Audi TT 225bhp will not start, Help please (Tame Technician)

[t955daytona]

Hi,
I have a 2000 TT 225bhp with the APX engine. The car will not start, it cranks over as normal but the EPC light does not light when the ignition is on. I have tried to look for fault codes but neither my Snapon scantool or VAGCOM can interrogate the ECU. I have had the ECU checked by a specialist who says there are no faults with the ECU. There appears to be power going to the ECU loom which I checked with a multimeter. Is there anything else (Relays etc) that I may need to check, the fuel relay does not switch but I think that is because the ecu does not seem to be switching on so that is not activating the fuel relay. I am at my whits end!! Thanks for any information.

[Tame Technician]

If you have no comms with the ECU, the ECU isnt working, Its either missing a power or ground, or its duff.

[Colonial]

A friend with a Mk 4 Golf 1.8t had this issue on an intermitent basis.

The connector to the ECU was the duff bit so a morning spent doing some basic electrical repairs fixed it up.