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)

   Courtesy 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 And Body Ground

   Courtesy 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 And Body Ground

   Courtesy 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

   Courtesy 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. 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 Jumper Wire

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
12. Turn the ignition switch ON (II).
13. Measure voltage between ECM/PCM connector terminal E17 and body ground.
    Fig 6: Measuring Voltage Between ECM/PCM Connector Terminal E17 And Body Ground

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES-  Go to step 14.
    2. NO-  Replace PGM-FI main relay 2 (FUEL PUMP).
14. Turn the ignition switch OFF.
15. Remove the jumper wire, then reconnect ECM/PCM connector E (31P).
16. Open the SCS line with the HDS.
17. Turn the ignition switch ON (II), and measure voltage between ECM/PCM connector terminal E17 and body ground within 2 seconds.
    Fig 7: Measuring Voltage Between ECM/PCM Connector Terminal E17 And Body Ground

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage for 2 seconds? 

    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 18.
18. Turn the ignition switch OFF.
19. Remove the center console (see CENTER CONSOLE REMOVAL/INSTALLATION ), both track floor coverings (see FRONT FLOOR COVERING ), and both door sill trims (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
20. Fold back the rear floor covering until the access panel is accessible (see REAR FLOOR COVERING ). Remove the access panel from the floor.
21. 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 And Body Ground

    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage for 2 seconds? 

    1. YES-  Go to step  27 .
    2. NO-  Go to step 22.
22. Turn the ignition switch OFF.
23. Remove PGM-FI main relay 2 (FUEL PUMP).
24. 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 (Fuel Pump) 5P Connector Terminals With Jumper Wire

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
25. Turn the ignition switch ON (II).
26. Measure voltage between fuel pump 5P connector terminal No. 5 and body ground.
    Fig 10: Measuring Voltage Between Fuel Pump 5P Connector Terminal And Body Ground

    Courtesy 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.
27. Turn the ignition switch OFF.
28. Check for continuity between fuel pump 5P connector terminal No. 4 and body ground.
    Fig 11: Checking Continuity Between Fuel Pump 5P Connector Terminal And Body Ground

    Courtesy 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 G552.