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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > How do I properly remove the JB4?



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      06-07-2012, 12:59 PM   #23
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if you're in socal just take your car to Terry and he will uninstall and remove it properly; hes about 30 mins away from Glendale ... btw let me know if you want / need any of my parts, I will be parting out soon
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      06-21-2012, 10:58 AM   #24
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well I'm out of warranty so don't care. If I set to Map 0, can the dealer read the codes like normal, or it needs to be fully taken out? I'm getting limp mode occasionally and think it's a sensor.
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      06-24-2012, 07:21 PM   #25
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Quote:
Originally Posted by 335 oClock
if you're in socal just take your car to Terry and he will uninstall and remove it properly; hes about 30 mins away from Glendale ... btw let me know if you want / need any of my parts, I will be parting out soon
What r u parting out?
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      03-08-2013, 06:10 PM   #26
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
With a piggy like the JB4 the ECU never sees values other then stock like. As for removing. Clear the codes if any from the steering wheel, turn off power, lock the doors and remove the JB4.

Enjoy a much slower driver to the dealer

Mike
ive been gettin hpfp codes but only under heavy boost when the car is shifting gears in 1st,2nd, sometimes 3rd... car is going to the dealer on wed for the hpfp warranty and the battery cable recall...im not sure if i take the jb4 out if i can replicate the fuel pump misfires while stock...if i just remove the jb4 and leave the codes do u think bmw will find out? my only codes are the exhaust flap, radiator bind, and the fuel pump code
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      03-30-2013, 08:22 PM   #27
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
With a piggy like the JB4 the ECU never sees values other then stock like. As for removing. Clear the codes if any from the steering wheel, turn off power, lock the doors and remove the JB4.

Enjoy a much slower driver to the dealer

Mike

I just had to remove my jb4 since I'm getting my turbos replaced under warranty.
I did clear the codes, but I didn't mess with my maps at all.
Was I supposed to put it back to map 0 before I removed the jb4?
I kept it at map 5, just cleared the codes, waited 10 minutes, then removed it.
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      03-30-2013, 08:48 PM   #28
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Quote:
Originally Posted by MasterWang View Post
I just had to remove my jb4 since I'm getting my turbos replaced under warranty.
I did clear the codes, but I didn't mess with my maps at all.
Was I supposed to put it back to map 0 before I removed the jb4?
I kept it at map 5, just cleared the codes, waited 10 minutes, then removed it.
No makes no difference once its out, as long as you cleared the codes.
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      08-15-2013, 12:41 PM   #29
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ah crap. i took jb4 out and didnt clear codes. is there anything i can do otherwise to clear codes?
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      08-22-2013, 03:46 AM   #30
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Quote:
Originally Posted by fl0wmastr
ah crap. i took jb4 out and didnt clear codes. is there anything i can do otherwise to clear codes?
I believe there is a separate can tool you can buy for reading and deleting codes. Or you can take it to a shop that can read and delete the codes for you but that will cost money. I'd say reinstall your jb4 and delete the codes.
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      08-22-2013, 06:43 PM   #31
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Quote:
Originally Posted by SRT14PimPin07
Quote:
Originally Posted by fl0wmastr
ah crap. i took jb4 out and didnt clear codes. is there anything i can do otherwise to clear codes?
I believe there is a separate can tool you can buy for reading and deleting codes. Or you can take it to a shop that can read and delete the codes for you but that will cost money. I'd say reinstall your jb4 and delete the codes.
I have a N55 JB4 stage 2 with all the updated firmware. I am taking my car in for an oil change Monday. How do I clear the codes? I was going to clear them then put it to map 0.
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      08-22-2013, 11:01 PM   #32
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Originally Posted by TrentOSU View Post
I have a N55 JB4 stage 2 with all the updated firmware. I am taking my car in for an oil change Monday. How do I clear the codes? I was going to clear them then put it to map 0.
Easiest way would be to plug it into your computer and do it through the JB4 software.
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      08-22-2013, 11:02 PM   #33
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Quote:
Originally Posted by SRT14PimPin07
Quote:
Originally Posted by TrentOSU View Post
I have a N55 JB4 stage 2 with all the updated firmware. I am taking my car in for an oil change Monday. How do I clear the codes? I was going to clear them then put it to map 0.
Easiest way would be to plug it into your computer and do it through the JB4 software.
With the USB? I didn't buy the USB and if I'm right, you can clear it with the JB4 in your car?
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      08-22-2013, 11:09 PM   #34
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Originally Posted by TrentOSU View Post
With the USB? I didn't buy the USB and if I'm right, you can clear it with the JB4 in your car?
Yes you can. Put it in map 1. Then put the speedo at 1 and the RPM's at 3. That will enable auto clear. once you do that. Put it in Map 0 and you can remove the Jb4.

http://www.n54tech.com/forums/showthread.php?t=13189

Here is where you can find a lot of information if you ever need it.
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      07-01-2015, 03:56 PM   #35
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I am considering purchasing a 2011 BMW that had a JB4 tune. They are taking everything off and returning to stock. Since I won't have JB4 anything, is there a way to check for codes or clear it without the JB4 tool or addon?
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      07-01-2015, 06:01 PM   #36
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Quote:
Originally Posted by Beemw335 View Post
Make it easier for yourself, unhook battery, remove tune and reconnect battery.
Yeah that's the best way..why risk it when unhooking ithe battery is so easy? I know some say they let the ecu sleep and one guy said he takes his on and off all time and doesn't even wait. I'm not playing ecu roulette to save an extra 2 min task.
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      09-29-2015, 02:02 PM   #37
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I need quick help - my car had a couple "yellow overheat" warnings before and I suspected that it was due to the water-pump. So, I disabled my jb4 by doing 0/0 (Map 0) right before I got into the dealer. Then, their technician called and said they couldn't read any code because I had the "auto code clear" on all the time. So, they couldn't move forward without reading the code, and I am taking the car back now.

