Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 2009 >> Chevy Express G2500, Van Cargo Extended, 6.6 6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 6.6L LMM - DTC P0016 To DTC P02E0 >> DTC P0191 >> Circuit/System Verification

Circuit/System Verification

NOTE:
  • You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  • If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
  1. If any other DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  2. Observe the Fuel Rail Pressure Sensor parameter with a scan tool. During engine cranking, the pressure should be at least 10 MPa. With the engine running at idle, the pressure should be close to the Desired Fuel Rail Pressure. As the engine speed increases, the Desired Fuel Rail Pressure and the Actual Fuel Rail Pressure should closely match each other.
  3. Engine running, observe the DTC information with a scan tool. DTC P0191 should not set.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
scientia non olet · About Mike's Workshop Manuals