Bendix Commercial Vehicle Systems EC-14 ANTILOCK CONTROLLER 5/04 - Manual (Page 22)

22
TROUBLESHOOTING
SECTION VIII PART B
TESTING THE WHEEL SPEED SENSOR
Is the resistance correct?
Same LEDs illuminated?
Ignition off. Remove connector from EC-14 ™ controller.
Measure resistance between the appropriate speed
signal pins on the connector. Resistance for Bendix ®
WS-20 ™ speed sensor is between 1500-2500 Ohms.
Refer to vehicle manual for the resistance values if
other than WS-20 ™ speed sensor is in use.
Go to Section IV “Inspection
for Illuminated LEDs”
YES
Disconnect connector at speed sensor.
Inspect the connector, then check the
resistance 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 magnet over “RESET” on
EC-14 ™ controller. Remove magnet and observe LEDs
Are any LEDs illuminated? Repeat the “Initial Start-up
Procedure”
Repeat the “Initial Start-up
Procedure”
YES
NO
NO
YES
Are same red LEDs illuminated?
NO
Repair or replace the speed
sensor wiring harness
3H
LFT.
FRONT
3J
LFT. FRONT
3D
RT. REAR
3C
RT. REAR
2H
RT. FRONT
3K
RT. FRONT
3E
LFT. REAR
2C
LFT. REAR
Testing Speed Sensor Resistance
EC-14 ™ Controller Wire Harness Connector
RESETTING
EC-14 ™ CONTROLLER
MAGNET
HERE
YES
Replace the EC-14 ™ controller
START HERE
from Section VIII A