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Home >> Cadillac >> 2017 >> Escalade ESV Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Automatic Transmission - 6L80 (MYC) Or 6L90 (MYD) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0877 or P0878: Transmission Fluid Pressure Switch 4 >> Circuit/System Verification

Circuit/System Verification

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  1. Engine idling in Park with parking brake applied, and drive wheels chocked.
  2. Verify the scan tool Transmission Fluid Pressure Switch 4 parameter displays the correct values for each gear range while placing the gear select lever in Park, Reverse, and Neutral position. Refer to Transmission Fluid Pressure Switch Logic for the correct gear range states.
    • If the correct states are not displayed 

      Refer to Circuit/System Testing.

    • If the correct states are displayed 
  3. Place the gear select lever in Drive range.
  4. Verify the scan tool Transmission Fluid Pressure Switch 4 parameter displays the correct states when allowing the transmission to shift from 1 through 6 gears. Refer to Transmission Fluid Pressure Switch Logic for the correct gear range states.
    • If the correct states are not displayed 

      Refer to Circuit/System Testing.

    • If the correct states are displayed 
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  6. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • If the DTC does not set 
  7. All OK.
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