Bendix Commercial Vehicle Systems EC-13 TRAILER ANTILOCK CONTROL 8/07 - Manual (Page 18)

18
Troubleshooting
SECTION VI PART B
TESTING THE WHEEL SPEED SENSOR
REPEAT THE “INITIAL
START-UP PROCEDURE”.
REPLACE THE EC-13 ™
CONTROLLER
YES
ARE ANY LED’s ILLUMINATED?
YES
ARE SAME RED LEDS ILLUMINATED?
YES
CORRECT RESISTANCE?
NO
DISCONNECT CONNECTOR AT SPEED SENSOR. INSPECT
THE CONNECTOR, THEN CHECK THE RESISTANCE
BETWEEN TWO PINS ON SENSOR. RESISTANCE BETWEEN
1500-2500 OHMS FOR THE BENDIX ® WS-20 ™ SENSOR
YES
REPLACE THE SENSOR
NO
NO
GO TO SECTION III “INSPECTION
FOR ILLUMINATED LED’s”
NO
RESETTING
EC-13 ™
CONTROLLER
MAGNET HERE
START HERE FROM
SECTION VI PART A GO TO SECTION III “INSPEC-
TION FOR ILLUMINATED LED’s”
SAME LED’s ILLUMINATED?
NO
YES
RECONNECT CONNECTOR AT
SPEED SENSOR AND EC-13 ™
CONTROLLER. PASS MAGNET
OVER “RESET” ON EC-13 ™
CONTROLLER. REMOVE MAGNET
AND OBSERVE LEDs
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. REFER TO VEHICLE MANUAL FOR THE RE-
SISTANCE VALUES IF OTHER THAN WS-20 ™ SENSOR IS IN USE.
REPAIR OR REPLACE SPEED
SENSOR WIRING HARNESS
AND REPEAT THE “INITIAL
START-UP PROCEDURE”.
3H
LFT. FRONT 3D
RT. REAR
3C
RT. REAR
3E
LFT. REAR
2C
LFT. REAR
EC-13 ™ CONTROLLER WIRE
HARNESS CONNECTOR
TESTING SPEED SENSOR
RESISTANCE
3K
RT. FRONT
3J
LFT. FRONT
2H
RT. FRONT