15
In addition, the size of the steer axle tires compared to
the drive axle tires also has to be within the ABS system
design. To avoid diagnostic trouble codes, the ratio of the
effective rolling circumference of the steer axle, divided by
the effective rolling circumference of the drive axle, must
be between 0.85 to 1.15.
CAUTION
: The ESP system effectiveness relies
on the accuracy of vehicle speed . If a major change
on the tire sizes occurs such that the odometer setting
needs to be changed, the Advanced ABS controller's
setting of tire sizes must be reprogrammed to new
values at the same time by a certified mechanic.
SYSTEM IMPACT DURING ACTIVE
TROUBLE CODES
ABS PARTIAL SHUTDOWN
Depending on which component the trouble code is
detected, the ABS, ATC, and ESP functions may be fully
or partially disabled. Even with the ABS indicator lamp
illuminated, the Bendix EC-60 controller may still provide
ABS function on wheels that are not affected. The ABS
system controller should be serviced as soon as possible.
Steer Axle ABS Modulator Diagnostic Trouble
Code
ABS on the affected wheel is disabled. ABS and ATC on
all other wheels remains active. ESP is disabled.
Drive Axle/Additional Axle ABS Modulator
Diagnostic Trouble Code
ATC is disabled. ABS on the affected wheel is disabled.
ABS on all other wheels remains active. ESP is disabled.
Steer Axle Wheel Speed Sensor Diagnostic
Trouble Code
The wheel with the diagnostic trouble code is still controlled
by using input from the remaining wheel speed sensor on
the steer axle. ABS remains active on the rear wheels.
ATC and ESP are disabled.
Drive Axle/Additional Axle Wheel Speed Sensor
Diagnostic Trouble Code
ATC and ESP are disabled. In a four sensor system, ABS
on the affected wheel is disabled, but ABS on all other
wheels remains active.
In a six sensor system, ABS remains active by using input
from the remaining rear wheel speed sensor on the same
side.
ATC Modulator Diagnostic Trouble Code
ATC and ESP are disabled. ABS remains active.
J1939 Communication Diagnostic Trouble Code
ATC and ESP are disabled. ABS remains active.
ECU Diagnostic Trouble Code
ABS, ATC, and ESP are disabled. The system reverts to
normal braking.
Voltage Diagnostic Trouble Code
While voltage is out of range, ABS, ATC, and ESP are
disabled. The system reverts to normal braking. When
the correct voltage level is restored, full ABS and ATC
function is available. The operating voltage range is 9.0
to 17.0 VDC for 12 volt systems, and 20 to 33.5 volts for
24 volt systems.
Steering Angle Sensor Diagnostic Trouble Code
ESP is disabled. ABS and ATC remain active.
Yaw Rate/Lateral Acceleration Sensor
Diagnostic Trouble Code
ESP is disabled. ABS and ATC remain active.
Brake Demand Pressure Sensor Diagnostic
Trouble Code
ESP is disabled. ABS and ATC remain active.
Load Sensor Diagnostic Trouble Code
ESP is disabled. ABS and ATC remain active.
Steer Axle TCV Diagnostic Trouble Code
ESP is disabled. ABS and ATC remain active.
Trailer PMV Diagnostic Trouble Code
ESP is disabled. ABS and ATC remain active.
