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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 >> P0627-00-Fuel Pump Control Circuit Open >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE DTC 
    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 ASD/Main Relay or system voltage DTCs present?

      Yes 

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

      No 

      • Go To  3
  3. CHECK THE FUEL PUMP RELAY 
    1. Turn the ignition off.
    2. Install a known good relay in place of the existing Fuel Pump Relay.
    3. Using the recorded Freeze Frame Data and the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.

      Is the DTC active or pending?

      Yes 

      • Go To  4

      No 

  4. CHECK THE (K31) FUEL PUMP RELAY CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Remove the Fuel Pump Relay from the PDC.
    3. Disconnect the PCM-1 C1 harness connector.
    4. Measure the resistance of the (K31) Fuel Pump Control circuit between the Fuel Pump Relay connector in the PDC and the PCM-1 C1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (K31) Fuel Pump Relay Control circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK THE (K31) FUEL PUMP RELAY CONTROL CIRCUIT FOR A SHORT TO ANOTHER VOLTAGE SUPPLY 
    1. Check for continuity between the (K31) Fuel Pump Control circuit and all other circuits at the PCM-1 C1 harness connector.

      Is there continuity between the (K31) Fuel Pump Control circuit and any other circuit?

      Yes 

      • Repair the (K31) Fuel Pump Relay Control circuit for a short to the circuit that showed continuity.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK THE (N1) FUEL PUMP CONTROL OUTPUT CIRCUIT FOR A SHORT TO GROUND 
    1. Disconnect the FPCM harness connector.
    2. Check for continuity between ground and the (N1) Fuel Pump Control Output circuit at the Fuel Pump Relay connector in the PDC.

      Is there continuity between ground and the (N1) Fuel Pump Control Output circuit?

      Yes 

      • Repair the (N1) Fuel Pump Control Output circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK THE (N1) FUEL PUMP CONTROL OUTPUT CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (N1) Fuel Pump Control Output circuit between the Fuel Pump Relay connector in the PDC and the FPCM harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  8

      No 

      • Repair the (N1) Fuel Pump Control Output circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. CHECK THE (N211) FPCM PWM CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (N211) FPCM PWM Control circuit between the FPCM harness connector the PCM-1 C1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  9

      No 

      • Repair the (N211) FPCM PWM Control circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. CHECK THE (N13) FUEL PUMP FEED U CIRCUIT FOR A SHORT TO GROUND 
    1. Disconnect the Fuel Pump Module harness connector.
    2. Check for continuity between ground and the (N13) Fuel Pump Feed U circuit at the Fuel Pump Module harness connector.

      Is there continuity between ground and the (N13) Fuel Pump Feed U circuit?

      Yes 

      • Repair the (N13) Fuel Pump Feed U circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  10
  10. CHECK THE (N15) FUEL PUMP FEED V CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (N15) Fuel Pump Feed V circuit at the Fuel Pump Module harness connector.

      Is there continuity between ground and the (N15) Fuel Pump Feed V circuit?

      Yes 

      • Repair the (N15) Fuel Pump Feed V circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  11
  11. CHECK THE (N17) FUEL PUMP FEED W CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (N17) Fuel Pump Feed W circuit at the Fuel Pump Module harness connector.

      Is there continuity between ground and the (N17) Fuel Pump Feed W circuit?

      Yes 

      • Repair the (N17) Fuel Pump Feed W circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  12
  12. CHECK THE (N13) FUEL PUMP FEED U CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (N13) Fuel Pump Feed U circuit between the FPCM harness connector and the Fuel Pump Module harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  13

      No 

      • Repair the (N13) Fuel Pump Feed U circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  13. CHECK THE (N15) FUEL PUMP FEED V CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (N15) Fuel Pump Feed V circuit between the FPCM harness connector and the Fuel Pump Module harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  18

      No 

      • Repair the (N15) Fuel Pump Feed V circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  14. CHECK THE (N17) FUEL PUMP FEED W CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (N17) Fuel Pump Feed W circuit between the FPCM harness connector and the Fuel Pump Module harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  15

      No 

      • Repair the (N17) Fuel Pump Feed W circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  15. CHECK THE (N14) FUEL PUMP RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (N14) Fuel Pump Return circuit between the FPCM harness connector and the Fuel Pump Module harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  16

      No 

      • Repair the (N14) Fuel Pump Return circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  16. CHECK FOR THE FUEL PUMP MODULE FEED CIRCUITS SHORTED TO THE FUEL PUMP CONTROL OUTPUT CIRCUIT 
    1. Check for continuity between the Fuel Pump Feed circuits and the (N1) Fuel Pump Control Output circuit at the Fuel Pump Module harness connector.

      Is there continuity between any of the Fuel Pump Feed circuits and the (N1) Fuel Pump Control Output circuit?

      Yes 

      • Repair the short between the Fuel Pump Feed circuit and the (N1) Fuel Pump Control Output circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  17
  17. CHECK FOR THE FUEL PUMP MODULE FEED CIRCUITS SHORTED TOGETHER 
    1. Check for continuity between the Fuel Pump Feed circuits at the Fuel Pump Module harness connector.

      Is the continuity between any of the Fuel Pump Feed circuits?

      Yes 

      No 

      • Go To  20
  18. 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 

      • Go To  19

      No 

  19. REPLACE THE FUEL PUMP CONTROL MODULE AND RETEST FOR DTCS 
    1. Replace the Fuel Pump Control Module in accordance with the Service Information.
    2. Connect the FPCM harness connector.
    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 

      • Go To  20

      No 

      • Replacing the Fuel Pump Control Module repaired the fault.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  20. 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.

      Is the DTC active or pending?

      Yes 

      No 

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