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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 Testing

Circuit/System Testing

NOTE: Fuel pressure control will be disable if DTC P0087, P0088, P0192, or P0193 are set. Codes must be cleared to enable the device control.
  1. Turn OFF the ignition.
  2. Disconnect the ECM connector and the fuel pressure regulator connector.
  3. Test the fuel pressure regulator solenoid supply voltage circuit for a short to voltage.
  4. Disconnect the FRP sensor.
  5. Test the FRP signal circuit, the 5-volt reference circuit, and the low reference circuit for high resistance.
    • If all circuits test normal, replace the FRP sensor.
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