Code No.U1100 Engine CAN timeout
caution |
- If diagnosis code No.U1100 is set in the SRS-ECU, diagnose the CAN main bus line.
- Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
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TROUBLE JUDGEMENT
If signal from the engine-ECU cannot be received for 500 milliseconds or more, the SRS-ECU sets diagnosis code No. U1100.
PROBABLE CAUSES
- Malfunction of the engine-ECU
- Malfunction of the SRS-ECU
- Malfunction of the CAN bus
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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 6.
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STEP 2. Check the M.U.T.-III Diagnosis code for other systems
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Check that the engine-ECU sets a diagnosis code.
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Q.
Is the diagnosis code set?
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Diagnose the engine-ECU. Refer to GROUP 13A, 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. U1100 is set in the ETACS-ECU.
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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. Check whether the diagnosis code is set again.
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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 "LOCK" (OFF) position to "ON" position.
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(3)On completion, check that the diagnosis code is set again.
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Q.
Is the diagnosis code set?
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Replace the engine-ECU. After replacing the ECU, carry out the CAN bus diagnostics. Then go to Step 6.
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A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the engine-ECU 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 set again.
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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 "LOCK" (OFF) position to "ON" position.
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(3)On completion, check that the diagnosis code is not set again.
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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 6.
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A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the engine-ECU 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 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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