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DTC P0627: Fuel Pump Control 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).
  2. Clear the DTC with the HDS.
  3. Turn the ignition switch to the START (III).
    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 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).
  6. Check the No. 19 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. 19 FUEL PUMP (20 A) fuse. Also replace the fuse, then go to step 66 66.

  7. Disconnect the fuel pump control module 10P connector (see FUEL PUMP CONTROL MODULE REPLACEMENT ).
  8. Turn the ignition switch to ON (II), and measure the voltage between fuel pump control module 10P connector terminals No. 3 and No, 8 within 2 seconds.
    Fig 1: Removing PGM-FI Main Relay 2 From Driver's Under-Dash Fuse/Relay Box
    G07353905Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 24 24.

    NO  -Go to step 9.

  9. Turn the ignition switch to LOCK (0).
  10. Check for continuity between fuel pump control module 10P connector terminal No. 8 and body ground.
    Fig 2: Measuring Voltage Between PGM-FI Main Relay 2 4P Connector Terminal No. 3 And Body Ground
    G07353906Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 11.

    NO  -Repair an open in the wire between the fuel pump control module (GND line) and G654, then go to step 65 65.

  11. Remove the left kick panel (see step 3 on TRIM REMOVAL/INSTALLATION - DOOR AREAS ), then remove PGM-FI main relay 2 (A) from the driver's under-dash fuse/relay box.
    Fig 3: Measuring Voltage Between PGM-FI Main Relay 2 4P Connector Terminal No. 1 And Body Ground
    G07353907Courtesy 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 65 65.

  13. Turn the ignition switch to ON (II).
  14. Measure the voltage between PGM-FI main relay 2 4P connector terminal No. 3 and body ground.
    Fig 4: Connecting PGM-FI Main Relay 2 4P Connector Terminals No. 1 And No. 2 With Jumper Wire
    G07353908Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 15.

    NO  -

  15. Measure the voltage between PGM-FI main relay 2 4P connector terminal No. 1 and body ground.
    Fig 5: Measuring Voltage Between Fuel Pump Control Module 10P Connector Terminal No. 3 And Body Ground
    G07353909Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 16.

    NO  -Replace the driver's under-dash fuse/relay box (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION ), then go to step 65 65.

  16. Turn the ignition switch to LOCK (0).
  17. Connect PGM-FI main relay 2 4P connector terminals No. 1 and No. 2 with a jumper wire.
    Fig 6: Connecting PGM-FI Main Relay 2 4P Connector Terminal No. 4 To Body Ground With Jumper Wire
    G07353910Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Turn the ignition switch to ON (II), and measure the voltage between fuel pump control module 10P connector terminal No. 3 and body ground within 2 seconds.
    Fig 7: Checking Continuity Between PCM Connector Terminal A11 And Body Ground
    G07353911Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 19.

    NO  -

  19. Turn the ignition switch to LOCK (0).
  20. Jump the SCS line with the HDS.
  21. Disconnect PCM connector A (49P).
  22. Connect PGM-FI main relay 2 4P connector terminal No. 4 to body ground with a jumper wire.
    Fig 8: Checking Continuity Between Fuel Pump Control Module 10P Connector Terminal No. 4 And Body Ground
    G07353912Courtesy of AMERICAN HONDA MOTOR CO., INC.
  23. Check for continuity between PCM connector terminal A11 and body ground.
    Fig 9: Checking Continuity Between PCM Connector Terminal A42 And Body Ground
    G07353913Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 70 70.

    NO  -Repair an open in the wire between the PCM (A11) and PGM-FI main relay 2, then go to step 65.

  24. Turn the ignition switch to LOCK (0).
  25. Reconnect the fuel pump control module 10P connector (see FUEL PUMP CONTROL MODULE REPLACEMENT ).
  26. Turn the ignition switch to ON (II).
  27. Clear the DTC with the HDS.
  28. Turn the ignition switch to LOCK (0).
  29. Turn the ignition switch to ON (II), and check for sound from the fuel pump within 2 seconds.

    Does the fuel pump operate? 

    YES  -Go to step 30.

    NO  -Go to step 48 48.

  30. Turn the ignition switch to LOCK (0).
  31. Disconnect the fuel pump control module 10P connector.
  32. Check for continuity between fuel pump control module 10P connector terminal No. 4 and body ground.
    Fig 10: Connecting Fuel Pump Control Module 10P Connector Terminal No. 4 To Body Ground With Jumper Wire
    G07353914Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 33.

    NO  -Go to step 36 36.

  33. Jump the SCS line with the HDS.
  34. Disconnect PCM connector A (49P).
  35. Check for continuity between PCM connector terminal A42 and body ground.
    Fig 11: Checking Continuity Between PCM Connector Terminal A42 And Body Ground
    G07353915Courtesy 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 65 65.

    NO  -Go to step 70 70.

  36. Jump the SCS line with the HDS.
  37. Disconnect PCM connector A (49P).
  38. Connect fuel pump control module 10P connector terminal No. 4 to body ground with a jumper wire.
    Fig 12: Measuring Voltage Between Fuel Pump Control Module 10P Connector Terminal No. 4 And Body Ground
    G07353916Courtesy of AMERICAN HONDA MOTOR CO., INC.
  39. Check for continuity between PCM connector terminal A42 and body ground.
    Fig 13: Checking Continuity Between Fuel Pump Control Module 10P Connector Terminal No. 7 And Body Ground
    G07353917Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 40.

