[Previous][Next]
DTC C1564: Vehicle speed data invalid
 
 
cautionIf 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 ).
 
 
TROUBLE JUDGMENT
If the ETACS-ECU <Vehicles without Keyless Operation System> or KOS&OSS-ECU <Vehicles with Keyless Operation System> receives an abnormal vehicle speed signal from the ASC-ECU, it sets DTC C1564.
 
 
JUDGMENT CRITERIA
When the ETACS-ECU <Vehicles without Keyless Operation System> or KOS&OSS-ECU <Vehicles with Keyless Operation System> receives an abnormal vehicle speed signal consecutively with the ignition switch in the "ON" position, the ECU determines that there is a failure.
 
 
TROUBLESHOOTING HINTS
  • The ASC-ECU may be faulty.
  • The ETACS-ECU may be faulty. <Vehicles without Keyless Operation System>
  • The KOS&OSS-ECU may be faulty. <Vehicles with Keyless Operation System>
  • The CAN bus line may be faulty.
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus lines.
Use the scan tool to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). After repairing the CAN bus lines, go to Step 2.
 
STEP 2. DTC recheck after resetting CAN bus lines.
Recheck if DTC C1564 is set.
(1) Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC set?
Go to Step 3.
The procedure is complete.
 
STEP 3. Use scan tool (M.U.T.-III) to confirm a DTC of other systems.
Check whether the ASC-ECU sets a DTC.
Is the DTC set?
Perform the troubleshooting for the ASC-ECU (Refer to GROUP 35C - Troubleshooting ).
Go to Step 4.
 
STEP 4. Check whether the DTC is set again.
Recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC C1564 set?
Replace the ETACS-ECU <Vehicles without Keyless Operation System> (Refer to GROUP 54A - ETACS ) or KOS&OSS-ECU <Vehicles with Keyless Operation System> (Refer to GROUP 42B - KOS&OSS-ECU )
The diagnosis is complete.