Bendix Commercial Vehicle Systems MC-12 MODULATOR CONTROLLER ASSY - Manual (Page 14)

14
Troubleshooting
SECTION IV
TESTING FOR POWER TO THE EC-12 ™ CONTROLLER
TURN IGNITION OFF, DISCONNECT 14 PIN
WIRE HARNESS CONNECTOR FROM EC-12
™
CONTROLLER
START HERE
VOLTAGE SAME AS BATTERY
VOLTAGE? MUST BE
BETWEEN 8 AND 17 VOLTS.
RECONNECT CONNECTOR TO EC-12 ™
CONTROLLER. CHECK THE VEHICLE
WIRING FOR CONTINUITY. REFER TO THE
VEHICLE SERVICE MANUAL AND CHECK
THE BATTERY VOLTAGE. REPAIR OR
REPLACE AS NECESSARY AND REPEAT
THE "INITIAL START-UP PROCEDURE"
YES
NO
MAGNET HERE
PERFORM A MAGNETIC RESET BY
PASSING A MAGNET OVER THE
"RESET" IN EC-12 ™ CONTROLLER
DIAGNOSTIC WINDOW THEN
REMOVE MAGNET
TURN IGNITION OFF, (DO NOT APPLY BRAKES)
RECONNECT WIRE HARNESS TO EC-12 ™ CONTROLLER.
TURN IGNITION ON & APPLY & HOLD BRAKES ON.
IS THE RED, "VOLT" LED
STILL ILLUMINATED?
TURN IGNITION ON, MAKE & HOLD A BRAKE
APPLICATION AND, MEASURE VOLTAGE
BETWEEN POWER AND GROUND PINS ON
WIRE HARNESS CONNECTOR
A to C
B to C
RESETTING
EC-12 ™
CONTROLLER
CHECKING "VOLT"
LED
ON?
ON ?
REPLACE EC-12 ™
CONTROLLER
REPEAT THE
“INITIAL START-UP
PROCEDURE”.
YES
NO
A B C D E F G H J K L M N P
POWER A & B GROUND C
EC-12 ™ CONTROLLER
WIRE HARNESS CONNECTOR