Code No. U0100:
Engine CAN timeout
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- If
there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to
this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnostics Table
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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OPERATION
EPS-ECU receives engine revolution signal from the engine-ECU.
DIAGNOSIS CODE SET CONDITIONS
- The engine speed signal sent to the EPS-ECU is no signal.
- The engine speed signal is not sent from the engine-ECU, and the microcomputer determines that
there is a problem in the engine speed measurement system.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Malfunction of the EPS-ECU
- Malfunction of the engine-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use 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 3.
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 Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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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 diagnosis code U0100 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. M.U.T.-III data list
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Check the following service data (Refer to ).
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- Item No. 07: Engine speed
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Q.
Is the check result normal?
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Go to Step 4.
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Perform troubleshooting for engine-ECU (Refer to GROUP 13A - Troubleshooting/Inspection
Chart for Diagnosis code ). Then go to Step 4.
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STEP 4. Check whether the diagnosis code is set again.
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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 diagnosis code U0100 set?
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Replace the EPS-ECU (Refer to ). Then go to Step
5.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
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STEP 5. Check whether the diagnosis code is set again.
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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 diagnosis code U0100 set?
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Return to Step 1.
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This diagnosis is complete.
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