[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
23 -AUTOMATIC TRANSMISSION > 23A-CVT > TROUBLESHOOTING<S-AWC><S-AWC> > DIAGNOSIS CODE PROCEDURES > CODE NO. U0401 ENGINE DATA MALFUNCTION
Code No.U0401: Engine Data Malfunction
 
 
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.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
AWC-ECU communicates with the engine-ECU via the CAN bus lines.
 
 
DIAGNOSIS CODE SET CONDITIONS
The code is set when abnormality is detected in the signal received from the engine-ECU.
 
 
PROBABLE CAUSES
  • Malfunction of the CAN bus line
  • Engine malfunction
  • Malfunction of Engine-ECU
  • Malfunction of AWC-ECU

 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE CAN bus diagnostics.
Use M.U.T.-IIISE to perform the CAN bus diagnosis.
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 the engine diagnosis code (Refer to GROUP 13A - Troubleshooting ).
Is the diagnosis code set?
Perform the relevant troubleshooting.
Go to Step 3.
 
STEP 3. M.U.T.-IIISE data list.
Check the following data list (Refer to ).
  • Item No.25: Engine speed
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Go to Step 4.
 
STEP 4. Check whether the diagnosis code is set again.
Is diagnosis code No.U0401 set?
Replace the AWC-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).