Bendix Commercial Vehicle Systems EC-30 User Manual
Bendix® EC-30™ ABS / ATC Controller
Mounting
SD-13-4815
Inserts
18-pin
Connector
Part Number
Label
30-pin
Connector
FIGURE 1 - EC-30™ CONTROLLER
INTRODUCTION
The Bendix® EC-30™ is an electronic ABS (antilock braking
system) controller. It is the base component in a family of
ABS assemblies for heavy and medium duty buses, trucks
and tractors utilizing pneumatic braking systems.
The ABS function of the EC-30™ controller is designed to
optimize slip on all vehicle wheels. The EC-30™ controller
provides the vehicle with improved stability and steerability
during braking. The EC-30™ controller will also reduce
vehicle stopping distance on most surfaces.
In addition to the ABS function, the EC-30
be confi gured to provide an A TC (automatic traction control)
feature. Bendix ATC can improve vehicle traction during
acceleration on adverse road conditions. ATC can utilize
engine torque limiting and/or differential braking to improve
vehicle traction.
™
controller can
LED Diagnostic
Display
TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . PAGE
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
EC-30
EC-30
EC-30
EC-30
Power-Up Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ABS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ATC Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Auto-Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
EC-30
EC-30
Fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
ABS Partial Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
EC-30
Blink Code Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . 10
Bendix DCI Diagnostic Tool . . . . . . . . . . . . . . . . . . . . . . 14
Bendix ABS Diagnostic Software . . . . . . . . . . . . . . . . . . 15
NEXIQ (MPSI) Bendix Cartridge. . . . . . . . . . . . . . . . . . . 15
Contacting Bendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Safe Maintenance Practices. . . . . . . . . . . . . . . . . . . . . . 15
Removing the EC-30
Installing a New EC-30
ABS and ATC Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
™
Controller Hardware Confi gurations . . . . . . . . . . 3
™
Controller With PLC. . . . . . . . . . . . . . . . . . . . . . . 3
™
Controller Inputs . . . . . . . . . . . . . . . . . . . . . . . . . 4
™
Controller Outputs . . . . . . . . . . . . . . . . . . . . . . . . 4
™
Controller Confi gurable Parameters . . . . . . . . . . 8
™
Controller Self-Confi guration. . . . . . . . . . . . . . . . 8
™
Controller Diagnostic Display . . . . . . . . . . . . . . . 9
™
Controller Assembly . . . . . . . . . 16
™
Controller. . . . . . . . . . . . . . . . . 16
1
ABS / ATC
Assembly
EC-30
Controller
A TC
Modulator
(integral)
ATC
Modulator
Connector
ATR VALVE
FIGURE 2 - EC-30™ CONTROLLER WITH ATR VALVE
™
EC-30™ Controller Comparison to EC-16™ and
EC-17
™
Controllers
The EC-30™ controller has been designed to replace the
EC-17™ and the EC-16™ controllers as the standard Bendix
ABS controller for OEM and aftermarket installations. The
™
EC-30
controller has a black plastic enclosure similar to
the EC-17™ controller. However, the EC-30™ controller
utilizes plastic mounting inserts to reduce mounting bolt
corrosion, where the EC-17™ controller utilizes metal
mounting inserts. The EC-16™ controller utilizes a totally
metal enclosure.
The EC-30™ controller ABS warning lamp power-up
sequence has been simplifi ed compared to the EC-17™
and EC-16™ controllers.
The EC-30™ controller ABS warning lamp, at power-up without
faults, will illuminate for 2.5 seconds and then turn off.
The ABS warning lamp for EC-17
™
and EC-16™ controllers,
at power-up without faults, will illuminate for approximately
8 seconds and fl ash twice before turning off.
COMPONENTS
The EC-30™ controller ABS function utilizes the following
components:
- Wheel speed sensors (4 or 6, depending on
confi guration)
- Electro-pneumatic ABS modulator valves (4)
- Dash mounted tractor ABS warning lamp (relay
controlled)
- Service brake relay valve
- Dash mounted trailer ABS warning lamp (towing
vehicles manufactured after March 1, 2001)
- Blink code activation switch (optional)
The EC-30™ controller ATC function utilizes the following
additional components:
- ATC modulator - Integral to the ATR (antilock/traction
relay) valve assembly
- Dash mounted ATC active/warning lamp
- Serial communication to engine control module
(interfaces with throttle input and engine torque)
- ATC enable/disable switch
ENCLOSURE
The EC-30™ controller electronics are contained in a nonmetallic housing and are environmentally protected by a
hard epoxy potting compound. The design of the EC-30
controller electronics is robust against radio, electromagnetic and environmental interference.
A patented LED (light emitting diode) diagnostic display
and magnetic reset switch are incorporated in the housing
for simple, self-contained diagnostics.
