Bendix Commercial Vehicle Systems MC-12 MODULATOR CONTROLLER ASSY - Manual (Page 15)

15
Troubleshooting
SECTION V
TESTING THE MODULATOR
SAME RED LED's
ILLUMINATED?
NO
YES
YES
ARE ANY RED LED's
ILLUMINATED?
INSPECT CONNECTOR AND RECONNECT TO
EC-12 ™ CONTROLLER. TURN IGNITION ON &
APPLY & HOLD BRAKES ON. PASS
MAGNET OVER "RESET" ON EC-12 ™
CONTROLLER. REMOVE MAGNET AND
NOTE REACTION OF RED LEDS.
ARE RESISTANCE
VALUES CORRECT?
YES
REPEAT “INITIAL START-UP PROCEDURE”.
IF TESTING HAS RETURNED
TO THIS STEP TWICE - REPLACE THE
EC-12 ™ CONTROLLER.
REPLACE EC-12 ™
CONTROLLER
NO
GO TO SECTION III
“INSPECTION FOR
ILLUMINATED LEDS”
AND RETEST.
IF FAILURE PERSISTS,
REPLACE THE EC-12 ™
CONTROLLER.
WHITE BLACK
WHITE BLACK
M-12 ™ MODULATOR
4 PIN CONNECTOR
START HERE
MAGNET HERE
RESETTING
EC-12 ™ CONTROLLER
REPLACE
M-12 ™ MODULATOR
NO
TURN IGNITION OFF AND DO NOT APPLY BRAKES.
SEPARATE EC-12 ™ CONTROLLER FROM THE M-12 ™
MODULATOR. DISCONNECT 4 PIN CONNECTOR
BETWEEN M-12 ™ MODULATOR & EC-12 ™
CONTROLLER AND TEST RESISTANCE ON THE
MODULATOR CONNECTOR
BLACK to BLACK READ 9 to 12 OHMS
WHITE to WHITE READ 9 to 12 OHMS