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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1646 (Engine Control System & Fuel System - 4.8L, 5.3L, 6.0L, 6.2L - Troubleshooting And Diagnosis) >> Fuel System Diagnosis (FPCM) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Repair all fuel system related DTCs before performing this diagnostic, unless instructed here from a DTC 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 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 a CH-48027  . Refer to Fuel Pressure Gauge Installation and Removal .
  2. Ignition ON, engine OFF, command the 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 ON with the engine idling at normal operating temperature, the Fuel Rail Pressure Sensor parameter should read between 296.4-310.3 kPa (43-45 psi).
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