Vehicle electonic control need many informations of each module to reduce exhaust and increase convenience/safety by optimum control. The TCM can either receive data from the Engine Control Module or ABS control module, or it can send data to the ECM and ABSECM by using CAN communication. The CAN communicaton is one of the vehicle communications method, which is now widely used to transfer the vehicle data.
This code is set when PCM/TCM detected that worng message is sent or No reception of communication line.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
CAN BUS OFF |
•
Open or short in CAN line
•
PCM/TCM |
Enable Conditions |
•
Time after TCM turns on >0.5sec
•
Battery voltage > 10V
•
Input speed > 400rpm | |
Threshold value |
•
BUS OFF flag of CAN Controller ON | |
Detecting Time |
•
More than 1sec | |
Fail safe |
•
Engine speed:3000rpm
•
Throttle : 50%
•
Engine torque : Max*0.7 * Inhibit TIME OUT happen at BUS OFF happen. |
Fig 1) Wave form of "CAN COMMUNICATION"
