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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 (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 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 (GROUP 35C - Troubleshooting ).
2. Replace the EPS-ECU (Refer to ).