Dtc C1581/81 Assist Map Un-Writing
DESCRIPTION
INSPECTION PROCEDURE
PERFORM ASSIST MAP WRITING
CHECK CAN COMMUNICATION SYSTEM
CHECK ECM
CHECK SKID CONTROL ECU
DTC C1581/81 Assist Map Un-Writing |
DESCRIPTION
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.- HINT:
- 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 No.
| DTC Detection Condition
| Trouble Area
|
C1581/81
| Assist map not written in power steering ECU
| - CAN communication system
- Power steering ECU
- ECM
- Skid control ECU
|
INSPECTION PROCEDURE
- NOTICE:
- If replacing the power steering ECU, initialize and calibrate the torque sensor zero point (YARIS_NCP93 RM000000OSZ014X.html).
| 1.PERFORM ASSIST MAP WRITING |
Connect a Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Set the Techstream to Test Mode (select "Signal Check").
- HINT:
- Refer to the Techstream operator's manual for further details.
Wait for 7 seconds or more.
- HINT:
- Assist map is automatically written when approximately 7 seconds have elapsed after setting the Techstream to Test Mode. DTC C1581/81 will be cleared after the assist map is written.
Check for DTCs (YARIS_NCP93 RM000001AL601EX.html).
- OK:
- DTC C1581/81 is not output.
| 2.CHECK CAN COMMUNICATION SYSTEM |
Check for DTCs of the CAN communication system (YARIS_NCP93 RM000001D3E00OX.html).
- OK:
- DTCs are not output.
Check if a qualified ECM is installed.
- OK:
- A qualified ECM is installed.
Check if a qualified skid control ECU is installed.
- OK:
- A qualified skid control ECU is installed.