2000 s80 wastegate and purge solenoid problems
 

I have a 2000 S80 T6. I have 3 engine codes on it which are P0448, P0245, and P0445. I have taken it to service, they told me Turbo Westegate solenoid and EVAP purge solenoid, and Air vent is getting low signal. hey think its a wiring issues, but they cant fix.

I have measured the signal on these selenoid, it's 3.65, i also located the wire (white) that comes from ECM to the solenoid and measured it right at where it lease the ECm, and it comes up the same.

Question:

1- Is the 3.65 a normal signal, or it has to be over 4.5
2- Since its the low valtage right where it leaves the ECM, is this something wrong with the ECM?
3- Where are the engine groung connections, i can only find 2, one at the valve cover, and the other one on the front bottom where engine and tranny connects. Am I missing one?

Thanks for all of the help...

Any reply on this is extremely important
Thanks in advance

seems like nobody has any idea, or dont wanna make comment... anyway, just and update, i have replaced the whole wiring harness for the engine, the codes are still the same, so i am thinking it's the ECM....