Ok, I'm having some problems. I had the classic problem where the car won't start when it's hot. Sometimes have to let it cool off and get it to start. Once I get it to start it would drive fine. Did some research and found the most classic problem is the main relay. I was just dealing with it for awhile, then I decided to go ahead and take care of the problem. I went ahead and replaced it today. Now my D4 light is flashing, CEL, and the car won't start at all. What happened? At least before I was able to still get it to start eventually and go where I needed to go. Now I can't get it to start whatsoever. All I did was replace main relay. Tried putting the old one back in and same thing.

 

Never mind guys, I just blew the ECU fuse. All seems ok for now.

 

did you replace it with a new one or old one?