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Code No. U1109 ETACS CAN timeout/Not equipped
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnostics Table ).
  • If diagnostic trouble code U1109 is set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect diagnostic trouble code may be set. In this case, the set diagnostic trouble code is not highly reliable.
  • Before replacing the ECU, ensure that the communication circuit is normal.
  • When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to and ).
 
 
OPERATION
The ASC-ECU communicates with the ETACS-ECU via the CAN bus lines.
 
 
DIAGNOSTIC TROUBLE CODE SET CONDITIONS
If the ACS-ECU cannot receive any signal from the ETACS-ECU for a predetermined period, this diagnostic trouble code will be set.
 
 
PROBABLE CAUSES
  • The CAN bus line is defective.
  • Malfunction of the ETACS-ECU
  • Malfunction of the hydraulic unit assembly (integrated with ASC-ECU)
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus lines.
Use scan tool (M.U.T.-III) to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus line (Refer to GROUP 54C, Troubleshooting ). On completion, go to Step 2.
 
STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines
Is diagnostic trouble code No. U1109 set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Use scan tool (M.U.T.-III) to confirm a diagnostic trouble code of other systems.
Check whether a diagnostic trouble code is set in the ETACS-ECU (Refer to GROUP 54A, ETACS-ECU, Troubleshooting - Diagnostic Trouble Code Chart ).
Is the diagnostic trouble code set?
Follow the relevant diagnostic trouble code procedure. Then go to Step 6.
Go to Step 4.
 
STEP 4. Use scan tool (M.U.T.-III) to confirm a diagnostic trouble code of other systems.
Check whether an ETACS-ECU "time-out" related diagnostic trouble code is set in other ECUs.
Is the diagnostic trouble code set?
Replace the ETACS-ECU (Refer to GROUP 54A, ETACS-ECU ). Then go to Step 6.
Go to Step 5.
 
STEP 5. Check whether the diagnostic trouble code is set again.
Check again if the diagnostic trouble code is set.
(1) Erase the set diagnostic trouble code.
(2) Ignition switch: "LOCK" (OFF)
(3) Ignition switch: "ON"
Is diagnostic trouble code No. U1109 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then go to Step 6.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
 
STEP 6. Check whether the diagnostic trouble code is set again.
Check again if the diagnostic trouble code is set.
(1) Erase the set diagnostic trouble code.
(2) Ignition switch: "LOCK" (OFF)
(3) Ignition switch: "ON"
Is diagnostic trouble code No. U1109 set?
Return to Step 3.
This diagnosis is complete.