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Home >> Acura >> 2003 >> RSX Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Supply System >> Fuel Pump Circuit Troubleshooting >> 2002-2004 models

2002-2004 models

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)
    G03651027Courtesy 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 5 And Body Ground
    G03651028Courtesy 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 1 And Body Ground
    G03651029Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 6.
    2. NO -  Check the No. 17 (15 A) fuel pump fuse. If the fuse is OK, repair open in the wire between the underdash fuse/relay box and PGM-FI main relay 2 (FUEL PUMP).
  6. Turn the ignition switch OFF.
  7. Disconnect ECM/PCM connector E (31P).
  8. Check for continuity between PGM-FI main relay 2 (FUEL PUMP) 5P connector terminal No. 3 and ECM/PCM connector terminal E1.
    Fig 4: Checking Continuity Between PGM-FI Main Relay 2 Connector Terminal 3 And ECM/PCM Connector Terminal E1
    G03651030Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Go to step 9.
    2. NO -  Repair open in the wire between PGM-FI main relay 2 (FUEL PUMP) and the ECM/PCM (E1).
  9. Reinstall PGM-FI main relay 2 (FUEL PUMP).
  10. Connect ECM/PCM connector terminal E7 to body ground with a jumper wire.
    Fig 5: Connecting ECM/PCM Connector Terminal E7 To Body Ground With A Jumper Wire
    G03651031Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Turn the ignition switch ON (II).
  12. Measure voltage between ECM/PCM connector terminal E1 and body ground.
    Fig 6: Measuring Voltage Between ECM/PCM Connector Terminal E1 And Body Ground
    G03651032Courtesy 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 E1 and body ground within 2 seconds.
    Fig 7: Measuring Voltage Between ECM/PCM Connector Terminal E1 And Body Ground
    G03651033Courtesy 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 HOW TO UPDATE THE ECM/PCM ), 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. Remove the rear seat cushion (see REAR SEAT REMOVAL/INSTALLATION ).
  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 8: Measuring Voltage Between Fuel Pump 5P Connector Terminal 5 And Body Ground
    G03651034Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step  24 .
    2. NO -  Go to step 20.
  20. Turn the ignition switch OFF.
  21. Remove PGM-FI main relay 2 (FUEL PUMP).
  22. Connect PGM-FI main relay 2 (FUEL PUMP) 5P connector terminals No. 1 and No. 2 with a jumper wire.
    Fig 9: Connecting PGM-FI Main Relay 2 Connector Terminals 1 And 2 With A Jumper Wire
    G03651035Courtesy of AMERICAN HONDA MOTOR CO., INC.
  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 10: Measuring Voltage Between Fuel Pump 5P Connector Terminal 5 And Body Ground
    G03651036Courtesy 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.
  24. Turn the ignition switch OFF.
  25. Check for continuity between fuel pump 5P connector terminal No. 4 and body ground.
    Fig 11: Checking Continuity Between Fuel Pump 5P Connector Terminal 4 And Body Ground
    G03651037Courtesy 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 G501.
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