User Guide

ManualsBrandsBendix ManualsOtherEC-13 TRAILER ANTILOCK CONTROL

SD-13-4783

Bendix

EC-13

™

Trailer AntiLock Controller Assembly

DESCRIPTION

GENERAL

Bendix trailer antilock systems utilizing the EC-13

™

electronic controller assembly provide AXLE braking control

for trailers. By controlling “wheel lock-up” during aggressive

braking, the trailer retains a high degree of stability and

steerability while braking, and vehicle stopping distance

may be reduced.

In order to provide AXLE control antilock, the EC-13

™

controller is used in combination with the following

components;

- Four, individual wheel speed sensors

- Two M-12R

™

remote mount modulator-relay valves

or a combination of one M-12

™

and one M-12R

™

modulator

PHYSICAL

The EC-13

™

controller assembly electronics, which regulate

the function of the antilock system, are contained in a die

cast aluminum housing and are environmentally protected

by silicone encapsulation. The metal housing, coupled with

the design of the digital electronics, is intended to provide

a high degree of protection from radio and electromagnetic

interference.

A diagnostics display window with 9 light emitting diodes

(LEDs) and a magnetically actuated reset switch is

incorporated in the housing for troubleshooting and

diagnostic purposes.

A single electrical connector is currently used on the

EC-13

™

controller, for connection to the antilock system

components; a 30 pin, Packard Electric, 150 series “Metri-

pack.”

MOUNTING

The EC-13

™

controller can be remote bracket mounted to a

frame member or can be mounted directly on a modulator-

relay valve assembly, such as the Bendix

M-12

™

modulator

(reference SD-13-4772). When the EC-13

™

controller is

mounted on a modulator assembly the resulting assembly

receives a different designation. For example when the

EC-13

™

antilock controller is mounted on the M-12

™

modulator the resulting assembly (i.e.; EC-13

™

controller

plus M-12

™

modulator) is known as a MC-13

™

modulator

controller (see Figure 3). When the EC-13

™

controller is

bracket mounted to a frame member, and not mounted

on the modulator, an M-12R

™

modulator is used. The

M-12R

™

modulator is identical to the M-12

™

modulator but

has remote mounting capabilities (see Figure 6).

DIAGNOSTIC

WINDOW

30 PIN WIRE HARNESS

CONNECTOR

EC-13

™

Trailer AntiLock Controller

FIGURE 1 - EC-13

™

TRAILER ANTILOCK CONTROLLER

MOUNTING HOLES (4)

Summary of content (20 pages)

