BENDIX MC-30 TRAILER ABS CONTROLLER User manual

1
SD-13-4834
MC-30™CONTROLLER INTRODUCTION
TheMC-30™controlleristheBendixantilockbrakingsystem
(ABS) controller assembly intended for application on air
braked heavy duty trailers, semi-trailers and dollies.
The Bendix®MC-30™controller features an integral LED
diagnosticdisplay withmagnetic resetfor easydiagnostics
andfaultcode clearing.Blinkcode diagnosticsarestandard
and advanced diagnostic tool support is also available.
The MC-30™controller supports PLC communication
for indicator lamp, full diagnostics capability and other
customized features.
The ABS function of the MC-30™controller is designed to
providea towed vehiclewith improvedstability and control
during braking while providing the maximum available
braking force.
Bendix®MC-30™Trailer ABS Controller Assembly
FIGURE 1 - MC-30™CONTROLLER TANK (NIPPLE)
MOUNT ASSEMBLY
Supply Port
1/2" NPT
ABS Modulator
Connector
(MOD1)
Delivery Ports
3/8" NPT (x4)
LED Diagnostic
Display 30-Pin
Connector
Control
Port
1/4" NPT
For updates to this Service Data Sheet, please visit www.bendix.com.
TABLE OF CONTENTS PAGE
Components . . . . . . . . . . . . . . . . . . . . . . .2
MC-30™Controller Comparison to MC-12™Modulator. .2
MC-30™Controller Assemblies. . . . . . . . . . . . . .2
MC-30™Controller with PLC . . . . . . . . . . . . . . .2
Wiring Harness (Pigtail) . . . . . . . . . . . . . . . . .3
Power and Ground. . . . . . . . . . . . . . . . . . . .5
ABS Indicator Lamp . . . . . . . . . . . . . . . . . . .5
Wheel Speed Sensors . . . . . . . . . . . . . . . . . .5
M-30T™ABS Modulator-Valves . . . . . . . . . . . . .6
J1708/J1587 Diagnostic Link . . . . . . . . . . . . . .6
Auxiliary I/O . . . . . . . . . . . . . . . . . . . . . . .6
MC-30™Controller Power-up Sequence . . . . . . . . .7
ABS Operation . . . . . . . . . . . . . . . . . . . . . .7
Self-Configuration/Control Toggle . . . . . . . . . . . .8
Other Configurable Parameters . . . . . . . . . . . . 11
Odometer Function. . . . . . . . . . . . . . . . . . . 11
Fault Detection. . . . . . . . . . . . . . . . . . . . . 11
MC-30™Controller Diagnostic Display . . . . . . . . . 12
Blink Code Diagnostics . . . . . . . . . . . . . . . . 13
Bendix ABS Diagnostic Tools . . . . . . . . . . . . . 16
Contacting Bendix . . . . . . . . . . . . . . . . . . . 16
Correct Maintenance Practices . . . . . . . . . . . . 16
Servicing the MC-30™Controller. . . . . . . . . . . . 17
Replacing the EC-30T™Controller . . . . . . . . . . . 17
Overhaul of the Relay Valve . . . . . . . . . . . . . . 17
MC-12™Modulator / MCE-12 Service-Replacement. . 17
Reinstallation of the MC-30™Controller or
M-30T™Modulator-Valve. . . . . . . . . . . . . . . . 18
Leakage and Operational Tests . . . . . . . . . . . . 18
ABS Wiring. . . . . . . . . . . . . . . . . . . . . . . 18
Troubleshooting Flowcharts . . . . . . . . . . . . . . 24
Product Revision / Feature Introduction . . . . . . . . 32

2
MC-30™CONTROLLER COMPONENTS
The MC-30™controller ABS installation consists of the
following components:
- EC-30T™ABS Electronic Control Unit (ECU) (1)
- M-30T™ABS modulator-valve with relay function (1 or 2)
- WS-20™wheel speed sensors (2 or 4)
- Sensors spring clips (2 or 4)
- Trailer mounted ABS indicator lamp
- Pigtail wiring harness
- PLC signal for dash mounted trailer ABS indicator lamp
(Towed vehicles manufactured after March 1, 2001)
MC-30™CONTROLLER COMPARISON TO
MC-12™MODULATOR
The MC-30™controller has been designed to replace the
MC-12™modulator as the standard Bendix trailer ABS
controllerassembly forOEM and aftermarketinstallations.
