[ 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. U0431 ETACS DATA MALFUNCTION
Code No.U0431: ETACS 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 ETACS-ECU via the CAN bus lines.
 
 
DIAGNOSIS CODE SET CONDITIONS
The code is set when abnormality is detected in the signal received from ETACS-ECU.
 
 
PROBABLE CAUSES
  • Malfunction of the CAN bus line
  • Malfunction of ETACS-ECU power supply circuit system
  • ETACS-ECU malfunction
  • Malfunction of AWC-ECU
  • Coding not implemented

 
 
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 diagnosis code.
Check if the AWC diagnosis code No.U1195 is set (Refer to ).
Is the diagnosis code set?
Perform the relevant troubleshooting.
Go to Step 3.
 
STEP 3. M.U.T.-IIISE other system diagnosis code.
Check the ETACS diagnosis code (Refer to GROUP 54A - Troubleshooting ).
Is the diagnosis code set?
Perform the relevant troubleshooting.
Go to Step 4.
 
STEP 4. M.U.T.-IIISE other system data list.
Check the ETACS data list below (Refer to GROUP 54A - ETACS ).
  • Item No.77: Ambient temperature sensor
  • Item No.79: IG voltage
Is the check result normal?
Go to Step 5.
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ).
 
STEP 5. Check whether the diagnosis code is set again.
Is diagnosis code No.U0431 set?
Replace the AWC-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).