Bendix Ec-30 abs-atc controller User manual

SD-13-4815

TABLEOFCONTENTS . . . . . . . . . . . . . . . . . . . . . . . PAGE

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

EC-30™Controller Hardware Configurations . . . . . . . . 3

EC-30™Controller With PLC . . . . . . . . . . . . . . . . . . . . . . 3

EC-30™Controller Inputs . . . . . . . . . . . . . . . . . . . . . . . . 4

EC-30™Controller Outputs . . . . . . . . . . . . . . . . . . . . . . . 4

Power-Up Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

ABS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ATC Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Auto-Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

EC-30™Controller Configurable Parameters . . . . . . . . 8

EC-30™Controller Self-Configuration . . . . . . . . . . . . . . 8

Fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

ABS Partial Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

EC-30™Controller Diagnostic Display . . . . . . . . . . . . . . 9

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™Controller Assembly . . . . . . . . 16

Installing a New EC-30™Controller . . . . . . . . . . . . . . . 16

ABS andATC Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

INTRODUCTION

TheBendix®EC-30™isanelectronicABS(antilockbraking

system) controller. It is the base component in a family of

ABSassembliesforheavyandmediumdutybuses,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

providesthe vehicle withimprovedstability and steerability

duringbraking. TheEC-30™controllerwillalsoreducevehicle

stopping distance on most surfaces.

In addition to the ABS function, the EC-30™controller can

beconfiguredtoprovideanATC(automatic tractioncontrol)

feature. Bendix ATC can improve vehicle traction during

acceleration on adverse road conditions. ATC can utilize

enginetorque limiting and/ordifferential braking toimprove

vehicletraction.

Bendix®EC-30™ABS / ATC Controller

FIGURE 1 - EC-30™CONTROLLER

18-pin

Connector

MountingInserts

(4 Places)

LEDDiagnostic

Display

30-pin

Connector

Part Number

Label

COMPONENTS

The EC-30™controller ABS function utilizes the following

components:

- Wheelspeedsensors(4or6,dependingonconfiguration)

- Electro-pneumaticABSmodulatorvalves(4)

- Dash mounted tractor ABS warning lamp (relay

controlled)

- Servicebrakerelayvalve

- DashmountedtrailerABSwarninglamp(towingvehicles

manufacturedafter March1, 2001)

- Blinkcode activation switch (optional)

The EC-30™controller ATC function utilizes the following

additionalcomponents:

- ATC modulator - Integral to the ATR (antilock/traction

relay)valveassembly

- DashmountedATCactive/warning lamp

- Serial communication to engine control module

(interfaceswith throttle inputand engine torque)

- ATCenable/disable switch

ENCLOSURE

The EC-30™controller electronics are contained in a non-

metallic housing and are environmentally protected by a

hard epoxy potting compound. The design of the EC-30™

controller electronics is robust against radio, electro-

magneticandenvironmental interference.

ApatentedLED (lightemittingdiode) diagnosticdisplayand

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.

EC-30™Controller Comparison to EC-16™and

EC-17™Controllers

The EC-30™controller has been designed to replace the

EC-17™andthe EC-16™controllersasthe standardBendix

ABScontrollerforOEM 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

metalenclosure.

TheEC-30™controllerABSwarninglamppower-upsequence

has been simplified compared to the EC-17™and EC-16™

controllers.

TheEC-30™controllerABSwarninglamp,atpower-upwithout

faults, will illuminate for 2.5 seconds and then turn off.

TheABS warning lampfor EC-17™and EC-16™controllers,

atpower-up without faults, will illuminatefor approximately

8seconds and flash twicebefore turning off.