The EC-30T™controller has a black plastic enclosure
similar to the Bendix®EC-30™tractor ABS controller, and
is mounted to the modulator-valve with a bracket. The
MC-12™modulator utilized a metal ECU enclosure and
was directly bolted to the modulator body. The MC-30™
controllerhasa 30-pinelectrical connectorandthe MC-12™
modulator has a 14-pin connector.
The M-30T™ABS modulator-valve utilizes a 3-pin external
electrical connector, where the MC-12™modulator used a
4-pin internal connector.
MC-30™CONTROLLER ASSEMBLIES
Tank (Nipple) Mounted
TheMC-30™controllertank-mount assemblyis mountedby
usinga schedule80(heavy gaugesteel)1/2" nippledirectly
between the trailer supply tank and the MC-30™modulator-
valvesupplyport. Atankwitha reinforcedportmustbeused.
See Figure 1 for tank-mount MC-30™modulator-valve.
CAUTION: The tank-mounted MC-30™modulator-valve
cannot be mounted on a frame or crossmember using the
ECU bracket holes.
Bracket (Chassis) Mounted
TheMC-30™controllerbracket mountassembly ismounted
directlyto thetrailer framerailor crossmember. See Figure
2 for bracket mount MC-30™controller. The bracket studs
are secured using three 5/16-18 nuts and lock washers
torqued to 180-220 in-lbs.
MC-30™CONTROLLER WITH PLC
Effective March 1, 2001 all towed vehicles must transmit a
signaltocontrolanin-cabtrailerABSindicatorlamp. Trailers
builtafterthisdatewilltransmitthestatusofthetrailerABSunit
overtheignitionpowerwire(blue wireoftheJ560connector)
using Power Line Carrier (PLC) communications.
ThePLCsignal isusuallybroadcast bythetrailerABSECU.
The application of PLC technology for the heavy vehicle
industry is known as PLC4Trucks. MC-30™controller
modelswithPLC willsupportcommunication inaccordance
with SAE J2497.
Identifying MC-30™Controller units with PLC
Most MC-30™controller units will contain PLC capability.
However, some MC-30™controller units installed prior to
March 1, 2001 may not. An MC-30™controller with PLC
canbe identifiedbythe individualpart numberlabeland pin
stamp on the EC-30T™controller housing. On PLC units,
the PLC function can be disabled with a diagnostic tool.
FIGURE 2 - MC-30™CONTROLLER BRACKET (FRAME)
MOUNT ASSEMBLY
Physical MC-30™MC-12™
Feature Controller Modulator
ECU Enclosure Plastic ECU Metal ECU
ECU Mounting Bracket Mounted to Directly Mounted to ABS
ABS Modulator Valve Modulator Valve Body
ECU Electrical 30-pin 14-pin
Connector
ABS Modulator 3-pin External 4-pin Internal
Connector Connector Connector
CHART 1 - MC-30™CONTROLLER AND MC-12™
MODULATOR DIFFERENCES
EC-30T™TRAILER ABS ECU
The EC-30T™is a plastic electronic controller with a
single 30-pin electrical connector. The EC-30T™controller
enclosure is filled with a hard epoxy-based potting that
seals all internal components from the environment. A
patented LED (light emitting diode) diagnostic display
and magnetic reset switch are incorporated in the housing
for simple, self-contained diagnostics. The design of the
EC-30T™controller’s electronics is robust against radio,
electromagnetic and environmental interference.
The EC-30T™controller is typically mounted to the
M-30T™modulator-valve using four bolts and a bracket.
This assembly forms an MC-30™ABS controller.
