Bendix Commercial Vehicle Systems EC-17 ANTILOCK TRACTION CONTROL4/10 - Manual (Page 23)

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?