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Diagnostic Procedure

  1. STEP 1. Scan tool CAN bus diagnostics 

    Using scan tool MB991958, diagnose the CAN bus lines.

    Q: Is the check result normal? 

    1. YES:  Go to  Step 3.
    2. NO:  Repair the CAN bus lines. (Refer to TROUBLESHOOTING .) After repairing the CAN bus line, go to STEP 2 below.
  2. STEP 2. Check whether the DTC is reset. 

    Q: Is DTC No. C1617 set? 

    1. YES:  Go to STEP 3 below.
    2. NO:  This diagnosis is complete.
  3. STEP 3. Scan tool diagnostic trouble code 

    Check if the AWC-related DTC No. U0100, U0101, U0121, U0126, or U0141 is set. (Refer to DIAGNOSTIC TROUBLE CODE TABLE  .)

    Q: Is the DTC set? 

    1. YES:  Perform the relevant troubleshooting.
    2. NO:  Go to STEP 4 below.
  4. STEP 4. Scan tool diagnostic trouble code 

    Q: Is the DTC set? 

    1. YES:  Perform the relevant troubleshooting.
    2. NO:  Go to STEP 5 below.
  5. STEP 5. Check whether the DTC is reset. 

    Q: Is DTC No. C1617 set? 

    1. YES:  Replace the AWC-ECU. (Refer to AWC-ECU  .) Then go to STEP 6 below.
    2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
  6. STEP 6. Check whether the DTC is reset. 

    Q: Is DTC No. C1613 set? 

    1. YES:  Return to  Step 1.
    2. NO:  This diagnosis is complete.
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