The EC-30T™controller can also be frame rail mounted,
independent of the M-30T™modulator-valve.

3
Thiswill bethecase whenan MC-30™controlleris installed
on a powered vehicle auxiliary axle.
Identifying / Measuring the PLC Signal
AnMC-30™controller withPLC willcontinuously broadcast
PLC messages that indicate trailerABS status. At power-
up or during a trailer ABS fault condition, the MC-30™
controller will signal the tractor ABS unit to illuminate the
dash mounted trailer ABS indicator lamp.
Diagnostic tools are available that detect the presence
of a PLC signal and perform further system diagnostics
directly on the power line. For more information on these
diagnostic tools, contact Bendix or refer to your local
authorized Bendix dealer.
An oscilloscope can also be used to verify the presence
and strength of a PLC signal on the power line. The PLC
signal is an amplitude and frequency modulated signal.
Depending on the load on the power line, the amplitude of
the PLC signal can range from 5.0 mV p-p to 7.0 V p-p.
Suggested oscilloscope settings are (AC coupling, 1 volt/
div, 100 µsec/div). The signal should be measured on
pin 7 of the J560 connector at the nose of the trailer. See
Figure3 and Figure4 forexamples of PLCmeasurements
using an oscilloscope.
Allconnector leadsofthe MC-30™controllerpigtail harness
are weather sealed at the connector interface and are
clearly labeled for proper installation.
Nonover-molded versionsof theMC-30™controller pigtail,
shown in Figure 5, are repairable. If repairs are needed,
see chart 12 for connector and tool information.
Over-molded versions of the wiring harness must be
replaced if corrosion or damage occurs.
ECU Connector
The 30-pin ECU connector of the pigtail is fastened to the
EC-30T™controller with a jackscrew tightened to 15-20
in. lbs. Improper tightening of the connector jackscrew
can cause environmental contamination or damage to the
EC-30T™controller. The useofainch-pound torquewrench
is recommended.
Power / ABS Indicator Lamp Connector
The MC-30™controller pigtail utilizes the TTMARP 97-99
5-pin Packard Weather Pack connector for brake light
power, constantpower,groundand thetrailermountedABS
indicator lamp. The Power/ABS Indicator Lamp lead of
the pigtail harness is available in various lengths to satisfy
installation requirements such as slider axles.
Wheel Speed Sensor Connectors
Two or four wheel speed sensor connectors are provided.
These2-pinconnectors arelabeledRight Front(RHTFRT),
LeftFront (LFTFRT),RightRear(RHTRER) andLeft Rear
(LFTRER). RightFront andLeftFront wheelspeed sensor
inputs must be used for two sensor installations, even if
the wheel speed sensors are not physically located on the
forward axle. Extension cables are available from Bendix
that will provide longer wheel speed sensor lengths when
required by the installation.
ABS Modulator Connectors
Oneortwomodulatorconnectorsareprovided. These3-pin
connectors are labeled MOD 1 and MOD 2. Modulator 1
is always used for single modulator installations. For two
modulator configurations, Modulator 1 is installed at the
right or front position. Modulator 2 is installed at the left
or rear position. An extension cable must be used for
Modulator 2. The remote modulator harness is available
in various lengths to satisfy any installation requirement.
See Figure 6.
Diagnostic Connector
An optional 4-pin diagnostic connector provides a port
for connecting a diagnostic tool. The connector provides
ignition power, ground and data lines. Remote diagnostic
cables are available from Bendix that will provide a
standard J1708/J1587 diagnostic port at the side of the
trailer. See Figure 7.
FIGURE 3 - POWER LINE WITHOUT PLC SIGNAL
FIGURE 4 - POWER LINE WITH PLC SIGNAL
MC-30™CONTROLLER WIRING HARNESS
(PIGTAIL)
The EC-30T™controller utilizes a pigtail wire harness to
interface with ABS and other trailer system components.
Various pigtail harness part numbers are available from
Bendix.Thefollowing connectorsare optionaland maynot
be present on all pigtail harnesses: Modulator 2, auxiliary,
diagnostic, and rear axle wheel speed sensors.

