Code No. C1564:
Vehicle speed data invalid
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If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C - CAN Bus Diagnostics Table  ).
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DIAGNOSTIC FUNCTION
If the ETACS-ECU <Vehicles without keyless operation system> or KOS-ECU <Vehicles
with keyless operation system> receives an abnormal vehicle speed signal from the ASC-ECU,
it sets code No. C1564.
JUDGEMENT CRITERIA
When the ETACS-ECU <Vehicles without keyless operation system> or KOS-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.
PROBABLE CAUSES
- The ASC-ECU may be defective.
- Malfunction of ETACS-ECU <Vehicles without keyless operation system>
- Malfunction of KOS-ECU <Vehicles with keyless operation system>
- The CAN bus may be defective.
- Damaged wiring harness and connector
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnostics Table ).
After repairing the CAN bus lines, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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Recheck if diagnosis code No. C1564 is set.
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(1)Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
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(2)Check if the diagnosis code is set.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is the diagnosis code set?
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Go to Step 3.
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The procedure is complete.
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STEP 3. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check if the ASC-ECU sets a diagnosis code.
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Q.
Is the diagnosis code set?
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Perform the troubleshooting for the ASC-ECU (Refer to GROUP 35C - Troubleshooting ).
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Go to Step 4.
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STEP 4. Check whether the diagnosis code is set again.
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Recheck if the diagnosis code is set.
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(1)Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
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(2)Check if the diagnosis code is set.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. C1564 set?
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Replace the ETACS-ECU <Vehicles without keyless operation system> (Refer
to ) or KOS-ECU. <Vehicles with keyless operation
system> (Refer to GROUP 42B, KOS-ECU ).
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The diagnosis is complete.
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