I initially had a crank no start after work one day. After a couple of tries and no codes, it decided to start. I drove it home without issue 40 miles. Started fine the next day but then died at a stop light. It restarted immediately. Got it home and then it wouldn't start anymore. I thought maybe the battery was low after cranking on it so I hooked it up to the charger. Read a lot of posts about crank no start relating to the LPFP, and I realized I wasn't hearing it prime. It works with direct power applied and I have spark. I am having a consistent clicking coming from the R1 relay under the hood. My torque app says it's reading 2300psi of fuel rail pressure so I changed the rail sensor to no avail. I then replaced the fuse box in the passenger footwell as I was not getting power to the LPFP. I read that one owner had this problem and it was fixed when the HPFP was changed, but they did not mention a relay clicking all the time, so I'm not entirely convinced that is the problem. Could my ECM have taken a dump and be reporting such him fuel pressure when the car isn't even running? I'm not sure what other diagnosis to do with it and would love any thoughts or input. Before I spend all my money on parts that don't fix it. Thanks in advance.

 

I would suggest getting your hands on a BMW specific scan tool. They can sniff out errors that generic OBD scanners can miss.
I would also trust these tools to more accurately report fuel pressure readings.

 

Any suggestions on a scanner? I read that the Foxwell NT530 might be a good option.

 

I'm using BMW standard tools (aka Rheingold, ISTA-D) with a generic DCAN cable.
Cheap and works but the software can be finicky to get set-up correctly, especially if you're not computer savvy.

 

Good deal. I think I should probably opt for a more plug and play. I'm fairly good with computers, but would rather spend a little more and save myself some time. Looks like ECS is having a sale on the Schwaben Pro. Might have to pick one of those up.

 

I got a scanner ordered and will be pulling any Mini specific codes tomorrow. Hopefully that will shed some more light on what is going on. Thanks again for the help so far.

 

I had almost convinced myself that I had a DME issue with the constant clicking relay so I yanked it out one night and was about to send it out to get clonedfor a reman. I ended up getting the scanner and putting it back together to pull codes and ended up with a ton of fault codes. I'll put a list together and post them. I took a picture of each and then cleared the codes. The engine fired but would not stay running so I'm not out of the woods yet. I'll see what codes come back tomorrow night after the battery is charged up again.

 

A0B3-Starter Motor, terminal 50
A10A No Fault A0B4 Engine Start, Starter Operation A0B1- Input, Selector-Lever Position, implausible
A0C2- Output, terminal 50 RS
A0C1- Output, terminal 50 A0B2 Supply, Terminal 30E/30L
E734 No Message(Status, AUC)
E717 No Message (engine data, 1D0
E72D No Message (Position, Slide/Tilt Sunroof)
E715 No Message (Outside temperature,2CA
9C75 Undervoltage or Overvoltage
9C4A Fresh-Air/Recirculated-air flap motor
E738 No Message (Operation of wiper button), Receiver IHKA/IHKS, Transmitter SZL
9C90 Control Unit Fault
93FB No Message from DSC (road speed)
9408 Undervoltage During self-test
93D0 Undervoltage
9CC7 Hall sensor, power window, drivers door, faulty 9CC8 Hall sensor, power window, passenger door, faulty 9CB5 Battery Exhausted A8AB Dipped beam, right, Faulty A8AD Clearance light, right, faulty
A8AE FRM, MINI Brake Light, Left, Faulty
A8AF FRM, Mini, Brake Light Right, Faulty
A9AC Overvoltage DE51 Optical Wave Guilde, Communication Fault
931A KOMBI, Fuel-Level Sensor, Right 9319 KOMBI, Fule-Level Sensor, left
931D KOMBI, Undervoltage or overvoltage
931B KOMBI, Outside-temperature Sensor
A3A9 Message (steering column switch signal,0x1EE) Faulty, receiver KOMBI, Transmitter SZL
A3AC Message (Distance traveled, 0x1A6) Faulty, Receiver KOMBI, Transmitter, DSC
A3AD Message (engine data, 0x1D0) Faulty, receiver KOMBI,Transmitter DME-DDE
9E31 Undervoltage A169 Control unit Fault
C910 NO PT-CAN Message (DME/DDE)Invalid
A86D Relay, Heated read window/line to rear window 5E32 Control Unit, Voltage Fault, Overvoltage D367 Message error DME/DDE D366 Message error DME/DDE
D365 Message error DME/DDE
5DF7 Interface, Instrument-Cluster signal error 5E30 Control Unit, Voltage Fault
5DF0 DSC Sensor, Voltage fault 5E31 Control Unit, Voltage fault Undervoltage
D13E Fault, Message from control unit
604F RDC transmitter, Front left
604E RDC system

 

A cursory look at that list - two things jump out.
1. There's several codes for under voltage. This indicates a weak battery / alternator. When the voltage dips too low control modules can go haywire. Check this first.
2. There's a lot of codes related to communication errors between modules. This is usually caused by issues with CAN bus interference. This should be checked with an oscilloscope if you've determined #1 is ok.

 

I ended up getting it to fire and run one time ran good, but had half power engine light. Pulled code 2880. It has a brand new battery, but that doesn't mean it's good. I have another fuel high pressure pump I picked up this week and will change it out tomorrow. Thank you for all the help so far. I think I am in the home stretch.

 

Ok so new update. The got the fuel pump in and the car starts now. But I still have a 2880 and it runs rough. There is a good chance the pump I got wasn't any good, so I was expecting that. The one thing that I don't understand now though is my scanner is now instead of reporting 2300psi, it is reporting 0 psi at the fuel rail. Early in my attempt to diagnose the problem I changed the fuel pressure sensor, so I am thinking I will put the old sensor back in and order a new HPFP. Any other reason it would run but report 0 pressure at the fuel rail?

 

Error 2880 is likely from the fact that the DME is seeing 0psi fuel pressure.
This could be a faulty sensor or a problem with the lower pressure side of the fuel system not delivering fuel to the HPFP.

 

Changed the rail pressure sensor back and now I am back to crank no start. Except this time I can no longer communicate with the DME. All other modules respond fine. The plot thickens...

 

Got a used computer from eBay. It is read properly by the code scanner. Got the CAS out and will be getting shipped to get programed tomorrow.