+- CarTechnoloGY (https://cartechnology.co.uk)
+-- Forum: Discussions All about Software and Hardware (https://cartechnology.co.uk/forumdisplay.php?fid=310)
+--- Forum: Automotive Help & Discussions / Software and Hardware (https://cartechnology.co.uk/forumdisplay.php?fid=40)
+---- Forum: BMW - Mini - Rolls Royce (https://cartechnology.co.uk/forumdisplay.php?fid=61)
+---- Thread: FEM Not working with ENET but works wtih DCAN (/showthread.php?tid=90498)
FEM Not working with ENET but works wtih DCAN - armenh7 - 25-03-2024
Vehicle: 2017 BMW 440i
Background information:
Client approached me with a no start issue. Codes in DME indicated EWS timeout. Scanned with ISTA and found lack of communication with modules on PT-CAN. After a bit of diagnosis, discovered there was a break somewhere between the KOMBI and FEM as the resistance was reading 120 instead of 60. Bridged the wires below which resolved the issue in regard to resistance and PT-CAN. All repairs were performed with the battery disconnected. Car was able to start successfully.
Issue:
All diagnosis was performed over ENET. Now, I'm unable to scan the car via ENET but DCAN works fine. OBD port has power and ground. When plugging in an MHD black wifi adapter, it creates the wifi network therefore indicating it has power and ground. The same adapter was being used prior to the repair to scan the car and it worked with no problem. The adapter was tested on another vehicle and it connected successfully. I was hoping it was just a coincidence but unfortunately I tried with an ENET cable and the issue persists. The computer does not detect anything on the ethernet port and the MHD adapter doesn't show a connection with the vehicle has been initiated (there's a green LED that lights up when connected). The OBD port pins 6 and 14 read 60 ohms indicating the terminating resistor is good but that doesn't matter for ENET. The OBD port pins all have continuity to the FEM for the ENET connections.
I tried undoing the repair for the PT-CAN and communication over ENET was not restored. I tried unplugging the headunit (it's the only module that uses ENET) and communication was not restored. We have tried disconnecting and reconnecting the battery multiple times to no avail. The car functions fine (engine runs and drives, cluster works, HVAC works, etc). Unfortunately, the client does not have a donor FEM to try out. It is not a computer setup issue because it was working before and the MHD adapter is no longer able to initiate a connection with the car. There are no faults in the FEM.
Only this thread had something similar to what I was experiencing but his tool32 commands didn't lead to anywhere. I tried on my own car with a DCAN cable and the IP reading 0.0.0.0 is expected.
RE: FEM Not working with ENET but works wtih DCAN - Marx - 28-03-2024
check the fuses on FEM... not sure which one, but pretty sure one fuse is burnt
RE: FEM Not working with ENET but works wtih DCAN - armenh7 - 01-04-2024
(28-03-2024, 21:44 PM)Marx Wrote: check the fuses on FEM... not sure which one, but pretty sure one fuse is burnt
Checked multiple times and they're all good.