BENDIX EC-13 TRAILER ANTILOCK CONTROL Manuel - Page 4

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BENDIX EC-13 TRAILER ANTILOCK CONTROL Manuel

Solenoid valves contained in the modulator are energized

and de-energized by the EC-13

modify the brake application. When a solenoid coil is

energized its shuttle moves, and depending upon the

function of the speciﬁ c solenoid, it either opens or closes,

thereby causing the exhaust or re-application of air

pressure to the relay valve portion of the modulator and to

the brake actuators connected. The solenoids in either the

M-12

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or M-12R

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modulator are controlled independently

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by the EC-13

controller. By opening and closing the

solenoid valves in the appropriate modulator, the EC-13

controller is actually simulating what the driver does when

he "pumps" the brakes.

It must be remembered however that unlike the driver, the

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EC-13

controller is able to "pump" brakes on either the

front or rear axle(s), or both, independently and with far

greater speed and accuracy.

ANTILOCK SYSTEM OPERATION -

COMPONENT PROBLEM

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The Bendix

EC-13

problems using a conservative fail-safe philosophy. Any

single electrical problem in a component devoted to antilock

braking, results in simultaneous illumination of the antilock

condition lamp and a troubleshooting LED on the EC-13

controller. Depending upon the type of problem and its

position of occurrence the EC-13

antilock function at a lower performance level, disable all of

the antilock on the trailer or only a portion. When antilock

is disabled, the brakes on the affected axle(s) revert to

standard air braking.

System Parts Still Operating ( Yes / No )

Problem

Location

Lead Axle Rt. Sensor

Lead Axle Lft. Sensor

Rear Axle Rt. Sensor

Rear Axle Lft. Sensor

Lead Axle Modulator

Rear Axle Modulator

Controller

Voltage *

* If electrical power is below or above the 7 to 18 volt operating

range the ABS will stop operating. If voltage returns to the 8-17

volt range the ABS is restored.

A problem in a single speed sensor will not result in

disabling of the antilock system. If a speed sensor problem

is detected by the EC-13

sensor on the axle will be used to continue antilock

operation on the axle but at a slightly degraded level of

performance.

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controller in order to

controller handles equipment

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controller can continue

ABS Lead

ABS Rear

Axle

Yes

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controller, the remaining speed

With the failed component approach described, the antilock

system will attempt to provide the trailer with the best

possible braking and stability even after a problem has

occurred. It should be remembered that the driver will be

advised of any degraded antilock operation via the condition

lamp and that standard air braking will still be available on

those brakes where the antilock has been disabled.

ANTILOCK WIRING

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GENERAL NOTES

The wires that carry information and power into and out of

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the EC-13

controller are grouped and terminate at a 30 pin

Packard connector which plugs into the EC-13

The wiring harnesses and connectors are weather proof

and the wires that enter the connector are sealed to the

connector. The wire gauge used in the wire harnesses is

speciﬁ c to the task performed.

When diagnosing wiring in the antilock system the following

general rules apply and should be followed where applicable:

1. It is generally advisable to replace a wire harness rather

than repair individual wires in the harness. If a splice

repair must be made, it is important that the splice be

properly soldered with a rosin ﬂ ux (not acid based) and

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the splice made water proof.

2. Do not pierce wire insulation when checking for

continuity. Check for power, ground or continuity by

disconnecting the connector and testing the individual

pins or sockets in the connector(s). Do not overstress

sockets.

3. Always check the vehicle hand book for wire and

connector identiﬁ cation. Individual wire identiﬁ cation

will differ depending upon the type of connectors in

use, the trailer manufacturer, and the system features

in use.

4. While the serial link connections (2 total) are present

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on all EC-13

controllers they are not always used. In

addition several connector openings are not used.

PREVENTATIVE MAINTENANCE

Every 3 months; 25,000 miles; or 900 operating hours:

1. Check all wiring and connectors to ensure they are

secure and free from visible damage.

2. Although the EC-13

check diagnostics, the LED display should be inspected

to ensure that they are functional. With the tractor

ignition on and a brake application held applied, hold

a magnet (800 gauss; capable of picking up 3 ounces)

on the diagnostic window reset switch and note all of

the LEDs illuminate. If one or more of the LEDs DO

NOT ILLUMINATE and the antilock condition lamp on

the trailer indicates the system is functioning properly,

the non-illuminated LED(s) should be noted for future

reference. Although the diagnostic capabilities will

be limited, the system will continue to function as

designed.

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controller.

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controller incorporates a self