FIGURE 2 - EC-30™CONTROLLER WITH ATR VALVE

ATC

Modulator

Connector

ABS / ATC

Assembly EC-30™

Controller

ATC

Modulator

(integral)

ATRVALVE

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™Valve BobtailBrake Tractors

Proportioning Only

AT-30 ATR-1™Valve ATC All

AT-30BP ATR-2™Valve ATC&Bobtail Tractors

BrakeProportioning Only

CHART 2 - EC-30™CONTROLLER / VALVE ASSEMBLIES

CHART 1 - ECU DIFFERENCES (EC-30™, EC-17™, EC-16™

CONTROLLERS)

ECU Enclosure ABS Warning Lamp

Model Power-Up Sequence

EC-30™Plastic with Plastic 2.5 seconds on, then off

Controller Mounting Inserts

EC-17™Plastic with Metal 8 seconds on, two

Controller Mounting Inserts flashes, then off

EC-16™Metal Enclosure 8 seconds on, two

Controller flashes, then off

MOUNTING

ECU Only

TheEC-30™controllercanbebracketmountedtothevehicle

cab or chassis as a stand alone ECU. See figure 1.

Valve Mounted EC-30™Controller

The EC-30™controller can be assembled on one of four

differentvalvemodels. Thecontrollervalveassemblyis then

mountedin place of the standard service brakerelay valve

onthevehicle. Anassemblymodeldesignationisassigned

when the EC-30™controller is mounted on anAR (antilock

relay) valve or anATR (antilock/traction relay) valve. See

figure2. Some modelsinclude bobtail proportioningand/or

ATC functions. See chart 2.

EC-30™CONTROLLER HARDWARE

CONFIGURATIONS

The EC-30™controller ABS ECU is available in different

hardware configurations in order to support various ABS,

ATCand power line carrier (PLC) features. See chart 3.

EC-30™controllerpremiumPLChardwarecanbeconfigured

forfour orsix sensors,withor withoutATC, andPLC canbe

disabled.

EC-30™controller basic models can not be configured for

six sensors orATC.

PLChardware is needed tosupport PLC communication.

Alwaysverify that you are workingwith the correct EC-30™

controllerby referring to thepart number label onthe ECU.

EC-30™CONTROLLER WITH PLC

EffectiveMarch 1,2001, alltowing vehicles mustcontrol an

in-cabtrailerABSwarninglamp. Trailersbuiltafterthisdate

willtransmit thestatusofthe trailerABSunitover thepower

line (blue wire of the J560 connector) to the tractor using

PLCcommunications.

The PLC signal is usually broadcasted by the trailer ABS

ECU. TheapplicationofPLCtechnologyfortheheavyvehicle

industry is known as PLC4Trucks. The Bendix®EC-30™

controllerpremiumwithPLC,andbasicwithPLC,willsupport

PLCcommunicationinaccordancewithSAE J2497.

Identifying an EC-30™Controller with PLC

AnEC-30™controller with or without PLCcanbeidentified

by the individual part number label on the ECU. Also, an

EC-30™controller may have one of the following labels

applied:

Measuring / Identifying the PLC Signal

An oscilloscope can be used to verify the presence of a

PLCsignalonthepowerline. ThePLCsignalisanamplitude

andfrequencymodulated signal. Dependingon thefiltering

and load on the power line, the PLC signal amplitude can

rangefrom 5.0mVp-p to 7.0Vp-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™controller. See figures 3 & 4.

The EC-30™controller will not broadcast PLC messages

unless it is specially programmed to do so. With this

standardconfiguration,anABS trailerequipped withPLC or

aPLC diagnostictool will needto beattached to thevehicle

in order to generate a PLC signal on the power line.

1 Requiredfor all towing vehiclesbuilt after March 1, 2001.

CHART 3 - EC-30™CONTROLLER HARDWARE CONFIGURATIONS

FIGURE 3 - POWER LINE WITHOUT PLC SIGNAL

FIGURE 4 - POWER LINE WITH PLC SIGNAL

EC-30 Hardware Sensors ATC J1587 J1939 Blink J1922 J1939 PLC Trailer

Configurations Codes ABS WL1

Basic 4XXXX

Premium 4, 6 X X X X X

BasicPLC 4XXXXXX

Premium PLC 4, 6 X X X X X X X

EC-17/EC-16Service 4, 6 X X X X X X

Replacement

Diagnostics Engine

Communication

ECU does not support an in-cab

Trailer ABS warning lamp.

ECUsupports IN-CABTrailer

ABS warning lamp.

