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Diagnostic System Check

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. VERIFY CUSTOMER CONCERN-Understand and validate the customer concern. Inspect the visible system components for obvious damage or conditions that may cause the concern.
  2. BULLETIN SEARCH-Check for related bulletins, recall/field actions and preliminary information.
  3. MECHANICAL CONCERNS-Verify the symptom is not exclusively a mechanical concern.
    • If the symptom is not a mechanical concern 
    4. NOTE:

    Do not clear any DTCs unless instructed to do so by a diagnostic procedure. If any DTC is Powertrain related, select Capture Info to store DTC and Freeze Frame/Failure Records to the scan tool.

  4. VEHICLE POWER UP VERIFICATION-Ignition ON, verify the vehicle powers up.
    • If the vehicle powers up 
  5. CONTROL MODULE COMMUNICATION and DTC CHECK-Using a scan tool, perform the Vehicle DTC Information function and verify at least one control module communicates with the scan tool. Record on the Repair Order the following information:
    • Any control module that is not communicating.
    • Any DTC, including symptom byte, and the control module that has set the DTC.
    • If the scan tool does not communicate with any control module on the vehicle 

      Refer to Data Link References .

    • If the scan tool communicates with any control module 
  6. CONTROL MODULE INTERNAL PERFORMANCE FAULTS-Verify there are no current control module Internal Hardware Performance DTCs set.
    • If no DTC of this type is set 
  7. CONTROL MODULE COMMUNICATION VERIFICATION-Verify the vehicle is not built with any control module listed as not communicating with the scan tool, refer to Data Link References .
    • If the vehicle is built with a control module that is not communicating 

      Refer to Data Link References .

    • If all control modules the vehicle is built with are communicating 
  8. COMMUNICATION and POWERMODE FAULTS-Verify there are no current control module Power Mode or Communication DTCs set.
    • If no DTC of this type is set 
    9. NOTE:

    The engine may start during this test. Ensure the vehicle is out of gear and the parking brake is applied. Turn the engine OFF as soon as the crank power mode parameter has been observed.

  9. POWER MODE VERIFICATION-Driver door open, observe the scan tool Power Mode parameter while cycling the ignition switch through all the power modes. Verify the current Power Mode parameter matches the actual ignition switch positions.
    • If the Power Mode parameter does not match the actual ignition switch positions 

      Refer to Power Mode Mismatch .

    • If the Power Mode parameter matches the actual ignition switch positions 
  10. ENGINE CRANK and RUN VERIFICATION-Verify that the engine cranks and runs.
    • If the engine cranks and runs 
  11. REMAINING DTC REVIEW-Verify there are no other DTCs set.
    1. Voltage DTCs
    2. Programming, Setup, Configuration or Software Performance DTCs
    3. Component related DTCs
    4. System related DTCs
    5. Any remaining DTCs
    • If no other DTCs are set 
  12. EMISSION RELATED INSPECTION/MAINTENANCE TESTING CONCERNS-If inspection and maintenance checks are required in your region, verify the customer concern is not related to inspection/maintenance testing.
    • If the customer concern is not related to inspection/maintenance testing 
  13. SYMPTOM DIAGNOSIS-Diagnose any remaining customer concern. Refer to Symptoms - Vehicle .
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