Overview Of The Intake Manifold Tuning Valve (IMTV) System
The IMTV is a manifold tuning device that affects the airflow volume of the manifold by connecting multiple plenums or inlets within the manifold system. The IMTV control valve is located in the center of the intake manifold away from the intake valve or cylinder head. The IMTV system does not have to be monitored for OBD II regulations.
This subsystem provides increased intake airflow to improve torque, emissions and performance. The overall volume of air metered to the engine is controlled by the throttle body.
The IMTV is a motorized actuated unit mounted directly to the intake manifold. For additional information on IMTV components, refer to ENGINE CONTROL COMPONENTS .
The motorized IMTV unit is not energized below a calibrated RPM. The shutter is in the closed position not allowing airflow blend to occur in the intake manifold. Above a calibrated RPM the motorized unit is energized. The motorized unit is initially commanded ON by the PCM at a 100 percent duty cycle to move the shutter to the open position, and then falling to approximately 50 percent to continue to hold the shutter open.
- The PCM uses the TP sensor and CKP sensor signals to determine activation of the IMTV system. There must be a positive change in voltage from the TP sensor along with the increase in RPM to open the shutter.
- The PCM uses the information from the input signals to control the IMTV.
- When commanded ON by the PCM, the motorized actuator shutter opens up the end of the vertical separating wall at high engine speeds to allow both sides of the manifold to blend together.