Car not starting

Hello,

There are 6 fuses and two relays that need to be checked for power here are the engine wiring diagrams so you can see how the system works and which fuses to check. Also we need to check the ECM and engine compartment power relays. Here are two guides and the fuse and relay locations as well:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Alright thank you sir. the fault code that I got when I was trying to test if the computer box is still working was no communication with cluster,electric position sensor drive and fuel pressure regulator valve.it has no engine light when I put the key 'on' position. The cranks only no start ,no fuel no spark. it can't read my diagnostic.

The car is Audi A3 2005 Automatic ..engine code BLR.

Yep it sounds like the cluster has gone out if all fuses and grounds are good. Here is a video of the job being done on similar car (steps and the same) with instructions in the diagrams below to show you how on your car:

https://youtu.be/_HEC44xENxw

Check out the diagrams (below). Please let us know what happens.