General Information

4WD Control
P1728 EMC-Open or Short to Battery - General Information

Component Location





General Description

Vehicle uses 2WD(2 wheel drive) for driving at normal speed, but sometimes it uses 4WD ECM(= TCCU : Transfer Case Control Unit) accordign to driving condition. (cornering or acceleration)
EMC(=Electric Magnetic Valve Clutch) distributes proper torque to front wheel by controling amount of current inside EMC coil.That time power pressing the multi plate clutch by apply cam is changed by a rate of EMC duty. after multi plate clutch start slip the force for acceletion at front/rear wheel is controlled at a range of 100:0 - 50 : 50.
ITM system has 4WD-LOCK function that can make driving force to 50:50 by compulsion according to driver's intention.

DTC Description

If there is an open or short in the EMC circuit, the 4WD ECM sets this DTC related to EMC coil.

DTC Detecting Condition





Dignostic Circuit Diagram





Signal Waveform & Data




Fig.1) EMC Signal : Throttle Valve Open