Issue No communication to main controller -(R7404)

[Sanjaya]

There's an issue with a Bobcat skid steer-(T770) machine. Gateway controller shows as no communication on the display. After putting 2 new controllers it's the same. The machine doesn't start as well. Put new fuse, relay, original battery and check the wiring harness connectivity and there were no issues in them. All the other controllers got updated.

Should the gateway controller be plugged to the machine to update it? Or on a bench?

We purchased the controllers from Dubai through a bobcat dealer. One of their technicians came remotely and programmed it. Only the gateway shows as not found in the analyzer tool and machine display.

If there are anyone else who's had this problem please give a solution quickly....!!!!!

 

[SkidTracks]

How did you check the wiring harness connectivity (Visually, Volt-ohm meter, O-scope)?

Are you sure Gateway controller is getting power (+12v & ground) thru wiring harness connectors?
Are you seeing digital (CAN bus) signals at pins of connector going into / out-of Gateway controller?

 

[Sanjaya]

How did you check the wiring harness connectivity (Visually, Volt-ohm meter, O-scope)?

Are you sure Gateway controller is getting power (+12v & ground) thru wiring harness connectors?
Are you seeing digital (CAN bus) signals at pins of connector going into / out-of Gateway controller?

Hello sir,
Once the RH deluxe panel was replaced with a new one the main controller communication error was gone. Now the ACS and Drive+ controller are highlighted in blue. Both was not found. Attached the images of the new error codes. I ordered new ACS and Drive+ controllers.

Will it be fixed after we replace the 2 controllers?

Tell me what you think? What else should we check?