White Label:

Orange Label:

FIGURE 5 - BENDIX®WS-20™AND WS-24™WHEEL SPEED

SENSORS

EC-30™CONTROLLER INPUTS

Power and Ground

Poweris supplied tothe EC-30™controllerfromthe ignition

circuit through a 30 Amp fuse. The EC-30™controller is

groundedtothevehiclechassis. ForEC-30™controllerpower

andground connector pin locations,seeEC-30™controller

system schematic, Figure 14.

Wheel Speed Sensors

Wheelspeed datais providedto theEC-30™controller from

theBendix®WS-20™orWS-24™wheel speedsensors. See

figure 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

frequencyinrelation tothe speedofthe wheel. TheEC-30™

controller can be configured to receive wheel speed

informationfrom 100 or 86tooth exciter rings. Vehicle axle

configurations andATC features determine the number of

speed sensors that must be used. A vehicle with a single

reardriveaxle(4x2,4x4or6x2) requiresfourspeed 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.

Blink Code Switch

The EC-30™controller can be configured to support an

optional diagnostic blink code switch to ground, which can

beusedto activateseveral functionsavailablethrough blink

code diagnostics. Pin F3, of the 30-pin connector, is the

blink code switch input.

Three Position Switch for ATC and Blink Codes

TheEC-30™controllercan beconfiguredto receiveboththe

ATCenable/disablesignalandtheblinkcodeactivationsignal

fromasinglethree-positionswitch. Inthiscase,thecommon

position of the switch is connected to pin F2 of the 30-pin

connector. Thenormally-open switchposition isconnected

to+12VDCtodisableATC. Thenormally-open(momentary)

switchpositionisconnectedtogroundtoactivateblinkcodes.

Whenconfiguredinthis manner,there isno wireinstalled 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 configured to support an

optionalbrake switch input. The brake switchinput can be

used in accordance with ABS andATC performance. Pin

A2, of the 18-pin connector, is the brake switch input.

EC-30™CONTROLLER OUTPUTS

ABS Modulators

Bendix®ABSmodulators (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 figure 6 for illustration. The ABS

modulator, an electro-pneumatic control valve, is the last

valvethatairpassesthroughonitswaytothebrakechamber.

Themodulator holdandexhaust solenoidsareactivated to

preciselymodify the brake pressure duringABS. Thehold

solenoid is normally open and the exhaust solenoid is

normally closed. The EC-30™controller is able to control

four individual modulator assemblies. ForABS modulator

connector pin locations see the EC-30™controller system

schematic,figure 13.

ATC Enable/Disable Switch

Premium EC-30™controller models, configured for ATC,

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 theATC is disabled. Pin F2,

of the 30-pin connector is the ATC enable/disable switch

input.

J1939 - ATC Enable/Disable Switch

TheEC-30™controllercanbeconfiguredtoreceivethestatus

oftheATCenable/disable switchover theSAE 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

configured in this manner, there will be no wire installed in

pinF2ofthe30-pinECUconnector. In theevent thatJ1939

communicationsis lost between theEC-30™controller and

thevehicle controller,the EC-30™controller will disablethe

ATCfunction.

90° Speed

Sensors

Straight Speed

Sensors

WS-24™

Sensor

WS-20™

Sensor

WS-20™

Sensor

WS-24™

Sensor

FIGURE 6 - M-30™, M-32™, AND M-32QR™MODULATORS

Delivery

(Port 2)

Supply

(Port 1)

Exhaust

(Port 3)

Electrical

Connector

M-30™

Modulator

M-32QR™

Modulator M-32™

Modulator

Trailer ABS Warning Lamp

EC-30™controller models with PLC can be configured to

controla trailerABSwarning lamp(located in thedash) 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 trailerABS warning lamp output.

J1939/J1587 Trailer ABS Warning Lamp

The EC-30™controller can be configured to broadcast the

trailer ABS status over the SAE J1939 or the SAE J1587

serialcommunicationslinks. Inthiscase, avehiclecontroller

will directly operate the trailer ABS warning lamp. When

configuredinthismanner,there isnowireinstalledinpinE2

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

warninglamp.

