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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 5.3L (L84) Or 6.2L (L87) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P06DA-P06DD (L87) >> Circuit/System Verification

Circuit/System Verification

NOTE:

The engine oil level and condition is critical to the correct operation of the system.

  1. Ignition - On/Vehicle - In Service Mode
  2. Verify there are no DTCs set related to the following component/system:
    • B35 Engine Oil Level Switch
    • B37B Engine Oil Pressure Sensor
    • Go to next step: If no other DTCs are set 
  3. Verify the condition does not exist: Engine Oil - Contaminated/Dirty/Fill Level = Low
    • If a condition exists 

      Repair as necessary

    • Go to next step: If no condition exists 
  4. Perform the scan tool control function: Engine Oil Pressure Control Valve - High Pressure & Low Pressure

    Verify the scan tool parameter:

    • Engine Oil Pressure Control Valve Control Circuit High Test Status = Not Run or Okay
    • Engine Oil Pressure Control Valve Control Circuit Low Test Status = Not Run or Okay
    • Engine Oil Pressure Control Valve Control Circuit Open Test Status = Not Run or Okay
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  5. Engine - Running
  6. Perform the following steps:
    1. Increase the engine speed slowly to 1, 800 RPM.
      2. NOTE:

      Using the scan tool line graph function may make it easier to identify if the value changes.

    2. Perform the scan tool control function: Engine Oil Pressure Control Valve - High Pressure

      Verify the scan tool parameter: Engine Oil Pressure = Change is greater than 30 kPa (4 PSI)

      • If the change is 30 kPa (4 PSI) or less - Replace the component: Q44 Engine Oil Pressure Control Solenoid Valve
      • Go to next step: If the change is greater than 30 kPa (4 PSI)
  7. 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 
  8. All OK.
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