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Code No. U1211 ENG Parity/Toggle bit error
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be stored. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • 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
Engine-related signals are sent or received to and from between ASC-ECU and engine ECU via CAN bus lines.
 
 
DIAGNOSTIC TROUBLE CODE SET CONDITIONS
This diagnostic trouble code is stored when the engine ECU has detected an abnormal engine-related signal.
 
 
PROBABLE CAUSES
  • Malfunction of ETACS-ECU
  • The ASC-ECU, which was used on another vehicle, is installed on this vehicle.
  • The ETACS-ECU, which was used on another vehicle, is installed on this vehicle.
  • The CAN bus line is defective.
  • Malfunction of engine control module
  • Malfunction of ASC-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use the scan tool MB991958 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. U1211 stored?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Use scan tool MB991958 to confirm a diagnostic trouble code of other systems.
Check if the diagnostic trouble code is stored in the engine ECU (Refer to GROUP 13A - Diagnostic Trouble Code Chart ).
Is the diagnostic trouble code stored?
Troubleshoot the engine ECU diagnostic trouble code. Then go to Step 5.
Go to Step 4.
 
STEP 4. ETACS-ECU coding data check.
Using scan tool MB991958, check if any abnormality is present to the coding data which are stored in the ETACS-ECU. (Refer to GROUP 00 - Coding Reference Table ).
Is the check result normal?
Go to Step 5.
Replace ETACS-ECU. (Refer to GROUP 54A - ETACS-ECU .) Then go to Step 7.
 
STEP 5. Check part number of ASC-ECU.
Check if the part number of ASC-ECU.
Is the check result normal?
Go to Step 6.
Replace the hydraulic unit (integrated ASC-ECU). (Refer to .) Then go to Step 7.
 
STEP 6. Diagnostic trouble code recheck
Check again if the diagnostic trouble code is stored.
(1) Erase the stored diagnostic trouble code.
(2) Ignition switch: "LOCK" (OFF)
(3) Ignition switch: "ON"
Is diagnostic trouble code No. U1211 stored?
Replace the engine control module. (Refer to GROUP 13A - engine control module .) Then go to Step 7.
This diagnosis is complete.
 
STEP 7. Diagnostic trouble code recheck
Check again if the diagnostic trouble code is stored.
(1) Erase the stored diagnostic trouble code.
(2) Ignition switch: "LOCK" (OFF)
(3) Ignition switch: "ON"
Is diagnostic trouble code No. U1211 stored?
Replace the hydraulic unit (integrated with ASC-ECU). (Refer to .)
This diagnosis is complete.