Bendix Commercial Vehicle Systems EC-14 ANTILOCK CONTROLLER 5/04 - Manual (Page 19)

19
TROUBLESHOOTING
SECTION VI B
TESTING FOR THE FRONT MODULATOR
START HERE
from Section VI A
Go to modulator, inspect wiring connector. Disconnect
connector and test resistance between pins on modulator.
Resistance values here for Bendix ® M-21 ™ modulator.
Hold to Source (C to B): ......................... Read 3.5 to 5 Ohms
Exhaust to Source (A to B): .................... Read 3.5 to 5 Ohms
Exhaust to Hold (A to C): ........................ Read 7 to 10 Ohms
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” on EC-14 ™
controller and remove. Note reaction of red LEDs
Are any red LEDs
illuminated?
Repeat the “Initial Start-up
Procedure”
Are same red LEDs
illuminated?
YES
NO
Go to Section IV
“Inspection for Illuminated
red LEDs” and retest
YES
Repair or replace
modulator wire harness
C
HOLD
A
EXHAUST
B
SOURCE
NO
RESETTING
EC-14 ™ CONTROLLER
MAGNET
HERE
YES
Connector on M-21 ™
Front Modulator