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.
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.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Wheel Speed Signal error
? Connector looseness and poor terminal to wire connection.
? CAN HIGH/LOW circuit open/short.
? Faulty CAN MODULE.(ABS)
? Faulty 4WD-ECM .
Threshold Value
? Condition1: Wheel speed signal value is invalid (over 511.875km/h), and maintained over 0.5 sec.
? Conditon2: Data can't be received in 0.5 sec.
? Condition3: No receiving of data for 0.5 sec after ignition is turned ON.
Fail Safe
? Change into 2WD mode.
FIG.1) CAN Signal : high & low