the potential exhaust gas leak.
Then take it from there.
For certain I had fuel pump problem. From when I had to call the AA out.
For certain I have exhaust gasses coming into the cabin. Noticeable in stationary traffic.
Get these errors sorted first.
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steve2003rs6
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Re: EGT sensors.
Just performed a re scan.
Weirdly no errors recorded.
Not even won’t safe or de safe errors recorded for the door locks. Now that’s a first on my car.
Weirdly no errors recorded.
Not even won’t safe or de safe errors recorded for the door locks. Now that’s a first on my car.
Re: EGT sensors.
That’s it. The holy grail. Now you must throw your Vagcom away.
Or wait for your wife to hide it again.
Or wait for your wife to hide it again.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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steve2003rs6
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Re: EGT sensors.
Fcuk that Ben. Last time it cost me £500 to get a new unlimited vins replacement.
<beep>. Spring cleaning again soon. Wonder what I WILL MISPLACE this year.
<beep>. Spring cleaning again soon. Wonder what I WILL MISPLACE this year.
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steve2003rs6
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Re: EGT sensors.
I reckon I have a manifold leak.
On top of the exhaust gas smell in stationary traffic. I also get a smell of petrol in the cabin on cold start.
On top of the exhaust gas smell in stationary traffic. I also get a smell of petrol in the cabin on cold start.
Re: EGT sensors.
Classic signs.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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steve2003rs6
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Re: EGT sensors.
Is it an engine out job for manifold gaskets.
How long does it take to remove engine.
Should give me a rough guesstimate of what to budget.
How long does it take to remove engine.
Should give me a rough guesstimate of what to budget.
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111marc111
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Re: EGT sensors.
Absolutely engine out for manifold gaskets.
Id want to be 100% confident on it being a manifold gasket issue before taking the plunge.
The Super Ron rs6 manifolds failed in the same place my manifold failed but seemed to fail in a different way. His was clearly leaking exhaust gas out. You could hear it and see evidence of soot on the video. Mine wasnt leaking out to atmosphere, I couldn't hear it. Couldn't see sign of a leak but failure was essentially the same.
Id want to be 100% confident on it being a manifold gasket issue before taking the plunge.
The Super Ron rs6 manifolds failed in the same place my manifold failed but seemed to fail in a different way. His was clearly leaking exhaust gas out. You could hear it and see evidence of soot on the video. Mine wasnt leaking out to atmosphere, I couldn't hear it. Couldn't see sign of a leak but failure was essentially the same.
Re: EGT sensors.
Budget just won't be the manifold leaks there will be other stuff to do while it's out.... I'd think the turbos would need refurbishment at the same time.There's a few annoying jobs that start 'drop engine' so I'd think those would be sensible to get done while it's out and more bits are accessible.
From what I remember I think it's at least 10 hours to take it out.
From what I remember I think it's at least 10 hours to take it out.
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111marc111
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Re: EGT sensors.
If you dont get plagued with seized and or snapping bolts etc I'd say 10hours is fair. Maybe quicker in a proper Shop on a ramp.
Engine out would really be an absolute last resort for me. And once that decision is made like above has said its an incredible list of other stuff to get done while it's out.
I'm very nearing the end of this pain now. With the very little spare time I get it's been 6months off the road so far!
Engine out would really be an absolute last resort for me. And once that decision is made like above has said its an incredible list of other stuff to get done while it's out.
I'm very nearing the end of this pain now. With the very little spare time I get it's been 6months off the road so far!
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steve2003rs6
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Re: EGT sensors.
Many thanks for all the comments.
Will see what happens when it goes in the garage for fuel pumps and leak diagnostics.
Will see what happens when it goes in the garage for fuel pumps and leak diagnostics.
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steve2003rs6
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Re: EGT sensors.
Update.
Not had the EGT error since.
Fingers crossed it was a blip.
Update 18/05/25
No issues since both fuel pumps and the exhaust sleeves were replaced.
Not had the EGT error since.
Fingers crossed it was a blip.
Update 18/05/25
No issues since both fuel pumps and the exhaust sleeves were replaced.
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