Limp Mode 535d 500776

by **Loadinge30** » Fri Mar 15, 2019 10:59 am

Engine goes into limp after 4000rpm with R90 pump and 100or105mg. Any ideas? Limiters changed.
2 codes 45a0 rail pressure plausibility control, 4a70 Map FMTC trq2qBas MAP wrong.

by **jurebv** » Fri Mar 15, 2019 10:32 pm

post original to compare

by **Lambda1** » Mon Mar 18, 2019 7:48 pm

Failure is in Railpressure ... you use originale sensor. Dont know exact value but should be 1400bar +-50bar hys.
use 1800bar sensor and rescale.

by **Lambda1** » Tue Mar 19, 2019 12:31 am

sorry see I be wrong, its M57N2 ... so should be 1800bar sensor. So 1750bar + hysterese of 50bar.
But problem should be same :D, need sensor which can read more.

by **Loadinge30** » Sat Apr 06, 2019 8:49 pm

Lambda1 wrote:sorry see I be wrong, its M57N2 ... so should be 1800bar sensor. So 1750bar + hysterese of 50bar.
But problem should be same :D, need sensor which can read more.

Missed Rail pressure limiter was the cause. All fixed now running 390hp!