Wheel Speed Sensor senses vehicle speed and difference between front and rear wheel speed.
Opreation for getting Rotating Speeds of front/rear wheel can be got from deviding wheel speed sensor Rotating Speeds of front/rear by 2.
In case of ESP(or FTCS) system applied 4WD ECM(= TCCU : Transfer Case Control Unit) receives this signal through CAN line, If it is not the case 4WD ECM receives this signal directly by using PWM communication line.
The wheel speed sensor is the essential component the ITM ECU uses to determine how to distribute driving force to front / rear wheel with steering angle sensor signal and TPS, brake signal.
This code related to communication line between ECU and 4WD ECM(= TCCU : Transfer Case Control Unit) is set when CAN signal from ECU can't received for more than 1sec or ECM internal error occur.
If failure is detected 4WD ECM prohibits the ITM control and cuts the current to control coil.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Signal Monitoring |
•
ABS MODULE, VDC connector looseness and poor terminal to wire connection.
•
Wheel sensor comm line circuit open/short.
•
Faulty Wheel sensor.
•
Faulty ABS(VDC) MODULE
•
Open or short in the CAN communication circuit |
Enable Conditions |
•
Driving state | |
Threshold Value |
•
When there is an open in the CAN communication circuit or the 4WD ECM senses that there is a wrong signal. | |
Diagnostic Time |
•
1 sec. | |
MIL on condition |
•
0.5 sec. | |
Fail Safe |
•
Prohibiting ITM control |
Fig.1) CAN Signal : high & low
