3.13 Electronic Chassis Control

ELECTRONIC CHASSIS CONTROL                                                                                                    3.13

RIDER ENHANCEMENTS                                                   Propulsive Torque Management (PTM)
                                                                     PTM functionality follows traction control status.
linked Braking with Anti-Lock Brake System
(ABS)                                                                PTM limits the rate of torque increase available as a function
                                                                     of the vehicle position, such as under a cornering condition
For information about the ABS system, see ABS MODULE                 (lean angle). PTM works off of inputs from the IMU and WSSs
(Page 3-46).                                                         and is a function of TCS. When system detects that excessive
                                                                     throttle is being applied for conditions, the ABS module will
System Components                                                    request a reduction in engine torque.
The braking system includes the following:
                                                                     Drag-Torque Slip Control System (DSCS)
Wheel Speed Sensor (WSS) (front and rear): Reports wheel
speed data directly to the ABS module.                               The ABS module monitors rear wheel slip via the WSSs during
                                                                     a downshift or with throttle closed. When the ABS module
Inertial Measurement Unit (IMU): Reports lateral, longitudinal,      detects this condition, a torque command signal is sent to the
and vertical acceleration, as well as roll, yaw, and pitch to ABS    ECM until the rear wheel is no longer slipping. DSCS functions
module, ECM and BCM.                                                 at speeds over approximately 10 mph (16 km/h) and works
                                                                     with the ABS system to balance vehicle deceleration and rider
ABS Module: The ABS Module collects data from IMU and                control. DSCS is not selectable and cannot be disabled.
each WSS. Communicates with ECM and BCM to manage
brake application under extreme stopping and cornering               If the DSCS senses rear wheel slip because of powertrain
conditions. Controls Linking function described below.               deceleration it may decrease drag torque, by increasing engine
                                                                     rpm (Revolutions per minute), to limit slip and maintain control.
When ABS is activated, the solenoid valves decrease, hold or
increase hydraulic fluid pressure to control the individual          DSCS function is not adjusted for lean angle, performance of
calipers of each wheel to prevent wheel slipping.                    this feature was developed for straight-line use.

Traction Control System (TCS)                                        Vehicle Hold Control (VHC)
Traction control is selectable and can be turned off.                VHC uses the ABS module to hold brake pressure to keep the
                                                                     motorcycle from rolling backward when it is stopped on an
The cornering traction control system stored in the ABS module       incline.
constantly monitors the IMU and WSSs to observe the vehicles
lean angle during turns, and will adjust torque to the drive wheel   The ABS module senses the additional brake line pressure
by sending a signal to the ECM to reduce throttle input when         applied by the rider to activate VHC. VHC will activate when
it senses excessive rear wheel slip, or when necessary to            WSSs sense that vehicle is not moving, jiffy stand is up
improve vehicle control while cornering.                             (vehicles equipped with jiffy stand sensor), transmission is in
                                                                     gear (vehicles not equipped with jiffy stand sensor) and engine
During start up, the traction-control and ABS lamps flash            is running.
simultaneously indicating that both systems are waiting for the
vehicle to complete a wheel speed sensor check. The traction         The system holds brake pressure until deactivated by rider
control system is operational after startup even during the          pulling away from stop, lowering jiffy stand (vehicles equipped
wheel speed sensor check. The traction control lamp should           with jiffy stand sensor), shifting into neutral (vehicles not
turn off when the sensor check is complete.                          equipped with jiffy stand sensor), engine shutting off or auto
                                                                     deactivation from time or excessive heat in system.

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