PAGE 1
SD-13-4783 Bendix® EC-13™ Trailer AntiLock Controller Assembly MOUNTING HOLES (4) EC-13™ Trailer AntiLock Controller DIAGNOSTIC WINDOW 30 PIN WIRE HARNESS CONNECTOR FIGURE 1 - EC-13™ TRAILER ANTILOCK CONTROLLER DESCRIPTION GENERAL Bendix trailer antilock systems utilizing the EC-13 ™ electronic controller assembly provide AXLE braking control for trailers.
PAGE 2
SPRING BRAKE WS-20™ WHEEL SPEED SENSOR M-12R™ MODULATOR EC-13™ CONTROLLER CONTROL (SERVICE) LINE SR-5™ SPRING BRAKE VALVE Reservoir SUPPLY (EMERGENCY) LINE Reservoir M-12R™ MODULATOR TO TRAILER ELECTRICAL CONNECTOR TRAILER ANTILOCK WIRING HARNESS SPRING BRAKE 30 PIN CONTROLLER CONNECTOR WS-20™ WHEEL SPEED SENSOR FIGURE 2 - TYPICAL EC-13™ TRAILER ANTILOCK SYSTEM EC-13™ CONTROLLER INFORMATION INPUTS AND COMMAND OUTPUTS GENERAL The EC-13™ controller receives information from several components i
PAGE 3
OPERATION EC-13™ Controller OPERATIONAL PHILOSOPHY The Bendix® EC-13™ controller provides axle braking control by using four speed sensors and two modulators. By monitoring the rate of deceleration during braking, and subsequently adjusting the brake application pressure to each axle, the EC-13™ controller is able to provide improved braking while maintaining trailer stability.
PAGE 4
Solenoid valves contained in the modulator are energized and de-energized by the EC-13™ controller in order to modify the brake application. When a solenoid coil is energized its shuttle moves, and depending upon the function of the specific 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.
PAGE 5
FIGURE 5 - TYPICAL MC-13™ MODULATOR CONTROLLER TRAILER WIRING SCHEMATIC 5 RIGHT TURN LIGHTS (GRN) Typical Trailer Connector Terminal Allocation Terminal 1K & 2K 1A & 2A 3F 1G 2G 2F 1D 1C 1B 3J 3H 2H 3K 3E 2C 3D 3C 3A 3B M-12R™ Modulator 1 3 2 3 Trailer Wiring Harness Connector 3 1 WS-20™ Wheel Speed Sensor Wire Harness Connector Connection Battery Power (+) Stop Light Switch (to Trailer Electrical Trailer Ground Connector) Trailer Status Lamp Front Modulator Common Front Modulator Hold Front Mo
PAGE 6
EC-13™ Controller M-12R™ Modulator (Remote Mount) FIGURE 6 - EC-13™ CONTROLLER AND M-12R™ MODULATOR ASSEMBLY 3. Road test the trailer by making an antilock stop from a vehicle speed of 20 miles per hour. When an antilock stop is made, the modulator solenoids pulsate and an audible burst of air can be heard. The wheels should not enter a prolonged “lock” condition.
PAGE 7
Removing a Bracket Mounted Remote EC-13™ Controller: LED Indicators 1. Disconnect the electrical connector (on the vehicle wiring harness) from the EC-13™ controller. 2. Note and mark the mounting position of the EC-13™ controller assembly on the trailer. Loosen, remove and save the mounting hardware that attaches the EC-13™ controller bracket to the trailer. Remove the EC-13™ controller and bracket assembly from the trailer.
PAGE 8
NOTE: The MID LED shown in the chart on the previous page is not used in the diagnostic process for the EC-13™ controller however, it will light when a magnet is placed on the RESET switch in the diagnostic window. “FRONT” LED This red LED illuminates and latches ON in order to indicate the location of a problem component or its wiring. It will light in conjunction with either the RIGHT or LEFT LED and the SENS LED when indicating a speed sensor problem.
PAGE 9
IMPORTANT - TROUBLESHOOTING TIPS 1. Record all findings and the action taken during the troubleshooting process. The record sheet should be filed in the trailer maintenance folder for future reference and comparison. 2. No voltage or resistance tests are performed into the EC-13™ controller. All voltage and resistance tests are performed by beginning at the wire harness half of the connector and moving AWAY from the EC-13™ controller toward an antilock system component (modulator, wheel speed sensor, etc.
