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Home >> Chevrolet >> 2014 >> Spark LS, Automatic CVT Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - JATCO CVT >> Diagnostic Information and Procedures >> DTC P1790: Transmission Control Module >> Circuit/System Verification

Circuit/System Verification

  1. Ignition OFF for at least one minute to allow for the complete shutdown of the K71 Transmission Control Module. Ignition ON.
  2. Using a scan tool, erase the CVT calibration data in the TCM.
  3. Using a scan tool, run the CVT calibration process.
  4. Clear DTC P1790.
  5. 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. The DTC should not set.
    • If the DTC does not set 
  6. All OK.
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