The EC-30™ controller utilizes a 30-pin and an 18-pin wire
harness to interface with ABS, ATC and vehicle system
components.
2
™
ECU Enclosure ABS Warning Lamp
Model Power-Up Sequence
EC-30
Controller Mounting Inserts
EC-17
Controller Mounting Inserts fl ashes, then off
EC-16
Controller fl ashes, then off
CHART 1 - ECU DIFFERENCES (EC-30™, EC-17™, EC-16
CONTROLLERS)
™
Plastic with Plastic 2.5 seconds on, then off
™
Plastic with Metal 8 seconds on, two
™
Metal Enclosure 8 seconds on, two
MOUNTING
ECU Only
The EC-30™ controller can be bracket mounted to the vehicle
cab or chassis as a stand alone ECU. See fi gure 1.
Valve Mounted EC-30™ Controller
The EC-30™ controller can be assembled on one of four
different valve models. The controller valve assembly is
then mounted in place of the standard service brake relay
valve on the vehicle. An assembly model designation
is assigned when the EC-30™ controller is mounted on
an AR (antilock relay) valve or an ATR (antilock/traction
relay) valve. See fi gure 2. Some models include bobtail
proportioning and/or ATC functions. See chart 2.
EC-30™
Controller/Valve Added
Assembly ABS / ATR Function Vehicle
Models Valve Provided Application
CR-30 AR-1™ Valve None All
CR-30BP AR-2
Proportioning Only
AT-30 ATR-1
AT-30BP ATR-2
Brake Proportioning Only
CHART 2 - EC-30™ CONTROLLER / VALVE ASSEMBLIES
™
Valve Bobtail Brake Tractors
™
Valve ATC All
™
Valve ATC & Bobtail Tractors
™
EC-30™ CONTROLLER HARDWARE
CONFIGURATIONS
The EC-30™ controller ABS ECU is available in different
hardware confi gurations in order to support various ABS,
ATC and power line carrier (PLC) features. See chart 3.
™
EC-30
controller premium PLC hardware can be
confi gured for four or six sensors, with or without A TC, and
PLC can be disabled.
EC-30™ controller basic models can not be confi gured for
six sensors or ATC.
PLC hardware is needed to support PLC communication.
Always verify that you are working with the correct EC-30™
controller by referring to the part number label on the ECU.
EC-30™ CONTROLLER WITH PLC
Effective March 1, 2001, all towing vehicles must control
an in-cab trailer ABS warning lamp. Trailers built after this
date will transmit the status of the trailer ABS unit over the
power line (blue wire of the J560 connector) to the tractor
using PLC communications.
The PLC signal is usually broadcasted by the trailer ABS
ECU. The application of PLC technology for the heavy vehicle
industry is known as PLC4Trucks. The Bendix® EC-30™
controller premium with PLC, and basic with PLC, will support
PLC communication in accordance with SAE J2497.
Measuring / Identifying the PLC Signal
An oscilloscope can be used to verify the presence of a PLC
signal on the power line. The PLC signal is an amplitude
and frequency modulated signal. Depending on the fi ltering
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 power leads of the
™
EC-30
The EC-30™ controller will not broadcast PLC messages
unless it is specially programmed to do so. With this
standard confi guration, an ABS trailer equipped with PLC or
a PLC diagnostic tool will need to be attached to the vehicle
in order to generate a PLC signal on the power line.
controller. See fi gures 3 & 4.
Identifying an EC-30™ Controller with PLC
FIGURE 3 - POWER LINE WITHOUT PLC SIGNAL
An EC-30™ controller with or without PLC can be identifi ed
by the individual part number label on the ECU. Also, an
EC-30™ controller may have one of the following labels
applied:
White Label:
ECU does not support an in-cab
Trailer ABS warning lamp.
Orange Label:
ECU supports IN-CAB
FIGURE 4 - POWER LINE WITH PLC SIGNAL
Trailer ABS warning lamp.
Diagnostics
Engine
Communication
EC-30 Hardware Sensors ATC J1587 J1939 Blink J1922 J1939 PLC Trailer
Confi gurations Codes ABS WL
1
Basic 4 X X X X
Premium 4, 6 X X X X X
Basic PLC 4 X X X X X X
Premium PLC 4, 6 X X X X X X X
EC-17/EC-16 Service 4, 6 X X X X X X
Replacement
1
Required for all towing vehicles built after March 1, 2001.
CHART 3 - EC-30™ CONTROLLER HARDWARE CONFIGURATIONS
3
EC-30™ CONTROLLER INPUTS
Power and Ground
Power is supplied to the EC-30™ controller from the ignition
circuit through a 30 Amp fuse. The EC-30™ controller is
grounded to the vehicle chassis. For EC-30
power and ground connector pin locations, see EC-30™
controller system schematic, Figure 14.
