Bendix Commercial Vehicle Systems EC-60 ATC STD/PREM CONTROLLERS - Manual (Page 4)

4
ABS OFF-ROAD SWITCH AND INDICATOR
LAMP OPERATION
WARNING: The ABS off-road mode should not be
used on normal, paved road surfaces because vehicle
stability and steerability may be affected. When the ECU is
placed in the ABS off-road mode, the ABS Indicator Lamp
will flash constantly to notify the vehicle operator that the
off-road mode is active.
Premium EC-60
™ controllers use a dash-mounted switch
to place the ECU into the ABS off-road mode. In some
cases, ECUs may also be put into the ABS off-road mode
by one of the other vehicle control modules, using a J1939
message to the EC-60 ™ controller.
(If you need to know if your EC-60 ™ controller uses a J1939
message to operate the lamp, e-mail [email protected],
specifying the ECU part number, or call 1-800-AIR-BRAKE
and speak to the Bendix TechTeam.)
Stop Lamp Switch (SLS)
The Premium EC-60 ™ controller monitors the vehicle stop
lamp status. Certain vehicle functions, such as ATC and
All-Wheel Drive (AWD), use the status of the stop lamp to
know the driver’s intention. This can be provided to the ECU
via J1939 communications, or hardware input.
EC-60 ™ CONTROLLER OUTPUTS
Bendix ® M-32 ™ and M-32QR ™ Pressure
Modulator Valves (PMV)
The Bendix ® M-32 ™ and M-32QR ™ pressure modulator
valves (PMV) are operated by the EC-60 ™ controller to
modify driver applied air pressure to the service brakes
during ABS or ATC activation (See pages 6-8). The PMV
is an electro-pneumatic control valve and is the last valve
that air passes through on its way to the brake chamber.
The modulator hold and release solenoids are activated
to precisely modify the brake pressure during an antilock
braking event. The hold solenoid is normally open and the
release solenoid is normally closed.
Traction Control Valve (TCV)
Premium EC-60 ™ controllers will activate the TCV during
differential braking ATC events. The TCV may be a
separate valve or integrated into the rear axle relay valve.
ABS Indicator Lamp Control with Optional
Diagnostic Blink Code Switch (Cab and Frame
ECUs)
Cab and frame-mount EC-60 ™ controllers have internal
circuitry to control the ABS Indicator Lamp on the dash
panel.
The ABS Lamp Illuminates:
1. During power up (e.g. when the vehicle is started) and
turns off after the self test is completed, providing no
Diagnostic Trouble Codes (DTCs) are present on the
tractor.
2. If the ECU is unplugged or has no power.
3. When the ECU is placed into the ABS off-road mode
(the lamp flashes rapidly).
4. To display blink codes for diagnostic purposes after the
external diagnostic switch is activated.
Certain models of the EC-60 ™ controller communicate with
other vehicle control modules to operate the ABS Indicator
Lamp using serial communications. (If you need to know
if your EC-60 ™ controller uses serial communications to
operate the lamp, e-mail [email protected], specifying the
ECU part number, or call 1-800-AIR-BRAKE and speak to
the Bendix TechTeam.)
Indicator Lamp Control Using Serial
Communications Links
As mentioned above, depending on the vehicle
manufacturer, the dash indicator lamps (ABS, ATC, and
trailer ABS) may be controlled using serial communications
links. In these cases, the EC-60 ™ controller will send a
serial communications message over the J1939 or J1587
links indicating the required status of the lamp(s). Another
vehicle control module receives the message and controls
the indicator lamp(s).
Retarder Relay Disable Output
The retarder relay disable output may be used to control
a retarder disable relay.
When configured to use this output, the ECU will energize
the retarder disable relay and inhibit the use of the retarder
as needed.
SAE J1939 Serial Communications
A Controller Area Network (CAN) data link (SAE J1939) is
provided for communication. This link is used for various
functions, such as:
• To disable retarding devices during ABS operation
• To request that the torque converter disable lock-up
during ABS operation
• To share information such as wheel speed and ECU
status with other vehicle control modules
Premium EC-60 ™ controllers utilize the J1939 data link for
ATC and drag torque control functions.
Trailer ABS Indicator Lamp Control
Certain models of the EC-60 ™ controller activate a trailer
ABS Indicator Lamp (located on the dash panel) that
indicates the status of the trailer ABS unit on one, or
more trailers, or dollies. Typically, the EC-60 ™ controller
directly controls the trailer ABS Indicator Lamp based on
the information it receives from the trailer ABS.