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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 2.0L - DTCS B1810-00 To P0111-00 >> DTC Troubleshooting >> P008A-00-Low Pressure Fuel System Pressure - Too Low >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR ANY SERVICE BULLETINS OR PCM SOFTWARE UPDATES 
    1. Check for any applicable Service Bulletins or Flash updates related to the DTC.

      Are there any applicable Service Bulletins or Flash updates?

      Yes 

      No 

      • Go To  2
  2. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN 
    NOTE:

    Verify there is fuel in 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  3

      No 

  3. CHECK FOR OTHER DTCS 
    1. Refer to the recorded DTCs.

      Are there any Fuel Pressure Sensor or 5 Volt Supply Reference DTCs present?

      Yes 

      No 

      • Go To  4
  4. CHECK THE (F855) 5 VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the Fuel Pressure Sensor harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (F856) 5-Volt Supply circuit at the Fuel Pressure Sensor harness connector.

      Does the voltage read approximately 5.0 volts?

      Yes 

      • Go To  5

      No 

      • Repair the (F856) 5-Volt Supply circuit for an open or short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE (K181) FUEL PRESSURE SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Measure the resistance of the (K181) Fuel Pressure Signal circuit between the Fuel Pressure Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (K181) Fuel Pressure Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK THE (K917) SENSOR GROUND FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K917) Sensor Ground circuit between the Fuel Pressure Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (K917) Sensor Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK THE LOW PRESSURE FUEL SYSTEM 
    1. Connect all disconnected harness connectors.
    2. Perform the CHECKING THE LOW PRESSURE FUEL SYSTEM diagnostic procedure. Refer to CHECKING THE LOW PRESSURE FUEL DELIVERY SYSTEM .

      Is the Low Pressure Fuel System operating properly?

      Yes 

      • Replace the Fuel Pressure Sensor in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

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