4
Auxiliary I/O Connector
An optional auxiliary connector provides a connection to
the MC-30™controller auxiliary feature I/O pins. The five
auxiliaryground-switchinputs andtwoauxiliary outputscan
be activated and configured with a diagnostic tool.
FIGURE 5 - MC-30™CONTROLLER PIGTAIL HARNESS (4S/2M WITH DIAGNOSTIC AND AUXILIARY CONNECTORS
SHOWN)
30-Pin ECU
Connector
8-Pin Auxiliary
(AUX)
3-Pin Modulator 2
(MOD2)
3-Pin Modulator 1
(MOD 1)
4-Pin Diagnostic
(DIAG)
5-Pin Power and
Indicator Lamp
(PWR/WL) 2-Pin Wheel
Speed Sensors
ECU Connector Jackscrew
(Tighten to 15-20 in. lbs.)
Left Rear
(LFT RER)
Right Rear
(RHT RER)
Left Front
(LFT FRT)
Right Front
(RHT FRT)
FIGURE 6 - REMOTE MODULATOR HARNESS (MOD2)
Modulator 2
(MOD2)
To
Pigtail
FIGURE 7 - REMOTE DIAGNOSTIC HARNESS
To
Pigtail To Diagnostic Tool
POWER AND GROUND
Trailer electricalpower issupplied totheMC-30™controller
fromthe ignitionand brakelight circuits.Note:The MC-30™
controller may not function properly when powered with a
battery charger. See Chart 2.

5
ABS INDICATOR LAMP
Trailer Mounted Lamp
The MC-30™controller controls an ABS indicator lamp
to indicate the trailer ABS status. The MC-30™controller
directly controls the ABS indicator lamp by providing a
12.0 VDC signal to turn it on. The other side of the lamp
is grounded. The MC-30™controller must be powered in
order to operate the trailer indicator lamp. Pin D3 of the
30-pin connector is the ABS indicator lamp output.
Dash Mounted Lamp (PLC Controlled)
MC-30™controllermodels withPLC willtransmit asignal to
control a trailer ABS indicator lamp mounted on the dash
of the tractor. MC-30™controller will transmit the status of
the trailer ABS unit over the ignition power pin E1 of the
30-pinconnector. The ignition powerwire (blue wireof the
J560 connector) will carry this signal to the towing vehicle.
MC-30™controllermodelswithPLC supportcommunication
in accordance with SAE J2497.
WHEEL SPEED SENSORS
Wheel speed data is provided to the MC-30™controller
from the Bendix wheel speed sensors. See Figure 8 for
examples. Working with a tone (exciter) ring, the wheel
speed sensors provide the MC-30™controller with an AC
signal, which varies in voltage and frequency in relation
to the speed of the wheel. The MC-30™controller is
configured to receive wheel speed information from 100
tooth tone rings by default. Vehicle axle and ABS control
configurationsdetermineiftwo orfourwheel speedsensors
must be used. See the MC-30™controller’s electrical
system schematic for wheel speed sensor connector pin
locations, Figure 16.
Circuit 7-Pin Trailer 5-Pin ABS 30-Pin ECU
Electrical Power Connector
Connector Connector
Ignition Power (PLC) Pin 7 B Pin E1
(Blue Wire)
Brake Light Power Pin 4 A Pin E3
(Red Wire)
Ground Pin 1 E Pin D2
(White Wire)
Indicator Lamp N/A D Pin D3
(White/Green Wire)
Function Mode Value
Operating Range 8.0 to 16.0 VDC
ECU Active 383 mA
ABS Active 2.4 A @ 12 VDC
(1 modulator)
ABS Active 4.5 A @ 12 VDC
(2 modulators)
CHART 2 - POWER AND GROUND
FIGURE 8 - BENDIX WHEEL SPEED SENSORS
CLIP AND SENSOR INSERTION
90° Speed
Sensors
Straight Speed
Sensors
PREVIOUS AND NEW CLAMPING SLEEVES
WS-24
sensors use
clamping
sleeves with
“BX” in a
swoosh
symbol
Previous
clamping
sleeves have
“BW” in a
diamond
Previous Bendix Wheel Speed Sensors
Previous sensors are all replaced by the
Bendix WS-24™wheel speed sensor shown below.
