DTC U0104-00: Lost Communication With Cruise Control Module: General Description

The Smart Cruise Control (SCC) system has additional function which helps to keep safe distance from the car ahead as compared with conventional cruise control system. System operation process is as follows.

1. SCC detects vehicles ahead with radar sensor.
2. SCC calculates acceleration value according to distance and speed.
3. SCC transmits acceleration request to ESP through CAN communication.
4. When deceleration is needed, ESP performs brake control. But when acceleration is needed, ESP calculates engine torque request and sends it to PCM via CAN communication.
5. PCM performs acceleration control after receiving torque request.

The Forward Collision-Avoidance Assist (FCA) system is designed to avoid collision or reduce damage from an accident caused by delayed braking or insufficient braking power due to driver distraction. System operation process is as follows.

1. FCA uses a radar sensor and MFC uses a camera sensor to detect vehicles ahead with data fusion. (local CAN)
2. FCA process data and controls vehicle using fusion detection data.
3. FCA calculates required deceleration speed depending on the speed/distance of vehicles ahead.
4. FCA transmits the calculated "required deceleration speed" to ESP through (CAN communication).
5. ESP calculates the required torque to implement "required deceleration speed" and then controls the brake control (CAN communication).