Active Exhaust System
| ITEM | DESCRIPTION |
|---|---|
| A | Active exhaust disabled |
| B | Active exhaust enabled |
The position of the exhaust valves are set by the Powertrain Control Module (PCM).
The position of the exhaust valves is dependent on:
- Engine speed
- Accelerator Pedal Position (APP) sensor position signal
- The selected mode by the active exhaust switch or the Terrain Response (TR) switchpack.
When the vehicles shuts down, the active exhaust vanes are closed by default.
On vehicle start up, different modes are available.
North American Specification (NAS) and Rest of World (ROW) vehicles, the operation modes are:
- Pressing and holding the Engine start button - The active exhaust vanes stay in closed position for a quiet start.
- Normal press and release on the Engine start button - The active exhaust vanes open to enhance the exhaust sound.
For EU6d vehicles, the operation modes are:
- Normal press and release on the Engine start button - The active exhaust vanes stay in closed position for a quiet start.
- Select the active exhaust icon on the Interactive Control Display Module (ICDM). Then press and release the Engine start - The active exhaust vanes open to enhance the exhaust sound.
When the active exhaust system is activated manually by touching the soft key, the (ICDM) notifies the Infotainment Master Controller (IMC). The ICDM communicates with the IMC via the Automotive Pixel Link 2 (APIX2). The IMC converts the signal and sends a message to the Body Control Module (BCM/GWM). The message is on the High Speed (HS) Controller Area Network (CAN) comfort systems bus. The BCM/GWM transmits the signal to PCM via the FlexRay bus.
The PCM sends a control signal to operate the active exhaust actuators via a hardwired connection to the Active Exhaust Module (AEM). The AEM intercepts this control signal and feeds it independently to 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 happens at the wrong time then the movement is deemed to be erroneous. The actuators are powered off then on to reset them by the AEM. The AEM can therefore recover the valve operation in the case that the actuators are temporarily blocked or suffer from an Radio Frequency (RF) susceptibility.