Motor-Boost Pressure Servo: Operation
WARNING: This page is about a different car, the 2006 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
| 1 - COMPRESSOR HOUSING |
| 2 - GUIDE VANE |
| 3 - GUIDE STUD OF GUIDE VANE |
| 4 - GUIDE STUD OF CONTROL LINKAGE |
| 5- ADJUSTING RING |
| 6 - TURBINE HOUSING |
| 7 - TURBINE WHEEL |
| A - TURBO INLET (FRESH AIR) |
| B - TURBO OUTLET (COMPRESSED AIR) |
| C - EXHAUST GASES TO TURBINE WHEEL |
| D - EXHAUST OUTLET |
The turbocharger boost pressure servomotor receives a PWM signal from the ECM.
At low speed, the turbocharger boost pressure servomotor reduces the flow cross section of the guide vanes. See Fig 1(2). The speed at which the exhaust gas impacts on the turbine wheel is increased, as a result of which the speed of the turbocharger and thus the charge pressure rises.
At high engine speed, the turbocharger servomotor increases the flow cross section of the guide vanes. See Fig 1(2). The speed at which the exhaust gas impacts on the turbine wheel is reduced, as a result of which the speed of the turbocharger reduces and the charge pressure drops.