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Home >> Cadillac >> 2019 >> ATS V >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 8L45 (M5N M5T) Or 8L90 (M5U) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0815, P0816, P0826, or P1876 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Operate the component: S3 Transmission Shift Lever = M
  3. Verify the scan tool parameter: Driver Shift Control Mode = Active
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  4. Operate the component: S3 Transmission Shift Lever = Forward

    Verify the scan tool parameter: Up and Down Shift Switch = Up or Upshift

    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  5. Operate the component: S3 Transmission Shift Lever = Rearward

    Verify the scan tool parameter: Up and Down Shift Switch = Down or Downshift

    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  6. 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 
  7. All OK.
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