Wheel Speed Sensors
Wheel speed data is provided to the EC-30™ controller from
the Bendix® WS-20™ or WS-24™ wheel speed sensors.
See fi gure 5 for wheel speed sensor illustrations. Working
with an exciter ring, wheel speed sensors provide the
EC-30™ controller with an AC signal, which varies in voltage
and frequency in relation to the speed of the wheel. The
EC-30™ controller can be confi gured to receive wheel
speed information from 100 or 86 tooth exciter rings.
Vehicle axle confi gurations and ATC features determine
the number of speed sensors that must be used. A vehicle
with a single rear drive axle (4x2, 4x4 or 6x2) requires four
speed sensors for both ABS and ATC operation. A vehicle
with two rear drive axles (6x4) can utilize six speed sensors
for optimal ABS and ATC performance. For wheel speed
sensor connector pin locations, see the EC-30™ controller
system schematic, Figure 14.
™
controller
Blink Code Switch
The EC-30™ controller can be confi gured to support an
optional diagnostic blink code switch to ground, which can
be used to activate several functions available through
blink code diagnostics. Pin F3, of the 30-pin connector, is
the blink code switch input.
Three Position Switch for ATC and Blink Codes
The EC-30™ controller can be confi gured to receive both
the A TC enable/disable signal and the blink code activation
signal from a single three-position switch. In this case, the
common position of the switch is connected to pin F2 of
the 30-pin connector. The normally-open switch position
is connected to +12 VDC to disable ATC. The normallyopen (momentary) switch position is connected to ground
to activate blink codes. When confi gured in this manner,
there is no wire installed in pin F3 of the 30-pin connector,
which is normally used for the blink code switch input.
Brake Switch Input
The EC-30™ controller can be confi gured to support an
optional brake switch input. The brake switch input can be
used in accordance with ABS and ATC performance. Pin
A2, of the 18-pin connector, is the brake switch input.
WS-24™
Sensor
™
WS-20
Sensor
90° Speed
Sensors
WS-24™
Sensor
FIGURE 5 - BENDIX® WS-20™ AND WS-24™ WHEEL SPEED
SENSORS
Straight Speed
Sensors
WS-20™
Sensor
ATC Enable/Disable Switch
Premium EC-30™ controller models, confi gured for A TC,
monitor an ATC enable/disable switch to +12 VDC, which
allows ATC to be manually deactivated. The ATC active/
warning lamp will be on while the ATC is disabled. Pin F2,
of the 30-pin connector is the ATC enable/disable switch
input.
J1939 - ATC Enable/Disable Switch
The EC-30™ controller can be confi gured to receive the
status of the A TC enable/disable switch over the SAE J1939
serial communications link. A vehicle controller will monitor
the position of the ATC enable/disable switch directly, and
broadcast a J1939 message indicating its status. When
confi gured in this manner, there will be no wire installed in
pin F2 of the 30-pin ECU connector. In the event that J1939
communications is lost between the EC-30™ controller and
the vehicle controller, the EC-30™ controller will disable the
ATC function.
4
EC-30™ CONTROLLER OUTPUTS
ABS Modulators
Bendix® ABS modulators (M-21™, M-22™, M-30™ or
M-32™) are controlled by the EC-30™ controller to modify
driver applied air pressure to the service brakes during
ABS or ATC activation. See fi gure 6 for illustration. The
ABS modulator, an electro-pneumatic control valve, is the
last valve that air passes through on its way to the brake
chamber. The modulator hold and exhaust solenoids are
activated to precisely modify the brake pressure during
ABS. The hold solenoid is normally open and the exhaust
solenoid is normally closed. The EC-30™ controller is
able to control four individual modulator assemblies. For
ABS modulator connector pin locations see the EC-30™
controller system schematic, fi gure 13.
™
M-30
Supply
(Port 1)
Electrical
Connector
FIGURE 6 - M-30™, M-32™, AND M-32QR™ MODULATORS
Modulator
M-32QR
Modulator
Delivery
(Port 2)
Exhaust
(Port 3)
™
™
M-32
Modulator
ATC Modulator
Premium EC-30™ controller models configured for
differential braking ATC will activate the ATC modulator
during A TC situations. The A TC modulator is an electrically
controlled air valve integral to the ATR valve. Pins D2 and
D3, of the 18-pin connector, control the ATC modulator. A
connection to the ATC modulator is provided via a two-pin
Deutsch connector from the ATR valve. See fi gure 2.
Trailer ABS Warning Lamp
EC-30™ controller models with PLC can be confi gured to
control a trailer ABS warning lamp (located in the dash) that
indicates the status of the trailer ABS unit of one or more
trailers or dollies. The EC-30™ controller directly controls
the trailer ABS warning lamp by providing a ground path
when the lamp is to be activated. Pin E2, of the 30-pin
connector, is the trailer ABS warning lamp output.
