Hello everyone, I have a ducato 2.3 jtd 120 06-> model in the workshop, it won't start, it won't unlock the immo code as it doesn't communicate with the can network, in fact in the engine ecu I find u0426 - electronic key, u1700 - communication with body computer, in ABS: u1700 communication with body computer and in body computer I find u1601 (D601 MM LOGIC) - can bus disconnected.

I have carried out the routine checks, 120ohm the engine ecu and body termination resistors, 60 ohm network integrity measurement between can h and can l, and 2.5v on both can H and can L, so I would rule out wiring problems, the suspicion given the errors is on the body as both the engine ecu and ABS cannot communicate with the body, while they can with each other; are there any further tests that can be carried out to ascertain whether the body has actually failed?

With the oscilloscope I have a chance to try, but I don't think it can make me discriminate which control unit is dumb.