good afternoon, have you solved this issue, if so, how?

found this on an E29 code for the nissan systems:
E-29 Self shutdown system fault
1. ECCS C/U self shutoff does not activate properly.

unfortunatly there is no troubleshooting checklist section on this error code that i can find. Maybe someone else has experienced this error and knows where to look, during the years of dealing with these systems i have never come across this code before so not sure where to start other than the usual places, connectors, relays, fuses, etc.