Cranks no start

[mazda915]

Ok guys iv looked and searched and nothing so getting a little frustrated . Recently i bought hec mx with the klze turbo i installed the hei mod and started right up. Drove the car for three weeks runs good and all . Then last night my gf was driving it and it cranks but don't start . First thing i checked was the cel light . It doesn't turn on when i have the ignition key on nor the oil light or charge light . Only lights on cluster is the brake light and seat belt light . So i checked the fuses to the engine inside the cabin and its good i checked the main fuse which is the one that is bolted down and its good now my next step to check the main relay on the engine bay i hope its that so just wanted some one else's advise i wanted to check power at the pcm but don't know which wire to check

[RobMinhas]

So, if I'm reading this right, you've got a turbo KLZE? If thats the case you most likely have an aftermarket engine management system, I'd check to see if that's still good and the wiring to it is as well if it's a standalone that is not plug and play.

[mazda915]

It has the stock k8 ecu and it ran ok with it for three weeks until last night i even switched with an other k8 ecu

[mazda915]

Ok so today I fixed the mx looked at the wire diagrams and traced the power wire to the PCM from the engine fuse box bay the wire is white with red and it had an open circuit so the voltage wasn't goin to the PCM so I fixed it a d boom the PCM has voltage cel light tunred on and started right up best feeling ever .