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Home >> Mitsubishi >> 2017 >> Lancer SE >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (Twin Clutch-SPORTRONIC Shift Transmission (TC-SST) - With Diagnostics - Lancer (5 Of 6)) >> Diagnosis < Active Center Differential (ACD) > >> Diagnostic Trouble Code Procedures >> DTC C1242: G and Yaw Rate Sensor System (Abnormality of Longitudinal G Sensor Output Signal) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2015 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 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.
  2. STEP 2. Check whether the DTC is reset. 

    Q: Is DTC No. C1242 set? 

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

    Check the ASC diagnostic trouble code. (Refer to DIAGNOSTIC TROUBLE CODE TABLE ).

    Q: Is the check result normal? 

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

    Check if the stoplight switch-related, or wheel speed sensor-related diagnostic trouble code is set.

    Q: Is the DTC set? 

    1. YES:  Perform the relevant troubleshooting.
    2. NO:  Go to Step 5.
  5. STEP 5. Check of G and yaw rate sensor installation status. 

    Check that the G and yaw rate sensor is installed correctly. (Refer to G AND YAW RATE SENSOR ).

    Q: Is the check result normal? 

    1. YES:  Go to Step 6.
    2. NO:  Reinstall the G and yaw rate sensor correctly. Then go to Step 6.
  6. STEP 6. Scan tool data list 

    Item No. 31: Longitudinal G sensor (Refer to DATA LIST REFERENCE TABLE  ).

    Q: Is the check result normal? 

    1. YES:  Go to Step 7.
    2. NO:  Replace the G and yaw rate sensor. (Refer to G AND YAW RATE SENSOR ). Then go to  Step 8.
  7. STEP 7. Check whether the DTC is reset. 

    Q: Is DTC No. C1242 set? 

    1. YES:  Replace the AWC-ECU. (Refer to AWC-ECU ). Then go to Step 8.
    2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
  8. STEP 8. Check whether the DTC is reset. 

    Q: Is DTC No. C1242 set? 

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