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Home >> Chevrolet >> 2010 >> Traverse LT, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 510 (Engine Controls And Fuel - 3.6L (LLT) - DTC P0340 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Fuel System Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

Fuel Pressure Low

  1. Verify none of the conditions listed below exist:
    • Restricted fuel feed pipe
    • Restricted or plugged strainer
    • Inspect the harness connectors and the ground circuits of the fuel pump for poor connections.
    • If a condition exist 

      Repair as necessary.

    • If a condition does not exist 
  2. Test or replace the G12 Fuel Pump.

Fuel Pressure Leaks Down

  1. Ignition OFF, relieve the fuel pressure. Refer to Fuel Pressure ReliefFuel Pressure Relief (High Side) .
  2. Install the J-37287-FF  Fuel Line Shut-Off Adapters between the fuel feed pipe and the fuel rail.
  3. Open the valve on the J-37287-FF  Fuel Line Shut-Off Adapters.
  4. Ignition ON, command the Fuel Pump Enable On with a scan tool.
  5. Close the valve on the J-37287-FF  Fuel Line Shut-Off Adapters.
  6. Verify the Fuel Pressure Sensor parameter does not decrease greater than 34 kPa (5 PSI) in 1 min.
    • If the fuel pressure drops 

      Replace the G12 Fuel Pump.

    • If the fuel pressure does not drop 
  7. Locate and replace the leaking Q17 Fuel Injector.

Fuel Pressure Drops OFF

  1. Verify none of the conditions listed below exist:
    • Restricted fuel feed pipe
    • Restricted or plugged strainer
    • Inspect the harness connectors and the ground circuits of the fuel pump for poor connections.
    • If a condition exist 

      Repair as necessary.

    • If a condition does not exist 
  2. Test or replace the G12 Fuel Pump.
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