General Information

4WD Control
U0122 Lost Communication With Vehicle Dynamics Control Module - General Information

Component Location





General Description

CAN communication is a parallel circuit to interchange information among each units. CAN communication can share much information with units more faster and more efficiently by using specified language. CAN-High line is twisted with CAN-Low line as a purpose in preventing from a noise. The operating duty of EMC is maintained at 100 : 0 (2WD) for guaranteeing stabilized driving force, accuracy of the control during inside ABS, FTCS, ESP control.






DTC Description

This code related to communication line between HECU(ABS) and "4WD-ECM" is set when CAN signal from HECU(ABS) can't received for more than 1sec or ECU internal error occur. If failure is detected "4WD-ECM" prohibits the "ITCC" control and cuts the current to control coil.

DTC Detecting Condition





Diagnostic Circuit





Signal Waveform




FIG.1) CAN Signal : high & low