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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > JB4 question..BMW computer cannot communicate?



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      09-29-2012, 09:27 AM   #1
driftbrick744
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JB4 question..BMW computer cannot communicate?

After installing the JB4 on my 07 335xi, it seems as if the BMW diagnostic computer cannot communicate with the car. Do I need to change the map that the JB4 is on to allow BMW to communicate with my vehicle? I am starting to hear the dreaded wastegate rattle, and the car is still under warranty..just want to be sure BMW can communicate with the vehicle before I bring it in. Thanks!
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      09-29-2012, 09:39 AM   #2
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You need to put it in map 0.
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      09-29-2012, 09:59 AM   #3
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You need to put it in map 0.
+1. Put it on map 0.
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      09-29-2012, 10:38 AM   #4
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If they DO replace the turbos, chances are they will reset the ECU though..won't the JB4 come in the way here?
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      09-29-2012, 10:46 AM   #5
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if you're bringing it in (or brought it in) take the JB4 out! Unless one of the techs or Service manager is a family member I would not leave the JB4 attached.
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      09-29-2012, 06:32 PM   #6
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Mine needed to be taken out and you should just in case of dealer issues
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      09-29-2012, 09:22 PM   #7
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Map 0 should be fine for plugging in a diagnostic computer. My Autologic cannot read a JB4 car unless it is in Map 0 with the engine running or not. With a Procede, I can read it in any map as long as the engine is not running. Once it is running, it has to be in Map 0.
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      09-30-2012, 07:31 AM   #8
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Thanks for the advice, guys. I have heard the rattle occasionally when letting off the accelerator. After watching videos of the wastegate rattle, it sounds like it. The car has 78K miles on it, so I am hoping to bring it in and have it warrantied before the mileage runs out!
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