Code No.U0100 Engine CAN timeout
caution |
- If diagnosis code No. U0100 is set, be sure to diagnose the CAN bus line.
- When replacing the ECU, always check that the communication circuit is normal.
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DIAGNOSTIC FUNCTION
The combination meter sets diagnosis code No.U0100 when it cannot receive signals from the engine-ECU.
JUDGEMENT CRITERIA
With the ignition switch is at ON position, diagnosis code No. U1190 is not set and diagnosis code No. U1195 is not set, if the communication with engine-ECU cannot be established for 5000 ms or more, the combination meter determines that a problem has occurred.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Malfunction of engine-ECU
- Malfunction of combination meter
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting
).
STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set in the engine-ECU.
Q.
Is the diagnosis code set?
Troubleshoot the engine (Refer to GROUP 13A - Diagnosis Code Chart
.)
Go to Step 3.
STEP 3. Check the M.U.T.-III Diagnosis code for other systems
Check if diagnosis code No. U0100 is set in the ETACS-ECU.
Q.
Is the diagnosis code set?
Go to Step 4.
Go to Step 5.
STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set in the combination meter.
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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?
Replace the engine-ECU.
A poor connection, open circuit, or other intermittent malfunction in the CAN bus line between the combination meter and the engine-ECU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction
.)
STEP 5. Diagnosis code recheck
Check again if the diagnosis code is set in the combination meter.
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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?
Replace the combination meter.
A poor connection, open circuit, or other intermittent malfunction in the CAN bus line between the combination meter and the engine-ECU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction
.)