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DTC C1564 Vehicle speed data invalid
 
 
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 vehicle speed information from the ASC-ECU.
 
 
 
FUNCTION
The EPS-ECU controls the assist force based on the vehicle speed information from the ASC-ECU.
 
 
 
TROUBLE JUDGMENT
Check Conditions
  • The power supply circuit system DTC (C1540, C1541) is not set.
Judgment Criterion
  • When the vehicle speed information sent from the ASC-ECU is abnormal.
Fail Safe, Back Up Function
  • The EPS-ECU sets DTC C1564.
  • Since the assist force is calculated according to the vehicle speed, the assist is continued, but the assist force may be different from the usual time.
 
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the ASC-ECU
  • Malfunction of the EPS-ECU
 
 
 
 
DIAGNOSIS
1. Check M.U.T.-IIISE data list (No.18 Vehicle speed) (Refer to ).
2. Check if ASC-ECU sets DTC (GROUP 35C - Troubleshooting ).
3. Replace the EPS-ECU (Refer to ).