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DTC U0141: ETACS CAN timeout
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code (DTC) may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
  • The signals from the ETACS-ECU are sent to the EPS-ECU.
 
 
DIAGNOSTIC TROUBLE 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, DTC 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 DTC 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, How to Treat Past Trouble ).
    noteIn case of a historic trouble, the scan tool (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, How to Cope with Intermittent Malfunctions ). You can narrow down the possible cause of the trouble by referring to the diagnostic trouble code, which is set regarding the CAN communication-linked ECUs (refer to GROUP 54C - Explanation About the Using SCAN Tool (M.U.T.-III), diagnose the CAN bus lines. ).
 
 
PROBABLE CAUSES
  • Defective harness wire(s) or connector(s)
  • The ETACS-ECU may be defective
  • Malfunction of the EPS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III) CAN bus diagnosis
Use scan tool (M.U.T.-III) to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). After repairing the CAN bus lines, go to Step 2.
 
STEP 2. Use scan tool (M.U.T.-III) to confirm a diagnostic trouble code of other systems.
Check if the ETACS-ECU sets a diagnostic trouble code.
Is the diagnostic trouble code set?
Diagnose the ETACS-ECU (Refer to GROUP 54A - Diagnosis, Diagnostic Trouble Code Chart ).
Go to Step 3.
 
STEP 3. Check whether the diagnostic trouble code is set again.
(1) Erase the diagnostic trouble code.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the diagnostic trouble code is set.
Is DTC U0141 set?
Replace the EPS-ECU (Refer to ), and then go to Step 4.
Go to Step 4.
 
STEP 4. Check whether the diagnostic trouble code is set again.
(1) Erase the diagnostic trouble code.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the diagnostic trouble code is set.
Is DTC U0141 set?
Return to Step 1.
The diagnosis is complete.