[Hollard]

Originally Posted by L78toLT1

Ok, Hollard. It finally dried out enough for me to get back to logging. I started at 12% alcohol and started working my way up. Everything was looking good, the low side held in the mid '70's, high side around 2800- 2900 to around 6800rpm or 145mph in 4th gear.
When I logged at 42.7% alcohol, I got a VEL with our usual two little friends, P069E and P0231. I'm not sure why I got the CEL, the low side stayed right around 70, highside 28 -2900. At 137mph/6378rpm in 4th the lopsided dropped briefly to 59, highside was 2,886. The low side quickly rebounded and I finished the run at 146/6,824, 67/2890. I don't feel the CEL's were justified at these numbers! I should also mention that the injector pulse width is good, max value just a hare over 5ms.
I'm going to send the log to Ted, and also do another pull around 60%e. Stay tuned for the results.

I'm surprised the codes came up again while you were at 42.7% of ethanol. I would say once Ted takes a look at your log, he may revise your tune and that should do the trick.

The 1st time I was getting those codes, Ted took a look at my log, did a revised tune for me and told me to try and that I might have to reduce down to e45. I had uploaded the tune, drove off to mix the current blend in my tank down, but while drive I was like, "Heck, let me see what it does with the current blend at 54. I did long pulls twice and had no issues. From there, I assumed I was good for continuing with using up to e60. But my stubbornness had me wrong.

As of now, I've still had no issues while at e45. I'm almost down to 3 gal. left in the tank; I may try to see if I can go up to e50 though.

[Joshinator99]

Did you guys make any headway solving this P0231 issue? I just added the JMS, set for 17.47V at 70+% throttle, and had this code pop up under a WOT run. I’m not running any E, just the little bit in regular 93 octane here in MA (E08 according to my datalog).

[L78toLT1]

I don't know what the hell is up with those codes. I did a couple of pulls on e60, got the codes of course, but the low side stayed between 65 & 75 psi all the way to 156mph in 5th gear. When I tabbed thru the log, I did see the low side drop into the high 50's for a split second before bouncing back.
Ted thinks I may have a bad connection at the pump, form or JMS. He said not to worry about it as long as the pressures are good. I'm not usually one to disagree with Ted, but there are too many of us with the same issue and it seems unlikely to me that we all have wiring problems.

[Joshinator99]

Originally Posted by L78toLT1

I don't know what the hell is up with those codes. I did a couple of pulls on e60, got the codes of course, but the low side stayed between 65 & 75 psi all the way to 156mph in 5th gear. When I tabbed thru the log, I did see the low side drop into the high 50's for a split second before bouncing back.
Ted thinks I may have a bad connection at the pump, form or JMS. He said not to worry about it as long as the pressures are good. I'm not usually one to disagree with Ted, but there are too many of us with the same issue and it seems unlikely to me that we all have wiring problems.

Agreed. The shop I use makes OEM level harnesses all the time (they did comedian Kevin Hart’s Corvette) and the wiring he did on my JMS was very nicely done. All weathertite packard connectors, so that coupled with your comment about how many people this is happening to, makes me agree that it’s not likely a wiring problem.

I notice in the FSCM tune that the DTC P0231 code is activated after the “first error”, where most of the other fuel system voltage codes are either after the “second error” or “no error reported” at all. I’m thinking about trying to set it for after the “second error” and see if that helps. If Ted is correct about really just watching the fuel pressure, then I may just put it to “no error reported” and be done with it... It’s kind of unnerving when you’re on a run with nearly 800 WHP and a CEL comes on in the middle of the run...

[JANNETTYRACING]

Originally Posted by L78toLT1

I don't know what the hell is up with those codes. I did a couple of pulls on e60, got the codes of course, but the low side stayed between 65 & 75 psi all the way to 156mph in 5th gear. When I tabbed thru the log, I did see the low side drop into the high 50's for a split second before bouncing back.
Ted thinks I may have a bad connection at the pump, form or JMS. He said not to worry about it as long as the pressures are good. I'm not usually one to disagree with Ted, but there are too many of us with the same issue and it seems unlikely to me that we all have wiring problems.

I did not say it was a wiring issue, I alluded to a few possibilities including, wiring, a weak pump, and uncovering the pick up.

As the E content goes up the issue is more prevalent, which lends to all of the above.

