2015 Nissan Rogue no start after accident. DTC: U1000

[borshch]

2015 Nissan Rogue doesnt start after accident.
DTC U1000 shows up under SRS, BCM and IPDM.
changed ECU, checked wiring and connectors.
still shows dtc 1000 and doesn’t start nor cranks.

[borshch]

I’m new to Diagnostics..

any my ideas of where to start looking for solution ?

[Matolek]

The communication network (CAN) communication link is open or shorted Faulty engine control module (ECM) Poor wiring harness grounding.

[borshch]

The communication network (CAN) communication link is open or shorted Faulty engine control module (ECM) Poor wiring harness grounding.

Already replaced ECM, still same errors come up.
Will start looking for ground wiring diagrams

[lexidime]

Already replaced ECM, still same errors come up.
Will start looking for ground wiring diagramsIf the fuse box under the hood is damage the rogue wont start there is a micro controller that controls the fuel pump and injectors located in the large black plastic box with fuses and relays in it. Thanks and rep me if this info helps

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[borshch]

Is there a way to check power to ecu/ecm + and ground pinout ?
In “quick scan” new Ecu is not detected, just like old one.
but when trying to acces it thru individual menu in Autel scanner it can’t detect ecu.
Want to check if it's getting power.
perhaps IPDM is bad ?
Visually checked wiring , all seems ok, but want to check power and can lines, but can’t find diagrams anywhere