Engine/Transmission (1998.5 - 2002) Turbo Question

[chazj]

I've already experienced at P0234 Code suggesting turbo overboost. No problem was found & the code has been reset.



Am curious as what controls the boost of the turbo charger. I am surmising that the ECM is the primary controlling factor with the waste gate opening as a fail safe measure in the event the PSI doesn't come down fast enough?



If so... at what pressure does the wastegate "open"? and at what PSI is a "Code" generated in the ECM indicating overboost?



Thanks for enlightening me.

 

[SnoKing]

The waste gate is what determines the amount of boost. If it sticks closed than you could get an over boost condition. Stock trucks normally see around 180-20 lbs of boost. Something around 23 is over boost. SNOKING