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Home >> Chevrolet >> 2015 >> Camaro LS, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Controls And Fuel - 6.2L (L99 LS3 LSA) Or 7.0L (LS7) - DTC P0335 To DTC P3449 And Diagnostic Information And Procedures) >> 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, unless instructed here from a DTC 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 may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.
  • Before proceeding with this test review the User Manual CH 48027-5 for Safety Information and Instructions.
  1. Ignition OFF, all accessories OFF, install a CH-48027  digital pressure gauge. Refer to Fuel Pressure Gauge Installation and Removal .
  2. Ignition ON, engine OFF, command the Fuel Pump Enable ON with a scan tool.
  3. Verify the fuel pressure is between 345-414 kPa (50-60 psi) and does not decrease more than 34 kPa (5 psi) in 1 min.
    • If greater than the 414 kPa (60 psi) 

      Replace the G12 Fuel Pump.

    • If less than 345 kPa (50 psi) 

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

    • If within the specified value 
    4. 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.

  4. Verify that the fuel pressure does not decrease greater than 34 kPa (5 psi) in 1 minute.
    • 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. Relieve the fuel pressure to 69 kPa (10 psi), refer to Fuel Pressure Relief .
  6. Verify that the fuel pressure does not decrease greater than 14 kPa (2 psi) in 5 minutes.
    • If the fuel pressure decreases greater than 14 kPa (2 psi) 

      Replace the G12 Fuel Pump.

    • If the fuel pressure does not decrease greater than 14 kPa (2 psi) 
    7. 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.

  7. Operate the vehicle within the conditions of the customer's concern while monitoring the fuel pressure with the CH-48027  Digital Fuel Pressure Gauge.
  8. 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.

    • If the fuel pressure does not drop off 
  9. If the fuel system components test normal, refer to Symptoms - Engine Controls (L99, LS3, LS7) Symptoms - Engine Controls (LSA) , and Fuel Injector Diagnosis Fuel Injector Diagnosis (LSA) .
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