TPS(or APS) signal which is used for judging driver's intention is received from engine ECU through CAN line.
This signal is a criteria signal to determind amount of torque distribution at front/rear wheel with steering angle sensor, wheel speed sensor, break signal.
This code related to communication line between ECU and 4WD ECM(=TCCU : Transfer Case Control Unit). It is set when CAN signal from ECU can't received for more than 1sec or ECU 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 |
•
ECM connector looseness and poor terminal to wire connection.
•
CAN HIGH/LOW circuit open/short.
•
APS(TPS) faulty.
•
Faulty ECM . |
Enable Conditions |
•
IG KEY "ON" or Driving | |
Threshold Value |
•
When TPS signal has an error. | |
Diagnostic Time |
•
1 sec. | |
MIL on condition |
•
0.5 sec. | |
Fail Safe |
•
Prohibiting ITM control |
Fig.1) CAN Signal : high & low