J1708/J1587 Diagnostic Link (J1939)

The EC-30™controller provides a J1708/J1587 diagnostic

linkto communicatewith the vehicleand variousdiagnostic

tools. Diagnostics, system configuration, data uploading

anddownloadingandotherfunctionscanbeperformedusing

this link. The EC-30™controller is supported by tools such

asBendix®ABSDiagnosticSoftware,theBendix®DCIhand

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™controllercanbe configured 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

enginetorqueduringATCoperation.

ATC Active/Warning Lamp

PremiumEC-30™controller modelsconfigured forATCcan

controlanATC active/warninglamp toindicatethe statusof

theATCsystem. TheATCactive/warninglampflasheswhen

ATCisactiveand staysonif anATCsystem faultisdetected

orATC is disabled by theATC enable/disable switch. The

EC-30™controller directly controls theATC active/warning

lamp by providing a ground path when the lamp is to be

activated. PinC2,of the30-pinconnector,is theATCactive/

warninglamp output.

J1939ATCActive/Warning Lamp

PremiumEC-30™controller modelsconfigured forATCcan

be configured to broadcast the status of the ATC active/

warning lamp over the SAE J1939 serial communications

link. Inthis case a vehicledash controller directly operates

the ATC active/warning lamp. When configured in this

manner, there is no wire installed in pin C2 of the 30-pin

connector. In theevent thatJ1939 communicationsare lost

between the EC-30™controller and the vehicle dash

controller, the dash controller will activate the ATC active/

warninglamp.

ATC Modulator

PremiumEC-30™controllermodelsconfiguredfordifferential

braking ATC will activate the ATC modulator during ATC

situations. TheATC modulator is an electrically controlled

air valve integral to theATR valve. Pins D2 and D3, of the

18-pinconnector,control theATC modulator. Aconnection

to the ATC modulator is provided via a two-pin Deutsch

connectorfrom theATRvalve. See figure 2.

ABS Warning Lamp

The EC-30™controller controls an ABS warning lamp to

indicatetheABSunitstatus. TheEC-30™controllerprovides

aground signal to activate anABS 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

orderto illuminatein afail-safemanner duringanABS ECU

failure. PinE3, of the30-pinconnector,is theABS warning

lampoutput.

J1939ABS Warning Lamp

The EC-30™controller can be configured to broadcast the

ABSstatusovertheSAEJ1939serial communicationslink.

Avehicle dash controller directly controls theABS warning

lamp. When configured in this manner, there is no wire

installed in pin E3 of the 30-pin connector. If J1939

communicationsis lost between theEC-30™controllerand

the vehicle dash controller, the dash controller will activate

theABS warning lamp.

Retarder Disable Relay

The EC-30™controller controls an engine or transmission

retarderdisablerelay. Theretarderactivation wire isrouted

through the normally-closed contacts of the relay. The

EC-30™controller provides a ground path to activate the

relayandinterruptpowertotheretarderduringABSoperation.

This output may also connect directly to a transmission

ECU. PinK1,of the30-pinconnector,is theretarderdisable

relayoutput.

J1939/J1922 Retarder Disable

The EC-30™controller can be configured to interrupt the

engine or transmission retarder over the SAE J1939 serial

communicationslink. (J1922forsomeservice replacement

models). The retarder will be disabled duringABS via the

serial communications. When configured 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

beessentialtoABSperformanceandishighlyrecommended

forvehicles equippedwith a capableretarder.

J1939/J1922 Torque Converter Lock Disable

The EC-30™controller can be configured to interrupt the

automatictransmission torqueconverter lockfunction, over

theSAEJ1939serialcommunicationslink. (J1922for some

service replacement models). The converter lock will be

disabledduringABS viatheserial communications. Useof

thetorque converter lockdisable function maybeessential

toABSperformanceand ishighlyrecommendedforvehicles

equippedwith a capable transmission.

CHART 4 - LED POWER-UP DISPLAY OF EC-30™

CONTROLLER CONFIGURATION

LEDPower-UpSequence LEDs

1st When power is applied All LEDs Illuminate

Then the LEDs indicate one of the following:

2nd 4 Sensors SEN-RER-FRT

6 Sensors SEN-RER-MID-FRT

Then the LEDs indicate one of the following:

ATC Engine Limiting TRC

3RD ATC Differential Braking TRC-MOD

NoATC N/A

The LEDs will then indicate system status:

4th Normal Operation (if no faults) VLT

POWER-UP SEQUENCE

ABS Warning Lamp at Power-Up

Atpower-up without detectedfaults,theABSwarning lamp

turns on for 2.5 seconds and then turns off. See figure 7.

