[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
55 -HEATER, AIR CONDITIONER AND VENTILATION > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > U0141 ETACS CAN Time-out
Code No. U0141: ETACS-ECU CAN time-out
 
 
caution
  • If diagnosis code No.U0141 is set in the A/C controller assembly (A/C-ECU), diagnose the CAN main bus line.
  • Whenever the ECU is replaced, ensure that the communication circuit is normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)
 
 
TROUBLE JUDGEMENT
The A/C controller assembly (A/C-ECU) receives air conditioner operation-related signal from the ETACS-ECU via the CAN bus lines. If the A/C controller assembly (A/C-ECU) can not receive the air conditioner operation-related signal at all on the ETACS-ECU, diagnosis code No.U0141 will be set.
 
 
 
COMMENTS ON TROUBLE SYMPTOM
Current trouble
  • Connector(s) or wiring harness in the CAN bus lines between the ETACS-ECU and the A/C controller assembly (A/C-ECU), the power supply system to the ETACS-ECU, the ETACS-ECU itself, or the A/C-ECU may be faulty.
Past trouble
  • Carry out diagnosis with particular emphasis on connector(s) or wiring harness in the CAN bus lines between the ETACS-ECU and the A/C controller assembly (A/C-ECU), and the power supply system to the ETACS-ECU. For diagnosis procedures, refer to "How to treat past trouble" (Refer to GROUP 00 - How to Treat Past Trouble ).
    noteFor a past trouble, you can not find it by the M.U.T.-III SE CAN bus diagnostics even if there is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Cope with Intermittent Malfunction and check the CAN bus lines. 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 - CAN Bus Line Diagnostic Flow ).
    cautionIf the ignition switch is turned on without starting the engine and then three minutes pass, the A/C controller assembly (A/C-ECU) may set U0141 as past trouble.
 
 
 
PROBABLE CAUSES
  • Damaged wiring harness or connectors
  • Malfunction of the ETACS-ECU
  • Malfunction of the A/C controller assembly (A/C-ECU)
 
 
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE CAN bus diagnostics
Use the M.U.T.-IIISE to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C, Troubleshooting ).
 
STEP 2. M.U.T.-IIISE other system diagnosis code
Check if diagnosis code is set in the ETACS-ECU.
Is the diagnosis code set?
Diagnose the ETACS-ECU (Refer to GROUP 54A - ETACS ).
Go to Step 3.
 
STEP 3. M.U.T.-IIISE other system diagnosis code
Check if a diagnosis code, which relates to CAN communication-linked systems below, is set.
  • Combination meter
    U0141: ETACS-ECU timeout
Is the diagnosis code set?
Go to Step 4.
Go to Step 5.
 
STEP 4. Check whether the diagnosis code is set again.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: "LOCK" (OFF) to "ON"
(3) Check if the diagnosis code is set.
Is the diagnosis code set?
Replace the ETACS-ECU.
A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the ETACS-ECU and the A/C controller assembly (A/C-ECU) (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
 
STEP 5. Check whether the diagnosis code is set again.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: "LOCK" (OFF) to "ON"
(3) Check if the diagnosis code is set.
Is the diagnosis code set?
Replace the A/C controller assembly (A/C-ECU).
A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the ETACS-ECU and the A/C controller assembly (A/C-ECU) (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).