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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (2 Of 5)) >> Diagnostic Information and Procedures >> DTC P0234 or P0299 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On/Vehicle - In Service Mode
  2. Verify DTC P003A, P0045 - P0048, P0071 - P0074, P00C7, P0106 - P0108, P0116 - P0119, P0128, P02E1, P02E8, P02E9, P111E, P122D, P169E, P169F, P16FA, P16FC, P2227 - P2230, U0654, U0656 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Verify the scan tool parameter: MAP Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure
    • Go to next step: If in the specified range 
  4. Engine - Idling - At normal operating temperature.
  5. Verify the scan tool parameter: MAP Sensor = The value should change with accelerator pedal input.
    • Go to next step: If the value changes 
  6. Perform the scan tool control function: Turbocharger Vane Position - Increase & Decrease

    Verify the scan tool parameter: Turbocharger Vane Position Sensor = Desired Turbocharger Vane Position

    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  7. Verify the scan tool parameter: Induction System Leak Indication = 0.75: 1 to 1.25: 1 - Stable
    • If not in the specified range 

      Refer to: Circuit/System Testing

    • Go to next step: If in the specified range 
  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.