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Home >> Buick >> 2019 >> Regal TourX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 139 (Engine Controls And Fuel - 3.6L (LGX) - Diagnostic Information And Procedures (P0449-P3436) And Symptoms) >> Diagnostic Information and Procedures >> DTC P25CA-P25CF >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    Verify the engine has the correct oil level and the correct oil pressure before continuing with this diagnostic.

  1. Engine Running
  2. Perform the appropriate scan tool control function: Intake Camshaft Position Actuator Park Lock Test - On/Off

    Verify the scan tool parameter:

    • Intake Camshaft Position Actuator Park Lock Solenoid Valve Control Circuit High Voltage Test Status Bank 1, 2 = OK or Not Run
    • Intake Camshaft Position Actuator Park Lock Solenoid Valve Control Circuit Low Voltage Test Status Bank 1, 2 = OK or Not Run
    • Intake Camshaft Position Actuator Park Lock Solenoid Valve Control Circuit Open Test Status Bank 1, 2 = OK or Not Run
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  3. Perform the appropriate scan tool control function: Intake Camshaft Position Actuator Park Lock Test - Enable/OK

    Verify the scan tool parameter:

    • Intake Camshaft Position Actuator Park Lock Solenoid Valve Control Circuit High Voltage Test Status Bank 1, 2 = OK or Not Run
    • Intake Camshaft Position Actuator Park Lock Solenoid Valve Control Circuit Low Voltage Test Status Bank 1, 2 = OK or Not Run
    • Intake Camshaft Position Actuator Park Lock Solenoid Valve Control Circuit Open Test Status Bank 1, 2 = OK or Not Run

      Perform the action while monitoring the parameter:

    • Wiggle the harness and connector: Q84 Camshaft Position Actuator Park Lock Solenoid Valve
    • Wiggle the harness and connector: K20 Engine Control Module
    • If not the specified state 

      Repair as necessary - Wiring / Terminal (s) / Electrical Connector (s)

    • Go to next step: If the specified state 
  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.
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