BENDIX MC-12 MODULATOR CONTROLLER ASSY Manual page 17

START HERE FROM
SECTION VI PART A
EC-12 ™ CONTROLLER WIRE
HARNESS CONNECTOR
M -SNS 2
L-SNS 2
A B C D E F G H J K L M N P
TESTING SPEED SENSOR RESISTANCE
MAGNET HERE
RESETTING
™
EC-12
Troubleshooting
SECTION VI PART B
TESTING THE WHEEL SPEED SENSOR
IGNITION OFF SERVICE BRAKES NOT APPLIED. REMOVE 14
PIN CONNECTOR FROM EC-12
RESISTANCE BETWEEN SPEED SENSOR PINS M & L AND N & P ON
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.
N-SNS 1
P-SNS 1
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
RECONNECT CONNECTOR AT SPEED
SENSOR AND EC-12
PASS MAGNET OVER "RESET" ON EC-12
CONTROLLER. REMOVE MAGNET AND
CONTROLLER
ARE SAME RED LEDS ILLUMINATED ?
SAME LED's ILLUMINATED?
YES
™ CONTROLLER. MEASURE
CORRECT RESISTANCE?
NO
® WS-20 ™ SPEED SENSOR
YES
™ CONTROLLER.
OBSERVE LEDs
ARE ANY LED's ILLUMINATED?
YES
YES
REPAIR OR REPLACE SPEED
SENSOR WIRING HARNESS
AND REPEAT THE "INITIAL
START-UP PROCEDURE".
NO
GO TO SECTION III "INSPEC-
TION FOR ILLUMINATED LED's"
YES
REPLACE THE EC-12
CONTROLLER
NO
REPLACE THE SENSOR
™
NO
REPEAT THE "INITIAL
START-UP PROCEDURE".
NO
GO TO SECTION III "INSPECTION
FOR ILLUMINATED LED's"
™
17