ABS Warning Lamp
The EC-30™ controller controls an ABS warning lamp
to indicate the ABS unit status. The EC-30™ controller
provides a ground signal to activate an ABS warning lamp
relay and turn the ABS lamp off. The actual ABS warning
lamp is connected to the normally-closed contacts of the
relay in order to illuminate in a fail-safe manner during an
ABS ECU failure. Pin E3, of the 30-pin connector, is the
ABS warning lamp output.
J1939 ABS Warning Lamp
The EC-30™ controller can be confi gured to broadcast the
ABS status over the SAE J1939 serial communications
link. A vehicle dash controller directly controls the ABS
warning lamp. When confi gured in this manner, there is no
wire installed in pin E3 of the 30-pin connector. If J1939
communications is lost between the EC-30™ controller and
the vehicle dash controller, the dash controller will activate
the ABS warning lamp.
Retarder Disable Relay
The EC-30™ controller controls an engine or transmission
retarder disable relay . The retarder activation wire is routed
through the normally-closed contacts of the relay. The
EC-30™ controller provides a ground path to activate
the relay and interrupt power to the retarder during ABS
operation. This output may also connect directly to a
transmission ECU. Pin K1, of the 30-pin connector, is the
retarder disable relay output.
J1939/J1922 Retarder Disable
The EC-30™ controller can be confi gured to interrupt the
engine or transmission retarder over the SAE J1939 serial
communications link. (J1922 for some service replacement
models). The retarder will be disabled during ABS via the
serial communications. When confi gured in this manner,
there is no wire installed in pin K1 of the 30-pin connector.
Use of the retarder disable function via the serial link may be
essential to ABS performance and is highly recommended
for vehicles equipped with a capable retarder.
J1939/J1922 Torque Converter Lock Disable
The EC-30™ controller can be confi gured to interrupt the
automatic transmission torque converter lock function,
over the SAE J1939 serial communications link. (J1922
for some service replacement models). The converter lock
will be disabled during ABS via the serial communications.
Use of the torque converter lock disable function may be
essential to ABS performance and is highly recommended
for vehicles equipped with a capable transmission.
J1939/J1587 Trailer ABS Warning Lamp
The EC-30™ controller can be confi gured to broadcast
the trailer ABS status over the SAE J1939 or the SAE
J1587 serial communications links. In this case, a vehicle
controller will directly operate the trailer ABS warning
lamp. When confi gured in this manner, there is no wire
installed in pin E2 of the 30-pin connector. In the event that
communications is lost between the EC-30™ controller and
the vehicle controller, the dash controller will activate the
trailer ABS warning lamp.
J1708/J1587 Diagnostic Link (J1939)
The EC-30™ controller provides a J1708/J1587 diagnostic
link to communicate with the vehicle and various diagnostic
tools. Diagnostics, system confi guration, data uploading
and downloading and other functions can be performed
using this link. The EC-30™ controller is supported by tools
such as Bendix® ABS Diagnostic Software, the Bendix®
DCI hand held tool and the MPSI ProLink. The EC-30™
controller may also provide diagnostics using the SAE
J1939 serial communications link.
J1939/1922 Engine Torque Reduction - ATC
The EC-30™ controller can be confi gured to reduce engine
torque over the SAE J1939 (J1922 for some service
replacement models) serial communications link. The
EC-30™ controller will send a J1939 message to reduce
engine torque during ATC operation.
A TC Active/W arning Lamp
Premium EC-30™ controller models confi gured for A TC can
control an A TC active/warning lamp to indicate the status of
the A TC system. The A TC active/warning lamp fl ashes when
A TC is active and stays on if an A TC system fault is detected
or ATC is disabled by the ATC enable/disable switch. The
EC-30™ controller directly controls the ATC active/warning
lamp by providing a ground path when the lamp is to be
activated. Pin C2, of the 30-pin connector, is the ATC
active/warning lamp output.
J1939 A TC Active/W arning Lamp
Premium EC-30™ controller models confi gured for A TC can
be confi gured to broadcast the status of the ATC active/
warning lamp over the SAE J1939 serial communications
link. In this case a vehicle dash controller directly operates
the ATC active/warning lamp. When confi gured in this
manner, there is no wire installed in pin C2 of the 30-pin
connector. In the event that J1939 communications are
lost between the EC-30™ controller and the vehicle dash
controller, the dash controller will activate the ATC active/
warning lamp.
5
POWER-UP SEQUENCE
ABS Warning Lamp at Power-Up
At power-up without detected faults, the ABS warning lamp
turns on for 2.5 seconds and then turns off. See fi gure 7.
