Major JB4 install problem

obsidiansti · 01-05-2012, 05:39 PM

I need some help,

I went to install a pinout JB4 that I had purchased on here from another forum member. Once I gained access to the ECU, much to my surprise, there was what looked to be a JB3 installed. I uninstalled that and installed the JB4.

I started the car to a ridiculous amount of warnings. Things from "engine malfunction" to "transmission malfunction" and "DSC malfunction". The car would idle fine but you could barely drive it and it would die. I troubleshooted every connection and it looked fine. I was running out of daylight so I decided to put it back to stock. Unfortunately, its still doing the same thing.

What in the world could I have done to create this issue. I'm clueless at this point. I am stressing out pretty bad right now. Any and all suggestions would be helpful.

jayk877 · 01-05-2012, 05:42 PM

Quote:

Originally Posted by obsidiansti

I need some help,

I went to install a pinout JB4 that I had purchased on here from another forum member. Once I gained access to the ECU, much to my surprise, there was what looked to be a JB3 installed. I uninstalled that and installed the JB4.

I started the car to a ridiculous amount of warnings. Things from "engine malfunction" to "transmission malfunction" and "DSC malfunction". The car would idle fine but you could barely drive it and it would die. I troubleshooted every connection and it looked fine. I was running out of daylight so I decided to put it back to stock. Unfortunately, its still doing the same thing.

What in the world could I have done to create this issue. I'm clueless at this point. I am stressing out pretty bad right now. Any and all suggestions would be helpful.

Any pics of the ECU? are you sure it was a JB3 u pulled out and not something else? Post sum pics and i might be able to help you or someone else will, But we need to see what u pulled out and what it looks like now!

obsidiansti · 01-05-2012, 05:55 PM

I just assumed it was a JB3 bc it looked identical to what I was installing. I'll post pics in a sec.

obsidiansti · 01-05-2012, 05:59 PM

This is what I pulled out.

chili36 · 01-05-2012, 06:05 PM

That^^ is an old jb3.

Mike@N54Tuning.com · 01-05-2012, 06:09 PM

Sounds like you should put it back to stock and take it to a professional. The pin out harness isn't even sold anymore so maybe its time to upgrade that to the PNP harness JB4.
*
Mike

obsidiansti · 01-05-2012, 06:28 PM

Quote:

Originally Posted by Mike@N54Tuning.com

Sounds like you should put it back to stock and take it to a professional. The pin out harness isn't even sold anymore so maybe its time to upgrade that to the PNP harness JB4.
*
Mike

It is back to stock and still having the same issues. I'm fairly adept at these things. I followed the directions verbatim and double checked everything. I'm guessing that something might have gotten messed up in the process that probably isn't related to the JB4 install at all. I'm just looking for suggestions on where to look.

caliguy562 · 01-05-2012, 07:26 PM

Was there a Dp fix on the jb3? If so, you may need to revert the pins on the stock connector back to stock. Things get moved around with a Dp fix installed.

SteveMD · 01-05-2012, 07:40 PM

The JB4 pinout is different to the JB3 pinout. I had a JB3 pinout and didn't want to spend $$$ on the PnP harness when I upgraded. I have the instructions written down somewhere but found them on Terry's site. It's three or four wires that have to move.

Terry would be the one to help you out.

obsidiansti · 01-05-2012, 09:42 PM

Quote:

Originally Posted by caliguy562

Was there a Dp fix on the jb3? If so, you may need to revert the pins on the stock connector back to stock. Things get moved around with a Dp fix installed.

I did notice and extra adapter that was coming out of the JB3. You can see it in the pic I posted. It wasn't plugged in when I opened up the ECU so I don't think that would have affected anything. I'm not really sure what that was for.

obsidiansti · 01-05-2012, 09:48 PM

After looking up the DP fix, that appears to be what is still attached. Its on the small black subconnector. Could that be the cause of my issues or is it likely something else?

obsidiansti · 01-05-2012, 09:57 PM

Quote:

Originally Posted by Cynical

Your wires are wrong somewhere in the connectors and are the connectors aligned right to the dme?
Did you bend any pins on the dme?

There are no bent pins on the dme and I went through each connection to ensure that they were correct on two different occasions. I'm sure its possible that I made a mistake so I'll check again tomorrow.

obsidiansti · 01-05-2012, 10:08 PM

Quote:

Originally Posted by Cynical

just out of curiosity are u unplugging the battery each time?
And when you installed the JB4 did you try to clear the codes?

I did unplug the battery and when I tried to clear codes the car went crazy and died.

cn555ic · 01-05-2012, 10:15 PM

Did you uninstall each wire and replace it back to stock one at a time..Its going to be a nightmare for you if you have to trace what wire you messed up putting back into the stock ecu subconnectors because wires look all alike!

obsidiansti · 01-05-2012, 10:17 PM

Quote:

Originally Posted by Cynical

I only suggest this cause for some reason I don't have the black part that the connectors click into in lairs as it attaches to the dme. I've had a connector a slot over by mistake and the car had the same symptoms.

Which piece are you talking about that you are missing? That could help me narrow it down.

obsidiansti · 01-05-2012, 10:18 PM

Quote:

Originally Posted by cn555ic

Did you uninstall each wire and replace it back to stock one at a time..Its going to be a nightmare for you if you have to trace what wire you messed up putting back into the stock ecu subconnectors because wires look all alike!

yeah, I did it one by one to make sure they went back where they were supposed to.

cn555ic · 01-05-2012, 10:20 PM

Quote:

Originally Posted by obsidiansti

yeah, I did it one by one to make sure they went back where they were supposed to.

