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Home >> Ford >> 2017 >> C-Max Energi Titanium >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System (Abs) And Stability Control >> Description And Operation >> Anti-Lock Brake System (ABS) And Stability Control - System Operation And Component Description >> Roll Stability Control (RSC)
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Roll Stability Control (RSC)

The ABS module continuously monitors the vehicle motion relative to the intended course. This is done by using sensors to compare the steering wheel input and the stability sensor input (yaw rate, lateral acceleration, longitudinal acceleration and roll rate) with the actual vehicle motion.

The SASM sends the steering wheel angle and rate of change information to the ABS module over the HS-CAN while the RCM sends stability sensor information to the ABS module over a private HS-CAN. If the ABS module determines from the inputs the vehicle is unable to travel in the intended direction, it modulates the brake pressure to the appropriate brake caliper(s) by opening and closing the appropriate solenoid valves inside the HCU while the hydraulic pump motor is activated.

At the same time the ABS module calculates how much engine torque reduction is required to reduce vehicle speed to help stabilize the vehicle and sends this torque reduction message to the PCM over the HEV HS-CAN. The ABS module also sends a stability event message to the GWM over the HEV HS-CAN, the GWM relays the stability event message to the IPC over the MS-CAN. When the PCM receives the torque reduction message, it adjusts engine timing and decreases fuel injector pulses to reduce the engine torque to the requested level. When the IPC receives the stability event message, it flashes the stability-traction control indicator (sliding car icon). Once the vehicle instability has been corrected, the ABS module returns the solenoid valves in the HCU to their normal position, deactivates the hydraulic pump motor and stops sending the traction event and torque reduction messages. The PCM returns engine timing and fuel injectors to normal operation and the IPC extinguishes the stability-traction control indicator (sliding car icon).

RSC does not operate with the transmission in REVERSE. RSC is disabled if there is a wheel speed sensor, stability sensor or steering angle sensor DTC present in the ABS module. RSC is also disabled if there is a communication error between the ABS module and the SASM or the RCM. When RSC is disabled, the ABS module sends a message to the GWM which gateways the message to the IPC over the MS-CAN to illuminate the stability-traction control OFF indicator (sliding car OFF icon).

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