Code No. U1197: Coding data unavailable
DIAGNOSTIC FUNCTION
CVT-ECU checks that the coding information is normal.
JUDGEMENT CRITERIA
When the CVT-ECU cannot receive "programmed" signal within three seconds after the CVT-ECU is activated.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Variant coding for ETACS-ECU has not been implemented.
- Malfunction of ETACS-ECU
- Malfunction of CVT-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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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 3.
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 Repair the CAN bus lines, and then go to Step 2.
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STEP 2. Symptom recheck after erasing diagnosis code
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(1)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(2)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Go to Step 3.
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The inspection is complete.
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STEP 3. M.U.T.-III diagnosis code
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Check if the ETACS-related diagnosis code is set.
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Q.
Is the ETACS-related diagnosis code set?
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Carry out the appropriate troubleshooting.
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Go to Step 4.
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STEP 4. ETACS-ECU coding data check
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Use M.U.T.-III to check if coding data stored in ETACS-ECU is normal.
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Q.
Is the check result normal?
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Go to Step 5.
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Replace the ETACS-ECU.
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STEP 5. Symptom recheck after erasing diagnosis code
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(1)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(2)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace CVT-ECU.
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Intermittent malfunction.
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