ATC Active / Warning Lamp at Power-Up
At power-up, the ATC active/warning lamp displays the
ATC control confi guration and then turns off. A series of
blinks indicates if the ATC is confi gured for engine torque
limiting and differential braking, engine torque limiting only ,
or differential braking only. See fi gure 7.
Powered Vehicle ABS WL
Trailer ABS WL
(PLC Detected)
Trailer ABS WL
(PLC Not Detected)
ON
OFF
ON
OFF
ON
OFF
Diagnostic LEDs at Power-Up
At power-up, the diagnostic LEDs all turn on, then display
the confi guration for sensors and the ATC. After showing
the confi guration, only the green VLT LED will stay on.
However, if a fault is detected, the faulted component will
be identifi ed by the red LEDs. See chart 4.
LED Power-Up Sequence LEDs
st
1
Then the LEDs indicate one of the following:
nd
2
6 Sensors SEN-RER-MID-FRT
When power is applied All LEDs Illuminate
4 Sensors SEN-RER-FRT
Then the LEDs indicate one of the following:
ATC Engine Limiting TRC
rd
3
No ATC N/A
ATC Differential Braking TRC-MOD
The LEDs will then indicate system status:
4th Normal Operation (if no faults) VLT
CHART 4 - LED POWER-UP DISPLAY OF EC-30™
CONTROLLER CONFIGURATION
Retarder Disable Relay at Power-Up
At power-up, the EC-30™ controller may toggle the retarder
disable relay. If the relay is located in the cab it is usually
audible to the operator.
Engine torque
limiting and
differential braking
Engine torque
limiting only
Differential braking only
No A TC
FIGURE 7 - EC-30
SEQUENCE
™
CONTROLLER POWER-UP LAMP
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Trailer ABS Warning Lamp
At power-up, the trailer ABS warning lamp turns on for 2.5
seconds and then turns off. This only occurs if a PLC trailer
or PLC diagnostic tool is connected to the tractor at the
time ignition power is applied. Only an EC-30™ controller
with PLC installed on a towing vehicle will support the
trailer ABS lamp.
Modulator Chuff Test at Power-Up
At power-up, the EC-30™ controller activates a patented
modulator chuff test. The modulator chuff test is an
electrical and pneumatic ABS modulator test, that can
assist the technician in verifying proper modulator wiring
and installation. With brake pressure applied, a properly
installed modulator causes a single sharp audible chuff
of air pressure by activating the hold solenoid two times
and the exhaust solenoid once. If the modulator is wired
incorrectly, the modulator will produce a double chuff, or
no chuff at all. The EC-30™ controller activates a chuff at
each modulator in the following sequence:
Right-Front, Left-Front, Right-Rear, Left-Rear. See fi gure 8.
The chuff sequence is then repeated for a total of 8 chuffs. If
an issue is detected during the modulator chuff test, look for
faults and compare the modulator wiring and plumbing to the
EC-30™ controller system schematic shown in fi gure 13.
Right Front
Driver
Left Front
FIGURE 8 - VEHICLE ORIENTATION
Right Mid
Left Mid
Right Rear
Left Rear
6
ABS OPERATION
Bendix ABS uses wheel speed sensors, ABS modulators
and an ECU to control either four or six wheels. By
monitoring the wheel slip during braking, and adjusting
the brake pressure at each wheel, the EC-30™ controller
is able to optimize slip between the tire and the road
surface. When excessive wheel slip is detected, the
™
EC-30
controls the ABS modulators to simulate a driver pumping
the brakes. However, the EC-30™ controller is able to pump
each brake on the vehicle independently , and with greater
speed and accuracy than a driver.
Front Axle Control
Although both steering-axle wheels are controlled by
individual ABS modulators, the EC-30™ controller does
not control them completely independently. The EC-30™
controller uses a Modifi ed Individual Regulation (MIR)
philosophy which blends the applied braking force between
the two steering axle brakes. MIR is used to minimize
steering wheel pull while ABS is active on an uneven road
surface (e.g. ice and asphalt).
controller will activate ABS. The EC-30™ controller
During ATC activation, the EC-30
ATC active/warning lamp to advise the driver that drivewheel spin is occurring. When ATC is no longer active, the
ATC active/warning lamp turns off.
™
controller will blink the
Engine Torque Limiting ATC
The engine torque limiting feature allows the EC-30™
controller to reduce engine torque to a suitable level, in
relation to the amount of available traction. When the
engine torque is controlled, wheel slip can be optimized,
producing more traction between the wheel and road
surface. Engine torque limiting is especially benefi cial in
avoidance of a power jackknife and when all drive wheels
are on an equally slippery surface. The EC-30™ controller
will verify that the driver is pressing the accelerator (using
J1939 or J1922) prior to initiating an ATC event.