Originally Posted by Joshinator99

Agreed. The shop I use makes OEM level harnesses all the time (they did comedian Kevin Hart’s Corvette) and the wiring he did on my JMS was very nicely done. All weathertite packard connectors, so that coupled with your comment about how many people this is happening to, makes me agree that it’s not likely a wiring problem.

I notice in the FSCM tune that the DTC P0231 code is activated after the “first error”, where most of the other fuel system voltage codes are either after the “second error” or “no error reported” at all. I’m thinking about trying to set it for after the “second error” and see if that helps. If Ted is correct about really just watching the fuel pressure, then I may just put it to “no error reported” and be done with it... It’s kind of unnerving when you’re on a run with nearly 800 WHP and a CEL comes on in the middle of the run...

His code is set to not reported but still reports not sure why.

Ted.

[L78toLT1]

Thanks for chiming in, Ted and sorry for misrepresenting your comments. I understand that the issue is more prevalent at higher e content but don't understand why we're all getting the low secondary fuel system voltage CEL. Shouldn't all of us be getting 17.5v at the pump at WOT, regardless of the e content and output pressure? I get that the low side pressure will start to drop off at higher e content, but even with a decrease in pressure, shouldn't the voltage remain constant?
It almost seems as if in my case, there's just a ghost in the machine so to speak since mine is set not to report

[KingLT1]

Not sure if this helps or not but I have never got those codes and I have ran as high as E78. The only difference is my JMS is hobbs switch activated.

[Joshinator99]

Originally Posted by JANNETTYRACING

I did not say it was a wiring issue, I alluded to a few possibilities including, wiring, a weak pump, and uncovering the pick up.

As the E content goes up the issue is more prevalent, which lends to all of the above.



His code is set to not reported but still reports not sure why.

Ted.

Thanks for chiming in Ted, appreciate your insight.

I’m getting this code with no E (or as little comes in 93 octane, my scanner reds 8% E).

If the code was still pending when you turned it to “No Error Reported”, that might be why...? I don’t know that, just spitballing at this point.

[Joshinator99]

Originally Posted by KingLT1

Not sure if this helps or not but I have never got those codes and I have ran as high as E78. The only difference is my JMS is hobbs switch activated.

Hmmm...very interesting...! It’s happening at WOT, so the JMS is shooting 17.47V, same as when you use the Hobbs switch method, so that *shouldn’t* matter, but who knows.

[KingLT1]

I will have to double check but I don't think I have my JMS sending that much voltage. Have you guys tried dialing back the voltage some? I would try something like 15.2 volts and see if it goes away. I wonder if the extra voltage is freaking out the FSCM? I know LPE does not like to run the JMS or KB boost-a-pumps higher then 15.2 volts.

[JANNETTYRACING]

Originally Posted by L78toLT1

Thanks for chiming in, Ted and sorry for misrepresenting your comments. I understand that the issue is more prevalent at higher e content but don't understand why we're all getting the low secondary fuel system voltage CEL. Shouldn't all of us be getting 17.5v at the pump at WOT, regardless of the e content and output pressure? I get that the low side pressure will start to drop off at higher e content, but even with a decrease in pressure, shouldn't the voltage remain constant?
It almost seems as if in my case, there's just a ghost in the machine so to speak since mine is set not to report

The 17.5 volts enters the FPCM then the FPCM controls the pump via Pulse width modulation.

With higher E- content the volume of fuel must go up.

As long as we disprove the above suggestions then we can work on PWM settings and possibly solve the issue.

I never give up.

Ted.

[JANNETTYRACING]

Originally Posted by KingLT1

I will have to double check but I don't think I have my JMS sending that much voltage. Have you guys tried dialing back the voltage some? I would try something like 15.2 volts and see if it goes away. I wonder if the extra voltage is freaking out the FSCM? I know LPE does not like to run the JMS or KB boost-a-pumps higher then 15.2 volts.

I like this suggestion but would try 17.0 volts first.

We know from experience that above 17.5 freaks out FPCM that is why we go to 17.4

Ted.

[KingLT1]

Originally Posted by JANNETTYRACING

I like this suggestion but would try 17.0 volts first.

We know from experience that above 17.5 freaks out FPCM that is why we go to 17.4

Ted.

Gotcha... Maybe it was 17.2 volts they set them to not 15.2. I know you have these figured out, but yea it sounds like a potential issue of too much voltage being applied.

[L78toLT1]

That sounds like a plan, Ted. If I have time when I get home from work, I'll do a pull at 17v. Btw: in earlier posts, I said I was at 17.5v. I'm actually at 17.4x