TURBO SPEED SENSOR VARIABLE TURBINE GEOMETRY (VTG) POSITION SENSOR The Turbo Speed Sensor informs the EMS of the turbo shaft speed. The sensor does not read from the vanes, but reads from the shaft. The Engine Management System (EMS) Module uses this signal in conjunction with the VGT position sensor signal to control the speed of the turbocharger and therefore optimize the intake manifold pressure. The Variable Turbine Geometry Smart Remote Actuator (VGT SRA) takes the position commands from the EMS, moves the nozzle of the turbocharger to the desired position, and performs all of the diagnostics and self checks on the actuator.
The Turbo Speed Sensor is mounted in the center of the turbocharger. Page 11 DESCRIPTION AND OPERATION