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Home >> Cadillac >> 2019 >> CTS Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0815, P0816, P0826-P0828, or P085F - Manual Mode or Tap Up/Tap Down Switch Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2018 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Operate the component: S3 Transmission Shift Lever - Upshift & Downshift
  3. Verify the scan tool parameter: Up and Down Shift Switch = Upshift & Downshift
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  4. Operate the component:
    • S2R Transmission Manual Shift Switch - Right - Upshift
    • S2L Transmission Manual Shift Switch - Left - Downshift
  5. Verify the scan tool parameter: Up and Down Shift Switch = Upshift & Downshift
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 2

    • 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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