    NO  -Repair an open in the wire between the PCM (A42) and the fuel pump control module, then go to step 65 65.

  40. Remove the jumper wire from the fuel pump control module 10P connector.
  41. Reconnect the fuel pump control module 10P connector and PCM connector A (49P).
  42. Turn the ignition switch to ON (II).
  43. Measure the voltage between fuel pump control module 10P connector terminal No. 4 and body ground.
    Fig 14: Checking Continuity Between Fuel Pump Control Module 10P Connector Terminal No. 5 And Body Ground
    G07353918Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 8V or more? 

    YES  -Go to step 44.

    NO  -Replace the fuel pump control module (see FUEL PUMP CONTROL MODULE REPLACEMENT ), then go to step 65 65.

  44. Turn the ignition switch to LOCK (0).
  45. Disconnect the fuel tank unit 5P connector (see FUEL TANK UNIT REMOVAL AND INSTALLATION ).
  46. Disconnect the fuel pump control module 10P connector (see FUEL PUMP CONTROL MODULE REPLACEMENT ).
  47. Check for continuity between fuel pump control module 10P connector terminal No. 7 and body ground.
    Fig 15: Measuring Voltage Between Fuel Pump Control Module 10P Connector Terminal No. 5 And Body Ground
    G07353919Courtesy 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 65 65.

    NO  -Substitute a known-good fuel pump control module (see FUEL PUMP CONTROL MODULE REPLACEMENT ), then go to step 65  65and recheck. If DTC P0627 is not indicated, replace the original fuel pump control module (see FUEL PUMP CONTROL MODULE REPLACEMENT ), then go to step 65 65. If DTC P0627 is indicated, go to step 70 70.

  48. Turn the ignition switch to LOCK (0).
  49. Disconnect the fuel pump control module 10P connector (see FUEL PUMP CONTROL MODULE REPLACEMENT ).
  50. Check for continuity between fuel pump control module 10P connector terminal No. 5 and body ground.
    Fig 16: Connecting Fuel Tank Unit 5P Connector Terminal No. 5 To Body Ground With Jumper Wire
    G07353920Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 51.

    NO  -Go to step 54 54.

  51. Jump the SCS line with the HDS.
  52. Disconnect PCM connector A (49P).
  53. Check for continuity between PCM connector terminal A43 and body ground.
    Fig 17: Checking Continuity Between Fuel Pump Control Module 10P Connector Terminal No. 6 And Body Ground
    G07353921Courtesy 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 65 65.

    NO  -Go to step 70 70.

  54. Reconnect the fuel pump control module 10P connector.
  55. Turn the ignition switch to ON (II), and measure the voltage between fuel pump control module 10P connector terminal No. 5 and body ground within 2 seconds.
    Fig 18: Checking Continuity Between Fuel Pump Control Module 10P Connector Terminal No. 7 And Body Ground
    G07353922Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 56.

    NO  -Replace the fuel pump control module (see FUEL PUMP CONTROL MODULE REPLACEMENT ), then go to step 65 65.

  56. Turn the ignition switch to LOCK (0).
  57. Disconnect the fuel tank unit 5P connector (see FUEL TANK UNIT REMOVAL AND INSTALLATION ).
  58. Disconnect the fuel pump control module 10P connector (see FUEL PUMP CONTROL MODULE REPLACEMENT ).
  59. Connect fuel tank unit 5P connector terminal No. 5 to body ground with a jumper wire.
    Fig 19: Measuring Voltage Between Fuel Tank Unit 5P Connector Terminal No. 5 And Body Ground
    G07353923Courtesy of AMERICAN HONDA MOTOR CO., INC.
  60. Check for continuity between fuel pump control module 10P connector terminal No. 6 and body ground.
    Fig 20: Identifying Data Link Connector
    G07353924Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 61.

    NO  -Repair an open in the wire between the fuel pump control module (FP+ line) and the fuel tank unit, then go to step 65 65.

  61. Connect fuel tank unit 5P connector terminal No. 4 to body ground with a jumper wire.
    62. Fig 21: Removing Quick-Connect Fitting Cover
    G07353925Courtesy of AMERICAN HONDA MOTOR CO., INC.
  62. Check for continuity between fuel pump control module 10P connector terminal No. 7 and body ground.
    Fig 22: Placing Shop Towel Over Quick-Connect Fitting
    G07353926Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 63.

    NO  -Repair an open in the wire between the fuel pump control module (FP- line) and the fuel tank unit, then go to step 65 65.

  63. Reconnect the fuel pump control module 10P connector.
  64. Turn the ignition switch to ON (II), and measure the voltage between fuel tank unit 5P connector terminal No. 5 and body ground within 2 seconds.
    Fig 23: Disconnecting Quick-Connect Fitting
    G07353927Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Replace the fuel pump (see FUEL PUMP CONTROL MODULE REPLACEMENT ), then go to step 65 65.

    NO  -Substitute a known-good fuel pump control module (see FUEL PUMP CONTROL MODULE REPLACEMENT ), then go to step 65 65 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 65. If DTC P0627 is indicated, go to step 70 70.

  65. Reconnect all connectors.
  66. Turn the ignition switch to ON (II).
  67. Reset the PCM with the HDS.
  68. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  69. 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 1.

    NO  -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

  70. Reconnect all connectors.
  71. Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  72. 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 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 DTC's troubleshooting.

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