BENDIX BW2786 Fiche De Données

Advanced

The color coding of the brake system schematic follows TMC Recommended Practice 

#423.

Air disc & drum brake actuation combined on a single axle are shown for pictorial 

purposes only.

The EC-60

™

 controller contains self-testing diagnostic circuitry that continuously checks for the 

normal operation of internal components and circuitry, as well as external ABS components 
and wiring.

When an erroneous system condition is detected, the EC-60

™

 controller:

1.  Illuminates the appropriate indicator lamp(s) and disengages part or all of the ABS, ATC 

and ESP functions.  (See Service Data Sheet.)

2.  Places the appropriate trouble code information in the ECU memory. 

3.  Communicates the appropriate trouble code information over the serial communications 

diagnostic link as required.  Hand-held or PC-based diagnostic tools attach to the vehicle 
diagnostic connector, typically located on or under the dash.

When using our PC-based Bendix

®

 ACom

™

 Software, follow the on-screen troubleshooting 

steps to correct any DTCs.  A hand-held tool such as the Bendix Remote Diagnostic Unit (RDU) 
provides direct access to the DTCs without the need to use blink codes.

Blink codes allow a technician to troubleshoot ABS problems in situations where a hand-held 
or PC-based diagnostic tool is not available.  Instead, information about the ABS system is 
communicated by the ECU, using the ABS indicator lamp to display sequences of blinks.

Note:  The ECU will not enter the diagnostic blink code mode if the wheel speed sensors show 
that the vehicle is in motion.  If the ECU is in the diagnostic blink code mode and then detects 
vehicle motion, it will exit the blink code mode.

In addition, by operating the blink code switch as described below, one of several diagnostic 
modes can be entered. See Diagnostic Modes section below. 

When activating the blink code switch:

1.  Wait at least two seconds after “ignition on.” (Except when entering Reconfi guration Mode 

- see Service Data sheet.)

2.  For the ECU to recognize that the switch is activated “on,” the technician must press for at 

least 0.1 seconds, but less than 5 seconds.  (If the switch is held for more than 5 seconds, 
the ECU will register a malfunctioning switch.)

3.  Pauses between pressing the switch when a sequence is required, (e.g. when changing 

mode) must not be longer than 2 seconds.

4.  After a pause of 3.5 seconds, the ECU will begin responding with output information blinks.  

The information presented here is condensed from the troubleshooting section of the Bendix

®

 EC-60

™

 Advanced ABS Controller Service Data Sheet, SD-13-4869 available for download on www.bendix.com.  Whenever possible, use a PC-based diagnostic tool, such as the Bendix

®

ACom

™

 Software (free download from www.bendix.com) or hand-held Bendix

®

 Remote Diagnostic Unit (RDU).  The Bendix

®

 ACom

™

 Software uses on-screen troubleshooting steps to help correct any DTCs.  The Bendix

®

 ACom

™

 Software (BW2329) may also be ordered on CD from the 

Literature Center at www.bendix.com.

The ECU responds with a sequence of blink codes. The overall blink code response from the 
ECU is called a “message.”  Each message includes, depending on the mode selected by the 
technician, a sequence of one or more groups of blinks.  Simply record the number of blinks for 
each sequence and then use the brief troubleshooting index shown here, or full troubleshooting 
information in the Service Data sheet, for active or inactive trouble codes. 

NOTE:

1.  Sequences of blinks illuminate the ABS indicator lamp for half a second, with half-second 

pauses between them.

2.  Pauses between blink code digits are 1.5 seconds.

3.  Pauses between blink code messages are 2.5 seconds.

4.  The lamp remains on for 5 seconds at the end of the messages.

Once the ABS indicator lamp begins displaying a sequence of codes, it continues until all blink 
code messages have been displayed and then returns to the normal operating mode.  During 
this time, the ECU will ignore any additional blink code switch activation.

All trouble codes, with the exception of voltage and J1939 trouble codes, will remain in an active 
state for the remainder of the power cycle.

Voltage trouble codes will clear automatically when the voltage returns within the required limits.  
All ABS functions will be re-engaged.

J1939 trouble codes will clear automatically when communications are re-established.

www.foundationbrakes.com

C

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Advanced

BW2786  ©  2009 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group • All Rights Reserved • 08/09 • Printed in U.S.A.