Bendix Commercial Vehicle Systems EC-17 ANTILOCK TRACTION CONTROL4/10 - Manual (Page 24)

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SECTION VI B - TESTING THE MODULATOR
GO TO MODULATOR, INSPECT WIRING CONNECTOR.
DISCONNECT CONNECTOR AND TEST RESISTANCE
BETWEEN PINS ON MODULATOR.
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
RESISTANCE VALUES 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
TEST EACH PIN TO VEHICLE GROUND WITH A MEG-
OHMMETER AND NOTE THAT NO CONTINUITY EXISTS.
EXHAUST COMMON HOLD
A B C
CONNECTOR ON M-21 ™ OR M-22 ™
MODULATOR.
START HERE FROM
SECTION VI A
REPLACE THE MODULATOR.
YES
REPEAT THE “INITIAL
START-UP PROCEDURE”
REPAIR OR REPLACE MODU-
LATOR WIRE HARNESS.
GO TO SECTION IV “INSPECTION FOR
ILLUMINATED LEDs” AND RETEST.
NO
YES
YES
NO
NO
RECONNECT CONNECTOR TO MODULATOR.
TURN IGNITION ON AND PASS MAGNET OVER
RESET ON EC-17 ™ CONTROLLER. NOTE
REACTION OF RED LEDs.
RESISTANCE READINGS
CORRECT?
ARE ANY RED LEDs
ILLUMINATED?
SAME RED LEDs
ILLUMINATED?