TCU Servo Error

Hi,

a little advice, on my pre checks I turn the ignition on and watch the TCU do one cycle. On the odd time the unit does not return to the stop and thus the waste gate is not fully closed, when the engine has run it all goes back to normal. The servo is holding the position so something is telling it this is the home position.

the cable is free and so is the waste gate  so it’s not that