Troubleshooting: Using
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
LED lights illuminate Diagnostic Trouble Codes
(10 locations
in total)
FIGURE 11 - THE BENDIX® REMOTE DIAGNOSTIC UNIT
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
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
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.
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 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
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
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.
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