2007 Toyota Yaris Code C1581

The power steering ECU outputs this DTC when it determines that the assist map is not written in the ECU.

The power steering ECU must be replaced when this DTC is output because this malfunction cannot be repaired.


The assist map data is written in the power steering ECU to control assisting power. The assist map is selected from five types based on the vehicle specification communication data (designation and grade package information).


DTC Detection Condition

Trouble Area


Assist map not written in power steering ECU

Power steering ECU

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