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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 left kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ), then remove PGM-FI main relay 2 (FUEL PUMP) (A) from the underdash fuse/relay box.
    Fig 1: Removing Left Kick Panel
    G03688810Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Turn the ignition switch ON (II).
  4. Measure voltage between PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 3 and body ground.
    Fig 2: Measuring Voltage Between PGM-FI Main Relay 2 (Fuel Pump) 4P Connector Terminal No. 3 And Body Ground
    G03688811Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 5.
    2. NO  -
      • Replace PGM-FI main relay 1 (Fl MAIN).
      • If needed, replace the underdash fuse/relay box.
  5. Measure voltage between PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 1 and body ground.
    Fig 3: Measuring Voltage Between PGM-FI Main Relay 2 (Fuel Pump) 4P Connector Terminal No. 1 And Body Ground
    G03688812Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 6.
    2. NO  -
      • Check the No. 19 FUEL PUMP (15 A) fuse in the underdash fuse/relay box.
      • If needed, replace the underdash fuse/relay box.
  6. Turn the ignition switch OFF.
  7. Connect PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 4 to body ground with a jumper wire.
    Fig 4: Connecting PGM-FI Main Relay 2 (Fuel Pump) 4P Connector Terminal No. 4 To Body Ground With A Jumper Wire
    G03688813Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Jump the SCS line with the HDS.
  9. Disconnect PCM connector A (44P).
  10. Check for continuity between body ground and PCM connector terminal All.
    Fig 5: Checking Continuity Between Body Ground And PCM Connector Terminal
    G03688814Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 11.
    2. NO  - Repair open in the wire between PGM-FI main relay 2 (FUEL PUMP) and the PCM (A11 ).
  11. Reinstall PGM-FI main relay 2 (FUEL PUMP).
  12. Connect PCM connector terminal A6 to body ground with a jumper wire.
    Fig 6: Connecting PCM Connector Terminal A6 To Body Ground With A Jumper Wire
    G03688815Courtesy of AMERICAN HONDA MOTOR CO., INC.
  13. Turn the ignition switch ON (II).
  14. Measure voltage between PCM connector terminal A11 and body ground.
    Fig 7: Measuring Voltage Between PCM Connector Terminal A11 And Body Ground
    G03688816Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 15.
    2. NO  - Replace PGM-FI main relay 2 (FUEL PUMP).
  15. Turn the ignition switch OFF.
  16. Reconnect PCM connector A (44P).
  17. Exit the SCS mode with the HDS.
  18. Turn the ignition switch OFF.
  19. Turn the ignition switch ON (II), and measure voltage between underdash fuse/relay box 39P connector terminal No. 3 and body ground within 2 seconds.
    Fig 8: Measuring Voltage Between underdash Fuse/Relay Box 39P Connector Terminal No. 3 And Body Ground Within 2 Seconds
    G03688817Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM (see PCM REPLACEMENT ).
    2. NO  - Go to step 20.
  20. Turn the ignition switch OFF.
  21. Remove the rear-seat back (see REAR SEAT-BACK REMOVAL/INSTALLATION ).
  22. Remove the access panel from the floor.
  23. Turn the ignition switch ON (II), and measure voltage between fuel pump 5P connector terminal No. 5 and body ground within 2 seconds.
    Fig 9: Measuring Voltage Between Fuel Pump 5P Connector Terminal No. 5 And Body Ground
    G03688818Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step  28.
    2. NO  - Go to step 24.
  24. Turn the ignition switch OFF.
  25. Remove PGM-FI main relay 2 (FUEL PUMP),
  26. Connect PGM-FI main relay 2 (FUEL PUMP) 4P connector terminals No. 1 and No. 2 with a jumper wire.
    Fig 10: Connecting PGM-FI Main Relay 2 (Fuel Pump) 4P Connector Terminals No. 1 And No. 2 With A Jumper Wire
    G03688819Courtesy of AMERICAN HONDA MOTOR CO., INC.
  27. Turn the ignition switch ON (II), and measure voltage between fuel pump 5P connector terminal No. 5 and body ground within 2 seconds.
    Fig 11: Measuring Voltage Between Fuel Pump 5P Connector Terminal No. 5 And Body Ground
    G03688820Courtesy 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.
  28. Turn the ignition switch OFF.
  29. Check for continuity between fuel pump 5P connector terminal No. 4 and body ground.
    Fig 12: Checking Continuity Between Fuel Pump 5P Connector Terminal No. 4 And Body Ground
    G03688821Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Replace the fuel pump.
    2. NO  - Repair open in the wire between the fuel pump 5P connector and G502.
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