Ford Kuga Service ManualFuel Charging and Controls - Turbocharger- 2.5L Duratec (147kW/200PS) - VI5 » Turbocharger (System Operation and Component Description)
Component Description
Component Description
Wastegate control valve
| Item | Description |
| 1 | from turbocharger (boost pressure) |
| 2 | from turbocharger (atmospheric pressure) |
| 3 | to boost pressure regulator (control pressure) |
The wastegate control valve operates as a cycle valve. The pressure acting on the membrane in the boost pressure regulator is controlled by appropriate pulsing of the wastegate control valve.
The pressure acting on the membrane in the boost pressure regulator is reduced when the wastegate control valve opens.
The operating voltage of the wastegate control valve is 12V.
The internal resistance of the wastegate control valve is 28.5 +- 1.5 Ohms.
The operating states are:
De-energised: gate open between 1 and 3
- Boost pressure high > wastegate control valve closed > boost pressure regulator open > turbine receives restricted exhaust gas flow.
Energised: gate open between 2 and 3
- Boost pressure low > wastegate control valve open > boost pressure regulator closed > turbine receives full exhaust gas flow.
Recirculated air valve
The recirculated air valve is a vacuum-controlled spring/membrane valve. If vacuum is applied to the recirculated air valve, the piston is pulled in against the spring pressure and a bypass bore is opened.
As the vacuum decreases, the spring pressure prevails and the piston re-closes the bypass bore.
System Diagram
System Operation
Component Description
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