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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1369 (Engine Controls And Fuel - 6.6L - DTC P0016 To DTC P02E7) >> DTC P0087 or P0088 >> Circuit/System Testing >> P0087

Circuit/System Testing: P0087

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. If DTC P0090, P0168 or P0191 is also set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  2. Ignition ON for 90 seconds, verify the scan tool FRP Regulator Command parameter is less than 20 percent.
    • If greater than the specified range, replace the ECM.
  3. Attempt to start the engine.
  4. Install the CH-48027  to the fuel rail service port and slowly increase the engine speed until reaching wide open throttle (WOT). The value should be between 1-4 inches Hg vacuum.
    • If more than the specified value, inspect for restricted fuel filter or damaged supply lines.
    • If no restriction was found, test for high fuel return flow. Refer to Fuel System Diagnosis - High Pressure Side .
  5. With the engine idling or at an idle, command the fuel pressure control to 180 MPa (26,106 psi) with a scan tool. Observe the Actual Fuel Rail Pressure parameter. The actual fuel pressure should be the same as the commanded pressure.
    6. IMPORTANT: If the fuel temperature is near 121°C (250°F) during the duplication of the complaint, or in the Failure Records for this DTC, inspect for a restriction in the fuel cooler air flow or the fuel heater always ON. Refer to Fuel Heater Always On .
  6. Operate the vehicle within the conditions for which the customer complaint occurs while observing the CH-48027  . You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records.
    • If the vacuum was more than 12 inches Hg of vacuum at any time in the operating range, inspect for kinked or restricted fuel supply lines.
  7. Operate the vehicle within the conditions for which the customer complaint occurred. Observe the Actual fuel Rail Pressure and Desired Fuel rail Pressure parameters with a scan tool. Fuel pressures should be the same for both parameters.
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