[boostedmkIII]

Hi everybody, Iam new to this site, but have had supras for the past 7 years. my current problem is on my 88 7mgte. The motor was built 3 years ago but the people that installed it broke 6 bolts on exhuast side of head. So for the cars first 12,000 miles the turbo was not operating correct. Now that problem has been fixed the car will only boost 4psi? I have done all sensor checks everything is ok, time set(10btdc). Iam getting a code 11 from diag/ ECU power sorce? any help would be great!!!!!! thanks