LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 2017 >> Camaro SS, 2D Convertible, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 3.6L (LGX) - DTC P0446 To DTC P3436 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Fuel System Diagnosis (Fuel Pump Power Control Module) >> Circuit/System Verification
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 Fuel Pump Enable 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 percent.
  1. Ignition ON, engine OFF, command the Fuel Pump Enable On several times with a scan tool.
  2. Verify the Fuel Pressure Sensor parameter is between 345-690 kPa (50-100 PSI) with the fuel pump running.
    • If less than 345 kPa (50 PSI) 

      Refer to Circuit/System Testing - Fuel Pressure Low.

    • If greater than 690 kPa (100 PSI) 

      Replace the G12 Fuel Pump.

    • If between 345-690 kPa (50-100 PSI) 
    3. 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.

  3. Verify that the Fuel Pressure Sensor parameter decreases to 500-599 kPa (72-87 PSI) after the fuel pump is turned off.
    • If the fuel pressure does not decrease to 500-599 kPa (72-87 PSI) 

      Replace the G12 Fuel Pump.

    • If the fuel pressure decreases to 500-599 kPa (72-87 PSI) 
  4. Verify the Fuel Pressure Sensor parameter 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.

    • If the fuel pressure does not decrease greater than 34 kPa (5 PSI) 
  5. Engine idling.
  6. Verify that the Fuel Pressure Sensor parameter is between 300-400 kPa (43-58 PSI)
    • If less than 300 kPa (43 PSI) 

      Refer to Circuit/System Testing - Fuel Pressure Low.

    • If greater than 400 kPa (58 PSI) 

      Replace the G12 Fuel Pump.

  7. Verify the scan tool Short Term Fuel Pump Trim and the Long Term Fuel Pump Trim when multiplied together are less than 1.5.
    • If greater than 1.5 

      Refer to Circuit/System Testing - Fuel Pressure Low.

    • If less than 1.5 
    8. 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.

  8. Verify the scan tool Fuel Pressure Sensor and the Desired Fuel Pressure are within 45 kPa (6.5 PSI) at 300 kPa (43.5 PSI) request or 60 kPa (8.7 PSI) at 400 kPa (58 PSI) request of each other while operating the vehicle through varying loads.
    • If greater than 45 kPa (6.5 PSI) / 60 kPa (8.7 PSI) 

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

    • If less than 45 kPa (6.5 PSI) / 60 kPa (8.7 PSI) 
  9. If the fuel system components test normal, refer to Symptoms - Engine Controls , Fuel Injector Solenoid Coil Test , and Fuel Injector Balance Test .
scientia non olet · About LEMON Manuals