In order for the engine torque limiting ATC feature to be
used, the vehicle must be equipped with an electronically
controlled engine and throttle. When configured for
engine torque limiting ATC, the EC-30™ controller must be
connected to an electronic engine via the SAE J1939 or
J1922 serial communications links.
Single Rear Axle Control
On vehicles with a single rear axle (4x2), the rear axle
wheels are controlled independently. Therefore, brake
application pressure at each wheel is adjusted according
to the wheel behavior on the road surface.
Dual Rear Axle Control
For vehicles with dual rear axles (6x2 or 6x4), one ABS
modulator controls both right wheels and the other
modulator controls both left wheels. Both wheels on each
side receive equal brake pressure during an ABS stop. In
the case of only four wheel speed sensors, the two rear
sensors are located on the lighter rear axle.
Normal Braking
During normal braking, brake pressure is delivered through
the ABS modulator and into the brake actuator . If the wheel
speed sensors do not detect an excessive slip, the EC-30™
controller does not activate ABS control and the vehicle
stops with normal braking.
ATC OPERATION
Just as ABS improves vehicle stability during braking,
A TC improves vehicle stability and traction during vehicle
acceleration. By adding an ATC modulator and/or engine
communication, the EC-30™ controller ATC function uses
the same wheel speed information and modulator control
as the ABS function. The EC-30™ controller detects
excessive drive wheel speed, compares the speed of the
front, non-driven, wheels, and reacts to bring the wheel spin
under control. The EC-30™ controller can be confi gured
to use engine torque limiting and/or differential braking to
control wheel spin. For optimal ATC performance, both
methods are recommended.
Differential Braking ATC
Differential braking ATC allows the EC-30™ controller
to gradually apply the brake on a spinning drive wheel.
Since the vehicle’s differential tends to drive the wheel
that presents the least resistance (the wheel on the most
slippery surface), a slight brake application to this wheel
forces the differential to drive the wheel on the opposite
side. The EC-30™ controller applies brake pressure to both
rear-axle ABS modulators by energizing the A TC modulator .
The EC-30™ controller can then apply pressure only to the
spinning wheel by controlling the ABS modulators.
Differential braking A TC can be activated only when vehicle
speed is under 25 mph and one drive wheel is spinning
faster than the others.
In the event that differential braking, ATC is active for an
excessive time period, the EC-30™ controller will disable
ATC to prevent overheating and fading of brakes. The
EC-30™ controller will re-enable ATC after a short period
of time. The ATC active/warning lamp will be on while the
ATC is disabled.
In order for the differential braking control to be used, the
vehicle must be equipped with an antilock/traction relay
(A TR) valve (A TR-1 or ATR-2). The vehicle also must have
an electronically controlled engine throttle.
ATC Enable/Disable Switch
The ATC enable/disable switch allows the operator to
enable or disable the ATC feature as necessary. ATC can
be disabled while the vehicle is stationary or in motion.
However, ATC will not re-enable until the vehicle comes
to a complete stop, even with the switch in the enable
position. The A TC active/warning lamp will be on while the
ATC is disabled.
7
AUTO-CALIBRATION
Auto-calibration is a feature that allows the EC-30™
controller to compensate for tire size changes throughout
the life of the vehicle. Auto-calibration is needed for proper
ATC performance. The EC-30™ controller will perform an
auto-calibration when the tire size difference exceeds
approximately 4 percent.
Tire size (rolling radius) setting information can be retrieved
or adjusted by using Bendix ABS Diagnostics Software or
MPSI.
If issues occur with the ATC function following a tire size
change, contact Bendix or refer to your local authorized
Bendix dealer.
EC-30™ CONTROLLER CONFIGURABLE
PARAMETERS
The EC-30™ controller has various confi gurable function
parameters that can be enabled to provide the user with
additional or customized features. The default settings
for these parameters are chosen by the vehicle OEM.
The confi gurable features include serial communications
message broadcasts, alternative lamp control, various I/O
recognition, ABS control settings and others. To ensure
that the unit you are working with has the correct default
settings, use only the correct replacement part number.
However, most of these settings can be altered using the
Bendix ABS Diagnostic Software program. For further
information, contact Bendix or refer to your local authorized
Bendix dealer.
In order to self-confi gure for differential braking ATC, the
ATC modulator must also be connected to the EC-30
™
controller and be operational.
Some EC-30™ controller part numbers will not support six
wheel speed sensors or ATC. To ensure that the EC-30™
controller you are working with has the correct hardware
capability, use only the correct replacement part number.
EC-30™ Controller Self-Confi guration Procedure
Verify that all ECU, communication, sensor , ABS modulator
and ATC modulator connectors are in place and then turn
the ignition power on. Toggle the ATC enable/disable
switch, if equipped.
