DaimlerChrysler LH New Yorker 1994 Electronic Service Manual
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Contents
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VEHICLE SPEED CONTROL SYSTEMCONTENTSpage pageCHECKING FOR DIAGNOSTIC TROUBLE CODE . 5DIAGNOSIS PROCEDURES . . . . . . . . . . . . . . . . . 2ELECTRICAL TEST: . . . . . . . . . . . . . . . . . . . . . . . 5ELECTRICAL TESTS AT POWERTRAINCONTROL MODULE . . . . . . . . . . . . . . . . . . . . . 6ELECTRICAL TESTS AT SERVO . . . . . . . . . . . . . 5GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1INOPERATIVE SYSTEM . . . . . . . . . . . . . . . . . . . . 2ROAD TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2SERVO UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8SERVO VACUUM TEST . . . . . . . . . . . . . . . . . . . . 8SPEED CONTROL RELAY TEST . . . . . . . . . . . . . 8SPEED CONTROL SWITCH REMOVAL . . . . . . . . 8SPEED CONTROL SWITCH TEST . . . . . . . . . . . . 7STOP LAMP/VEHICLE SPEED CONTROL SWITCHTEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7VACUUM SUPPLY TEST . . . . . . . . . . . . . . . . . . . 7GENERAL INFORMATIONThe speed control system is electronically controlledand vacuum operated. The electronic control is inte-grated into the powertrain control module, located onthe right side under the air cleaner. The controls arelocated on the steering wheel and consist of twoswitches. The ON and OFF, buttons are located onthe upper left side of the airbag module. TheRESUME/ACCEL and SET/COAST buttons are lo-cated on the upper right side of the airbag module(Fig. 1). For identification and location of the majorcomponents (Figs. 2 and 3).The system is designed to operate at speeds above35 mph (50 km/h).WARNING: THE USE OF SPEED CONTROL IS NOTRECOMMENDED WHEN DRIVING CONDITIONS DONOT PERMIT MAINTAINING A CONSTANT SPEED,SUCH AS IN HEAVY TRAFFIC OR ON ROADS THATARE WINDING, ICY, SNOW COVERED, OR SLIP-PERY.TO ACTIVATE: Press the ON button. The speedcontrol functions are now ready for use. The systemhas an AUTO-OFF feature which turns the system offwhenever the system looses power or the ignition isturned OFF. If this happens, the ON button must bepressed to activate the system.TO DEACTIVATE:• A soft tap of the brake pedal• Normal brake applicationWhile the system is engaged this will disengagespeed control without erasing the set speed inmemory. Pushing the OFF button or turning off theignition erases the set speed in memory.TO SET SPEED: When the vehicle has reachedthe desired speed push the SET/COAST button to en-Fig. 1 Speed Control SwitchFig. 2 Speed Control System—3.5L EngineVEHICLE SPEED CONTROL SYSTEM 8H - 1 |
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