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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 514 (Engine Controls/Fuel - Hybrid (LZ1) - DTC P0351 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Fuel System Diagnosis >> Circuit/System Verification

Circuit/System Verification

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    IMPORTANT:
    • 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 relay 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, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description .
  2. Ignition ON, verify the scan tool hood position parameter displays OPEN.
  3. Ignition OFF, all accessories OFF, install the CH-48027  fuel pressure gauge. Refer to Fuel Pressure Gauge Installation and Removal .
  4. Ignition ON, command the fuel pump Enable ON with a scan tool. Verify the fuel pressure is between 345-414 kPa (50-75 psi) and remains steady for 5 minutes.
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