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Fault code 46D1 crank no start

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5.6K views 2 replies 2 participants last post by  Pakieb  
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#1 ·
I’m new to inpa and bmw diagnostics but I’m having trouble with my e90 320d it was driving 110% until I parked it up for 3-4 months but then it just wouldn’t start the battery did die and the cas unit did lose sync but I resynced them with inpa but I’m getting constant error memory codes. 46D1 internal ecu 4 fault
4B90 fuel rail pressure fault I have tried everything but can’t seem to get it to start it’s cranking fine but no start
 
Discussion starter · #3 ·
Johnnyroper said:
Rail pressure fault will be causing the non start, could be a few different causes pressure sensor,wiring,hpfp failed,lpfp failed,injector fault stopping rail pressure building.
Or even given it also has internal fault of ECU it has had water ingress to ECU while it was stood?
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Johnnyroper said:
Rail pressure fault will be causing the non start, could be a few different causes pressure sensor,wiring,hpfp failed,lpfp failed,injector fault stopping rail pressure building.
Or even given it also has internal fault of ECU it has had water ingress to ECU while it was stood?
Click to expand...
Thanks for your reply I was thinking the ecu but I opened it up and couldn’t see any corrosion or signs of water damage but I will investigate that more . Also the ecu comes back as ok when I do a full scan. It says dde ok 2 error codes stored so I assumed it wouldn’t say ok if there was a problem but I’m new to inpa I’m still figuring out.
 
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