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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 P171A-P171C >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Perform the scan tool control function: Transmission Accumulator Solenoid Valve - On and Off

    Verify the scan tool parameter:

    • Transmission Accumulator Solenoid Valve Control Circuit High Voltage Test Status = Not Run or OK
    • Transmission Accumulator Solenoid Valve Control Circuit Low Voltage Test Status = Not Run or OK
    • Transmission Accumulator Solenoid Valve Control Circuit Open Test Status = Not Run or OK
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  3. Perform the scan tool control function: Transmission Accumulator Solenoid Valve - On and Off

    Verify the component turns On and Off: Transmission Accumulator Solenoid Valve

    Verify the scan tool parameter: Transmission Accumulator Solenoid Valve Command = On and Off

    Verify a click can be heard or felt at the following component(s) when the scan tool control function was commanded: Transmission Accumulator Solenoid Valve

    • If the component does not turn On and Off 
    • If the parameter state does not change 
    • If a click cannot be heard or felt 

      Refer to: Circuit/System Testing

    • Go to next step: If the component turns On and Off 
    • Go to next step: If the parameter state changes 
    • Go to next step: If a click can be heard or felt 
  4. 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 
  5. All OK.