LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (2.9L Pcm 1 - DTCS P0351-00 To P06DB-00) >> DTC Troubleshooting >> P062A-00-Fuel Pump A Control Circuit Range/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 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  2

      No 

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

      Are there any Fuel Pressure Sensor or Fuel Pump Control Module DTCs present?

      Yes 

      • Perform the applicable diagnostic procedure(s). Refer to DTC INDEX .

      No 

      • Go To  3
  3. CHECK THE FUEL SYSTEM FOR LEAKS 
    1. Visually inspect the low pressure fuel system for signs of a fuel leak.

      Were any fuel leaks found in the system?

      Yes 

      No 

      • Go To  4
  4. CHECK THE FUEL DELIVERY SYSTEM PRESSURE AND FUEL RAIL PRESSURE SENSOR 
    1. Perform the diagnostic procedure for CHECKING THE FUEL DELIVERY SYSTEM. Refer to CHECKING THE LOW PRESSURE FUEL DELIVERY SYSTEM .
    2. Monitor the Fuel Rail Pressure Sensor 1 value on the scan tool during the fuel pressure test.
    3. Compare the actual fuel pressure reading from the fuel pressure gauge to the Fuel Rail Pressure Sensor 1 value on the scan tool.

      Did the Fuel Rail Pressure Sensor 1 value match the reading the fuel pressure gauge?

      Yes 

      • Go To  5

      No 

      • Go To  6
  5. REPLACE THE LOW PRESSURE FUEL PUMP MODULE AND RETEST FOR DTCS 
    1. Replace the Fuel Pump Module in accordance with the Service Information.
    2. Connect the FPCM, Fuel Pump Module and PCM-1 harness connectors.
    3. Turn the ignition on.
    4. With the scan tool, erase DTCs.
    5. Using the recorded Freeze Frame and the When Monitored conditions, operate the vehicle in the conditions that set the DTC.
    6. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Replace the Fuel Pump Control Module in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

  6. CHECK FOR HIGH RESISTANCE IN THE (K181) FUEL PRESSURE SIGNAL CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the Fuel Pressure Sensor harness connector.
    3. Disconnect both PCM-1 C2 harness connector.
    4. Measure the resistance of the (K181) Fuel Pressure Signal circuit between the Fuel Pressure Sensor harness connector and the PCM-1 C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (K181) Fuel Pressure Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK FOR HIGH RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT 
    1. Measure the resistance of the (F855) 5-Volt Supply circuit between the Fuel Pressure Sensor harness connector and the PCM-1 C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  8

      No 

      • Repair the (F855) Sensor Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. CHECK FOR HIGH RESISTANCE IN THE (K917) SENSOR GROUND CIRCUIT 
    1. Measure the resistance of the (K917) Sensor Ground circuit between the Fuel Pressure Sensor harness connector and the PCM-1 C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  9

      No 

      • Repair the (K917) Sensor Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. CHECK THE ABILITY OF THE PCM-1 TO READ THE FUEL PRESSURE SENSOR SIGNAL 
    1. Turn the ignition off.
    2. Reconnect the PCM-1 harness connectors.
    3. Turn the ignition on.
    4. With the scan tool, read DTCs.
    5. While monitoring scan tool, connect a jumper between the (K181) Fuel Pressure Signal circuit and the (K917) Sensor Ground circuit at the FRPS harness connector.
      NOTE:

      The PCM should display the DTC P2542-00-LOW PRESSURE FUEL SYSTEM SENSOR CIRCUIT HIGH DTC with the connector unplugged and P2541-00-LOW PRESSURE FUEL SYSTEM SENSOR CIRCUIT LOW with the jumper in place.

      Does the scan tool display the DTCs as described above?

      Yes 

      No 

      • Go To  10
  10. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all PCM-1 harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    6. Reconnect all PCM-1 harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
    10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    11. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

scientia non olet · About LEMON Manuals