Condition
The engine control module (ECM) checks the boost pressure.
The diagnostic trouble code (DTC) is stored if the measured boost pressure from the boost pressure sensor (actual value) is higher than the control module target value (desired value).
The diagnostic trouble code (DTC) can be diagnosed when the engine speed (RPM) and load are above a certain value.
Substitute value
Reduced boost pressure through full opening of the boost pressure control valve.
Possible source
Pressure servo for the boost pressure control (BPC) valve is incorrectly adjusted
Sticking boost pressure control (BPC) valve
Damaged turbocharger (TC) control valve.
Fault symptom
Poor performance.
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This is what VIDA says about how the TCV is supposed to work:
Turbocharger (TC) control system
The boost pressure in the intake manifold is controlled by the boost pressure control (BPC) valves, whose pressure regulators (1) are affected by the pressure from the turbocharger (TC) (2).
The Engine Control Module (ECM) receives information about the actual throttle position via the throttle position sensor (TP) for the throttle unit (3), engine load, knocking etc. This affects the boost pressure that is permitted. The boost pressure is measured by the boost pressure sensor.
The control module regulates the control pressure using the turbocharger (TC) control valve (4), which controls the pressure to the boost pressure control (BPC) valves so that the control is adapted to the required pressure. See also: Design:Turbocharger (TC) control valve
The pressure regulators in the boost pressure control (BPC) valves are affected when the pressure rises. When the boost pressure has increased to the maximum permissible value, the boost pressure control (BPC) valves open. Some of the exhaust gases pass the turbine in the turbocharger (TC), limiting the boost pressure.
Turbocharger (TC) control is governed continually by the engine control module (ECM).
When a higher boost pressure is permitted, the control module opens the turbocharger (TC) control valve further. Some of the boost pressure which affects the pressure regulators for the boost pressure control (BPC) valves is released back into the turbocharger (TC) intake. This lowers the control pressure, the boost pressure control (BPC) valves open later and the boost pressure increases.
Because the control module calculates the boost pressure using the signal from the boost pressure sensor and the intake temperature sensor, there is automatic compensation of boost pressure control when driving at altitude and at different temperatures. As a result engine power will not be noticeably affected by the air density or temperature.
The engine control module (ECM) can diagnose the turbocharger (TC) control function.
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Turbocharger (TC) control valve
The turbocharger (TC) control valve is used to open and close the connection between the intake manifold and the pressure servo for the turbocharger (TC). The valve controls the pressure servo which affects the boost pressure control (BPC) valve and therefore the boost pressure. See also: Function:Turbocharger (TC) control system
The valve is an electro-magnetic valve which is powered from the system relay. When the valve needs to be opened, it is grounded internally in the engine control module (ECM). The valve can be controlled steplessly by grounding the valve using a pulse width modulation (PWM) signal.
The valve is closed when in the standby position (open-circuit).
The turbocharger control valve can be diagnosed and can be activated using VIDA.
The turbocharger (TC) control valve is on a bracket by the turbocharger.
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Also found this:
So, to me seems either the TCV lines are connected wrong or the wastegate actuator is too tight maybe??