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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (4 Of 5)) >> Diagnostic Information and Procedures >> DTC P2006, P20F8, or P295A >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Engine - Idling
  2. Perform the scan tool control function: Intake Manifold Runner Control Valve - Increase & Decrease

    Perform the action while monitoring the parameter:

    • Intake Manifold Runner Control Valve Control Circuit High Test Status = Not Run or Okay
    • Intake Manifold Runner Control Valve Control Circuit Low Test Status = Not Run or Okay
    • Intake Manifold Runner Control Valve Control Circuit Open Test Status = Not Run or Okay
    • Intake Manifold Runner Control Valve Control Circuit Shorted Test Status = Not Run or Okay
    • 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: Intake Manifold Runner Control Valve - Increase & Decrease

    Perform the action while monitoring the parameter: Intake Manifold Runner Control Valve Position Variance

  4. Verify the scan tool parameter: Intake Manifold Runner Control Valve Position Variance = Less than 10%
    • If 10% or greater 

      Refer to: Circuit/System Testing

    • Go to next step: If less than 10%
  5. Ignition Off - For greater than 1 min
  6. Ignition - On/Vehicle - In Service Mode
  7. Verify the scan tool parameter: Intake Manifold Runner Control Valve Position Variance = Less than 10%
    • If 10% or greater 

      Refer to: Circuit/System Testing

    • Go to next step: If less than 10% 
  8. 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 does not set 
  9. All OK.