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Home >> Chevrolet >> 2006 >> Chevy Express G2500, Van Cargo Extended, 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 6.6L (LLY) - DTC P0016 To DTC P0342 >> DTC P0191 - P0193 >> Circuit/System Testing

Circuit/System Testing

IMPORTANT: Fuel pressure control will be disable if DTC P0087, P0088, P0912, or P0193 are set. Codes must be cleared to enable the device control.

P0191

  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.

P0192

  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the FRP connector and observe the Actual Fuel Pressure parameter with a scan tool.
    • If fuel pressure is 0 MPa (0 psi), test the FRP sensor signal circuit for a short to ground or a faulty ECM.
    • If fuel pressure is 200 MPa (29,00 psi), replace the FRP sensor.

P0193

  1. Turn ON ignition, with the engine OFF.
  2. Disconnect the FRP sensor connector and probe the signal circuit with a test lamp connected to ground.
    • If the test lamp illuminates, test the signal circuit for a short to voltage or a faulty ECM.
  3. Connect a DMM between the FRP 5-volt reference circuit and ground, and measure the voltage.
    • If the voltage is not 0.254-4.75 volts, test for an open in the 5-volt reference circuit or a faulty ECM.
  4. Connect a fused jumper between the FRP signal circuit and the low reference circuit and observe the actual fuel rail pressure parameter with a scan tool.
    • If fuel pressure goes to 0 MPa, replace the FRP sensor.
    • If fuel pressure does not go to 0 MPa, test the signal circuit and the low reference circuit for an open or a faulty ECM.
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