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Fuel Pump Circuit Troubleshooting

If you suspect a problem with the fuel pump, check that the fuel pump actually runs; when it is on, you will hear some noise if you listen to the fuel fill port with the fuel fill cap removed. The fuel pump should run for 2 seconds when the ignition switch is first turned on. If the fuel pump does not make noise, check as follows:

  1. Turn the ignition switch OFF.
  2. Remove the glove box (see GLOVE BOX REMOVAL/INSTALLATION ), then remove PGM-FI main relay 2 (FUEL PUMP) (A).
    Fig 1: Removing PGM-FI Main Relay 2 (Fuel Pump)
    G03674223Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Turn the ignition switch ON (II).
  4. Measure voltage between PGM-FI main relay 2 (FUEL PUMP) 5P connector terminal No. 5 and body ground.
    Fig 2: Measuring Voltage Between PGM-FI Main Relay 2 (FUEL PUMP) 5P Connector Terminal No. 5 And Body Ground
    G03674224Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 5.
    2. NO  - Repair open in the wire between PGM-FI main relay 1 (FI MAIN) and PGM-FI main relay 2 (FUEL PUMP).
  5. Measure voltage between PGM-FI main relay 2 (FUEL PUMP) 5P connector terminal No. 1 and body ground.
    Fig 3: Measuring Voltage Between PGM-FI Main Relay 2 (FUEL PUMP) 5P Connector Terminal No. 1 And Body Ground
    G03674225Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 6.
    2. NO  - Repair open in the wire between the under-dash fuse/relay box (No. 17 FUEL PUMP (15 A) fuse) and PGM-FI main relay 2 (FUEL PUMP).
  6. Turn the ignition switch OFF.
  7. Jump the SCS line with the HDS.
  8. Disconnect ECM/PCM connector E (31P).
  9. Check for continuity between PGM-FI main relay 2 (FUEL PUMP) 5P connector terminal No. 3 and ECM/PCM connector terminal E17.
    Fig 4: Checking Continuity Between PGM-FI Main Relay 2 (FUEL PUMP) 5P Connector Terminal No. 3 And ECM/PCM Connector Terminal E17
    G03674226Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 10.
    2. NO  - Repair open in the wire between PGM-FI main relay 2 (FUEL PUMP) and the ECM/PCM (E17).
  10. Reinstall PGM-FI main relay 2 (FUEL PUMP).
  11. Turn the ignition switch ON (II).
  12. Measure voltage between ECM/PCM connector terminal E17 and body ground.
    Fig 5: Measuring Voltage Between ECM/PCM Connector Terminal E17 And Body Ground
    G03674227Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 13.
    2. NO  - Replace PGM-FI main relay 2 (FUEL PUMP).
  13. Turn the ignition switch OFF.
  14. Reconnect ECM/PCM connector E (31P).
  15. Turn the ignition switch ON (II), and measure voltage between ECM/PCM connector terminal E17 and body ground within 2 seconds.
    Fig 6: Measuring Voltage Between ECM/PCM Connector Terminal E17 And Body Ground
    G03674228Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).
    2. NO  - Go to step 16.
  16. Turn the ignition switch OFF.
  17. Fold the rear seats forward, and pull back the carpet to expose the access panel.
  18. Remove the access panel from the floor.
  19. Turn the ignition switch ON (II), and measure voltage between fuel pump 5P connector terminal No. 5 and body ground within 2 seconds.
    Fig 7: Measuring Voltage Between Fuel Pump 5P Connector Terminal No. 5 And Body Ground
    G03674229Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step  25 .
    2. NO  - Go to step 20.
  20. Turn the ignition switch OFF.
  21. Remove PGM-FI main relay 2 (FUEL PUMP).
  22. Connect the PGM-FI main relay 2 (FUEL PUMP) 5P connector terminals No. 1 and No. 2 with a jumper wire.
    Fig 8: Connecting PGM-FI Main Relay 2 (Fuel Pump) 5P Connector Terminals No. 1 And No. 2 With Jumper Wire
    G03674230Courtesy of AMERICAN HONDA MOTOR CO., INC.
  23. Turn the ignition switch ON (II).
  24. Measure voltage between fuel pump 5P connector terminal No. 5 and body ground.
    Fig 9: Measuring Voltage Between Fuel Pump 5P Connector Terminal No. 5 And Body Ground
    G03674231Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Replace PGM-FI main relay 2 (FUEL PUMP).
    2. NO  - Repair open in the wire between PGM-FI main relay 2 (FUEL PUMP) and the fuel pump 5P connector.
  25. Turn the ignition switch OFF.
  26. Check for continuity between fuel pump 5P connector terminal No. 4 and body ground.
    Fig 10: Checking Continuity Between Fuel Pump 5P Connector Terminal No. 4 And Body Ground
    G03674232Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Replace the fuel pump (see FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT  ).
    2. NO  - Repair open in the wire between the fuel pump 5P connector and G551.
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