ATC Active / Warning Lamp at Power-Up

Atpower-up, theATC active/warninglamp displaystheATC

control configuration and then turns off. Aseries of blinks

indicates if theATC is configured for engine torque limiting

and differential braking, engine torque limiting only, or

differentialbraking only. Seefigure 7.

Driver

RightFront

Left Front

Right Rear

Left Rear

Right Mid

Left Mid

FIGURE 8 - VEHICLE ORIENTATION

FIGURE 7 - EC-30™CONTROLLER POWER-UP LAMP

SEQUENCE

Diagnostic LEDs at Power-Up

At power-up, the diagnostic LEDs all turn on, then display

the configuration for sensors and the ATC. After showing

the configuration, only the green VLT LED will stay on.

However, ifa faultisdetected,thefaulted componentwill be

identified by the red LEDs. See chart 4.

Retarder Disable Relay at Power-Up

Atpower-up, theEC-30™controllermay toggle theretarder

disable relay. If the relay is located in the cab it is usually

audibleto the operator.

Modulator Chuff Test at Power-Up

At power-up, the EC-30™controller activates a patented

modulatorchufftest. Themodulatorchufftest isanelectrical

and pneumatic ABS modulator test, that can assist the

technicianinverifyingpropermodulatorwiringandinstallation.

Withbrake pressureapplied, aproperly installedmodulator

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

modulatorwillproduce adoublechuff, orno chuffatall. The

EC-30™controlleractivatesachuff ateach modulatorin the

followingsequence:

Right-Front,Left-Front,Right-Rear, Left-Rear. Seefigure8.

Thechuffsequenceisthenrepeatedforatotalof8chuffs. If

an issue is detected during the modulator chuff test, look

forfaultsandcomparethemodulatorwiringandplumbingto

the EC-30™controller system schematic shown in figure 13.

TrailerABS WL

(PLC Detected)

TrailerABS WL

(PLC Not Detected) ON

OFF

Powered Vehicle ABS WL ON

OFF

Engine torque

limiting and

differential braking

OFF

Engine torque

limiting only

OFF

Differential braking only

OFF

NoATC

OFF

Trailer ABS Warning Lamp

At power-up, the trailerABS warning lamp turns on for 2.5

secondsand thenturns off. This onlyoccurs ifaPLC trailer

or PLC diagnostic tool is connected to the tractor at the

time ignition power is applied. Only an EC-30™controller

withPLC installedon atowing vehiclewill supportthe trailer

ABS lamp.

ABS OPERATION

Bendix ABS uses wheel speed sensors, ABS modulators

andanECUtocontroleitherfourorsixwheels. Bymonitoring

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

excessivewheel slip is detected,the EC-30™controller will

activate ABS. The EC-30™controller controls the ABS

modulators to simulate a driver pumping the brakes.

However,the EC-30™controlleris abletopump eachbrake

on the vehicle independently, and with greater speed and

accuracythan a driver.

Front Axle Control

Although both steering-axle wheels are controlled by

individualABS modulators, the EC-30™controller doesnot

control them completely independently. The EC-30™

controller uses a Modified Individual Regulation (MIR)

philosophywhich blendsthe appliedbraking forcebetween

the two steering axle brakes. MIR is used to minimize

steering wheel pull whileABS is active on an uneven road

surface(e.g. ice and asphalt).

Single Rear Axle Control

Onvehicleswithasinglerearaxle(4x2),therearaxlewheels

arecontrolled independently. Therefore,brake application

pressure at each wheel is adjusted according to the wheel

behaviorontheroadsurface.

