BENDIX SD-13-4863 Manuel D’Utilisation

The ECU operates at a nominal supply voltage of 12 or 
24 volts, depending on the ECU.  The battery input is 
connected through a 30 amp fuse directly to the battery.

The ignition input is applied by the ignition switch through 
a 5 amp fuse.

The EC-60

™

 controller supports one ground input.  See 

pages 35 to 40 for system schematics.

EC-60

™

 cab ECUs require a second ground input (X1-12) 

for the ABS indicator lamp. The X1 wire harness connector 
contains an ABS indicator lamp interlock (X1-15), which 
shorts the ABS indicator lamp circuit (X1-18) to ground if 
the connector is removed from the ECU.

Wheel speed data is provided to the EC-60

™

 controller from 

the WS-24

™

 wheel speed sensor (see Figure 2).  Vehicles 

have an exciter ring (or “tone ring”) as part of the wheel 
assembly, and as the wheel turns, the teeth of the exciter 
ring pass the wheel speed sensor, generating an AC signal.  
The EC-60

™

 controller receives the  AC signal, which varies 

in voltage and frequency as the wheel speed changes.

Vehicle axle configurations and ATC features determine 
the number of WS-24

™

 wheel speed sensors that must 

be used.  A vehicle with a single rear axle requires four 
wheel speed sensors.  Vehicles with two rear axles can 
utilize six wheel speed sensors for optimal ABS and ATC 
performance.

A momentary switch that grounds the ABS Indicator Lamp 
output is used to place the ECU into the diagnostic blink 
code mode and is typically located on the vehicle’s dash 
panel.

Standard EC-60

™

 controllers support four sensor/four 

modulator (4S/4M) applications.  Certain models support 
Power Line Carrier (PLC) communications, with all models 
supporting 12 volt installations.  See Chart 1 for more 
details.

Premium EC-60

™

 controllers support applications up to six 

sensor/six modulator (6S/6M) installations with ATC and 
drag torque control.  All 12 volt models support PLC.  24 volt 
models do not support PLC. See Chart 1 for more details.

Since March 1, 2001, all towing vehicles must have an 
in-cab trailer ABS Indicator Lamp.  Trailers transmit the 
status of the trailer ABS over the power line (the blue wire 
of the J560 connector) to the tractor using a Power Line 
Carrier (PLC) signal.  See Figures 4 and 5.  Typically the 
signal is broadcast by the trailer ABS ECU.  The application 
of PLC technology for the heavy vehicle industry is known 
as “PLC4Trucks.”  The Standard PLC EC-60

™

 controller 

and the Premium EC-60

™

 controller (12 volt versions) 

support PLC communications in accordance with SAE 
J2497.

Refer to the information panel on the ECU label to see if 
the controller provides PLC.

An oscilloscope can be used to measure or identify the 
presence of a PLC signal on the power line.  The PLC 
signal is an amplitude and frequency modulated signal.  
Depending on the filtering and load on the power line, the 
PLC signal amplitude can range from 5.0 mVp-p to 7.0 Vp-p.  
Suggested oscilloscope settings are AC coupling, 1 volt/
div, 100 µsec/div.  The signal should be measured at the 
ignition power input of the EC-60

™

 controller.

Note:  An ABS trailer equipped with PLC, or a PLC 
diagnostic tool, must be connected to the vehicle in order 
to generate a PLC signal on the power line.

Alternatively, the part number shown on the ECU label 
can be identified as a PLC or non-PLC ECU by calling the 
Bendix TechTeam at 1-800-AIR-BRAKE (1-800-247-2725).