Here are my questions:

1) If i keep my jb4 disabled (0/0), would the "auto code clear" still function? Or I still have to turn it off (1/3)?

2) If I enable JB4 (0/5) and turn off "auto code clear" (1/3), when the warning comes on again, will the code be stored and I can take it back to the dealer?

3) Would the "yellow overheat warning" generate a code to be stored? If so, can I read it thru JB4 steering wheel method after it happens??

4) If my dealer is cool about the JB4 as long as they can read the codes, can I leave it disabled or I still need to take it out?

Last edited by EnjoyDriving; 09-29-2015 at 03:35 PM.
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      09-29-2015, 05:25 PM   #38
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Quote:
Originally Posted by nachob View Post
I am considering purchasing a 2011 BMW that had a JB4 tune. They are taking everything off and returning to stock. Since I won't have JB4 anything, is there a way to check for codes or clear it without the JB4 tool or addon?
There is one on Amazon that costs about 70 bucks. It displays the codes, and tells what they mean. Easy to clear codes with it. Search "BMW code reader." A good tool.
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      09-29-2015, 08:19 PM   #39
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Quote:
Originally Posted by EnjoyDriving View Post
I need quick help - my car had a couple "yellow overheat" warnings before and I suspected that it was due to the water-pump. So, I disabled my jb4 by doing 0/0 (Map 0) right before I got into the dealer. Then, their technician called and said they couldn't read any code because I had the "auto code clear" on all the time. So, they couldn't move forward without reading the code, and I am taking the car back now.

Here are my questions:

1) If i keep my jb4 disabled (0/0), would the "auto code clear" still function? Or I still have to turn it off (1/3)?

2) If I enable JB4 (0/5) and turn off "auto code clear" (1/3), when the warning comes on again, will the code be stored and I can take it back to the dealer?

3) Would the "yellow overheat warning" generate a code to be stored? If so, can I read it thru JB4 steering wheel method after it happens??

4) If my dealer is cool about the JB4 as long as they can read the codes, can I leave it disabled or I still need to take it out?

Your tech knew what he was talking about when he said Uti clear was on, which means he may beok with the jb4. You need to turn off auto-clear, it is effective in all maps. Drive for a bit let it store new codes, since auto clear may have cleared them, which I doubt because mime stayed while I had my auto clear on. Anyhow, turn off auto clear, drive the car let it overheat and theb take it back, codes are stored for atleast a week or so in the DME.

Personally I always take my jb4 out, every dealer is different.
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      09-29-2015, 10:42 PM   #40
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Thanks for the input. That is what I am going to do, and I actually disable it (0/0) instead. Actually, JB4 is simple enough for most people, but I still remember the pain i went thru with those sensor plugs and would like to avoid fiddling with the ECU wiring as much as possible. My local dealer seems to be pretty cool with it, maybe because the bill will be going to my extended warranty company. Therefore, I would not want take it off and put it back on if not 101% needed :-)



Quote:
Originally Posted by Dhillon92 View Post
Your tech knew what he was talking about when he said Uti clear was on, which means he may beok with the jb4. You need to turn off auto-clear, it is effective in all maps. Drive for a bit let it store new codes, since auto clear may have cleared them, which I doubt because mime stayed while I had my auto clear on. Anyhow, turn off auto clear, drive the car let it overheat and theb take it back, codes are stored for atleast a week or so in the DME.

Personally I always take my jb4 out, every dealer is different.
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      09-30-2015, 01:54 AM   #41
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Originally Posted by EnjoyDriving View Post
Thanks for the input. That is what I am going to do, and I actually disable it (0/0) instead. Actually, JB4 is simple enough for most people, but I still remember the pain i went thru with those sensor plugs and would like to avoid fiddling with the ECU wiring as much as possible. My local dealer seems to be pretty cool with it, maybe because the bill will be going to my extended warranty company. Therefore, I would not want take it off and put it back on if not 101% needed :-)
Hope you are correct. I have an aftermarket extended warranty as well. I hated the install, although it was easy, but still a pain.
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      09-30-2015, 07:24 PM   #42
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If you are not under warranty, just put the JB4 in pass through mode (map 0) and go to a 3rd party shop that services BMWs.

If you still want to remove the JB4, just reverse the directions - unplug the JB4 from the various sensors and plug the sensors back in to the stock harness. I never locked the doors and waited for the ECU to go sleep. However, it takes 10 mins to remove all the stuff to enable access to the sensors anyway.
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      10-07-2015, 11:09 AM   #43
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Disconnect battery negative terminal. Begin unplugging all connector clips and plug the stock harness back into sensors. Canbus wires need to be heat gunned if you managed to put those glue wire covers back on. Once all connectors are plugged into each sensor correctly and nothing is loose, plug negative battery terminal back in and you are good to go. Just removed my jb4 the other day with ill effects doing it this way.
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      10-07-2015, 12:20 PM   #44
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I just did the exact steps last night, and successfully removed my JB4. Unfortunately, i am not a handy man and it still took me about 2 hours to complete. However, i am so glad that I found the "USB" method to allow me to unplug those connectors

If anyone else is fighting with those connectors, basically stick an usb to keep the tab disengaged and pull them out - BINGO!!


Quote:
Originally Posted by trixdout View Post
Disconnect battery negative terminal. Begin unplugging all connector clips and plug the stock harness back into sensors. Canbus wires need to be heat gunned if you managed to put those glue wire covers back on. Once all connectors are plugged into each sensor correctly and nothing is loose, plug negative battery terminal back in and you are good to go. Just removed my jb4 the other day with ill effects doing it this way.
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