Dual Rear Axle Control

For vehicles with dual rear axles (6x2 or 6x4), one ABS

modulatorcontrolsbothrightwheelsandtheothermodulator

controlsbothleftwheels. Bothwheels oneach sidereceive

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

Duringnormal braking,brake pressureisdelivered through

theABS modulatorand intothe brakeactuator. Ifthewheel

speedsensors do notdetect an excessiveslip, the EC-30™

controllerdoesnotactivateABScontrolandthevehiclestops

withnormal braking.

ATC OPERATION

JustasABS improves vehicle stabilityduring braking,ATC

improves vehicle stability and traction during vehicle

acceleration. By adding anATC 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, andreacts tobring thewheel spin

undercontrol. The EC-30™controller can be configured to

useenginetorquelimitingand/ordifferentialbrakingtocontrol

wheel spin. For optimal ATC performance, both methods

arerecommended.

During ATC activation, the EC-30™controller will blink the

ATCactive/warninglamptoadvisethedriverthatdrive-wheel

spin is occurring. When ATC is no longer active, the ATC

active/warninglamp turnsoff.

Engine Torque Limiting ATC

The engine torque limiting feature allows the EC-30™

controller to reduce engine torque to a suitable level, in

relationtotheamountof availabletraction. Whentheengine

torqueis controlled,wheel slip canbe optimized,producing

moretraction betweenthe wheel androad surface. Engine

torquelimitingisespeciallybeneficialinavoidanceofapower

jackknifeandwhenalldrivewheelsareonanequallyslippery

surface. The EC-30™controller will verify that the driver is

pressing the accelerator (using J1939 or J1922) prior to

initiatinganATCevent.

InorderfortheenginetorquelimitingATCfeaturetobeused,

thevehiclemustbeequippedwithanelectronicallycontrolled

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.

Differential Braking ATC

Differential braking ATC allows the EC-30™controller to

graduallyapply the brake ona spinning drive wheel. Since

thevehicle'sdifferentialtendstodrivethewheelthatpresents

theleastresistance(thewheel onthemostslipperysurface),

aslight brakeapplication tothis wheelforces thedifferential

todrivethewheelontheoppositeside. TheEC-30™controller

applies brake pressure to both rear-axle ABS modulators

by energizing the ATC modulator. The EC-30™controller

can then apply pressure only to the spinning wheel by

controllingtheABS modulators.

DifferentialbrakingATC canbeactivated onlywhen vehicle

speedisunder25mphandonedrivewheelisspinningfaster

than the others.

In the event that differential braking, ATC is active for an

excessive time period, the EC-30™controller will disable

ATCtopreventoverheatingandfadingofbrakes. TheEC-30™

controllerwillre-enableATCafterashortperiodof time. The

ATC active/warninglampwillbeonwhiletheATCisdisabled.

In order for the differential braking control to be used, the

vehicle must be equipped with an antilock/traction relay

(ATR)valve (ATR-1orATR-2). The vehiclealsomust have

anelectronically controlled engine throttle.

ATC Enable/Disable Switch

TheATCenable/disableswitchallowstheoperatortoenable

or disable the ATC feature as necessary. ATC can be

disabledwhilethevehicleisstationaryorinmotion. However,

ATCwillnot re-enableuntil thevehicle comesto acomplete

stop, even with the switch in the enable position. TheATC

active/warninglamp will be on whiletheATC is disabled.

AUTO-CALIBRATION

Auto-calibrationisafeaturethatallowstheEC-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

approximately4 percent.

Tiresize (rollingradius) settinginformation canbe 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

Bendixdealer.

EC-30™CONTROLLER CONFIGURABLE

PARAMETERS

The EC-30™controller has various configurable 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

configurable 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 Bendixor refer toyour localauthorized

Bendixdealer.

EC-30

™

CONTROLLER SELF-CONFIGURATION

The self-configuration feature allows wheel speed sensor

andATC configurations tobealtered when activated witha

magnetordiagnostictool. Thisisgenerallyperformedshortly

afterinstallingor replacing an EC-30™controller.

Self-Configuration of Wheel Speed Sensors

The number of speed sensors connected to the EC-30™

controller will be detected during the self-configuration

process. TheEC-30™controllerwillconfigureforsixsensors

ifit detects oneor both Midsensors. If only oneMidsensor

is detected, the ABS warning lamp and appropriate

diagnosticLEDs will illuminate followingthe self-configure.

