Bendix Commercial Vehicle Systems EC-15 ANTILOCK CONTROLLER ASSY 4/08 - Manual (Page 20)

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GO TO MODULATOR, INSPECT WIRING CONNECTOR.
DISCONNECT CONNECTOR AND TEST RESISTANCE
BETWEEN PINS ON MODULATOR, RESISTANCE VALUES
FOR BENDIX
® M-21 ™ MODULATOR (FIGURE 5).
HOLD TO SOURCE: READ 3.5 TO 5 OHMS
EXHAUST TO SOURCE: READ 3.5 TO 5 OHMS
EXHAUST TO HOLD: READ 7 TO 10 OHMS
TEST EACH PIN TO VEHICLE GROUND AND NOTE NO
CONTINUITY.
RECONNECT CONNECTOR TO MODULATOR.
TURN IGNITION ON AND PASS MAGNET OVER
RESET ON EC-15
™ CONTROLLER. NOTE
REACTION OF RED LEDS.
ARE ANY RED LED’S
ILLUMINATED?
RESISTANCE READINGS
CORRECT?
START HERE FROM
SECTION VI A
REPLACE THE MODULATOR
NO
YES
GO TO SECTION IV “INSPECTION FOR
ILLUMINATED LEDS” AND RETEST.
REPAIR OR REPLACE
MODULATOR WIRE HARNESS.
SAME RED LED’S
ILLUMINATED?
REPEAT THE “INITIAL
START-UP PROCEDURE”
TROUBLESHOOTING
SECTION VI B - TESTING THE MODULATOR
NO
YES
NO
YES