Active Exhaust System
| ITEM | DESCRIPTION |
|---|---|
| A | Active exhaust disabled |
| B | Active exhaust enabled |
The position of the active exhaust valves are set by the PCM .
The position of the active exhaust valves is dependent on:
- Engine speed.
- Accelerator Pedal Position (APP) sensor position signal.
- The selected mode by the active exhaust soft key or by the selected Terrain Response switchpack (TR) program.
When the vehicle shuts down, the active exhaust valves remain at the set position. On vehicle start up, 2 operation modes are available.
The operation modes are the following:
- Normal press and release on the 'Engine start' button - The active exhaust valves stay in closed position for a quiet start (regardless of the TR mode selection).
- Turn the ignition ON, select 'Dynamic' mode or select the active exhaust icon on the ICDM - The active exhaust valves open to enhance the exhaust sound.
When the active exhaust system is activated manually by touching the soft key, the ICDM notifies the IMC . The ICDM communicates with the IMC through the Automotive Pixel Link 2 (APIX2). The IMC then converts the signal, and sends a message to the BCM /GWM through the HS CAN comfort systems bus. The BCM /GWM sends the signal to PCM through the FlexRay bus.
The PCM sends a control signal which goes through the AEM, to operate the left and right actuators. If the signal state changes, each actuator should move. The movement is monitored by the AEM by measuring the supply current in each circuit between the AEM and the actuators. If the current is too small or occurs at the wrong time, the AEM concludes that the movement is incorrect. The AEM sets the actuators OFF and ON again to reset them. The AEM can therefore recover the valve operation in the case that the actuators are temporarily blocked, or suffer from a Radio Frequency (RF) susceptibility.