If no Mid sensors are detected, the EC-30™controller will

configurefor foursensors.

Self-Configuration of ATC

Inorder to self-configurefor engine torquelimitingATC,the

following must be connected to the EC-30™controller and

beoperational:

- J1939or J1922 communication linktothe engine

- ATCactive/warninglamp

- ATCenable/disableswitch(must betoggledprior toself-

configuration)

Inordertoself-configurefor differentialbrakingATC,theATC

modulatormust alsobe connected tothe EC-30™controller

andbeoperational.

Some EC-30™controller part numbers will not support six

wheel speed sensors or ATC. To insure 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-Configuration Procedure

Verifythatall ECU,communication, sensor,ABSmodulator

andATC modulator connectors are in place and then turn

theignitionpoweron. ToggletheATCenable/disableswitch,

ifequipped.

Activate an EC-30™controller self-configuration by one of

thefollowing actions:

- Hold a magnet on the reset location of the diagnostic

display for about 20 seconds (until the LEDs begin to

rapidlyroll), then removethe magnet.

- Press the DCI reset switch for about 20 seconds (until

the LEDs begin to rapidly roll), then release the switch.

- Usetheself-configurationmenuselectiononBendixABS

DiagnosticSoftware or the MPSI tool.

When the self-configuration process is complete, the

EC-30™controller will automatically go through the power-

up sequence and show the new configuration on the

diagnostic display. If the EC-30™controller was properly

configured for ATC, the ATC active/warning lamp will also

showtheATCconfiguration. Refer tothe EC-30™controller

Power-UpSequence section.

FAULT DETECTION

The EC-30™controller contains self-testing diagnostic

circuitry that continuously checks for proper operation of

theABS/ATCcomponentsandwiring. TheEC-30™controller

controlsdashmountedwarninglampstoadvisethedriverof

the status of the system.

When the EC-30™controller senses an erroneous system

condition, it stores the fault code in memory, activates the

appropriatewarninglampanddisablesallorpartoftheeffected

ABSorATCfunctions. Thefaultedcomponentisalsoidentified

on the diagnostic display on the EC-30™controller.

In most cases, the EC-30™controller will automatically reset

(self-heal) the active fault code when the fault is corrected.

However,repeatedoccurrencesofagivenfaultwillcausethe

fault code to latch. Once the fault code is latched, a manual

reset is required. Latching of faults can assist in the

troubleshootingofintermittentfaults. Thefaultcodeis stored

intheEC-30™controllermemory,evenwhenpowerisremoved.

Afterrepair,latchedfaultcodescanberesetbybrieflyholding

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.

ABS PARTIAL SHUTDOWN

Depending which component the fault is detected on, the

ABS and ATC functions may be fully or partially disabled.

Evenwith theABSwarning lamp on, the EC-30™controller

maystillprovideABSfunction onwheelsthatarenotaffected

by the fault. The EC-30™controller should be serviced as

soon as possible.

Front ABS Modulator Fault

ABSon the affectedwheelis disabled. ABS andATConall

otherwheels remainsactive.

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

remainsactive.

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.

ECU Fault

ABS andATC 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. Operatingvoltage range is 9.0to 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 figure 9 for illustration.

Notoolsareneededtoread theEC-30™controllerdiagnostic

display. A fault displayed on the LEDs will always be

accompanied by the illumination of theABS warning lamp

and/ortheATC active/warninglamp.

Reading a Fault

When a fault is detected, the EC-30™controller identifies

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 FRT-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

troubleshootingoffaultsdisplayedbytheLEDs,goto section

F,Troubleshooting.

Thered diagnostic LEDsonly indicate activesystem 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.

Iffaults occuron multiplecomponents, thediagnosticLEDs

willdisplayonefault atatime. When thefirstfault isrepaired

and the EC-30™controller is reset, the next fault will be

displayed on the LEDs.

Fault Reset

After the fault is corrected, the active fault code and LEDs

can be reset by briefly 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

LEDsdo notgo onwhenthe magnetis 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: AnEC-30™controller self-configuration willoccurif a

magnet is held at the reset location for greater than 20

seconds.

