15
USING HAND-HELD OR PC-BASED
DIAGNOSTICS
Troubleshooting and diagnostic trouble code 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 Diagnostic Trouble Codes,
only the green LED will remain illuminated.
If the ABS ECU has at least one active Diagnostic Trouble
Code the RDU
™
tool displays the first diagnostic trouble
code by illuminating the red LEDs, indicating the
malfunctioning ABS component and its location on the
vehicle. (See Figure 11.) If there are multiple diagnostic
trouble codes on the ABS system, the RDU
™
tool will display
one diagnostic trouble code first, then once that Diagnostic
Trouble Code has been repaired and cleared, the next code
will be displayed.
Typical Combination Diagnostic Trouble Codes 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
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 11.)
The RDU
™
tool 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 center of 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 9 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 4 times to indicate communications have been
established.
• 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 the system
diagnostic trouble code is properly corrected the first time,
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 6
seconds the "clear diagnostic trouble codes" command
is sent.
2. If the magnet is held over the switch for more than 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
Diagnostic Trouble Codes.
FIGURE 11 - THE BENDIX
®
REMOTE DIAGNOSTIC
UNIT
LED lights
illuminate
Diagnostic
Trouble
Codes
(10 locations
in total)
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