Code No. U1109: ETACS CAN timeout
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- If diagnosis code No. U1109 is set, diagnose the CAN bus lines.
- When replacing the ECU, always check that the SRS circuit is normal.
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FUNCTION
If the signal from ETACS-ECU cannot be received, the SRS-ECU sets diagnosis code No. U1109.
TROUBLE JUDGEMENT
Because of the CAN-B bus circuit malfunction, if SRS-ECU becomes unable to perform the normal data transmission, SRS-ECU determines that an abnormality is present.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Malfunction of SRS-ECU
- Malfunction of the ETACS-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 line (Refer to GROUP 54C - Troubleshooting  ).
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STEP 2. M.U.T.-III other system diagnosis code
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Check again if the diagnosis code is set in the ETACS-ECU.
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Q.
Is the diagnosis code set?
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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. Check the M.U.T.-III Diagnosis code for other systems
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Check if diagnosis code No. U1109 is set in the combination meter.
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Q.
Is the diagnosis code set?
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Go to Step 4.
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Go to Step 5.
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STEP 4. Diagnosis code recheck
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Check again if the diagnosis code is set in the SRS-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 set.
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Q.
Is the diagnosis code set?
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Replace the ETACS-ECU. After replacing the combination meter, carry out the CAN bus diagnostics. Then go to Step 6.
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A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the ETACS-ECU and the SRS-ECU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
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STEP 5. Diagnosis code recheck
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Check again if the diagnosis code is set in the SRS-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 set.
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Q.
Is the diagnosis code set?
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Replace the SRS-ECU. After replacing the combination meter, carry out the CAN bus diagnostics. Then go to Step 6.
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A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the SRS-ECU and the ETACS-ECU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
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STEP 6. Check whether the diagnosis code is set again.
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Recheck if the diagnosis code is set in the SRS-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)On completion, check whether the diagnosis code is set again.
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Q.
Is the diagnosis code set?
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Return to Step 1.
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The procedure is complete.
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