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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Twin Clutch SST - Lancer Evolution) >> Diagnosis < TC-SST > >> Diagnostic Trouble Code Procedures >> DTC U0121: ASC Time-Out Error >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
  1. STEP 1. Scan tool CAN bus diagnostics 

    Using the scan tool, diagnose the CAN bus lines.

    Q: Is the check result normal? 

    YES  : Go to Step 2.

    NO  : Repair the CAN bus lines. (Refer to TROUBLESHOOTING ). After repairing the CAN bus line, go to Step 2.

  2. STEP 2. Scan tool diagnostic trouble code 

    Check the ASC diagnostic trouble code. (Refer to TROUBLESHOOTING ).

    Q: Is the DTC set? 

    YES  : Perform the relevant troubleshooting.

    NO  : Go to Step 3.

  3. STEP 3. Check whether the DTC is reset. 

    Q: Is DTC No. U0121 set? 

    YES  : Replace the TC-SST assembly. (Refer to TRANSAXLE ASSEMBLY  ).

    NO  : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).

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