Can Bus problems.

[Rawesh]

Hi, I have Mercedes sprinter w906 2013. I have problems with can bus no incorrect message from control unit s98 ACC / kla. No incorrect message from controller N73 Eis / Ezs ... No incorrect message from controller A1 Instrument and no incorrect message from control 15/5 ESM / EWM. Can someone please give some advice or tell me what I can do

 

[Tony Dyson]

You could carry out some limited tests with a good quality multimeter, but to interrogate the CAN-Bus you would need a two channel Oscilloscope to do the job properly. Start off with confirmation of the integrity of the EOL resistors, with the power off measure the resistance between CAN High and Low on pins 06 and 14 in the OBD 2 Port, you should read 60Ω +/- 5%.
With power on, probe for voltages in excess of normal parameters, >3.5v for CAN High, and 1.5v for CAN Low, if found unplug each listed module in turn while looking for the mitigation of any excess voltages found.

 

[Rawesh]

thank you so much for trying this. thank you again