Bendix Commercial Vehicle Systems EC-13 TRAILER ANTILOCK CONTROL 8/07 - Manual (Page 17)

17
Troubleshooting
SECTION VI PART A
TESTING THE WHEEL SPEED SENSOR
START HERE
TURN IGNITION OFF AND CHECK FOLLOWING:
A. REMOVE CONNECTOR(S) FROM EC-13 ™ 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
™ 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 ™ 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 AND RETEST.
TESTING SPEED SENSOR RESISTANCE
REPEAT THE “INITIAL START-UP
PROCEDURE
ARE ANY RED LEDs
ILLUMINATED?
GO TO SECTION III - “INSPECTION
FOR ILLUMINATED LEDs”
NO
YES
GO TO SECTION VI PART B
AND BEGIN TESTING
ANY RED LED’s ON?
NO
RESETTING
EC-13 ™
CONTROLLER
MAGNET HERE
PASS MAGNET OVER “RESET” ON
EC-13 ™ CONTROLLER. REMOVE
MAGNET AND OBSERVE THE LEDs.
RECONNECT EC-13 ™ CONTROLLER,
TURN IGNITION ON. PASS MAGNET OVER
“RESET” ON EC-13 ™ CONTROLLER.
REMOVE MAGNET AND OBSERVE LEDs
YES
3H
LFT. FRONT 3D
RT. REAR
3C
RT. REAR
3E
LFT. REAR
2C
LFT. REAR
EC-13 ™ CONTROLLER WIRE
HARNESS CONNECTOR
2H
RT. FRONT
3J
LFT. FRONT
3K
RT. FRONT
RESETTING
EC-13 ™
CONTROLLER
MAGNET HERE