Bendix Commercial Vehicle Systems EC-80 ABS ATC SD - Manual (Page 16)

16
USING HAND-HELD OR PC-BASED
DIAGNOSTICS
Troubleshooting and Diagnostic Trouble Code (DTC)
clearing (as well as reconfiguration) may also be carried out
using hand‑held or PC‑based diagnostic tools such as the
Bendix ® Remote Diagnostic Unit (RDU ™ ), Bendix ® ACom ®
Diagnostics software, or the ProLink ™ tool.
If the ABS ECU has no active DTCs, only the green LED
will remain illuminated.
If the ABS ECU has at least one active DTC the RDU
tool displays the first DTC by illuminating the red LEDs,
indicating the malfunctioning ABS component and its
location on the vehicle. (See Figure 10.) If there are
multiple DTCs on the ABS system, the RDU tool will display
one DTC first, then once that DTC has been repaired and
cleared, the next code will be displayed.
Typical Combination DTCs are:
• Right steer sensor
•
Left steer sensor
• Right drive sensor
• Left drive sensor
• Right additional sensor
• Left additional sensor
• Right steer modulator
• Left steer modulator
• Right drive modulator
•
Left drive modulator
• Right additional
modulator
• Left additional
modulator
• Traction modulator
• ECU
• Engine serial
communication
• MOD red LED illuminated, shows the “Common”
connection of one or more modulators is shorted to
battery or ground
• VLT (Flashing indicates either over‑ or under‑voltage
condition)
To pinpoint the root cause and to ensure that the
system DTC has been properly corrected, additional
troubleshooting may be necessary.
Bendix
® RDU ™ Reset Function
The magnetic reset switch is located in the center top of
the RDU tool. Activation requires a magnet with 30 gauss
minimum.
The reset operations are:
1. If the magnet is held over the switch for less than six (6)
seconds the “clear Diagnostic Trouble Codes” command
is sent.
2. If the magnet is held over the switch for more than six (6)
seconds, but less than 30 seconds, the Bendix ABS
“self-configuration command” is sent.
Additionally, it is recommended at the end of any inspection
that the user switches off and restores the power to the
ABS ECU, then check the ABS indicator lamp operation
and RDU ™ tool to see if they indicate any remaining DTCs.
Troubleshooting: Using Hand-Held or
PC-Based Diagnostic Tools
Bendix ® RDU ™ (Remote Diagnostic Unit)
The Bendix ® RDU ™ tool provides the technician with
a visual indication of Antilock Braking System (ABS)
component Diagnostic Trouble Code (DTC) information.
The RDU tool is specifically designed for use with Bendix ®
ABS systems and Bendix makes no claims for its operation
and/or usability with other brands of ABS systems.
Features of the Bendix
® RDU ™ Tool
The RDU tool attaches to the 9 pin diagnostic connector
in the cab of the vehicle. An adapter cable (Bendix part
number 5012793) is available to connect the RDU to
vehicles with a 6‑pin diagnostic connector. (See Figure 9.)
The RDU tool allows the technician to:
• Troubleshoot ABS system component problems using
DTC reporting via LEDs.
• Reset DTCs on Bendix ABS ECUs by holding a magnet
over the reset in the center of the RDU tool for less than
6 seconds.
• Enter the Self-Configuration Mode used by Bendix ABS
ECUs by holding a magnet over the reset area for greater
than 6 seconds but less than 30 seconds.
How the Bendix RDU Operates
See Figure 7 for typical vehicle connector locations.
When the RDU tool is plugged into the diagnostic
connector, all the LEDs will illuminate, and the green LED
will flash four (4) times to indicate communications have
been established.
FIGURE 9 - THE BENDIX ® REMOTE DIAGNOSTIC
UNIT (RDU)
LED lights
illuminate
Diagnostic
Trouble
Codes
(10 locations
in total)