1. Electronic Stability Control Systems
ESC
FMVSS 136
Electronic Stability Control Systems On
Heavy Vehicles

2. Electronic Stability Control (ESC).
Agenda
Electronic Stability Control  (ESC).
Developing the Platform
The Mandate – Truck Tractors/Busses
System / Societal Benefits
System Configuration
Component Additions
Diagnostics
Field Calibration

3. Federal Motor Vehicle Safety Standard (FMVSS)
ABS Mandates
Developing the Platform
Federal Motor Vehicle Safety Standard (FMVSS)
FMVSS 121 provides the mandates for Anti-Lock Braking Systems (ABS).
March 1, ABS required on all new air braked trucks/tractors
March 1, ABS required on all new air braked trailers
March 1, Power Line Carrier Communication (PLC)

4. Developing the Platform
ABS
+ brake stability
+ steerability
ABS + ATC
+ traction
+ drive stability
ABS+ATC+RSC
ATC Valve
Lateral
Accelerometer
RSC Valve

5. ESC Mandates
June 23, 2015, NHTSA published a final rule establishing Federal Motor Vehicle Safety Standard (FMVSS) No. 136, Electronic stability control systems for heavy vehicles.
FMVSS 136 provides the mandate for Electronic Stability Control Systems (ESC)
August 1, ESC on all new 3 axle truck tractors
August 1, ESC on new buses (motor coaches) over 33,000 GVWR
August 1, ESC on all other new truck tractors and Buses over 26,000 GVWR

6. Benefits of ESC
ESC
Continuously Monitors the vehicle’s rollover threshold
Activates to slow vehicle when threshold is exceeded.
Applies individual brakes to reduce directional instabilities
Utilizes ATC to transfer torque to wheels with best grip
Estimated to prevent between 1, ,759 crashes, injuries and between deaths annually.

7. ESC ESC + System Configuration ABS+ATC+RSC ESC Valve SAS YAW
Brake Sensors
ESC

8. ABS with Electronic Stability Control ESC
System Configuration
ABS with Electronic Stability Control ESC

9. Steering Angle Sensor (SAS)
ESC Additional Components
Steering Angle Sensor (SAS)
Senses steering wheel position to ECU
Must be calibrated using diagnostic tool whenever when replaced OR when any steering component is adjusted or replaced

10. ESC Additional Components
ESC Module
Contains:
Lateral accelerometer
Yaw rate sensor
Senses changes in body position about its vertical axis
ESC logic
Must be initialized anytime it or ECU is replaced
___________________________________________
Programmable Truck/Tractor ECUs

11. ESC Additional Components
Brake Pressure Sensor
Senses service brake pressure from driver brake application
Electrical output is proportional to air pressure input (IE: not an on/off switch)

12. ESC Diagnostics
TOOLBOX™ Software version 12 or higher REQUIRED

13. Steering Angle Sensor (SAS)
Field Calibration
Steering Angle Sensor (SAS)
The SAS Calibration must be done after an alignment has been performed or steering component replaced
Calibrated using diagnostic tool whenever when replaced OR when any steering component is adjusted or replaced
It is necessary to perform the SAS calibration prior to the ESC initialization.

14. Steering Angle Sensor (SAS)
Field Calibration
Steering Angle Sensor (SAS)
If SAS has NOT been replaced but vehicle has had an alignment performed or other steering components have been replaced, it is necessary to recalibrate SAS regardless of current calibration.

15. Steering Angle Sensor (SAS)
Field Calibration
Steering Angle Sensor (SAS) ON
Blinking
The SAS calibration is now completed. The ATC lamp will blink
continuously to inform driver ECU is in learning mode.
If SAS calibration fails; cycle ignition and retry calibration again.

16. Field Calibration ESC Module Blinking
The vehicle MUST come to a complete stop before starting the steering ratio calculation and turning the steering wheel 360 degrees for the first time.
Blinking

17. Field Calibration ESC Module ON
Straight Driving Adjustment is completed after ECU accumulated 800 feet @ 15 MPH, the ATC lamp will stop blinking and will remain ON. ON

18. Field Calibration ESC Module OFF
Once steering wheel is turned one revolution in either direction (360 degrees) accelerate slowly until 12 mph is reached.
Continue driving in a circle until the screen automatically changes to inform the
steering ratio is being calculated. Maintain the vehicle speed and conditions
until ATC lamp turns off.
OFF

19. Field Calibration ESC Module Blinking OFF
Turn the steering wheel 360 degrees in the opposite direction and repeat the driving conditions. The ATC lamp will start blinking when the required conditions are met. Keep driving in those conditions until the lamp turns off.
Blinking
OFF

20. Field Calibration ESC Module
Power down cycle time and sequence will vary amongst vehicle manufacturers. Some vehicles might require the key to be removed from the ignition for ignition power to be completely turned off.
Please follow the vehicle manufacturer procedure to make sure ignition is turned off. When the ignition is turned back ON, check that no active or stored faults are logged in the ECU and that the ABS and ATC/ESC warning lamps are OFF.

21. Electronic Stability Control (ESC).
RECAP
Electronic Stability Control  (ESC).
Developing the Platform
The Mandate – Truck Tractors/Busses
System / Societal Benefits
System Configuration
Component Additions
Diagnostics
Field Calibration

22. ESC =
Service Opportunity

23. THANK YOU