Hi. A month ago got Check Engine with p0046:Turbocharger / Supercharger Boost Control "A" Circuit Range.
As an immediate consequences - rpm were limited by 2000 by Toyota computer. After 1-2 starts during next 3 days error got away but on next day it was there again(
Got a scanner. Turned out MAF sensor values were rather OK, but MAP values with engine off showed 77 kPa (27 Hin) instead of smth close to barometric pressure around 99 kPa (29 Hin), almost no change in value with engine start. Engine on idle is stable. While driving sensor values were changing almost as expected.
First - air and MAP sensor filters were changed for new ones - no result, MAF and MAP sensors cleaned - no result. Bought cheap analog for Toyota original MAP sensor - NTY ECM-TY-005. Strangely the value of new MAP sensor without engine on changed for 185 kPa. Then I made reset for ECU - no change. No other visible problems found (tubes, cables, turbo itself - all seem good).
Could anybody recommend any other way to solve the problem or to make some different tests?
Thanks in advance!