Code No. U1108 Combination
meter CAN timeout
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- If the diagnosis
code No. U1108 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 combination meter cannot be received, the SRS-ECU sets the diagnosis
code No. U1108.
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 combination meter
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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  ).
On completion, go to Step 5.
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STEP 2. Check the M.U.T.-III Diagnosis code for other systems
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Check that the combination meter set a diagnosis code.
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Q.
Is the diagnosis code set?
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Diagnose the combination meter. Refer to GROUP 54A, Troubleshooting .
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Go to Step 3
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STEP 3. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set to 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 that the diagnosis code is reset.
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Q.
Is the diagnosis code set?
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Replace the combination meter. After replacing the combination meter, carry out
the CAN bus diagnostics. Then go to Step 4.
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A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the combination meter and the SRS-ECU (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points -
How to Cope with Intermittent Malfunctions ).
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STEP 4. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set to 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 that the diagnosis code is not reset.
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Q.
Is the diagnosis code set?
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Replace the SRS-ECU. After replacing the ECU, carry out the CAN bus diagnostics.
Then go to Step 5.
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A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the combination meter and the SRS-ECU (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points -
How to Cope with Intermittent Malfunctions ).
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STEP 5. Check whether the diagnosis code is reset.
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Recheck if the diagnosis code is set to 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 that the diagnosis code is reset.
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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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