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Home >> Chevrolet >> 2020 >> Camaro SS, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Engine Controls And Fuel - 2.0L (LTG) - Diagnostic Information And Procedures (P0010 - P0336)) >> Diagnostic Information and Procedures >> DTC P0236, P0237, or P0238 >> 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 P0641, P0651, P0697, P06A3, P06D2 is not set.
    • Go to next step: If none of the DTCs are set 
  3. If you were sent here from DTC P0068, P0101, P0106, P0121, P01101 - Refer to: Circuit/System Testing.
  4. Verify the scan tool parameter: Throttle Body Idle Air Flow Compensation Less than 90%
    • Go to next step: If less than 90% 
  5. Perform the scan tool control function: Throttle Sweep - Start

    Verify the scan tool parameter: Throttle Position Sensors 1 and 2 = Agree

    • Go to next step: If the specified state 
  6. Verify the scan tool parameter: BARO 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 
  7. Verify the following parameter is within 3 kPa (. 4 PSI) of the actual barometric pressure: MAP Sensor
    • Go to next step: If in the specified range 
  8. Engine - Idling - At normal operating temperature
  9. Verify the scan tool parameter: MAP Sensor = 26 to 52 kPa (3. 8 to 7. 5 PSI) - The value should change with accelerator pedal input.
    • Go to next step: If in the specified range and changes 
  10. Observe the scan tool parameter: MAF Sensor & Engine Speed.
  11. Increase the engine speed slowly to 3, 000 RPM and then back to idle.
  12. Verify the scan tool parameter: MAF Sensor = The value should change smoothly and gradually as the engine speed is increased and decreased.
    • If the value does not change smoothly and gradually 

      Refer to: DTC P0101 

    • Go to next step: If the value changes smoothly and gradually 
  13. Verify the following parameter is within 3 kPa (. 4 PSI) of the actual barometric pressure: Boost Pressure Sensor
    • If not in the specified range 

      Refer to: Circuit/System Testing

    • Go to next step: If in the specified range 
  14. Verify the following parameters are within 20 kPa (2. 9 PSI) of each other: - 1-2 Shift Time@Wide Open Throttle
    • MAP Sensor
    • Boost Pressure Sensor
    • If not within 20 kPa (2. 9 PSI) of each other 

      Refer to: Circuit/System Testing

    • Go to next step: If within 20 kPa (2. 9 PSI) of each other 
  15. 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 
  16. All OK.
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