JB4tech.com - International Turbo Tuning Discussion
(#1)
Old
DILUSI's Avatar
DILUSI DILUSI is offline
Junior Member
 
Posts: 69
Join Date: Jun 2015
Car: e92 335i N54 2007
Default Flex Fuel reading 4v problem - 01-15-2022, 01:45 PM

Hello to anyone who can assist me with my Flex Fuel issue

I have setup flex fuel using a specific MHD tune from an experienced tuner (JSR) and a fuel-IT ethanol analyzer which can read over bluetooth plus on a 0-5v signal wire

My setup; The ECA analyzer wire plugged into Harness PIN#16 on the black 26 pin sub

Issue I'm having is #pin16 has 4v coming out of it which is normal based on my testing this car and others. However when I plug my ECA signal wire which currently has 0.28v (pump gas) it doesn't change the PIN16 voltage to the ECA reading but rather keeps the 4v resulting in a E reading of E80 on MHD and my JB4

My fuel-IT app shows E4 which is correct based on pump gas and 0.28v which I measured with a multimeter

My tuner has double checked the tune and seeing as I can see E content in both MHD and JB4 it looks right. But because I have a persistent 4v on PIN16 my E content is skewed

Important to note;
I installed a new DME MSD81 which came from a 135 from 2008 from the USA. I have my old mds80 but is now not coded to my CAS

I have a theory which comes from looking at the wiring diagrams attached in the PDF at the end of my thread

In the USA PIN 16 and PIN17 were used for these functions

16 E USA Signal, fuel tank leak diagnosis pump Diagnostic module for fuel tank leakage
17 E USA Signal, fuel tank leak diagnosis heating Diagnostic module for fuel tank leakage

Could I have a coding issue on this DME which means a conflict between function ????

I did also try plugging in the ECA signal only into the JB4 PIN2 on the DB25 plug and E shows up correct. the analyzer is working as intended

All I can think is at fault is the DME coding is somehow causing the issue
Attached Images
    
Attached Images
File Type: pdf 2008 BMW 335i Wiring Diagram - DME.pdf (177.6 KB, 37 views)


BMW E92 335i N54 6AT,
JMC TUNING Single Turbo kit
Turbosmart BOV / 7.5 race IC / Fuel-IT PI kit,
JB4 G5, N20 Sensor, JB4 BT Connect, MHD BEF,
M3 Rear Subframe Complete swap + custom prop, front m3 wishbones, KWv3 Suspension,
Tuned by JSR

Last edited by DILUSI; 01-15-2022 at 02:42 PM..
Reply With Quote
(#2)
Old
DILUSI's Avatar
DILUSI DILUSI is offline
Junior Member
 
Posts: 69
Join Date: Jun 2015
Car: e92 335i N54 2007
Default 01-16-2022, 12:21 PM

So bit of an update

I installed my old dme msd80 and flashed it with a FF BEF. I had the same result with pin16 reading 4v when in fact I was feeding the 0.28v from the eca

I then thought to add some ethanol in the tank to increase the voltage to pin16 maybe this would help. No difference after adding E36

Only thing left to do is grab another eca dongle to plug into the analyser.


BMW E92 335i N54 6AT,
JMC TUNING Single Turbo kit
Turbosmart BOV / 7.5 race IC / Fuel-IT PI kit,
JB4 G5, N20 Sensor, JB4 BT Connect, MHD BEF,
M3 Rear Subframe Complete swap + custom prop, front m3 wishbones, KWv3 Suspension,
Tuned by JSR
Reply With Quote
(#3)
Old
temperamental's Avatar
temperamental temperamental is offline
Junior Member
 
Posts: 99
Join Date: Apr 2009
Car: 335i
Default 01-16-2022, 02:47 PM

You can check out this link to help with trouble shooting.

JB4 N54 Flex Fuel - Quick Guide - N54Tech.com - International Turbo Racing Discussion


JB4 Flex Fuel //MMP Stage 3 turbos//Custom Exhaust/BMS DCI//FMIC/KW suspension//Fuel-it Pi & Fuel it stage 4/BMS OCC's and too much to mention
Reply With Quote
(#4)
Old
DILUSI's Avatar
DILUSI DILUSI is offline
Junior Member
 
Posts: 69
Join Date: Jun 2015
Car: e92 335i N54 2007
Default 01-16-2022, 04:27 PM

Thank you for this thread I actually used this in my research

I've tested another dme and I had the same problem.

At this point I'm leaning with swapping the eca


BMW E92 335i N54 6AT,
JMC TUNING Single Turbo kit
Turbosmart BOV / 7.5 race IC / Fuel-IT PI kit,
JB4 G5, N20 Sensor, JB4 BT Connect, MHD BEF,
M3 Rear Subframe Complete swap + custom prop, front m3 wishbones, KWv3 Suspension,
Tuned by JSR
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump




vBulletin Skin developed by: vBStyles.com
Copyright 2007 - 2022, JB4tech.com