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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 364 (Engine Controls And Fuel - 5.3L, 6.0L & 6.2L - DTC P0443 Through DTC P3449 And Troubleshooting) >> Diagnostic Information and Procedures >> Fuel System Diagnosis (FPCM) >> Circuit/System Verification

Circuit/System Verification

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NOTE:
  • Repair all fuel system related DTCs before performing this diagnostic, unless instructed here from a DTC.
  • 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.
  • DO NOT perform the Fuel System Diagnosis if the engine coolant temperature is above 60°C (150°F). High fuel pressure readings may result due to hot soak fuel boiling. With the engine OFF, the fuel pressure may increase beyond the pressure relief valves set point of 690 kPa ±5 % (100 psi ±5 %).
  1. Ignition OFF, all accessories OFF, install the CH-48027  Digital Pressure Gauge. Refer to Fuel Pressure Gauge Installation and Removal .
  2. Ignition ON, engine OFF, command the FPCM Fuel Pump ON with a scan tool. Verify the fuel pressure is between 345-690 kPa (50-100 psi) with the pump running.
  3. Engine idling at the normal operating temperature, Verify the FPCM scan tool Fuel Rail Pressure Sensor parameter is between 296-310 kPa (43-45 psi).
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