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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Automatic Transmission - 6T45 (MH7) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0722, P0723, P077C, or P077D >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify the scan tool parameter: ISS/OSS Supply Voltage=OK
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  3. Raise and support the vehicle.
    CAUTION:

    Support the lower control arms in the normal horizontal position in order to avoid damage to the drive axles. Do not operate the vehicle in gear with the wheels hanging down at full travel.

  4. Start and idle the engine.
  5. Transmission in Drive
  6. Increase the engine speed slowly to 3, 000 RPM and then back to idle. - Shift through all forward gears

    Verify the scan tool parameter: Transmission OSS = The value should change smoothly and gradually as the vehicle speed is increased and decreased.

    • If the value does not change smoothly and gradually 

      Refer to: Circuit/System Testing

    • Go to next step: If the value changes smoothly and gradually 
  7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  8. All OK.
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