I don't have signal to the coils, no spark at all.

thanks Rick, i have checked all my relays and they are fine. I wonder where could the problem be...i now suspect my ECU.

ok thanks Rick, where is the system relay located

my volvo S80 2.9l 2003 model is giving me problems, is just cranking not starting. it started by flashing the engine light and stopped. i diagnosed it and got a system relay ECM 801A faulty. where is that relay located? Anyone help