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      05-07-2019, 06:40 PM   #1
iFURY
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135i N54 JB4 MAP 5 FAULTS 29E2, 29F2

I have an issue with my JB4 MAP 5. When i pull my car on 3-4 gear that shut down my car and goes into limp mode (half engine check light). i read my fault codes with MHD and i have 2 errors: 29E2 - Fuel injector rail, pressure-sensor signal and 29F2 - Fuel high-pressure system, fuel pressure. Any ideas how to fix that? can i change my FOL with my steering wheel controlls?
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      05-07-2019, 07:12 PM   #2
dtla1
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Not sure what FOL means, but those codes indicate HPFP to me. I would uninstall JB4, clear codes, drive it around and see what codes might come back up.
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      05-08-2019, 07:36 PM   #3
drwillb
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Do you have the fuel pressure sensor wires on your JB4 harness? If no, then you absolutely need to add them.

You need to log a run and look at your FP-HP channel as well as the trims channel to evaluate your pump.

FOL is Fuel Open Loop. This adds extra fuel when running WOT. Increasing FOL value will lower Trims value but only as long as the HP pump has enough headroom.

Last edited by drwillb; 05-08-2019 at 07:42 PM..
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      05-09-2019, 05:50 AM   #4
iFURY
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I change the value of FOL from 90 to 75 and now im fine.
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