Intake Manifold Tuning (IMT) Valve

Intake Manifold Tuning (IMT Valve)

Figure 98: Intake Manifold Tuning (IMT) Valve (Refer to the On-Board Diagnostics II System Overview for icon definitions.):

Figure 99: 2.0L 2v Focus/Escort Intake Air System:

Figure 100: 2.5L Contour/Mystique/Cougar Intake Air System:

Figure 101: 3.0L LS6 Intake Air System:

3.8L Windstar Intake Air System:

Figure 103: 4.2L E/F Series Intake Air System:

Figure 104: 4.6L E/F Series Intake Air System:

Figure 105: 5.4L (4V) Intake Air System:

The intake manifold tuning (IMT) valve (Figure 98) is a motorized actuated unit mounted directly to the intake manifold. The IMT valve actuator controls a shutter device attached to the actuator shaft. There is no monitor input to the PCM with this system to indicate shutter position.

The IMT valve motorized unit will not be energized below approximately 2600 rpm or higher on some vehicles. The shutter will be in the closed position not allowing airflow blend to occur in the intake manifold. Above approximately 2600 rpm or higher, the motorized unit will be energized. The motorized unit will be commanded on by the PCM initially 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.

1. The PCM uses the TP sensor and CKP signals to determine activation of the IMT valve system. There must be a positive change in voltage from the TP sensor along with the increase in rpm to open the shutter.
2. The PCM uses the information from the input signals to control the IMT valve.
3. 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.