Activate an EC-30™ controller self-confi guration by one of
the following actions:
- Hold a magnet on the reset location of the diagnostic
display for about 20 seconds (until the LEDs begin to
rapidly roll), then remove the magnet.
- Press the DCI reset switch for about 20 seconds (until
the LEDs begin to rapidly roll), then release the switch.
- Use the self-confi guration menu selection on Bendix
ABS Diagnostic Software or the MPSI tool.
When the self-configuration process is complete, the
EC-30™ controller will automatically go through the powerup sequence and show the new confi guration on the
diagnostic display. If the EC-30™ controller was properly
confi gured for ATC, the ATC active/warning lamp will also
show the A TC confi guration. Refer to the EC-30™ controller
Power-Up Sequence section.
EC-30™ CONTROLLER SELF-CONFIGURATION
The self-confi guration feature allows wheel speed sensor
and A TC confi gurations to be altered when activated with
a magnet or diagnostic tool. This is generally performed
shortly after installing or replacing an EC-30™ controller.
Self-Confi guration of Wheel Speed Sensors
The number of speed sensors connected to the EC-30™
controller will be detected during the self-confi guration
process. The EC-30™ controller will configure for six
sensors if it detects one or both Mid sensors. If only one Mid
sensor is detected, the ABS warning lamp and appropriate
diagnostic LEDs will illuminate following the self-confi gure.
If no Mid sensors are detected, the EC-30™ controller will
confi gure for four sensors.
Self-Confi guration of ATC
In order to self-confi gure for engine torque limiting ATC,
the following must be connected to the EC-30™ controller
and be operational:
- J1939 or J1922 communication link to the engine
- ATC active/warning lamp
- ATC enable/disable switch (must be toggled prior to
self-confi guration)
FAULT DETECTION
The EC-30™ controller contains self-testing diagnostic
circuitry that continuously checks for proper operation of the
ABS/ATC components and wiring. The EC-30™ controller
controls dash mounted warning lamps to advise the driver
of the status of the system.
When the EC-30™ controller senses an erroneous system
condition, it stores the fault code in memory, activates the
appropriate warning lamp and disables all or part of the effected
ABS or A TC functions. The faulted component is also identifi ed
on the diagnostic display on the EC-30™ controller.
In most cases, the EC-30
(self-heal) the active fault code when the fault is corrected.
However, repeated occurrences of a given fault will cause the
fault code to latch. Once the fault code is latched, a manual reset
is required. Latching of faults can assist in the troubleshooting
of intermittent faults. The fault code is stored in the EC-30™
controller memory , even when power is removed.
After repair, latched fault codes can be reset by briefl y
holding a magnet on the reset location of the EC-30
controller diagnostic display . Fault codes can also be reset
with the blink code switch or with a diagnostic tool.
When a fault self-heals or is manually reset, the fault code
remains in fault history. Fault history can be retrieved by
using blink code diagnostics or a diagnostic tool.
™
controller will automatically reset
™
8
ABS PARTIAL SHUTDOWN
Depending which component the fault is detected on, the
ABS and ATC functions may be fully or partially disabled.
Even with the ABS warning lamp on, the EC-30™ controller
may still provide ABS function on wheels that are not
affected by the fault. The EC-30
serviced as soon as possible.
Front ABS Modulator Fault
ABS on the affected wheel is disabled. ABS and ATC on
all other wheels remains active.
Rear ABS Modulator Fault
ATC is disabled. ABS on the affected wheel is disabled.
ABS on all other wheels remains active.
Front Wheel Speed Sensor Fault
The faulted wheel is still controlled by using input from
the remaining wheel speed sensor on the front axle. ABS
remains active on the rear wheels. ATC is disabled.
Mid or Rear Wheel Speed Sensor Fault
ATC is disabled. In a four sensor system, ABS on the
affected wheel is disabled, but ABS on all other wheels
remains active.
In a six sensor system, ABS remains active by using input
from the remaining rear wheel speed sensor on the same
side.
ATC Modulator Fault
ATC is disabled. ABS remains active.
J1939/J1922 Communication Fault
ATC is disabled. ABS remains active.
™
controller should be
Reading a Fault
When a fault is detected, the EC-30™ controller identifi es
the faulted component with the diagnostic LEDs. When
a wheel speed sensor fault, or an ABS modulator fault is
detected, the SEN or MOD LED will be accompanied by two
location LEDs. An example is FR T-RHT -SEN. When these
three LEDs are on, this is an indication of a fault on the front
axle(FRT), right side(RHT), wheel speed sensor(SEN).
For a complete explanation and troubleshooting of faults
displayed by the LEDs, go to section F, Troubleshooting.