Mid Axle

Rear Axle

Right Side

Left Side

ATC

Modulator

Sensor

ECU

FIGURE 9 - EC-30™CONTROLLER LED DIAGNOSTIC

DISPLAY

Magnetic

Reset Switch

Front Axle

Voltage

BLINK CODE DIAGNOSTICS

TheEC-30™controllerprovidesdiagnostic andconfiguration

functionsusingblink codediagnostics. Whenthe blinkcode

mode is activated, the EC-30™controller flashes the ABS

warninglamp tocommunicate activefaultcodes, faultcode

history or, ABS and ATC configurations. The blink code

diagnostics mode can also be used to reset active fault

codes. See chart 5.

TheABSwarninglampilluminateswhiletheblinkcodeswitch

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 30-pin

connector).

Following a single display of all available messages, the

ABS warning lamp remains on for five 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

diagnosticsmode,the EC-30™controllerexitsthe blinkcode

diagnosticsand returns tothenormal operating mode.The

blinkcodediagnostics modecan onlybe activatedfollowing

apower-up, wherewheel speeds havenot beendetected.

Display Active Fault Codes

To display active fault codes, press the blink code switch

onetime. Following activation, therewill be athree second

delay, followed by a blink code display of all active fault

codes. See chart 7 for fault code definitions.

Display Fault Code History

To display history fault codes, press the blink code switch

twotimes. Followingactivation,therewill bea threesecond

delay, followed by a blink code display of all history fault

codes. See chart 7 for fault code definitions.

Reset Active Fault Codes

Toresetactive faultcodes, pressthe blinkcodeswitch 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)

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 definitions.

Resettingactivefaultcodeswith blinkcodediagnosticsdoes

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 Configuration

Tocheckthe ECUconfiguration, pressthe blinkcodeswitch

fourtimes. Followingactivation, therewillbe athreesecond

delay, followed by a blink code display of the EC-30™

controllerconfiguration. See chart 6.

CHART 5 - BLINK CODE ACTIVATION

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 Configuration

CHART 6 - BLINK CODES FOR EC-30™CONTROLLER

CONFIGURATION

1st Digit Sensors

2 4 Sensors

3 6 Sensors

2ndDigit Modulators

2 4 Modulators

3rdDigit ATC

2 NotATC

3 ATC Engine Torque Limiting Only

4 ATC Differential Brake Only

5 Full ATC (Engine Torque Limiting

and Differential Braking)

CHART 7 - EC-30™CONTROLLER BLINK CODE DEFINITIONS (1 of 3)

CHART 7 - EC-30™CONTROLLER BLINK CODE DEFINITIONS (2 of 3)

Sensoroutputlowormissingduringvehicleoperationabove10mph.Verify

condition of tone ring mounting. Adjust speed sensor to contact tone ring.

Rotatewheelandverify:(a)forWS-20speedsensorthatoutputisminimally

0.8VAC@1RPSor(b)forWS-24speedsensorthatoutputisminimally0.250

VAC@0.5RPS. Verifyconditionandretentionforceofsensorclips.Verify

propersensorleadroutingandclamping.

Sensoroutputintermittentorexcessivewobbleinexciterring.Verifycondition

oftoneringmountingandteeth. Verifyproperadjustmentofwheelbearings.

Adjustspeedsensortocontacttonering.Rotatewheelandverify:(a)forWS-

20speedsensorthatoutputisminimally0.8VAC@1RPSor(b)forWS-24

speedsensorthatoutputisminimally0.250VAC@0.5RPS. Verifycondition

and retention force of sensor clips. Verify proper sensor lead routing and

clamping.

Adjustspeedsensortocontacttonering.Verifyproper numberoftonering

teethpersensedwheel. Rotatewheelandverify:(a)forWS-20speedsensor

thatoutputisminimally0.8VAC@1RPSor(b)forWS-24speedsensorthat

outputisminimally0.250VAC@0.5RPS. Verifyconditionandretentionforce

ofsensorclips.Verifypropersensorleadroutingandclamping. Verifycondition

oftoneringmountingandteeth.