Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
Ignition status | BCM | This message is first sent to the GWM and then to the PSCM. Used to confirm the ignition status of the vehicle. |
Power pack status | PCM | This message is first sent to the GWM and then to the PSCM. Used to confirm the status of the operating mode; off - torque not available, on - torque not available, start in progress - torque not available or on - torque available. |
Power system status | BCM | This message is first sent to the GWM and then to the PSCM. Used to confirm the status of the vehicle battery and charging system. |
Stability control brake active | ABS | Used to confirm the operational state of the stability control system. |
Steering wheel angle | ABS | Used to verify the validity of the steering angle sensor. |
Suspension driver mode request | VDM | This message informs the PSCM of the current driver selected suspension mode; normal, comfort or sport. The PSCM adjusts the steering feel to match the suspension setting. |
Traction control brake active | ABS | Used to confirm the operational state of the traction control system. |
Vehicle configuration information | BCM | This message is first sent to the GWM and then to the PSCM. Used to compare the PSCM configuration against the vehicles specific configuration (central car configuration). |
Vehicle lateral acceleration | ABS | Used by the PSCM for steering assist calculations. |
Vehicle lateral acceleration | RCM | Used by the PSCM for steering assist calculations. |
Vehicle longitudinal acceleration | ABS | Used by the PSCM for steering assist calculations. |
Vehicle speed | PCM | This message is first sent to the GWM and then to the PSCM. Used to determine the level of assist supplied to the steering gear. |
Vehicle yaw rate | ABS | Used by the PSCM for steering assist calculations. |
Wheel speed data | ABS | Used to determine the level of assist supplied to the steering gear and to validate the steering wheel component angle by comparing the rotational speeds of each wheel. The difference in the speed of each wheel is used to derive a steering angle for comparison against the absolute steering angle message from the SASM. |
EPAS System
The PSCM controls the functions of the EPAS system and communicates with other modules over the HS-CAN2.
To activate, the EPAS system requires battery voltage and ignition voltage at the PSCM, the PSCM must communicate with other modules over the HS-CAN2 and the PSCM must receive the power pack status message from the PCM.
The main input for calculating the level of EPAS assist is the steering torque sensor signal (internal to the PSCM). Vehicle speed is also taken into consideration in order to achieve the vehicle speed dependent steering assist characteristic.
The EPAS gear uses an electric, reversible motor to apply the steering assist by moving the rack inside the steering gear. The motor is connected to the rack of the steering gear by a toothed belt and pulley-bearing assembly.
The PSCM continually monitors and adjusts steering efforts based on the steering torque sensor signal, motor position and HS-CAN2 inputs to enhance the feel of the steering system. As vehicle speed increases, the amount of assist decreases to improve and enhance road feel at the steering wheel. As vehicle speed decreases, the
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.