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Turbo question

smog c6 Aug 24, 2018

  1. smog c6

    smog c6 New Member

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    hi the turbo on my 2.7 tdi 2005 a6 has died. I’ve bought a new gtb1756 for it but this is the wrong turbo, there appears to be a bv50 with the VDO actuator on it. I thought all 2.7 tdi’s have the gtb1756 turbo with hella actuator. Is this correct?
     

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  3. smog c6

    smog c6 New Member

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    So I have now replaced the Turbo, however new faults have cropped up.

    The reconditioned turbo is p/n 059 145 715E

    The car drives really well and it feels like theres more power and its smoother, than with the previous turbo before it became faulty.

    I am however getting Fault codes below, and I tested the car with a good run and discovered the car goes into limp mode (flashing glow plug light and low/no boost) around 3700 revs or more, this doesnt occur before that.

    P3348 - Control Circuit for Controller for Turbocharger 1 (J724): Electrical Malfunction
    P0234 - Boost Pressure Regulation, Limit Exceeded (Overboost Condition)

    OBD2 - confirmed:
    P0046 - Turbocharger/Supercharger Boost Control "A" Circuit Range/Performance

    OBD2 - pending:
    P0234 - Turbocharger/Supercharger "A" Overboost Condition
    P0046 - Turbocharger/Supercharger Boost Control "A" Circuit Range/Performance

    Any ideas what this may be? I feel like the VDO actuator needs to be calibrated.
     
  4. smog c6

    smog c6 New Member

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    Just following up, I have noticed when unplugging the connector to the turbo and replugging it the actuator stutters at the top position when going through its movemement. I have read online it is possible to adjust the turbo via loosening the 3 10mm bolts holding the actuator to the bracket and allowing the actuator to set its position and then tightening.

    Could anyone with more experience exlpain how to do this, as I understand currently once the bolts are loosened someone should cycle the ignition from off to on, this would allow the actuator to test its motion. If it was physically outside the limits of its motion the actuator could now adjust as the bracket is now loose once position which allows the actuator to move through its full range of motion is found bolts should be tightened.

    This method only works if the refurbed turbo has the same range value as the old one, eg if old one was say 19-79% and this refurbed one was 23-83% it would work as the range is 80%.

    Am I understanding this correct?
     

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