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Home >> Chevrolet >> 2022 >> Camaro LS, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 30 (Engine Controls And Fuel - 6.2L (LT1/LT4) - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> Fuel System Diagnosis >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
NOTE:
  • Repair all fuel system related DTCs before performing this diagnostic.
  • Inspect the fuel system for damage or external leaks before proceeding.
  • Verify that adequate fuel is in the fuel tank before proceeding.
  • The scan tool Fuel Pump Enable control function may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.
  • DO NOT perform the Fuel System Diagnosis if the engine coolant temperature is above 60°C (150°F). High fuel pressure readings may result due to hot soak fuel boiling. With the engine OFF, the fuel pressure may increase beyond the pressure relief regulator valve's setting point of 690 kPa (100 PSI) ± 5 %.
  1. Ignition - On/Vehicle - In Service Mode
  2. Perform the following procedure/test: Fuel Pressure Relief
  3. Verify the scan tool parameter: Fuel Pressure Sensor = Less than 83 kPa (12 PSI)
    • If greater than 83 kPa (12 PSI) 

      Replace the component: B47 Fuel Pressure Sensor

    • Go to next step: If less than 83 kPa (12 PSI) 
  4. Perform the scan tool control function: Fuel Pump Enable - On - Command the function On several times.
  5. Verify the scan tool parameter: Fuel Pressure Sensor = 320 to 608 kPa (46 to 88 PSI)
    • If less than 320 kPa (46 PSI) 

      Refer to Circuit/System Testing - Fuel Pressure Low.

    • If greater than 607 kPa (88 PSI) 

      Test or replace the component: G12 Fuel Pump

    • Go to next step: If between 320 - 608 kPa (46 - 88 PSI) 
    6. NOTE:

    The fuel pressure may vary slightly when the fuel pump stops operating. After the fuel pump stops operating, the fuel pressure should stabilize and remain constant.

  6. Verify the fuel pressure decreases to 468 - 544 kPa (68 - 79 PSI) after the fuel pump is turned Off.
    • If the fuel pressure does not decrease to 468 - 544 kPa (68 - 79 PSI) 

      Replace the G12 Fuel Pump.

    • Go to next step: If the fuel pressure decreases to 468 - 544 kPa (68 - 79 PSI) 
  7. Verify the fuel pressure does not decrease greater than 34 kPa (5 PSI) in 1 min.
    • If the fuel pressure decreases greater than 34 kPa (5 PSI) 

      Refer to Circuit/System Testing - Fuel Pressure Leaks Down.

    • Go to next step: If the fuel pressure does not decrease greater than 34 kPa (5 PSI) 
  8. Relieve the fuel pressure to 69 kPa (10 PSI), refer to Fuel Pressure Relief .
  9. Verify the fuel pressure does not decrease greater than 14 kPa (2 PSI) in 5 min.
    • If the fuel pressure decreases greater than 14 kPa (2 PSI) 

      Replace the G12 Fuel Pump.

    • Go to next step: If the fuel pressure does not decrease greater than 14 kPa (2 PSI) 
    10. WARNING:

    Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.

  10. Operate the vehicle within the conditions of the customer's concern while monitoring the scan tool Fuel Pressure Sensor parameter.
  11. Verify the fuel pressure does not drop off during acceleration, cruise or hard cornering.
    • If the fuel pressure drops off 

      Refer to Circuit/System Testing - Fuel Pressure Drops OFF.

    • Go to next step: If the fuel pressure does not drop off 
  12. If the fuel system components test normal, refer to Symptoms - Engine Controls (LT4) Symptoms - Engine Controls (LT1) , and Fuel Injector Diagnosis  for further diagnosis.
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