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Home >> Cadillac >> 2010 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System & Fuel System - 5.3L, 6.0L, 6.2L - Troubleshooting & Diagnosis >> Fuel System Diagnosis (FPCM) >> Circuit/System Verification
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Circuit/System Verification

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 550 kPa = / -5 % (80 psi ±5 %).
  1. Ignition OFF, all accessories OFF, install a CH-48027  . See Special Tools . 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 345-414 kPa (50-60 psi) and does not decrease more than 34 kPa (5 psi) in 1 minute.
  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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