Mazda 626 with no spark
 

Hello.
I have a Mazda 626 year 1992 with a problem. A couple a days ago The car suddenly stop while i drive. The reason is no spark. I have replaced the distributor and also change the cap and rotor but still no spark. Checked the fuses but not found any of them broken.
What should i search for and check in the next step? Can i in any way check that The ECU is correct and where is the ECU placed?
Anyone that can give me a suggestion?

/Kent