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Home >> Chevrolet >> 2020 >> Trax LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.8L (2H0) >> Diagnostic Information and Procedures >> Fuel System Diagnosis >> Circuit/System Testing

Circuit/System Testing

Fuel Pressure Low

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

      Repair as necessary.

    • Go to next step: If none of the conditions exist 

      Go to next step: Replace the G12 Fuel Pump.

Fuel Pressure Leaks Down

  1. Ignition OFF, relieve the fuel pressure. Refer to Fuel Pressure Relief .
  2. Install the EN 37287  Adapter between the chassis fuel feed hose and the engine compartment fuel feed pipe.
  3. Open the valve on the EN 37287  Adapter.
  4. Ignition ON, command the Fuel Pump Relay On with a scan tool and bleed the air from the CH 48027  Gauge or the EN 34730-91  Pressure Tester.
  5. Command the Fuel Pump Relay On and then Off with a scan tool.
  6. Close the valve on the EN 37287  Adapter.
  7. Verify that the fuel pressure does not decrease more than 34 kPa (5 psi) in 1 min.
    • If greater than 34 kPa (5 psi) 

      Locate and replace the leaking Q17 Fuel Injector.

    • Go to next step: If less than 34 kPa (5 psi) 

      Go to next step: Replace the G12 Fuel Pump.

Fuel Pressure Drops Off

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

      Repair as necessary.

    • Go to next step: If none of the conditions exist 

      Go to next step: Replace the G12 Fuel Pump.

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