FIGURE 9
FIGURE 10
Wheel Speed Sensor Clips
The sensor spring clip is designed to firmly hold the wheel
speed sensor in place while also allowing the sensor to
adjust in position as the wheel and hub rotate. Wheel
bearing play and heavily loaded axles will cause sensors
to self-adjust. Proper sensor installation begins by fully
inserting the spring clip into the block, with the retaining
tabs toward the inside of the vehicle. See Figure 9.

6
Wheel Speed Sensor Adjustment
Speed sensors are properly adjusted by gently pushing
(not striking) the sensor into the clip until it makes contact
with the face of the tone ring. The wheel speed sensor
will automatically adjust as the wheel rotates. If rotating
the wheel causes a gap of 0.020 in. or greater, check for
excessive wheel bearing play or tone ring runout. Proper
wheel speed sensor installation is critical to proper ABS
operation. See Figure 10.
M-30T™ABS MODULATOR-VALVES
The M-30T™Bendix®trailer ABS modulator-valve is
controlledbytheEC-30T™controllertomodifydriver applied
airpressuretotheservicebrakesduringABSactivation. The
ABSmodulator-valve isan electro-pneumaticcontrol valve
and is the last valve that air passes through on the way to
thebrakechambers. The holdandexhaust solenoidsofthe
M-30T™modulator-valve are activated to precisely modify
thebrakepressureoncommand. The EC-30T™controlleris
designedtocontrol oneortwo modulator-valveassemblies.
See the MC-30™controller’s electrical system schematic
for ABS modulator connector pin locations, Figure 16.
The M-30T™modulator-valve is available in two mounting
configurations.
FIGURE 11 - M-30T™TANK (NIPPLE) MOUNT
MODULATOR-VALVE
FIGURE 12 - M-30T™BRACKET (FRAME) MOUNT
MODULATOR-VALVE
Tank (Nipple) Mounted
The M-30T™modulator-valve tank-mount assembly is
mounted by using a schedule 80 (heavy gauge steel) 1/2"
nipple directly between the trailer supply tank and the
M-30T™modulator-valve supply port. A tank with a
reinforced port must be used. See Figure 11.
Bracket (Chassis) Mounted
The M-30T™modulator-valve bracket mount assembly is
mounted directly to the trailer frame rail or crossmember.
See Figure 12. The bracket studs are secured using
three 5/16-18 nuts and lock washers torqued to 180-220
in-lbs.
J1708/J1587 DIAGNOSTIC LINK
TheMC-30™controller provides aJ1708/J1587 diagnostic
link with data and power to communicate with the vehicle
and various diagnostic tools. Diagnostics, testing,
configuration, data transfer and other functions can be
performed using this link. The MC-30™controller is
supported by diagnostic tools such as the MPSI Pro-Link®
andBendix®ABSDiagnostic Software. Ignitionpowermust
beprovided tothe MC-30™controller forthe diagnosticlink
to be active. See the MC-30™controller electrical system
schematic for J1708/J1587 diagnostic link pin locations,
Figure 16.
AUXILIARY I/O
Auxiliary Function Inputs
The MC-30™controller offers five auxiliary ground switch
inputs. These inputs can be configured for various
custom functions using a diagnostic tool. See the
MC-30™controller’ssystemelectricalschematic forauxiliary
function input connector pin locations, Figure 16.
Auxiliary Function Outputs
The MC-30™controller offers two auxiliary output drivers.
These outputs can be configured for various custom
functions. Pin F1 of the 30-pin connector is the auxiliary
low side output. Pin K2 of the 30-pin connector is the
auxiliary high side output.
