Bendix Commercial Vehicle Systems EC-80 ABS ATC SD - Manual (Page 17)

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Bendix ® RDU ™ Communication Problems
If the ABS ECU does not respond to the RDU tool’s
request for Diagnostic Trouble Codes, the RDU tool will
illuminate each red LED in a clockwise pattern. This pattern
indicates the loss of communication and will continue until
the ABS ECU responds and communication has been
re‑established.
Possible sources of communication problems are:
1. A problem with the J1939 link at the in‑cab off‑board
diagnostic connector (9‑Pin).
2. The ECU does not support PID194.
3. No power is being supplied to the ECU and/or the
diagnostic connector.
4. The J1939 bus is overloaded with information and the
RDU can not arbitrate access.
5. A malfunctioning RDU tool.
Bendix ® ACom ® Diagnostics Software
Bendix ® ACom ® Diagnostics is a PC‑based software
program and is designed to meet RP‑1210 industry
standards. This software provides the technician with
access to all the available ECU diagnostic information and
configuration capability, including:
• ECU information
• Diagnostic trouble codes and repair information
• Configuration (ABS, ATC, and more)
• Wheel speed information
• Perform component tests
•
Save and print information
When using ACom ® Diagnostics software to diagnose
the Bendix ® EC‑80 ™ ABS ECU, the computer’s serial,
parallel or USB port needs to be connected to the vehicle’s
diagnostic connector.
For more information on ACom Diagnostics software or
RP1210 compliant tools, go to www.bendix.com or visit
your local authorized Bendix parts outlet.
See pages 40-43 for Appendix: J1939 SPN and FMI codes
and their Bendix blink code equivalents.
www.bendix.com
For the latest information, and for free downloads of the
Bendix ACom Diagnostics software, and its User Guide,
visit the Bendix website at www.bendix.com.
Bendix Technical Assistance Team
For direct telephone technical support, call the Bendix
technical assistance team at:
1-800-AIR-BRAKE (1‑800‑247‑2725, option 2,1), Monday
through Friday, 8:00 A.M. to 6:00 P.M. ET, and follow the
instructions in the recorded message. Or, you may send
an e‑mail to [email protected] to reach the Bendix
technical assistance team.
FIGURE 10 - DIAGNOSTIC TROUBLE CODES
LED Diagnostic Trouble Codes
LFT ‑ Left
RHT ‑ Right
DRV ‑ Drive Axle
ADD ‑ Additional
STR ‑ Steer Axle
VLT ‑ Power
ECU ‑ ABS Controller
SEN ‑ Wheel Speed
Sensor
MOD ‑ Pressure Modulator
Valve
TRC ‑ Traction Control
Example: If the Diagnostic
Trouble Code is “Right
Steer Axle Sensor”, the
RDU ™ unit will display one
green and three red LEDs
LEDs
Green
VLT
Red
SEN
STR
RHT
FIGURE 11 - BENDIX ® ACOM ® DIAGNOSTICS