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Home >> Acura >> 2012 >> ZDX >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Supply System >> DTC Troubleshooting >> DTC P0627: Fuel Pump Control Module System Malfunction
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DTC P0627: Fuel Pump Control Module System Malfunction

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  2. Clear the DTC with the HDS.
  3. Turn the ignition switch to START (III), or press the engine start/stop button to select the START mode.
    NOTE: This vehicle has an auto control mode starting system. It keeps the starter motor running for 15 seconds (or until the engine starts) after the ignition switch or the engine start/stop button is released.
  4. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0627 indicated? 

    YES  -Go to step 5.

    NO  -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the fuel pump control module, PGM-FI main relay 2, the fuel tank unit, and the PCM.

  5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  6. Check the No. 9 FUEL PUMP (20 A) fuse in the driver's under-dash fuse/relay box.

    Is the fuse OK? 

    YES  -Go to step 7.

    NO  -Repair a short in the wire between PGM-FI main relay 2 and the No. 9 FUEL PUMP (20 A) fuse. Also replace the fuse, then go to step  76.

  7. Disconnect the fuel pump control module 10P connector (see FUEL PUMP CONTROL MODULE REPLACEMENT  ).
  8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and measure the voltage between fuel pump control module 10P connector terminals No. 3 and No. 8 within 2 seconds.
    Fig 1: Measuring Voltage Between Fuel Pump Control Module 10P Connector Terminals No. 3 And 8
    G08072912Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  30.

    NO  -Go to step 9.

  9. Check for continuity between fuel pump control module 10P connector terminal No. 8 and body ground.
    Fig 2: Checking Continuity Between Fuel Pump Control Module 10P Connector Terminal No. 8 And Body Ground
    G08072913Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 10.

    NO  -Repair an open in the wire between the fuel pump control module (GND line) and G604 (see CONNECTOR TO HARNESS INDEX ), then go to step  76.

  10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  11. Remove the driver's dashboard undercover (see DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ), then remove PGM-FI main relay 2 (A) from the driver's under-dash fuse/relay box.
    Fig 3: Identifying PGM-FI Main Relay 2
    G08072914Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Test PGM-FI main relay 2 (see POWER RELAY TEST ).

    Is PGM-FI main relay 2 OK? 

    YES  -Go to step 13.

    NO  -Replace PGM-FI main relay 2, then go to step  76.

  13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  14. Measure the voltage between PGM-FI main relay 2 4P connector terminal No. 4 and body ground.
    Fig 4: Measuring Voltage Between PGM-FI Main Relay 2 4P Connector Terminal No. 4 And Body Ground
    G08072915Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  21.

    NO  -Go to step 15.

  15. Remove PGM-FI main relay 1 (A) and the ETCS control relay (B) from the under-hood fuse/relay box.
    Fig 5: Identifying PGM-FI Main Relay 1 And ETCS Control Relay Of Under-Hood Fuse/Relay Box
    G08072916Courtesy of AMERICAN HONDA MOTOR CO., INC.
  16. Jump the SCS line with the HDS.
  17. Disconnect the engine wire harness 13P connector (C101).
  18. Disconnect Driver's under-dash fuse/relay box connector F (33P).
  19. Connect PGM-FI main relay 1 4P connector terminal No. 2 to body ground with a jumper wire.
    Fig 6: Connecting PGM-FI Main Relay 1 4P Connector Terminal No. 2 To Body Ground With Jumper Wire
    G08072917Courtesy of AMERICAN HONDA MOTOR CO., INC.
  20. Check for continuity between Driver's under-dash fuse/relay box connector F (33P) terminal No. 31 and body ground.
    Fig 7: Checking Continuity Between Driver's Under-Dash Fuse/Relay Box Connector F (33P) Terminal No. 31 And Body Ground
    G08072918Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace the Driver's under-dash fuse/relay box (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL AND INSTALLATION ), then go to step  76.

    NO  -

    • Repair an open in the wire between the under-hood fuse/relay box and the Driver's under-dash fuse/relay box, then go to step  76.
    • If the wire is OK, replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ), then go to step  76.
  21. Measure the voltage between PGM-FI main relay 2 4P connector terminal No. 2 and body ground.
    Fig 8: Measuring Voltage Between PGM-FI Main Relay 2 4P Connector Terminal No. 2 And Body Ground
    G08072919Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 22.

    NO  -Replace the Driver's under-dash fuse/relay box (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL AND INSTALLATION ), then go to step  76.