MC-30™CONTROLLER POWER-UP
SEQUENCE
At power-up, the MC-30™controller performs a series of
self-checks that can assist a technician in determining the
status and configuration of the system.
Trailer ABS Indicator lamp
At power-up without detected faults, the trailer ABS
indicator lamp will illuminate for 2.5 seconds as a bulb
check and then turn off.

7
ABS OPERATION
The MC-30™controller uses wheel speed sensors, ABS
modulator-valves and an ECU to control trailer wheels by
axle or by side. By detecting excessive wheel slip during
brakingand adjustingthe pressureto eachbrakechamber,
the MC-30™controller is able to optimize slip between the
tireand the roadsurface. The EC-30T™controllercontrols
theABS modulator-valves, similar to a driver pumping the
brakes. However, theMC-30™controllerisable topumpthe
brakes on the vehicle with greater speed and accuracy.
Axle Control
MC-30™controller axle control will utilize a single ABS
modulator-valve to control wheels from both sides of a
given axle or axles. In the case of an unbalanced braking
surface, axle control will control the high coefficient wheel
just under the lock limit. Temporary periods of wheel lock
are permitted on the low coefficient wheel. Axle control
shouldnot be usedon 5thwheel dolliesor steerable axles.
When braking on even surfaces, an axle-control system
willperform similarto aside control,twomodulator system.
Axle control is available in 2S/1M, 2S/2M and 4S/2M
installations.
Dolly-Axle Control (Select Low)
MC-30™controller dolly-axle control will utilize a single
ABS modulator-valve to control wheels from both sides of
agiven axleor axles. Inthe caseof anunbalancedbraking
surface, dolly-axle control will control the low coefficient
wheel just under the lock limit. Optimal vehicle stability
is achieved by not allowing the high coefficient wheel to
sustainwheellock. When brakingoneven surfaces,a dolly
axle control system will perform similar to side control or
axle control system. Dolly axle control is only available in
2S/1M installations.
Steer Axle Option (MOD2 Select Low)
This option causes MOD2 to be Dolly-Axle controlled and
isonly active whileconfigured for4S/2MAxle control. This
configurationoption should be setwhen MOD2 isinstalled
on a forward or steer axle of a full trailer. SteerAxle option
can be set using a diagnostic tool or by purchasing an
MC-30™controller unit with this option pre-set.
Side Control
The MC-30™controller will utilize a singleABS modulator-
valveto controloneor morewheelson agiven vehicleside.
In the case of an unbalanced braking surface, MC-30™
controllerside controlwill individuallycontrol eachside just
under the lock limit. Side control is available in 2S/2M and
4S/2M installations.
Normal Braking
During normal braking, the MC-30™controller functions as
a standard relay valve. As brakes are applied or released
by the driver, the control signal from the tractor foot valve
causes the M-30T™modulator-valve to apply proportional
pressure to the trailer brake chambers.
If a PLC tractor and PLC trailer are powered at the same
time, the MC-30™controller will also trigger a bulb check
on the tractor dash using PLC.
Diagnostic LED Display of Configuration
Atpower-up,the diagnosticLEDsallilluminate, thendisplay
thecurrent configuration forsensors, modulators andABS
control. See chart 3. After displaying the configuration,
only the green VLT LED will stay on. However, if a fault is
detected, the faulted component will be displayed by the
red diagnostic LEDs.
CHART 4 - MC-30™CONTROLLER ABS CONFIGURATIONS
System Sensors Modulators Available
Configuration 2 4 1 2 ABS Control Settings
2S/1M X X Axle or Dolly-Axle
2S/2M X X Axle or Side
4S/2M X X Axle or Side
CHART 3 - LED POWER-UP SEQUENCE
MC-30™Controller – LED Power-Up Sequence
At power-up All LEDs
1st blink displays number of wheel speed sensors
2 Sensors SEN-FRT
4 Sensors SEN-RER-FRT
2nd blink displays modulator configuration
1 Modulator (Dolly-Axle control) MOD
1 Modulator (Axle control) MOD-FRT
2 Modulators (Axle control) MOD-RER-FRT
2 Modulators (Side control) MOD-LFT-RHT
Normal Operation
No Faults VLT (green) LED illuminated only
Modulator Chuff Test at Power-Up
At power-up, the MC-30™controller activates a modulator
chuff test. This electrical and pneumatic ABS modulator
testcan assistthe technicianin verifyingthatthe modulator
wiring and installation are correct. With brake pressure
applied, a properly installed modulator will cause five
rapid audible chuffs of air pressure. If two modulators
are installed, the MC-30™controller activates 5 chuffs at
Modulator1 (MOD 1)then Modulator2 (MOD2). Thechuff
sequence is then repeated.
