[Previous][Next]
DTC C1564 Vehicle speed data invalid
 
 
cautionWhenever 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
  • Turn the ignition switch to the "ON" position (Engine running).
Judgment Criterion
  • When the vehicle speed information sent from the ASC-ECU is abnormal.
Fail Safe, Back Up Function
  • The EPS-ECU turns on the electric power steering warning lamp, and sets DTC No.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 system
  • Malfunction of the EPS-ECU
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Use scan tool (M.U.T.-IIISE) to check if the wheel speed sensor related DTC is set in ASC-ECU (Refer to GROUP 35C - Troubleshooting ).
Check if the DTC is set.
Is the DTC set?
Perform troubleshooting for ASC-ECU (Refer to GROUP 35C - Troubleshooting ).
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Turn the ignition switch to the "ON" position (Engine running). Check if the DTC is set.
Is the DTC set?
Replace the EPS motor (EPS-ECU). (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ).