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2 Stability and Safety Enhancement Systems
9
Meritor WABCO Maintenance Manual MM-0112 (Revised 05-13)
Figure 2.7
Electronic Stability Control (ESC)
Electronic Stability Control (ESC) combines the rollover prevention of
Roll Stability Control (RSC) with directional stability in order to keep
the vehicle traveling on its intended path by providing spinout and
drift out control.
Like RSC, ESC is automatic. It becomes active when the system
senses imminent directional or roll instabilities, often before the
driver is aware. You will notice a difference in the vehicle when
stability control is functioning, but you should continue to drive as
normal and provide any additional needed corrections.
You may again notice a reduction in engine torque and additional
deceleration from the retarder, if so equipped. You also may notice
individual or all brakes applying depending on whether the vehicle is
in a roll or directional control event.
ESC Components
ESC is built from the ABS platform and uses many of the same
components as ATC and RSC. An active braking valve to control the
front axle brakes, a pressure sensor, an ESC module and a Steering
Angle Sensor (SAS) are required in addition to the components
necessary for RSC. Figure 2.8 and Figure 2.9. These components
are also described in the following section.
Note that for ESC applications on a non-towing vehicle (straight
truck), the trailer active braking valve is not required.
The ESC ECU is available in both Cab- and Frame-mounted
versions. The Universal Cab-Mounted ECU with ESC is an upgraded
version of the current Universal ABS ECU with a fourth connector
containing the necessary inputs/outputs required for full stability
control. The Frame-Mounted Advance ECU with ESC is an upgraded
version of the current ABS Frame-Mounted ECU with six additional
pins on both the X1 and X2 connectors of the ECU. These ECUs
support 4S4M, 6S4M and 6S6M vehicle configurations and are
compatible with 12V electrical systems. For pinout information, refer
to Section 6 of this manual.
Figure 2.7
4007813a
VALVE PACKAGE
INSTALLATION (REAR)
AIR LINES
ELECTRICAL LINES
4S/4M RSC/ATC
(ALSO AVAILABLE IN
6S CONFIGURATIONS)
VALVE PACKAGE
INSTALLATION (FRONT)
LAMPS
TRAILER STABILITY
CONTROL
MODULATOR
(OPTIONAL)
PRESSURE
SENSOR
(OPTIONAL)
ATC VA LVE
FRONT AXLE
ACTIVE
BRAKING
VALVE
(OPTIONAL)
TRACTOR
PROTECTION
VALVE
TRAILER ACTIVE
BRAKING
VALVE
- For E Version ECUs 1
- 12-Volt and 24-Volt Systems 1
- Contents 3
- 1 Introduction 5
- System Components 5
- ATC Components 10
- ATC Switch 10
- XX Orientation 11
- ZZ Orientation 12
- YY Orientation 12
- ESC Components 13
- Figure 2.8 14
- Hill Start Aid (HSA) 15
- Maintenance Information 16
- ABS Indicator Lamp 16
- Diagnostics 17
- TOOLBOX™ Software Diagnostics 17
- 4010611a 18
- 4010612a 18
- 4010613a 18
- 4010614a 18
- Definitions 19
- Clear Mode 20
- Blink Code Illustrations 22
- Blink Code Conditions 23
- Blink Code Identification 24
- Wheel Speed Sensor Testing 25
- Modulator Valve Testing 26
- BAYONET-STYLE CONNECTOR 27
- OPEN-STYLE CONNECTOR 27
- CAB MOUNT ECU’S: 28
- Figure 3.18 29
- 4010617a 30
- 4010619a 30
- 4010620a 30
- Electrical Checks 31
- Software 32
- Figure 3.26 or Figure 3.27 33
- PRESSURE SENSOR CONNECTOR 34
- ESC CAN Network Testing 35
- ESC Module Testing 35
- ESC Module Mounting 36
- ECU Circuit Testing 38
- Figure 3.44 40
- Figure 3.45 40
- 4 Component Replacement 41
- Hazard Alert Messages 41
- 472 500 30. 0 44
- MADE IN GERMANY 44
- 001 20/98 44
- DO NOT MOVE OR RELOCATE 49
- 6S/6M ABS 51
- 4S/4M ABS/ATC 51
- 4S/4M RSC/ATC 52
- 4S/4M ESC/ATC 52
- ECU Connector Pin Assignments 53
- ECU (Frame-mounted) 54
- 4004027d 55
- 4004030i 56
- Figure 6.8 57
- Figure 6.9 58
- Figure 6.10 59
- Figure 6.11 60
- Figure 6.12 61
- Figure 6.13 62
- Figure 6.14 63
- 7 SPN SID FMI Fault Codes 64
- SPN SID FMI Fault Code List 64
- 4010669a 88
- 4010670a 88
- 4010671a 88
- 8 Appendix I 89
- 9 Appendix II 91
- Troy, MI 48084-7121 98
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