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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (2.9L Pcm 2 - DTCS P2240-00 To U143B-00) >> DTC Troubleshooting >> P2371-00-Fuel Volume Regulator B Control Circuit Performance >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    Verify there is fuel on the fuel tank before continuing with this test procedure.

    1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
    3. With the scan tool, erase all DTCs.
    4. Turn the ignition off for a minimum of 10.0 seconds.
    5. Turn the ignition on.
    6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    7. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

  2. CHECK THE HIGH PRESSURE FUEL SYSTEM FOR A SIGNS OF A LEAK 
    NOTE:

    Do not run the engine when inspecting the high pressure fuel system for leaks. The system pressure can be extremely high.

    1. Visually inspect for signs of fuel leaks at the high pressure fuel tube and Fuel Injectors.

      Are any leaks present?

      Yes 

      • If the leak appears to be at the high pressure fuel tube, verify that the tube is torqued correctly. If the torque is correct, replace the high pressure fuel tube in accordance with the Service Information. If the leak appears to be at a Fuel Injector, perform the appropriate repair in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE LOW FUEL PRESSURE SYSTEM FOR PROPER OPERATION 
    1. Perform the CHECKING THE LOW PRESSURE FUEL SYSTEM test procedure. Refer to DIAGNOSIS AND TESTING .

      Were any issues found?

      Yes 

      No 

      • Go To  4
  4. CHECK FOR HIGH RESISTANCE IN THE (K162) FUEL PRESSURE 2 SIGNAL CIRCUIT 
    1. Disconnect the Fuel Rail Pressure (FRP) Sensor 2 harness connector.
    2. Disconnect the PCM-2 C2 harness connector.
    3. Measure the resistance of the (K162) Fuel Pressure 2 Signal circuit between the FRP Sensor 2 harness connector and the PCM-2 C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the high resistance in the (K162) Fuel Pressure 2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK FOR HIGH RESISTANCE IN THE (K852) 5-VOLT SUPPLY CIRCUIT 
    1. Measure the resistance of the (K852) 5-Volt Supply circuit between the FRP Sensor 2 harness connector and the PCM-2 C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the high resistance in the (K852) 5-Volt Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK FOR HIGH RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT 
    1. Measure the resistance of the (K900) Sensor Ground circuit between the FRP Sensor 2 harness connector and the PCM-2 C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the high resistance in the (K900) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK FOR HIGH RESISTANCE IN THE (G123) FUEL QUANTITY SOLENOID 2 SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the Fuel Quantity Solenoid 2 harness connector.
    3. Disconnect the PCM-2 C2 harness connector.
    4. Measure the resistance of the (G123) Fuel Quantity Solenoid 2 Supply circuit between the Fuel Quantity Solenoid 2 harness connector and the PCM-2 C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  8

      No 

      • Repair the (G123) Fuel Quantity Solenoid 2 Supply circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. CHECK FOR HIGH RESISTANCE IN THE (K923) FUEL QUANTITY SOLENOID 2 RETURN CIRCUIT 
    1. Measure the resistance of the (K923) Fuel Quantity Solenoid 2 Return circuit between the Fuel Quantity Solenoid 2 harness connector and the PCM-2 C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  9

      No 

      • Repair the (K923) Fuel Quantity Solenoid 2 Return circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. REPLACE THE FUEL RAIL PRESSURE SENSOR 2 AND RETEST FOR DTC 
    1. Replace the Fuel Rail Pressure Sensor 2 in accordance with the Service Information.
    2. Connect the FRP Sensor and PCM-2 C2 harness connectors.
    3. Turn the ignition on.
    4. With the scan tool, erase DTCs
    5. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    6. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Replace the left bank Fuel High Pressure Pump in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Replacing the Fuel Rail Pressure Sensor 2 repaired the fault.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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