Traced problem to EFI relay wiring. Been stranded several times because of this concern. I've replaced the relay. The vehicle will start if red wire under relay is connected to another power source( I'm assuming it should be powered on it's own). Since I don't have a wiring diagram , my question is,what provides power to this wire?Is it the ECM ,or does it come directly from the fusebox? Also ,the check engine light is not lit with key on,engine off unless you provide power to this red wire. Can anyone help? It would be much appreciated.
