23
SECTION VI A - TESTING THE MODULATOR
F E D
C B A
1
2
3
K J H G F
E D C B A
H1
LEFT FRONT MOD. COMMON
F1
LEFT FRONT MOD. EXHAUST
G1
LEFT FRONT MOD. HOLD
C1
RIGHT FRONT MOD. COMMON
E1
RIGHT FRONT MOD. EXHAUST
D1
RIGHT FRONT MOD. HOLD
F1
LEFT REAR MOD. COMMON
D1
LEFT REAR MOD. EXHAUST
E1
LEFT REAR MOD. HOLD
A1
RIGHT REAR MOD. COMMON
C1
RIGHT REAR MOD. EXHAUST
B1
RIGHT REAR MOD. HOLD
1
2
3
18 PIN CONNECTOR
30 PIN CONNECTOR
TURN IGNITION OFF. REFER TO
ILLUSTRATION, DISCONNECT WIRE
HARNESS CONNECTOR FROM
EC-17
™
CONTROLLER.
START HERE
PROBE CONNECTOR WITH VOLT/OHM METER AND NOTE
THAT PROPER RESISTANCE VALUES ARE OBTAINED FOR
MODULATOR BEING TESTED.
RESISTANCE VALUES FOR BENDIX
®
M-21
™
AND
M-22
™
MODULATORS.
HOLD TO COMMON:
READ 3.5 TO 5 OHMS
EXHAUST TO COMMON:
READ 3.5 TO 5 OHMS
EXHAUST TO HOLD:
READ 7 TO 10 OHMS
FOR BENDIX
®
M-32
™
MODULATORS.
HOLD TO COMMON:
READ 4.9 TO 7 OHMS
EXHAUST TO COMMON:
READ 4.9 TO 7 OHMS
EXHAUST TO HOLD:
READ 9.8 TO 14 OHMS
PROBE CONNECTOR PINS WITH A MEGOHMMETER AND
VERIFY THAT NO CONTINUITY EXISTS.
COMMON TO GROUND:
NO CONTINUITY
HOLD TO GROUND
NO CONTINUITY
EXHAUST TO GROUND
NO CONTINUITY
INSPECT CONNECTOR AND RECONNECT
TO EC-17
™
CONTROLLER. TURN IGNITION
ON AND PASS MAGNET OVER RESET ON
EC-17
™
CONTROLLER. NOTE REACTION
OF RED LEDs.
SAME RED LEDs
ILLUMINATED?
REPEAT “INITIAL START-UP
PROCEDURE.” IF THIS TEST STEP
HAS REPEATED TWICE - REPLACE
THE EC-17
™
CONTROLLER.
NO
YES
YES
NO
GO TO SECTION VI B AND
CONTINUE TESTING
NO
YES
REPLACE THE EC-17
™
CONTROLLER.
GO TO SECTION IV
“INSPECTION FOR
ILLUMINATED LEDs”
AND RETEST.
ARE RESISTANCE
VALUES CORRECT?
ARE ANY RED LEDs
ILLUMINATED?