  22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  23. Connect PGM-FI main relay 2 4P connector terminals No. 1 and No. 2 with a jumper wire.
    Fig 9: Connecting PGM-FI Main Relay 2 4P Connector Terminals No. 1 And 2 With Jumper Wire
    G08072920Courtesy of AMERICAN HONDA MOTOR CO., INC.
  24. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and measure the voltage between fuel pump control module 10P connector terminal No. 3 and body ground.
    Fig 10: Measuring Voltage Between Fuel Pump Control Module 10P Connector Terminal No. 3 And Body Ground
    G08072921Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 25.

    NO  -

  25. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  26. Jump the SCS line with the HDS.
  27. Disconnect PCM connector A (49P).
  28. Connect PGM-FI main relay 2 4P connector terminal No. 3 to body ground with a jumper wire.
    Fig 11: Connecting PGM-FI Main Relay 2 4P Connector Terminal No. 3 To Body Ground With Jumper Wire
    G08072922Courtesy of AMERICAN HONDA MOTOR CO., INC.
  29. Check for continuity between PCM connector terminal A11 and body ground.
    Fig 12: Checking Continuity Between PCM Connector Terminal A11 And Body Ground
    G08072923Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  81.

    NO  -Repair an open in the wire between the PCM (A11) and PGM-FI main relay 2, then go to step  76.

  30. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  31. Reconnect the fuel pump control module 10P connector (see FUEL PUMP CONTROL MODULE REPLACEMENT  ).
  32. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  33. Clear the DTC with the HDS.
  34. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  35. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and check for sound from the fuel pump within 2 seconds.

    Does the fuel pump operate? 

    YES  -Go to step 36.

    NO  -Go to step  56.

  36. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  37. Disconnect the fuel pump control module 10P connector.
  38. Check for continuity between fuel pump control module 10P connector terminal No. 4 and body ground.
    Fig 13: Checking Continuity Between Fuel Pump Control Module 10P Connector Terminal No. 4 And Body Ground
    G08072924Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 39.

    NO  -Go to step  42.

  39. Jump the SCS line with the HDS.
  40. Disconnect PCM connector A (49P).
  41. Check for continuity between PCM connector terminal A42 and body ground.
    Fig 14: Checking Continuity Between PCM Connector Terminal A42 And Body Ground
    G08072925Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the PCM (A42) and the fuel pump control module, then go to step  76.

    NO  -Go to step  81.

  42. Jump the SCS line with the HDS.
  43. Disconnect PCM connector A (49P).
  44. Connect fuel pump control module 10P connector terminal No. 4 to body ground with a jumper wire.
    Fig 15: Connecting Fuel Pump Control Module 10P Connector Terminal No. 4 To Body Ground With Jumper Wire
    G08072926Courtesy of AMERICAN HONDA MOTOR CO., INC.
  45. Check for continuity between PCM connector terminal A42 and body ground.
    Fig 16: Checking Continuity Between PCM Connector Terminal A42 And Body Ground
    G08072927Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 46.

    NO  -Repair an open in the wire between the PCM (A42) and the fuel pump control module, then go to step  76.

  46. Remove the jumper wire from the fuel pump control module 10P connector.
  47. Reconnect the fuel pump control module 10P connector and PCM connector A (49P).
  48. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  49. Measure the voltage between fuel pump control module 10P connector terminal No. 4 and body ground.
    Fig 17: Measuring Voltage Between Fuel Pump Control Module 10P Connector Terminal No. 4 And Body Ground
    G08072928Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 8 V or more? 

    YES  -Go to step 50.

    NO  -Replace the fuel pump control module (see FUEL PUMP CONTROL MODULE REPLACEMENT  ), then go to step  75.

  50. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  51. Remove the rear seat cushion (see REAR SEAT REMOVAL/INSTALLATION ).
  52. Remove the access panel from the floor (see FUEL TANK UNIT REMOVAL AND INSTALLATION  ).
  53. Disconnect the fuel tank unit 4P connector.
  54. Disconnect the fuel pump control module 10P connector.
  55. Check for continuity between fuel pump control module 10P connector terminal No. 7 and body ground.
    Fig 18: Checking Continuity Between Fuel Pump Control Module 10P Connector Terminal No. 7 And Body Ground
    G08072929Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the fuel pump control module (FP-line) and the fuel tank unit, then go to step  76.

    NO  -Substitute a known-good fuel pump control module (see FUEL PUMP CONTROL MODULE REPLACEMENT  ), then go to step  75 and recheck. If DTC P0627 is not indicated, replace the original fuel pump control module (see FUEL PUMP CONTROL MODULE REPLACEMENT  ), then go to step  75. If DTC P0627 is indicated, go to step  81.

