LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1044 (Engine Controls And Fuel - 4.8L, 5.3L, 6.0L, 6.2L, Or 7.0L - DTC P0010 To DTC P0230) >> DTC P0191 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, all accessories OFF, install a CH-48027  . See Special Tools . Refer to Fuel Pressure Gage Installation and Removal .
  2. Ignition ON, command the Fuel Pump Flow Control Module Fuel Pump ON and OFF several times with the scan tool.
  3. Verify the CH-48027 Digital Pressure Gauge is greater than 275 kPa (40 PSI). If less the 275 kPa (40 PSI), refer to FUEL SYSTEM DIAGNOSIS (W/FPCM) .
  4. Engine at idle, with a scan tool increase and decrease the Fuel Pump Flow Control Module Fuel Pressure Control.
  5. Verify the scan tool Fuel Pressure Sensor display is within 20 kPa (3 PSI) of the CH-48027 Digital Pressure Gauge.
    • If not within 20 kPa (3 PSI), refer to Circuit/System Testing  .
    • If within 20 kPa (3 PSI) and the Fuel Pump Flow Control Module Fuel Pump Signal Command is 100%, replace the fuel pump flow control module.
scientia non olet · About LEMON Manuals