Ifthe modulator iswired incorrectly, themodulator willonly
produceone chuff,or nochuffat all. If anissue isdetected
during the modulator chuff test, compare the modulator
wiring and plumbing to the MC-30™controller’s electrical
system schematic and make repairs. See Figures 16 and
17.

8
2S/1M Axle Dolly-Axle
2S/2M Axle Side
4S/2M Axle Side
SELF-CONFIGURATION / CONTROL TOGGLE
When activated with a magnet or diagnostic tool, the
self-configuration feature allows for wheel speed sensor,
modulator and ABS control settings to be altered. This
is generally performed after replacement of an MC-30™
controller. See chart 5.
CAUTION: An incorrectABS configuration may cause
a fault indication or degraded ABS performance. All
MC-30™controller’s service replacement parts are
initially defaulted to 4S/2M side control and may need
to be reconfigured upon installation. Before and after
activating a self-configuration, always determine
the current ABS configuration by monitoring the
diagnostic LEDs at power-up or by activating blink
code diagnostics.
Wheel Speed Sensors
The MC-30™controller will self-configure for either two
or four wheel speed sensors. If either rear (RER) wheel
speed sensors are detected, four wheel speed sensors
will be selected. If neither rear wheel speed sensors are
detected,the MC-30™controllerwillconfigurefor twowheel
speed sensors. The MC-30™controller will default to two
ABS modulators for any four sensor configuration.
Whenconfigured fortwo wheelspeed sensors,Right Front
(RHT FRT) and Left Front (LFT FRT) wheel speed sensor
inputs must be used, even if the wheel speed sensors are
not physically located on the front axle.
Modulators
The EC-30T™controller will self-configure for either one or
twomodulators. The EC-30T™controllerwill automatically
configure for twoABS modulators if it detects Modulator 2
(MOD2) and/or either of the rear wheel speed sensors. If
MOD2 is not detected and no rear wheel speed sensors
are detected, the EC-30T™controller will configure for a
single ABS modulator.
Whenconfiguredfor asingle modulator, Modulator1(MOD
1) must be used.
ABS Control Toggle
TheMC-30™ABS controllercontrol setting canbe toggled
between Control Group A and Control Group B. When
activated,the MC-30™controllerwill toggletheABS control
between (axle control) and (dolly-axle control or side
control). Whena self-configuration occurswithout anABS
control toggle, the ABS control group does not change.
See chart 6 and chart 7.
Self-Configuration Procedure
Verify that the ECU, wheel speed sensor and ABS
modulator connectors are in place and then power the
MC-30™controller.
Determinethe currentABSconfiguration bymonitoring the
diagnostic LEDs at power-up or by activating blink code
diagnostics.
Hold a magnet on the reset location of the diagnostic
display. All of the LEDs will be on while the magnet is
held in place.
After holding the magnet in place for 20 seconds, the
LEDs will begin to roll and the MC-30™controller will self-
configurefor the numberof detectedwheel speed sensors
and modulators. If it is not desired to toggle the ABS
control, remove the magnet.
The MC-30™controller will then automatically go through
the power-up sequence and display the new configuration
on the diagnostic LEDs. Verify the newABS configuration
by monitoring the diagnostic LEDs at power-up or by
activating blink code diagnostics.
