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Home >> Cadillac >> 2017 >> Escalade ESV Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Engine Controls And Fuel - 6.0L (L96) - DTC P0351 To DTC P2636 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Fuel System Diagnosis >> Circuit/System Testing

Circuit/System Testing

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Fuel Pressure Low

  1. Verify none of the conditions listed below exist:
    • Restricted fuel feed pipe
    • Restricted or plugged strainer
    • Poor connections at the fuel pump harness connector and the ground circuits.
    • 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. Open the both valves on the CH - 37287 - 1A  Fuel Pressure Gauge Adapter.
  2. Ignition ON, command the Fuel Pump Enable ON with a scan tool.
  3. Close the valve between the gauge and fuel tank on the CH - 37287 - 1A  Fuel Pressure Gauge Adapter.
  4. Verify that the Fuel Rail Fuel Pressure parameter does not decrease greater than 34 kPa (5 psi) in 1 minute.
    • If the fuel pressure drops 

      Locate and replace the leaking Q17 Fuel Injector.

    • If the fuel pressure does not drop 
  5. Test or replace the G12 Fuel Pump.

Fuel Pressure Drops OFF

  1. Verify none of the conditions listed below exist:
    • Restricted fuel feed pipe
    • Restricted or plugged strainer
    • Poor connections at the fuel pump harness connector and the ground circuit.
    • 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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