The red diagnostic LEDs only indicate active system faults.
When a fault self-heals or is manually reset, the fault code
remains in fault history. Fault history can be retrieved by
using blink code diagnostics or a diagnostic tool.
If faults occur on multiple components, the diagnostic
LEDs will display one fault at a time. When the fi rst fault is
repaired and the EC-30
will be displayed on the LEDs.
™
controller is reset, the next fault
Fault Reset
After the fault is corrected, the active fault code and LEDs
can be reset by briefl y holding a magnet in place at the
RESET location of the diagnostic display. All of the LEDs
will be on while the magnet is held in place. If one or more
LEDs do not go on when the magnet is in place, replace the
EC-30™ controller. When the magnet is removed from the
reset location, only the green VLT diagnostic LED should
remain on. If red LEDs are still on, active faults are still
present in the system.
Note: An EC-30™ controller self-confi guration will occur if
a magnet is held at the reset location for greater than 20
seconds.
ECU Fault
ABS and ATC are disabled. The system reverts to normal
braking.
Voltage Fault
While voltage is out of range, ABS and ATC are disabled.
The system reverts to normal braking. When the correct
voltage level is restored, full ABS and ATC function is
available. Operating voltage range is 9.0 to 16.0 VDC.
EC-30™ CONTROLLER DIAGNOSTIC DISPLAY
The EC-30™ controller diagnostic display consists of nine
red fault LEDs, one green power LED and an internal,
magnetic reset switch. See fi gure 9 for illustration.
No tools are needed to read the EC-30™ controller
diagnostic display . A fault displayed on the LEDs will always
be accompanied by the illumination of the ABS warning
lamp and/or the ATC active/warning lamp.
Front Axle
Mid Axle
Rear Axle
Right Side
Left Side
ATC
Modulator
Sensor
ECU
Voltage
FIGURE 9 - EC-30™ CONTROLLER LED DIAGNOSTIC
DISPLAY
Magnetic
Reset Switch
9
BLINK CODE DIAGNOSTICS
The EC-30™ controller provides diagnostic and confi guration
functions using blink code diagnostics. When the blink code
mode is activated, the EC-30™ controller fl ashes the ABS
warning lamp to communicate active fault codes, fault code
history or, ABS and ATC confi gurations. The blink code
diagnostics mode can also be used to reset active fault
codes. See chart 5.
The ABS warning lamp illuminates while the blink code
switch is pressed. The lamp turns off when the blink code
switch is released. The blink code switch is optional and
may not be installed on some vehicles (pin F3 of the 30pin connector).
Following a single display of all available messages, the
ABS warning lamp remains on for fi ve seconds and then
returns to the normal operating mode. Fault occurrence
count information is not displayed with blink code
diagnostics.
If wheel speeds are detected during the blink code
diagnostics mode, the EC-30
code diagnostics and returns to the normal operating mode.
The blink code diagnostics mode can only be activated
following a power-up, where wheel speeds have not been
detected.
Press the Blink Blink Code Action
Code Switch
1 time Display Active Fault Codes
2 times Display Fault Code History
3 times Reset Active Fault Codes
4 times Display EC-30 Confi guration
CHART 5 - BLINK CODE ACTIVATION
Display Active Fault Codes
To display active fault codes, press the blink code switch
one time. Following activation, there will be a three second
delay, followed by a blink code display of all active fault
codes. See chart 7 for fault code defi nitions.
™
controller exits the blink
Display Fault Code History
To display history fault codes, press the blink code switch
two times. Following activation, there will be a three second
delay, followed by a blink code display of all history fault
codes. See chart 7 for fault code defi nitions.
Reset Active Fault Codes
T o reset active fault codes, press the blink code switch three
times. Following activation, there will be a three second
delay, followed by a blink code message of:
1-1, (System Fully Operational - No Faults Detected)
or
A blink code display of all active fault codes.
The ABS warning lamp will stay on if active faults are still
present. See chart 7 for fault code defi nitions.
Resetting active fault codes with blink code diagnostics
does not clear information from the fault history. Fault
history can be retrieved by using blink code diagnostics
or a diagnostic tool.
Display EC-30™ Controller Confi guration
To check the ECU confi guration, press the blink code
switch four times. Following activation, there will be a
three second delay , followed by a blink code display of the
EC-30™ controller confi guration. See chart 6.
1st Digit Sensors
2 4 Sensors
3 6 Sensors
2nd Digit Modulators
2 4 Modulators
3rd Digit ATC
2 Not ATC
3 ATC Engine Torque Limiting Only
4 ATC Differential Brake Only
5 Full ATC (Engine Torque Limiting
and Differential Braking)
CHART 6 - BLINK CODES FOR EC-30
CONFIGURATION
™
CONTROLLER
10
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