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.
ITM-ECU performs active control by sharing signals of engine RPM, APS, shift position, torque reduction.
This code related to communication line between ECU(ABS) and 4WD ECM(= TCCU : Transfer Case Control Unit) is set when CAN signal from ECU can't received for more than 1sec or ECU internal error occur.
If failure is detected ITM-ECU prohibits the ITM control and cuts the current to control coil.
Item
Detecting Condition
Possible Cause
DTC Strategy
ABS-ITM Communication Line, or ECU side malfunction
Poor connection of each unit
Open or short in CAN communication circuit
Fault of each communication unit
CAN HIGH/LOW circuit open/short.
Faulty ABS.
Enable Conditions
IG KEY "ON" , ENGINE "ON "
Threshold Value
Loss of the 4D0H message for greater than 1 second
Diagnostic Time
1 sec.
MIL on condition
0.5 sec.
Fail Safe
Prohibiting ITM control
Fig.1) CAN Signal : high & low