User's Manual
24
SECTION VII A - TESTING THE WHEEL SPEED SENSOR
START HERE
IGNITION ON, NOTE ILLUMINATED LED’s.
DO MAGNETIC RESET, NOTE REACTION OF RED LEDs.
2nd TIME TO THIS POINT DURING TESTING?
GO TO SECTION VII PART B
AND BEGIN TESTING
YES
ANY RED LEDs ON?
SAME RED LEDs ON?
YES
NO
GO TO SECTION VII PART B
AND BEGIN TESTING
NO
NO
YES
GO TO SECTION IV.
RECONNECT CONNECTORS AT EC-16
™
CONTROLLER AND SPEED SENSOR, DO
MAGNETIC RESET. NOTE RED LEDs.
GO TO “INITIAL START-UP PROCEDURE”
YES
ARE ANY RED LEDs ILLUMINATED?
GO TO SECTION III “INSPECTION
FOR ILLUMINATED LEDs.”
NO
TURN IGNITION OFF AND CHECK FOLLOWING:
A. 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.
B. IF SENSOR GAP IS CORRECT CHECK WHEEL BEARING FOR
FREE PLAY TO VERIFY IT COMPLIES TO MANUFACTURER’S
RECOMMENDATIONS.
C. 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.
D. CHECK WIRING HARNESS AND CONNECTORS THAT RUN TO SENSOR.
E. 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.