Sky L4-2.0L Turbo (2008)
1 - Turbocharger Wastegate Solenoid with Duty Cycle at 0 percent
2 - Compressor
3 - Turbine
4 - Regulating Pressure
5 - Exhaust Gas Pressure
6 - Spring Force
7 - Turbocharger Wastegate Actuator
When certain DTCs are set the ECM will limit the amount of available boost pressure. Limiting boost pressure is accomplished by the ECM controlling
the TC wastegate solenoid and maintaining the duty cycle at 0 percent. This means that the ECM will not actively close the wastegate during greater
engine loads. The system at this point is limited to mechanical boost. Mechanical boost means that the wastegate will still move, but the amount of
motion is limited by the mechanical properties of the return spring within the actuator, the pneumatic properties of the actuator, and the physics of the
exhaust gas flow in the exhaust system. In this mode of operation the manifold pressure will attain a maximum pressure of 140 kPa.
The TC wastegate actuator assembly has a threaded rod and nut that connects the diaphragm of the actuator to the wastegate. This rod is adjusted to
BorgWarner(TM) factory specifications and is not adjustable.
