E90 325i N53B30 (MSD80) crank but no start


New Member
Nov 14, 2022

Sorry for the N53 post in the N54 thread... the car has the same DME at least.

I'm having issues with my car after a Carly connection was broken off while doing diagnostics on the car due to a bad injector.

The car stopped while driving after I exit the application without closing down the connection to the car before doing so (yes I feel like an idiot, but future me and past me did not discuss that before it all unfolded)

So the status of the car is:
- Cranks for days but yields no fuel smell, or happy running car sounds.
- Can't connect to DME with ISTA+. I do not have access to ICOM next equipment to use ISTA-P ( or the software for that matter)
- The fuel pump won't turn off while the ignition is turned on...
- Loads of random communication faults.
- DME relay works, I have not measured the voltage in the relay socket (to-do list is being created atm)
- DME has 12,8 volts between connector X01 pins 1 and 3 (see pic below...)​


- the fault in the car that ista+ was able to give was that there was a communication fault to the DME most likely due to a lack of power to the DME.

I'm wondering if I have bricked the DME software and would need a new overwrite of DME and CAS from the Stealership to be able to maintain happy engine noises...

Help is most appreciated.