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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls And Fuel - 2.0L (LUZ) Diesel - DTC P0016 To DTC P0406) >> Diagnostic Information and Procedures >> DTC P0191: Fuel Rail Pressure Sensor >> Circuit/System Testing >> Post Drive Mode Testing

Post Drive Mode Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF.
  2. Open a fuel injector high pressure fuel line.
  3. Ignition ON.
  4. Verify the scan tool Fuel Rail Pressure Sensor Voltage parameter is between 0.42 and 0.61 V.
    • If less than 0.42 V 

      Test the B47B Fuel Rail Pressure Sensor Signal circuit terminal 2 and the Fuel Rail Pressure Sensor 5 Volt Reference circuit terminal 3 for high resistance. If the circuits tests normal, replace the B47B Fuel Rail Pressure Sensor.

    • If greater than 0.61 V 

      Test B47B Fuel Rail Pressure Sensor Low Reference circuit terminal 1 for high resistance. If the circuit tests normal, replace the B47B Fuel Rail Pressure Sensor.

    • If between 0.42 and 0.61 V 
  5. Install the fuel injector high pressure line.
  6. Engine running for 2 minutes.
  7. Ignition OFF, wait 30 s.
    NOTE: Contaminated fuel could cause Q18B Fuel Pressure Regulator 2 to hold rail pressure during key OFF.
  8. Verify the scan tool Fuel Rail Pressure Sensor Voltage parameter is less than 0.61 V.
    • If greater than 0.61 V 

      Replace the Q18B Fuel Pressure Regulator 2.

    • If less than 0.61 V 
  9. Refer to Diagnostic Aids .
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