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BENDIX EC-14 ANTILOCK CONTROLLER, Руководство пользователя

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21

TROUBLESHOOTING

SECTION VIII PART A

TESTING THE WHEEL SPEED SENSOR

Pass magnet over “RESET”

on EC-14

™

 controller. Remove

magnet and observe the LEDs

Are any red LEDs

illuminated?

NO

Go to Section VIII Part B

and begin testing

YES

Turn ignition off and check the following:

A.

Remove connector(s) from EC-14

™

 controller and measure resistance

between appropriate speed sensor signal (+) and signal return (-).
Resistance for Bendix

®

 WS-20

™

 speed sensor should be between 1500-

2500 ohms.  Refer to vehicle maintenance manual if other than the WS-20

™

speed sensor is in use.  If resistance not correct, disconnect connector at
speed sensor.  Inspect connector, then check resistance between pins on
sensor.  If resistance is not correct (between 1500-2500 ohms for the Bendix

®

WS-20

™

 speed sensor), replace sensor, otherwise proceed to step B.

B. Check “gap” between speed sensor and exciter or tone ring.  (Gap for Bendix

®

WS-20

™

 speed sender is between 0 - .015 inches.)  If sensor gap must be

adjusted, check for loose or worn wheel bearings before re-gapping sensor.
Refer to vehicle maintenance manual for worn bearings.

C. If sensor gap is correct check wheel bearing for free play to verify it complies

to manufacturer’s recommendations.

D. Make certain exciter or tone ring is in place and inspect condition.  Check for

missing or damaged teeth and that it runs true and perpendicular to sensor
face.

E. Check wiring harness and connectors that run to sensor.
F.

Check for dragging brakes (over-adjusted, trapped air in actuator, out-of-
round drums, faulty return springs, parking brake system faults, etc.) and
correct. Retest.

RESETTING

EC-14

™

 CONTROLLER

3C

RT. REAR

3D

RT. REAR

3H

LFT.

FRONT

3J

LFT. FRONT

2C

LFT. REAR

3E

LFT. REAR

3K

RT. FRONT

2H

RT. FRONT

Reconnect EC-14

™

 controller connector, turn

ignition on and pass magnet over “RESET” on

EC-14

™

 controller and remove. Observe LEDs

Are any red LEDs

illuminated?

Go to Section IV

“Inspection for Illuminated

Red LEDs” and retest

YES

NO

Repeat the “Initial Start-up

Procedure”

MAGNET

HERE

Testing Speed Sensor Resistance

EC-14

™

 Controller Wire Harness Connector

START HERE

Содержание EC-14 ANTILOCK CONTROLLER

Страница 1: ...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 pro...

Страница 2: ...2 FIGURE 2 MC 14 ANTILOCK BRAKE SYSTEM...

Страница 3: ...l speed information from various wheel speed sensor models at the rate of 100 pulses per wheel revolution The EC 14 controller is able to simultaneously receive and individually interpret speed signal...

Страница 4: ...ONNECTOR DEUTSCH 2 PIN CONNECTOR 90 WS 20 WHEEL SPEED SENSOR STRAIGHT WS 20 WHEEL SPEED SENSOR BRAKE DRUM SPEED SENSOR MOUNTING BLOCK 100 TOOTH SPEED SENSOR EXCITER RING WS 20 WHEEL SPEED SENSOR 90 DE...

Страница 5: ...eans of advising the driver of the condition of the antilock system A connection to the Engine or Transmission Retarder is provided on the EC 14 controller which allows the EC 14 controller to tempora...

Страница 6: ...NON ANTILOCK BRAKE APPLICATION During normal braking the brake valve simultaneously delivers air to the control port of the M 12 modulator on the rear axle s as well as to and through the M 21 or M 22...

Страница 7: ...rformed during this period Because no two vehicles operate under identical conditions maintenance and maintenance intervals will vary Experience is a valuable guide in determining the best maintenance...

Страница 8: ...8 FIGURE 6 MC 14 ANTILOCK WIRING SCHEMATIC...

Страница 9: ...tion of the MC 14 modulator controller assembly on the vehicle Loosen remove and save the nuts on the mounting hardware that attaches the MC 14 modulator controller bracket to the vehicle Remove the M...

Страница 10: ...DS There are nine LEDs plus a magnetically actuated reset switch in the EC 14 controller diagnostic window The first five LEDs locate a problem to a specific area of the trailer while the last four in...

Страница 11: ...during vehicle operation to indicate that vehicle power is reaching the controller If vehicle power is out of range for proper operation below 10 vdc or above 17 vdc this LED will flash until power is...

Страница 12: ...odulators Go to Section I Dash Lamp Testing YES YES NO Dash lamp remains on NO Go to Section III Inspection for illuminated LEDs YES NO The system is functioning normally Make notes of the parts repla...

Страница 13: ...on on measure voltage between lamp relay Pin 3F and ground Pins 1A 2A Voltage should be same as battery voltage Replace the EC 14 controller Go to Section II Inspection for Illuminated LEDs Check wiri...

Страница 14: ...nspection for Illuminated LEDs NO Record the condition of all red LEDs Go to Section IX Testing for False Failure Indication Caused by Dash Lamp Relay NO Go to Section V Testing for Power to the EC 14...

Страница 15: ...lluminated Go to Section IV Inspection for Illuminated LEDs Record the condition of all red LEDs Go to Section X Testing For False Failure Indication Caused by Wheel Speed Components NO Go to Section...

Страница 16: ...NO Is the red FRONT or REAR LED illuminated See Note 1 below Is the red FRONT or REAR LED illuminated See Note 1 below NO YES REAR LED FRONT LED Go to Section VII Testing the Rear Modulator ON ON ON...

Страница 17: ...een power and ground pins on wire harness connector 1A to 1K 1A to 2K 2A to 1 K 2A to 2 K Reconnect connector to EC 14 controller Check the vehicle wiring for continuity Refer to the vehicle service m...

Страница 18: ...o Power 2F to 1K 2K No Continuity Exhaust to Ground 2F to 1A 2A No Continuity NO Go to Section VI B and continue testing Are resistance values correct 1A 2A GROUND 2F EXHAUST 2G HOLD 1K 2K POWER 1G SO...

Страница 19: ...Test each pin to vehicle ground and note no continuity Are resistance values correct Replace the front M 21 modulator NO Reconnect connector to modulator Turn ignition on and pass magnet over RESET o...

Страница 20: ...NET HERE YES STARTHERE Turn the ignition off Separate the EC 14 controller from the M 12 modulator Disconnect the four pin connector between the two components and test resistance on the modulator con...

Страница 21: ...If sensor gap must be adjusted check for loose or worn wheel bearings before re gapping sensor Refer to vehicle maintenance manual for worn bearings C If sensor gap is correct check wheel bearing for...

Страница 22: ...esistance between two pins on sensor Is resistance between 1500 2500 Ohms for the Bendix WS 20 speed sensor NO Replace the sensor YES NO Reconnect connector at speed sensor and EC 14 controller Pass m...

Страница 23: ...mation Repair or replace as necessary and repeat the Initial Start up Procedure Repeat the Initial Start up Procedure If testing has returned to this step twice replace the EC 14 controller and retest...

Страница 24: ...onds or more Bring vehicle to a stop and turn off ignition Turn the ignition off Refer to Section VII Part A Testing the wheel sensor and perform tests and inspections B through F in the large box Rep...

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