PAGE 10
TYPICAL LOCATIONS FOR AMBER STATUS LAMP Troubleshooting INITIAL START-UP PROCEDURE START HERE WITH TRAILER CONNECTED TO TRACTOR, TURN IGNITION ON, APPLY TRAILER SERVICE BRAKES AND OBSERVE STATUS LAMP MOUNTED ON TRAILER.
PAGE 11
Troubleshooting SECTION I TRAILER STATUS LAMP TESTING WITH TRACTOR IGNITION OFF, DISCONNECT 30 PIN WIRE HARNESS CONNECTOR FROM EC-13™ CONTROLLER THEN TURN TRACTOR IGNITION ON AND MAKE AND HOLD A BRAKE APPLICATION. START HERE USING A JUMPER WIRE CONNECT PIN 3F TO 1A AND/ OR 2A. WITH THE CONNECTION IN PLACE NOTE THE CONDITION OF TRAILER STATUS LAMP. GROUND 1A & 2A TRAILER STATUS LAMP 3F YES TRAILER STATUS LAMP ON? REPLACE EC-13™ CONTROLLER AND RETEST.
PAGE 12
Troubleshooting SECTION II INSPECTION FOR ILLUMINATED LED’s WITH TRACTOR IGNITION ON AND BRAKES HELD APPLIED, INSPECT EC-13™ CONTROLLER FOR PRESENCE OF ILLUMINATED LEDS AND RECORD. START HERE NO IS GREEN, VOLT, LED ILLUMINATED? CHECKING “VOLT” LED YES ARE ANY RED LED’s ILLUMINATED? NO GO TO SECTION IV “TESTING FOR POWER TO THE EC-13™ CONTROLLER”. YES ON? FLASHING? REPLACE THE EC-13™ CONTROLLER GO TO SECTION IV “TESTING FOR POWER TO THE EC-13™ CONTROLLER”.
PAGE 13
Troubleshooting SECTION III INSPECTION FOR ILLUMINATED LEDS NOTE RED “ECU” LED IN EC-13™ CONTROLLER DIAGNOSTICS WINDOW. START HERE INSPECTING “ECU” LED GO TO SECTION IV “TESTING FOR POWER TO THE EC-13™ CONTROLLER”.
PAGE 14
Troubleshooting SECTION IV TESTING FOR POWER TO THE EC-13™ CONTROLLER START HERE WIRE HARNESS CONNECTOR TURN IGNITION OFF, DISCONNECT WIRE HARNESS CONNECTOR FROM EC-13™ CONTROLLER TURN IGNITION ON, MAKE & HOLD A BRAKE APPLICATION AND, MEASURE VOLTAGE BETWEEN POWER AND GROUND PINS ON WIRE HARNESS CONNECTOR 1A TO 1K 1A TO 2K 2A TO 1K 2A TO 2K RECONNECT CONNECTOR TO EC-13™ 1A, 2A GROUND 1K, 2K POWER VOLTAGE SAME AS BATTERY VOLTAGE? MUST BE BETWEEN 8 AND 17 VOLTS. YES NO CONTROLLER.
PAGE 15
Troubleshooting SECTION V PART A TESTING THE MODULATOR TURN IGNITION OFF. DISCONNECT 30 PIN WIRE HARNESS CONNECTOR FROM EC-13™ CONTROLLER. START HERE WIRE HARNESS CONNECTOR PROBE CONNECTOR WITH VOLT/OHM METER AND NOTE THAT PROPER RESISTANCE VALUES ARE OBTAINED FOR MODULATOR BEING TESTED. RESISTANCE VALUES HERE FOR A BENDIX® M-12™ MODULATOR.
PAGE 16
Troubleshooting SECTION V PART B TESTING THE MODULATOR TURN THE IGNITION OFF. DISCONNECT THE MODULATOR (M-12™ OR M-12R™) CONNECTOR FROM THE VEHICLE WIRE HARNESS TO EXPOSE THE THREE PIN CONNECTOR LEADING TO THE M-12™ MODULATOR AND TEST RESISTANCE BETWEEN THE PINS ON THE MODULATOR CONNECTOR.
PAGE 17
Troubleshooting SECTION VI PART A TESTING THE WHEEL SPEED SENSOR START HERE PASS MAGNET OVER “RESET” ON EC-13™ CONTROLLER. REMOVE MAGNET AND OBSERVE THE LEDs. YES ANY RED LED’s ON? RESETTING EC-13™ CONTROLLER NO TURN IGNITION OFF AND CHECK FOLLOWING: MAGNET HERE EC-13™ CONTROLLER WIRE HARNESS CONNECTOR 3C RT. REAR 3H 3D RT. REAR LFT. FRONT 3J LFT. FRONT 3K RT. FRONT 2H RT. FRONT 2C LFT. REAR GO TO SECTION VI PART B AND BEGIN TESTING 3E LFT. REAR TESTING SPEED SENSOR RESISTANCE A.
PAGE 18
Troubleshooting SECTION VI PART B TESTING THE WHEEL SPEED SENSOR NO START HERE FROM SECTION VI PART A GO TO SECTION III “INSPECTION FOR ILLUMINATED LED’s” SAME LED’s ILLUMINATED? YES EC-13™ CONTROLLER WIRE HARNESS CONNECTOR 3C RT. REAR 3D 3H RT. REAR LFT. FRONT IGNITION OFF. REMOVE 30 PIN CONNECTOR FROM EC-13™ CONTROLLER. MEASURE RESISTANCE BETWEEN THE APPROPRIATE SPEED SIGNAL PINS ON THE CONNECTOR. RESISTANCE FOR BENDIX® WS-20™ SENSOR IS BETWEEN 1500-2500 OHMS.
PAGE 19