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DTC U0431: ETACS Data Malfunction
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC 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.
 
 
DTC SET CONDITIONS
The DTC 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
STEP 1. Scan tool (M.U.T.-IIISE) CAN bus diagnostics.
Use scan tool (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 - Diagnosis, Can Bus Diagnostics Table ).
 
STEP 2. Scan tool (M.U.T.-IIISE) DTC.
Check if the AWC DTC U1195 is set (Refer to ).
Is the DTC set?
Perform the relevant troubleshooting.
Go to Step 3.
 
STEP 3. Scan tool (M.U.T.-IIISE) other system DTC.
Check the ETACS DTC (Refer to GROUP 54A - Diagnosis, Diagnostic Trouble Code Chart ).
Is the DTC set?
Perform the relevant troubleshooting.
Go to Step 4.
 
STEP 4. Scan tool (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 DTC is set again.
Is the DTC U0431 set?
Replace the AWC-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).