Troubleshooting guide

47
For more information, visit www.bendix.com or www.foundationbrakes.com • 1-800-AIR-BRAKE (1-800-247-2725)
Adapter
To Towing
Vehicle
J560
Connector
To Trailer
Connector
Troubleshooting Truck, Tractor
and Trailer ABS
Bendix ECU controllers contain self-testing diagnostic
circuitry that continuously checks for the normal
operation of internal components and circuitry, as well as
external ABS components and wiring. See the Service
Data Sheet for the ABS controller for full troubleshooting
information.
Diagnostic Trouble Codes: General
When an erroneous system condition is detected, the
ECU controllers:
• Illuminate the appropriate indicator lamp(s) and
disengage part or all of the ABS and ATC functions;
• Place the appropriate diagnostic trouble code
information in the ECU memory; and
• Communicate the appropriate trouble code information
over the serial communications diagnostic link as
required.
Depending on the ECU, the diagnostic trouble codes
may be retrieved using “blink codes” (using the dash or
trailer ABS indicator lamp), by attaching to the vehicle
diagnostic connector a hand-held diagnostic tool, such
as the Bendix Remote Diagnostic Unit (RDU
™
), using a
PC-based diagnostic tool such as the Bendix
®
ACom
®
Diagnostics program, or by reading the LEDs on the front
of the ECU (such as on the Bendix
®
EC-30
™
controller).
Bendix
®
RDU
™
(Remote Diagnostic Unit) for
Trucks and Tractors
The Bendix RDU tool provides the technician with a
visual indication of ABS component Diagnostic Trouble
Code (DTC) information. The RDU tool is specifi cally
designed for use with Bendix ABS systems and allows
the technician to:
• Troubleshoot ABS system component problems using
Diagnostic Trouble Code reporting via LEDs;
• Reset Diagnostic Trouble Codes on Bendix ABS ECUs
by holding a magnet over the reset in the center of the
RDU tool (for less than 6 seconds); and
• Enter the Self-Confi guration Mode used by Bendix
ABS ECUs by holding a magnet over the reset area
for greater than 6 seconds but less than 30 seconds.
The trailer version of the RDU tool is called the Bendix
®
Trailer Remote Diagnostic Unit (TRDU
™
). The Bendix
TRDU is typically used along with a 7-pin-to-7-pin adapter
plugged into the J560 connector of the towing vehicle. It
provides power for the unit and provides the technician
with a visual indication of Antilock Braking System (ABS)
component DTC information. The tool communicates
LED Lights
Illuminate
Diagnostic
Trouble
Codes
(Blue Label)
Troubleshooting ABS
Located on
Dash Panel
Located Under
Dash Panel
Or
Bendix
®
TRDU
™
shown with
adapter
across PLC, and provides DTC reporting via LEDs and
the reset of trouble codes.
Bendix
®
Trailer Information Module
The Bendix Trailer Information Module is a display device
that combines the functionality of system diagnostics
with the ability to display and store other trailer-related
information of value to an operator, driver or technician.
Typically mounted on the trailer, it is able to record events
that occur during vehicle operation.
(Black
Label,
Gold
Lettering)
LED Lights
Illuminate
Diagnostic
Trouble Codes
(10 LEDs)
Typical Vehicle Diagnostic Connector Locations
Bendix
®
Remote Diagnostic Unit (RDU
™
)
Bendix
®
Trailer Remote Diagnostic Unit (TRDU
™
)