Code No. U1770:
Implausible coding data
Diagnostic function
CVT-ECU checks that the coding information is normal.
JUDGEMENT CRITERIA
The ETACS-ECU coding information about whether the G sensor for CVT-ECU or active stability control
system is mounted or not is incorrect.
PROBABLE CAUSES
- Malfunction of the CAN bus line
- ETACS-ECU coding information is abnormal
- ETACS-ECU failure or improper assembly
- 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 2.
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 Repair the CAN bus lines. (Refer to GROUP 54C -
Troubleshooting.)
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STEP 2. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check if the ETACS-ECU stores a diagnosis code.
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Q.
Is the diagnosis code stored?
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Diagnose the ETACS-ECU. (Refer to GROUP 54A -
Troubleshooting)
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Go to Step 3.
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STEP 3. ETACS-ECU coding data check
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Using M.U.T.-III, check if any abnormality is present in the coding data below which is
stored in the ETACS-ECU.
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Not present: G sensor for CVT
Not present: A.S.C
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the coding data. If repair is impossible, replace the ETACS-ECU.
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STEP 4. Diagnosis code recheck
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Check again if the diagnosis code is stored in the CVT-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(3)Check if the diagnosis code is stored.
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Q.
Is the diagnosis code stored?
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Replace the CVT-ECU.
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Intermittent malfunction.
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