Code No.U0141:
ETACS CAN timeout
| caution |
- 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
The signals from the ETACS-ECU are sent to the EPS-ECU.
DIAGNOSIS CODE SET CONDITION
EPS-ECU receives the fault detect enable data from the ETACS-ECU via CAN bus lines. If
the EPS-ECU cannot receive the fault detect enable data from the ETACS-ECU, diagnosis code No.U0141
will be set.
COMMENT ON TROUBLE SYMPTOM
Current trouble
- The wiring harness or connector in the CAN bus lines between the EPS-ECU and ETACS-ECU, the
power supply system of the ETACS-ECU, or the EPS-ECU itself may be faulty.
Past trouble
- If diagnosis code No.U0141 is set as a historic trouble, carry out the diagnosis
with particular emphasis on the wiring harness and connector in the CAN bus lines between the
EPS-ECU and ETACS-ECU as well as on the power supply system of the ETACS-ECU. For diagnosis procedures,
refer to "How to treat past trouble" (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points ).
| note |
In case of a historic trouble, the M.U.T.-III CAN bus diagnosis cannot find the problem
even when there is an abnormality in the CAN bus. In this case, be sure to diagnose the CAN
bus lines in the same manner as for "How to Cope with Intermittent Malfunction" (refer to GROUP
00 - How to Use Troubleshooting/Inspection Service Points ).
You can narrow down the possible cause of the trouble by referring to the diagnosis code, which
is set regarding the CAN communication-linked ECUs (refer to GROUP 54C - Explanation
About the M.U.T.-III CAN Bus Diagnostics ).
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PROBABLE CAUSES
- Defective harness wire(s) or connector(s)
- The ETACS-ECU may be defective
- Malfunction of the EPS-ECU
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STEP 1. M.U.T.-III CAN bus diagnosis
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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 lines (Refer to GROUP 54C, Troubleshooting ).
After repairing the CAN bus lines, go to Step 2.
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STEP 2. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check if the ETACS-ECU sets a diagnosis code.
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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 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 U0141 set?
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Replace the EPS-ECU (Refer to ), and then go to
Step 4.
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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 U1109 set?
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Return to Step 1.
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The diagnosis is complete.
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