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
