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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 897 (Engine Controls And Fuel - 4.8L, 5.3L, 6.0L And 6.2L - Diagnosis & Troubleshooting) >> Fuel System Diagnosis (with LMG, LC9, or LY6) >> Circuit/System Description - Non Fuel System Control Module (FSCM) >> Circuit/System Verification

Circuit/System Verification

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    IMPORTANT:
    • 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 ON, command the fuel pump relay ON with a scan tool. You should hear the fuel pump turn ON and OFF.
  2. Ignition OFF, all accessories OFF, install the CH-48027  . See Special Tools . Refer to Fuel Pressure Gage Installation and Removal .
  3. Ignition ON, command the fuel pump relay ON with a scan tool. Verify the fuel pressure is between 345-414 kPa (50-60 psi) and remains steady for 5 minutes.
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