Ethanol percentage flex fuel

[George B]

Thanks to @wsteele I checked for a calibration available for my FPCM in my 2013. I have one available but cannot see the FPCM with my Tech2 however I didn't look in module setup in the control section.

 

[wsteele]

Thanks to @wsteele I checked for a calibration available for my FPCM in my 2013. I have one available but cannot see the FPCM with my Tech2 however I didn't look in module setup in the control section.

I didn't realize you had a 2013 (just forgot to look at your sig). You should be able to see the FPCM in the diagnostics section with the Tech 2, see all the stuff Ken and James have been talking about FP, Trim, etc., realtime. The navigation to get to those pages are contained in the post above by Tom @gooffeyguy. If you page through just as he shows, you should be able to see the FPCM section.

 

[George B]

I didn't realize you had a 2013 (just forgot to look at your sig). You should be able to see the FPCM in the diagnostics section with the Tech 2, see all the stuff Ken and James have been talking about FP, Trim, etc., realtime. The navigation to get to those pages are contained in the post above by Tom @gooffeyguy. If you page through just as he shows, you should be able to see the FPCM section.

That's the thing... I saw that post and went looking. No Love! Not there!
I will check again tonight...

 

[wsteele]

That's the thing... I saw that post and went looking. No Love! Not there!
I will check again tonight...

That is very strange indeed. You definitely have a Fuel Pump Control Module or you wouldn't have a listing in the controllers window on the TIS2web search results page for your VIN and no calibrations listed for it.

 

[George B]

Found it! They say “with trailer brake control” so I never selected it.
Here is my pressure at idle.

 

[kbuskill]

Found it! They say “with trailer brake control” so I never selected it.
Here is my pressure at idle.

View attachment 280463 View attachment 280464

Out of curiosity, how many miles on your rig?

 

[wsteele]

Found it! They say “with trailer brake control” so I never selected it.
Here is my pressure at idle.

View attachment 280463 View attachment 280464

When I was looking at part numbers there are FPCM’s that are no trailer brake control and others with TBC. I suspect they had some pins available and some spare processor cycles, so put that option in that location.

Does your truck have TBC?

 

[George B]

When I was looking at part numbers there are FPCM’s that are no trailer brake control and others with TBC. I suspect they had some pins available and some spare processor cycles, so put that option in that location.

Does your truck have TBC?

Yes

 

[George B]

Out of curiosity, how many miles on your rig?

79900

 

[wsteele]

Definitely not trying to hijack my own thread, but given that the system doesn't even see the FPCM in 2007, I wonder if an Integrated Trailer Brake Controller option was even offered in the 2007's?

 

[George B]

Found it! They say “with trailer brake control” so I never selected it.
Here is my pressure at idle.

View attachment 280463 View attachment 280464

To clarify, my rig calculates the alcohol percentage correctly. I am just posting information in an effort to add data point. Let me know if it’s not helpful.

 

[wsteele]

To clarify, my rig calculates the alcohol percentage correctly. I am just posting information in an effort to add data point. Let me know if it’s not helpful.

I remembered yours was pretty spot on. It is very helpful for me. Thank you for posting.

 

[wsteele]

Definitely not trying to hijack my own thread, but given that the system doesn't even see the FPCM in 2007, I wonder if an Integrated Trailer Brake Controller option was even offered in the 2007's?

Never mind, I found it. The ITBC option was offered starting in 2009 in the 1/2 ton models.

Now I wonder if the 2008's are setup like mine (with no FPCM visible) or like the 2009 and onward, with FPCM there and controlling things.

 

[kbuskill]

Never mind, I found it. The ITBC option was offered starting in 2009 in the 1/2 ton models.

Now I wonder if the 2008's are setup like mine (with no FPCM visible) or like the 2009 and onward, with FPCM there and controlling things.

My 2008 has the FPCM and no ITBC... Just FYI.

 

[wsteele]

My 2008 has the FPCM and no ITBC... Just FYI.

Oh I forgot yours was a 2008, probably should reflect a little before posting questions. I need a matrix to keep track of all the data points.

So only the 2007’s have the dumb FPCM. One more reason to not buy the first editions...

 

[swathdiver]

So only the 2007’s have the dumb FPCM.

That's correct, all the others have it though the menus can be different year to year. When using the Tech-2 on my 2009, it never remembers what motor or trans or gvwr, etc. But it does remember all or some of that on the 2012 Sierra.

 

[gooffeyguy]

That's correct, all the others have it though the menus can be different year to year. When using the Tech-2 on my 2009, it never remembers what motor or trans or gvwr, etc. But it does remember all or some of that on the 2012 Sierra.

My Tech2 doesn't remember anything from my 2012, I gotta select/re-select everything when going through the menus

Sent from my SM-G930V using Tapatalk

 

[George B]

My Tech2 doesn't remember anything from my 2012, I gotta select/re-select everything when going through the menus

Sent from my SM-G930V using Tapatalk

Mine doesn’t either

 

[wsteele]

Mine remembers the VIN and calibrations. I got those after going into SPS and doing the request information function.

 

[wsteele]

OK, here is another twist. I decided there was enough confusion when looking up part numbers for my FPCM, that I decided to drop my spare and get exact part number on my FPCM. Guess what, no FPCM on my truck that I can find. Whatever my truck is doing to manage fuel pressure, it seems very different than previous and later model years. I went and looked to see if maybe they carried the pressure regulator over from earlier model year, didn't see anything. Frankly, it is starting to piss me off.