If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnostics Table ).
Whenever ECU is replaced, ensure that the CAN bus lines are normal.
OPERATION
Power is supplied to the EPS-ECU from the battery.
FUNCTION
The motor current is controlled according to the information on motor and resolver, and the information on CAN bus.
TROUBLE JUDGMENT
Judgment Criterion
The system data is out of the prestored control range, and the microcomputer determines that there is an internal problem.
Fail Safe, Back Up Function
The EPS-ECU stops the motor control and illuminates the electric power steering warning display, then sets the DTC C1550.
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