DTC C1559 Lost Communication of Wheel speed information
caution
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
The EPS-ECU receives the wheel speed information from the ASC-ECU.
FUNCTION
Based on the wheel speed information the EPS-ECU receives, the EPS-ECU performs the control to improve the steering wheel return.
TROUBLE JUDGMENT
Check Conditions
The power supply circuit system DTC (No. C1540, C1541) is not set.
Judgment Criterion
When wheel speed information cannot be received from the ASC-ECU.
Fail Safe, Back Up Function
The EPS-ECU sets DTC No. C1559.
Aggravated feeling of steerage
TROUBLESHOOTING HINTS
Malfunction of the ASC-ECU
Malfunction of the EPS-ECU
DIAGNOSIS
1. Check if ASC-ECU sets DTC (Refer to GROUP 35C - Troubleshooting ).
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