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Home >> Cadillac >> 2019 >> XTS Base >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6T70 (M7U M7W), 6T75 (M7V), Or 6T80 (Mhm) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0658 or P0659 >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    You must perform the Circuit/System Verification first.

  1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
  2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris. Refer to Control Solenoid Valve and Transmission Control Module Assembly Inspection 
    • If contaminated 

      Repair as necessary

    • Go to next step: If not contaminated 
  3. Verify the resistance is within the specified range for each solenoid listed in the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
    • If the resistance is not within range 

      Replace the Q8 Control Solenoid Valve Assembly.

    • Go to next step: If the resistance is within range 
  4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
  5. Connect the DT 47825-20  adapter harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
  6. Verify the scan tool parameters listed below do not display Malfunction:
    • High Side Driver 1 Circuit Low Voltage Test Status
    • High Side Driver 1 Circuit Open Test Status
    • High Side Driver 1 Circuit High Voltage Test Status
    • If Malfunction is displayed 

      Replace the Q8 Control Solenoid Valve Assembly.

    • Go to next step: If Malfunction is not displayed 
  7. All OK.
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