Wonder if anyone can help here, I am 40 yrs Auto electrician with a right odd fault on above Nissan.. Will not start but cranks over fine. All lights go out but no fuel rail pressure, can read all systems no fault codes, but 7 times out of ten I get U1000 in airbag bcm clocks and no comms with engine ECU if I earth out engine relay all comes back on line, but still no fuel pressure.engine relay control wire is off ECU and if I pin it out brings relay on line and Have comms and no fault codes but still no start. fitted new IPRE fuse box under bonnet and still no joy. Pinned out all can line and all good at 60 ohms, cleaned and removed all earths and run separate earth to BCM ABS ECU but still no joy. Can not see or here prime pump in tank if it has one, any one had or heard of this fault.