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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 Testing

Circuit/System Testing

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    NOTE:

    You must perform the Circuit/System Verification first.

  1. Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
  2. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  3. Connect the DT - 47825-10  jumper harness between the vehicle wire harness electrical connector, and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  4. Verify the scan tool parameters listed below change states when gently pushing on each Transmission Fluid Pressure Switch with the eraser end of a pencil.
    • Transmission Fluid Pressure Switch 1
    • Transmission Fluid Pressure Switch 3
    • Transmission Fluid Pressure Switch 4
    • Transmission Fluid Pressure Switch 5
    • If any parameter does not change 

      Replace the Q8 Control Solenoid Valve Assembly.

    • If all parameters change 
  5. Verify the channel plate, spacer plate, and filter plate do not have a restricted or blocked orifice. Repair or replace as necessary.
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