2
REVISED 5/31/05
The ESP system only functions within the limits of
physics.
ESP functionality mitigates potential vehicle stability
incidents, but cannot prevent them in all cases. Other
factors such as driving too fast for road, traffic or weather
conditions, oversteering, an excessively high vehicle Center
of Gravity (CG), or poor road conditions can cause vehicle
instability that is beyond the capability of any stability
system to mitigate. In addition, the effectiveness of ESP
can be greatly reduced on vehicles towing multiple trailer
combinations.
CAUTION
The ESP stability system may only be used on vehicles
tested and approved by Bendix engineering. ESP
installations require on-vehicle testing and EC-60 parameter
tuning. See "Advanced ABS with Stability Control" on page
9 for further details.
Accordingly, the EC-60 controller is provided with a
corresponding parameter data set that is validated for a
specific vehicle platform. Therefore, specific steps are
necessary should a replacement ECU be required. See
“Obtaining a New EC-60
™
Controller” on page 13 for further
details.
ESP-equipped vehicles should not be driven on high-
banked roads – such as those found on high-speed test or
race tracks. Test personnel must have ESP functionality
disabled prior to operating an ESP vehicle on such
tracks.
YAW CONTROL (YC)
Advanced ECU can include Yaw Control (YC) functionality,
which has the ability to apply brakes to individual wheel
ends, as well as applying the trailer brakes to counteract
trailer “push” that, during certain maneuvers, could lead to
a loss of control or a jackknife incident. See "Yaw Stability"
on page 9 for further details.
ROLL STABILITY PROGRAM (RSP)
The Bendix Roll Stability Program (RSP), is an all-axle
ABS solution that helps reduce vehicle speed by reducing
the engine's throttle and applying all vehicle brakes as
needed, reducing the vehicle's tendency to roll over. RSP
focuses on reducing the vehicle’s speed below the critical
roll threshold during direction-changing maneuvers such as
driving on curved highway exit ramps or obstacle avoidance
maneuvers on dry, high friction surfaces. See "Advanced
ABS with Stability Control" on page 9 for further details.
WARNING
During an RSP system intervention, the vehicle
automatically decelerates. RSP can slow the vehicle
with or without the operator applying the brake pedal,
and even when the operator is applying the throttle.
COMPONENTS
The EC-60
™
controller’s ABS function utilizes the following
components:
• Bendix
®
WS-24
™
wheel speed sensors (4 or 6,
depending on configuration). Each sensor is
installed with a Bendix Sensor Clamping Sleeve
• Bendix
®
M-32
™
or M-32QR
™
Pressure Modulator
Valves (4, 5, or 6 depending on configuration)
• Dash-mounted tractor ABS Indicator Lamp
• Service brake relay valve
• Dash-mounted trailer ABS Indicator Lamp
• Optional blink code activation switch
• Optional ABS off-road switch
The EC-60
™
controller ATC function utilizes the following
additional components:
• Drive axle traction control valve (may be integral
to the service brake relay valve or a stand-alone
device)
• Dash-mounted ATC status/indicator lamp
• J1939 serial communication to engine control
module
• Stop lamp switch input (may be provided using the
ECU hardware input or J1939)
• Optional ATC mud/snow switch (sometimes referred
to as an ATC off-road switch)
Delivery
(Port 2)
Supply
(Port 1)
Exhaust (Port 3)
Electrical
Connector
M-32QR
™
Modulator
M-32
™
Modulator
FIGURE 2 - BENDIX
®
WS-24
™
WHEEL SPEED SENSORS
FIGURE 3 - M-32
™
AND M-32QR
™
MODULATORS
90° Speed
Sensors
Straight Speed
Sensors
Sensor
Clamping
Sleeve
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