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Code No. U1197 Coding data unavailable
 
 
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 ).
  • If diagnostic trouble code No.U1197 is stored in ASC-ECU, always diagnose the CAN bus lines. If there is any fault in the CAN bus lines, an incorrect diagnostic trouble code may be stored. In this case, the stored diagnostic trouble code is not highly reliable.
  • Before replacing the ECU, ensure that the communication circuit is normal.
  • When diagnostic trouble code No.U1197 is stored in ASC-ECU, the diagnostic trouble code may also be stored in ETACS-ECU. When the diagnostic trouble code is stored in ETACS-ECU, carry out the diagnosis of the diagnostic trouble code for ETACS-ECU first.
 
 
OPERATION
ASC-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.
 
 
 
DIAGNOSTIC TROUBLE CODE SET CONDITIONS
ASC-ECU communicates with ETACS-ECU via CAN bus lines. This diagnostic trouble code is stored when the vehicle information received from the ETACS-ECU is invalid.
 
 
 
PROBABLE CAUSES
  • Malfunction of ETACS-ECU
  • Malfunction of engine control module
  • ETACS-ECUs have been interchanged between two vehicles.
  • Malfunction of ASC-ECU
  • External noise interference
  • ASC-ECUs have been interchanged between two vehicles.
 
 
 
 
DIAGNOSIS
STEP 1. M.U.T.-III CAN bus diagnosis
Use scan tool MB991958 to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
 
STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines
Is diagnostic trouble code No.U1192 stored?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. M.U.T.-III other system diagnostic trouble code
Use M.U.T.-III to check whether any diagnostic trouble code related to vehicles information is stored or not by the ETACS-ECU or engine control module.
Is the diagnostic trouble code stored?
Troubleshoot for the relevant diagnostic trouble code.
Go to Step 4.
 
STEP 4. ETACS-ECU coding data check
Refer to GROUP 00 - Precautions before Service/Coding List .
Is the check result normal?
Go to Step 5.
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ), and then go to Step 7.
 
STEP 5. Engine control module coding data check
Refer to GROUP 00 - Precautions before Service/Coding List .
Is the check result normal?
Go to Step 6.
Replace the engine control module (Refer to GROUP 13A - Engine control module <2.0L Engine> or GROUP 13C - Engine control module <2.4L Engine>), and then go to Step 7.
 
STEP 6. Check the part number of ETACS-ECU
Check the part number of ETACS-ECU.
Is the check result normal?
Go to Step 7.
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ), and then go to Step 7.
 
STEP 7. Check the part number of ASC-ECU
Check the part number of ASC-ECU.
Is the check result normal?
Go to Step 8.
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ), and then go to Step 9.
 
STEP 8. Check whether the diagnostic trouble code is stored again.
Erase the diagnostic trouble code.
Is diagnostic trouble code No.U1197 stored?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ), and then go to Step 9.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
 
STEP 9. Check whether the diagnostic trouble code is stored again.
Erase the diagnostic trouble code.
Is diagnostic trouble code No.U1197 stored?
Return to Step 1.
This diagnosis is complete.