  56. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  57. Disconnect the fuel pump control module 10P connector (see FUEL PUMP CONTROL MODULE REPLACEMENT  ).
  58. Check for continuity between fuel pump control module 10P connector terminal No. 5 and body ground.
    Fig 19: Checking Continuity Between Fuel Pump Control Module 10P Connector Terminal No. 5 And Body Ground
    G08072930Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 59.

    NO  -Go to step  62.

  59. Jump the SCS line with the HDS.
  60. Disconnect PCM connector A (49P).
  61. Check for continuity between PCM connector terminal A43 and body ground.
    Fig 20: Checking Continuity Between PCM Connector Terminal A43 And Body Ground
    G08072931Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the PCM (A43) and the fuel pump control module, then go to step  76.

    NO  -Go to step  81.

  62. Reconnect the fuel pump control module 10P connector.
  63. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and measure the voltage between fuel pump control module 10P connector terminal No. 5 and body ground within 2 seconds.
    Fig 21: Measuring Voltage Between Fuel Pump Control Module 10P Connector Terminal No. 5 And Body Ground
    G08072932Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 64.

    NO  -Replace the fuel pump control module (see FUEL PUMP CONTROL MODULE REPLACEMENT  ), then go to step  76.

  64. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  65. Remove the rear seat cushion (see REAR SEAT REMOVAL/INSTALLATION ).
  66. Remove the access panel from the floor (see FUEL TANK UNIT REMOVAL AND INSTALLATION  ).
  67. Disconnect the fuel tank unit 4P connector.
  68. Disconnect the fuel pump control module 10P connector (see FUEL PUMP CONTROL MODULE REPLACEMENT  ).
  69. Connect fuel tank unit 4P connector terminal No. 2 to body ground with a jumper wire.
    Fig 22: Connecting Fuel Tank Unit 4P Connector Terminal No. 2 To Body Ground With Jumper Wire
    G08072933Courtesy of AMERICAN HONDA MOTOR CO., INC.
  70. Check for continuity between fuel pump control module 10P connector terminal No. 6 and body ground.
    Fig 23: Checking Continuity Between Fuel Pump Control Module 10P Connector Terminal No. 6 And Body Ground
    G08072934Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 71.

    NO  -Repair an open in the wire between the fuel pump control module (FP+ line) and the fuel tank unit, then go to step  76.

  71. Connect fuel tank unit 4P connector terminal No. 4 to body ground with a jumper wire.
    Fig 24: Connecting Fuel Tank Unit 4P Connector Terminal No. 4 To Body Ground With Jumper Wire
    G08072935Courtesy of AMERICAN HONDA MOTOR CO., INC.
  72. Check for continuity between fuel pump control module TOP connector terminal No. 7 and body ground.
    Fig 25: Checking Continuity Between Fuel Pump Control Module Top Connector Terminal No. 7 And Body Ground
    G08072936Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 73

    NO  -Repair an open in the wire between the fuel pump control module (FP-line) and the fuel tank unit, then go to step  76.

  73. Remove the jumper wire from fuel tank unit 4P connector terminal No. 4, and reconnect the fuel pump control module 10P connector.
  74. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and measure the voltage between fuel tank unit 4P connector terminal No. 2 and body ground within 2 seconds.
    Fig 26: Measuring Voltage Between Fuel Tank Unit 4P Connector Terminal No. 2 And Body Ground
    G08072937Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Replace the fuel pump (see FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT  ), then go to step 75.

    NO  -Substitute a known-good fuel pump control module (see FUEL PUMP CONTROL MODULE REPLACEMENT  ), then go to step 75 and recheck. If DTC P0627 is not indicated, replace the original fuel pump control module (see FUEL PUMP CONTROL MODULE REPLACEMENT  ), then go to step 75. If DTC P0627 is indicated, go to step  81.

  75. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  76. Reconnect all connectors.
  77. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  78. Reset the PCM with the HDS.
  79. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  80. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0627 indicated? 

    YES  -Check for poor connections or loose terminals at the fuel pump control module, PGM-FI main relay 2, the fuel tank unit, and the PCM, then go to step  1.

    NO  -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTCS TROUBLESHOOTING .

  81. Reconnect all connectors.
  82. Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  83. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0627 indicated? 

    YES  -Check for poor connections or loose terminals at the fuel pump control module, PGM-FI main relay 2, the fuel tank unit, and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step  1.

    NO  -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTCS TROUBLESHOOTING .

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