If an erroneous sensor or modulator combination is
detected during the self-configuration, fault codes are
activated when the MC-30™controller returns to normal
operating mode.
ABS Control Toggle Procedure
Toalso toggletheABScontrol, continueto holdthe magnet
in place while the LEDs are rolling, for an additional 20
seconds (total of 40 seconds). After holding the magnet in
place for 40 seconds, the LEDs will begin to rapidly flash.
At this point the MC-30™controller will toggle the ABS
control configuration. Remove the magnet.
The MC-30™controller will then automatically go through
the power-up sequence and display the new configuration
on the diagnostic LEDs. Verify the new ABS configuration
by monitoring the diagnostic LEDs at power-up or by
activating blink code diagnostics.
CHART 5 - SELF-CONFIGURATION AND ABS CONTROL TOGGLE ACTIVATION
CHART 6 - ABS CONFIGURATION AND CONTROL TOGGLE
ABS
Configuration Control Group A Control Group B
Toggle
Toggle
Toggle

9
Your trailer has two wheel speed
sensors and oneABS modulator that
is plumbed for axle control.
The MC-30™controller you have
installed is currently configured for
4S/2M side control.
Providepower tothe MC-30™controller
and verify the current configuration
using the LEDs or blink codes.
4S/2M Side
Hold magnet in place for 20
seconds.
The LEDs will begin to roll as the
installed sensors and modulators are
detected.
2S/1M Dolly-Axle
WiththeLEDs rolling,continuetohold
the magnet in place for an additional
20 seconds. (Total of 40 seconds)
The LEDs begin to flash as the ABS
control toggle activation occurs.
Remove magnet.
2S/1M Axle
Verify the new configuration using
the LEDs or blink codes.
4S/2M Side to 2S/1M Axle
CHART 7 - EXAMPLES OF SELF-CONFIGURATION AND ABS CONTROL TOGGLE (1 of 2)
Your dolly or steer axle has two
wheel speed sensors and one ABS
modulator that is plumbed for axle
control.
The MC-30™controller you have
installed is currently configured for
2S/1M axle control.
Providepower to theMC-30™controller
and verify the current configuration
using the LEDs or blink codes.
2S/1M Axle
Hold magnet in place for 20
seconds.
The LEDs will begin to roll as the
installed sensors and modulators are
detected.
2S/1M Axle
WiththeLEDs rolling,continuetohold
the magnet in place for an additional
20 seconds. (Total of 40 seconds)
The LEDs begin to flash as the ABS
control toggle activation occurs.
Remove magnet.
2S/1M Dolly-Axle
Verify the new configuration using
the LEDs or blink codes.
2S/1M Axle to
2S/1M Dolly-Axle

10
Your trailer has two wheel speed
sensors and two ABS modulators
that are plumbed for axle control.
The MC-30™controller you have
installed is currently configured for
4S/2M axle control.
Providepowertothe MC-30™controller
and verify the current configuration
using the LEDs or blink codes.
4S/2M Axle
Hold magnet in place for 20
seconds.
The LEDs will begin to roll as the
installed sensors and modulators are
detected.
Remove the magnet.
2S/2M Axle
Stop! You do not need to perform an
ABS control toggle in this case.
Verify the new configuration using
the LEDs or blink codes.
4S/2M Axle to 2S/2M Axle
CHART 7 - EXAMPLES OF SELF-CONFIGURATION AND ABS CONTROL TOGGLE (2 of 2)
Your trailer has two wheel speed
sensors and two ABS modulators
that are plumbed for side control.
The MC-30™controller you have
installed is currently configured for
4S/2M side control.
Provide power to the MC-30™controller
and verify the current configuration
using the LEDs or blink codes.
4S/2M Side
Hold magnet in place for 20
seconds.
The LEDs will begin to roll as the
installed sensors and modulators are
detected.
Remove the magnet.
2S/1M Dolly-Axle
Stop! You do not need to perform an
ABS control toggle in this case.
Verify the new configuration using
the LEDs or blink codes.
4S/2M Side to
2S/1M Dolly-Axle