Bendix-commercial-vehicle-systems MC-11 TRACTOR ANTILOCK 4/04 User Manual

1®Bendix® MC-11™ Tractor AntiLockSD-13-4761FIGURE 1LED DIAGNOSTICDISPLAY14-PINCONNECTORM-12™MODULATORDELIVERYDELIVERYSUPPLYCONTROLEC-11™CONTROLLERDESC

10TIPS1. All troubleshooting should begin by performing the“STARTUP,” which focuses on observing the antilockstatus light on the dash.2. The troublesh

11TURN VEHICLE IGNITION ON.OBSERVE AMBER DASH LIGHT.DASH LIGHTNOT ONDASH LAMP DOES NOTBLINK, IT COMES ONAND REMAINS ON.DASH LIGHT FLASHESTWICE AND STA

12DISCONNECT 14 PIN CONNECTOR FROMEC-11™ CONTROLLER OBSERVE DASH LIGHTREPEATSTARTUPWITH IGNITION ON, MEASURE VOLTAGEBETWEEN DASH LIGHT RELAY (PIN D)AN

13INSPECT EC-11™ CONTROLLERFOR ILLUMINATED LED(S)NOTE ILLUMINATEDLED(S) AND GO TOSECTION III-INSPECTION FORILLUMINATED REDLED(S)GO TO SECTIONVII - FAL

14INSPECT EC-15™ CONTROLLER FOR PRESENCEOF ILLUMINATED LEDS AND RECORD.VOLTAGE LED ILLU-MINATES WHEN POWERTO EC-11™ CONTROLLERFALLS OUTSIDE 9-18VOLT R

15IS THE GREEN (PWR)LED ON?MAY HAVE ANINTERMITTENT FAILURE.CHECK VEHICLEELECTRICAL SPIKES ORTRANSIENT VOLTAGETURN IGNITION ON.MEASURE VOLTAGEBETWEEN P

16RECORD INDICATEDFAILURE. PERFORMA RESET.DISCONNECT THE 4-PINCONNECTOR BETWEEN THEEC-11™ CONTROLLER AND THEM-12™ MODULATOR SOLENOIDASSEMBLY. CHECK RE

17RECORD INDICATEDFAILUREMEASURE RESISTANCE ATTHE PROPER PINLOCATIONS ON THE 14-PINCONNECTOR.(“SNS 1” - PINS N AND P.“SNS 2” - PINS L AND M.)GO TO SEC

18RESISTANCE OUTSIDE1500-2500 OHMSCHECK WIRING THATLEADS TO SENSORFOR INTERMITTENTCONNECTIONS ANDCONTINUITY. REPAIR/REPLACE ASNECESSARY.DISCONNECT SEN

19HOLD A MAGNET TO THE RESET SWITCH AND MAKE SUREALL LEDS ILLUMINATE WHEN MAGNET IS PRESENTREPEAT STARTUP, IF TESTINGRETURNS TO THIS PLACE TWICE,REPLA

2EXH. BLK. PWRFIGURE 2 - TYPICAL MC-11™ TRACTOR ANTILOCK WIRING SCHEMATICEXH. BLK. GRDPOWERDASH LIGHTSENSORGROUNDSERIAL LINK14-PINCONNECTORSENSORRETA

20HOLD A MAGNET TO THE RESET SWITCH ANDMAKE SURE ALL LEDS ILLUMINATE WHENMAGNET IS PRESENTREPEAT STARTUP, IFTESTING RETURNS TO THISPLACE TWICE, REPLAC

3FIGURE 3 - APPLYING: NORMAL SERVICE APPLICATIONINLET SOLENOIDRESERVOIRDOUBLECHECK VALVEEXHAUSTSUPPLYEXHAUSTSOLENOIDThe wiring connections on the 14 p

4which passes through the open inlet solenoid and into thecontrol cavity of the relay valve. The valve then applies air tothe service brake chambers i

51. Remove any accumulated contaminants and visuallyinspect the exterior of the unit for excessive corrosion orphysical damage.2. Inspect all air line

63. With the brake application held and a technician nearthe modulator, turn the vehicle ignition key to the ONposition. One short burst of air should

7REMOVAL OF THE MC-11™ ASSEMBLY1. Prior to disassembly, remove as much contaminationas possible from the exterior of the assembly. Be sureto keep the

81CAP SCREW724563891011121314FIGURE 7 - EXPLODED VIEW

96. Install o-ring(5) into its groove in the piston(6). Installpiston(6) into the M-12™ modulator body. The piston stemfits into the small hole in the