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USING HAND-HELD OR PC-BASED

DIAGNOSTICS

Troubleshooting and Diagnostic Trouble Code (DTC)

clearing (as well as reconguration) 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 rst 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 rst, 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-conguration 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 (Bendix part number K101596N001)

provides the technician with a visual indication of Antilock

Braking System (ABS) component Diagnostic Trouble

Code (DTC) information. The RDU tool is specically

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-Con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.

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 ash 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)

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 43 44

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