Okay...if thats the case then at least it makes it easier..

Mike@N54Tuning.com · 01-06-2012, 06:25 AM

Maybe you mixed up the o2 sensor wires having it all apart. Make sure the one going to small black spot #6 has a number stamped on the insulation like 525.

Mike

obsidiansti · 01-06-2012, 08:47 AM

Quote:

Originally Posted by Mike@N54Tuning.com

Maybe you mixed up the o2 sensor wires having it all apart. Make sure the one going to small black spot #6 has a number stamped on the insulation like 525.

Mike

I just checked and it does indeed have 525 stamped on it.

obsidiansti · 01-11-2012, 11:33 AM

I just wanted to update this in case anyone else has the same issue. Thanks to Terry's pics of the stock wire setup, I was able to find that I had one wire one slot over. I fixed it and everything worked perfectly. Thanks for all of the suggestions!

Zach335i · 09-12-2015, 12:42 AM

Quote:

Originally Posted by obsidiansti

I just wanted to update this in case anyone else has the same issue. Thanks to Terry's pics of the stock wire setup, I was able to find that I had one wire one slot over. I fixed it and everything worked perfectly. Thanks for all of the suggestions!

Do you still have the old jb3 that came with your car?

01-05-2012, 05:39 PM	#1
obsidiansti Private 5 Rep 64 Posts Drives: . Join Date: Apr 2007 Location: . iTrader: (1)	Major JB4 install problem I need some help, I went to install a pinout JB4 that I had purchased on here from another forum member. Once I gained access to the ECU, much to my surprise, there was what looked to be a JB3 installed. I uninstalled that and installed the JB4. I started the car to a ridiculous amount of warnings. Things from "engine malfunction" to "transmission malfunction" and "DSC malfunction". The car would idle fine but you could barely drive it and it would die. I troubleshooted every connection and it looked fine. I was running out of daylight so I decided to put it back to stock. Unfortunately, its still doing the same thing. What in the world could I have done to create this issue. I'm clueless at this point. I am stressing out pretty bad right now. Any and all suggestions would be helpful.
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01-05-2012, 05:55 PM	#3
obsidiansti Private 5 Rep 64 Posts Drives: . Join Date: Apr 2007 Location: . iTrader: (1)	I just assumed it was a JB3 bc it looked identical to what I was installing. I'll post pics in a sec.
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01-05-2012, 05:59 PM	#4
obsidiansti Private 5 Rep 64 Posts Drives: . Join Date: Apr 2007 Location: . iTrader: (1)	This is what I pulled out.
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01-05-2012, 06:05 PM	#5
chili36 Lieutenant 6 Rep 461 Posts Drives: 335i Join Date: Dec 2007 Location: So.Cal iTrader: (1)	That^^ is an old jb3.
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01-05-2012, 07:26 PM	#8
caliguy562 Lieutenant 8 Rep 476 Posts Drives: E92 335i Join Date: Dec 2007 Location: garaged somewhere in soCal iTrader: (3)	Was there a Dp fix on the jb3? If so, you may need to revert the pins on the stock connector back to stock. Things get moved around with a Dp fix installed.
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01-05-2012, 06:09 PM	#6
Mike@N54Tuning.com Joint Chiefs of Staff 4918 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	Sounds like you should put it back to stock and take it to a professional. The pin out harness isn't even sold anymore so maybe its time to upgrade that to the PNP harness JB4. * Mike
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01-05-2012, 07:40 PM	#9
SteveMD Colonel 196 Rep 2,485 Posts Drives: 2016 F10 535i MSport Join Date: Dec 2005 Location: Raventown! iTrader: (3)	The JB4 pinout is different to the JB3 pinout. I had a JB3 pinout and didn't want to spend $$$ on the PnP harness when I upgraded. I have the instructions written down somewhere but found them on Terry's site. It's three or four wires that have to move. Terry would be the one to help you out. __________________ 2006 E90 330i (retired) 2009 E90 335i (retired) 2012 E70 X5 50i M Sport (retired) 2016 F10 535i M Sport
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01-05-2012, 09:48 PM	#11
obsidiansti Private 5 Rep 64 Posts Drives: . Join Date: Apr 2007 Location: . iTrader: (1)	After looking up the DP fix, that appears to be what is still attached. Its on the small black subconnector. Could that be the cause of my issues or is it likely something else?
	Appreciate 0 Quote

01-05-2012, 10:15 PM	#14
cn555ic 441 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	Did you uninstall each wire and replace it back to stock one at a time..Its going to be a nightmare for you if you have to trace what wire you messed up putting back into the stock ecu subconnectors because wires look all alike!
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01-06-2012, 06:25 AM	#18
Mike@N54Tuning.com Joint Chiefs of Staff 4918 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	Maybe you mixed up the o2 sensor wires having it all apart. Make sure the one going to small black spot #6 has a number stamped on the insulation like 525. Mike
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01-11-2012, 11:33 AM	#20
obsidiansti Private 5 Rep 64 Posts Drives: . Join Date: Apr 2007 Location: . iTrader: (1)	I just wanted to update this in case anyone else has the same issue. Thanks to Terry's pics of the stock wire setup, I was able to find that I had one wire one slot over. I fixed it and everything worked perfectly. Thanks for all of the suggestions!
	Appreciate 0 Quote