Immo off or fault finding/bypass CAN? Citroen C3 1.4i 2004

[DeLuXe]

Hi,

I have a big issue with a Citroen C3 1.4i 2004.
I have tried most of the things, even immo off but dont know for sure it was done correctly or what the next step will be.
Original BSI + ECU files + 2 version immo off attached below.

This car have hard time starting because of the U-fault codes, problem in CAN network and absence of communication with ECU/BSI and other units with can protocol in car.

I tracked down a fault to ABS connector wich was filled with grease so I cleaned it and put all things togheter, started the car and all faults erased automaticly by themselves.

But this have happen before as well, before I cleaned the plug.. Next time a person want to start the car it throws same fault codes again and again, car will be very very very difficult to start.

I have tried making immo off, changed bsi, ecu, coded keys, cleaned abs plug, stripped wires to see if something is loose/cut, cleaned all earth points to chassi and other parts of the car, checked all fuses...

Nothing seem to work, maybe someone here have been in same situation / same fault codes ?
Or is it a way to bypass CAN somehow with emulator or by cables?

ABS:
U1000
U1308
U1318

ECU:
U1000 - Communication between the engine management ECU and the other ECUs on the network (CAN)
P0568 - Cruise Control Set Signal Malfunction
P0571 - Cruise Control

BSI:
87C - Absence of Communication with the Engine Management ECU

---------------------------------------------

CAR INFO:
Citroen C3
1.4i
2004
Engine code: KFV (TU3JP)


Thank you for all the help.

Best regards,
DeLuXe

[gia]

Did you try to disconnect the ABS connector and see if the car starts? if it enters the diagnosis in the engine

[gia]

If I'm not wrong, the CAN line between ECU and BSI goes inside the ABS. The ABS control unit is connected in series to the CAN line
If I'm not wrong, the CAN line between ECU and BSI goes inside the ABS. The ABS control unit is connected in series to the CAN line

[DeLuXe]

Thanks for the information and your information is correct.


I will try to disconnect the plug and try to start the car or if it enters diagnostics to ECU tomorrow.


If connection to or ABS is faulty then I suspect only clean ABS changing should solve the problem yes ?
Because its weird after cleaning ABS plug it started the car but not when car got cold after some hours, so I believe issue lays there as well.


I will try and report tomorrow, thank you for now


Best regards,
DeLuXe

[DeLuXe]

Hi,


Removed ABS plug, connected to car engine + bsi with same fault code, car didnt start.
Connected another ABS module with same numbers, same thing.
Got another engine fuse box = same thing and fault codes.


Any ideas please?


Best regards,
DeLuXe

[rafal]

change ecm.....................there probably will be problem

[esse]

Hi,
just unplug the ABS is not enough you need to connect the can in and out

[DeLuXe]

change ecm.....................there probably will be problem

That might be the issue, i will swap eeprom and 29f chip tomorrow to donor ECU with exact same numbers because immo off didn't help to donor ECU :/