Honda Accord: 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 turned to ON (II). If the fuel pump does not make noise, check as follows: 1. Turn the ignition switch to LOCK (0).

2. Remove the driver's dashboard lower cover (see page 20-166).

3. Remove PGM-FI main relay 2 (FUEL PUMP) (A) from the driver's under-dash fuse/relay box.

4. Turn the ignition switch to ON (II).

5. Measure the voltage between PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 4 and body ground.

PGM-FI MAIN RELAY 2 (FUEL PUMP) 4P, CONNECTOR

Terminal side of female terminals

Is there battery voltage? YES-

Go to step 14.

NO

-Go to step 6.

6. Turn the ignition switch to LOCK (0).

7. Remove PGM-FI main relay 1 (A) and the ETCS control relay (B) from the under-hood fuse/relay box.

8. Jump the SCS line with the HDS.

9. Disconnect ECM/PCM connector A (49P).

10. Disconnect engine wire harness connector C101 at the left side of the engine compartment.

11. Disconnect the driver's under-dash fuse/relay box connector F (33P).

12. Connect PGM-FI main relay 1 4P connector terminal No. 2 to body ground with a jumper wire.

PGM-FI MAIN RELAY 1 4P CONNECTOR

Terminal side of female terminals

13. Check for continuity between driver's under-dash fuse/relay box connector F (33P) terminal No. 31 and body ground.

DRIVER'S UNDER-DASH hUsE/RELAY BOX CONNECTOR F (33P)

Wire side of female terminals

Is there continuity? YES

-Replace the driver's under-dash fuse/relay box; USA models (see page 22-86), Canafda models (see page 22-87).

NO-

- Repair open in the wire between the under-hood fuse/relay box and the driver's under-dash fuse/relay box.

- If the wire is OK, replace the under-hood fuse/relay box (see page 22-86).

14. Measure the voltage between PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 2 and body ground.

PGM-FI MAIN RELAY 2 (FUEL PUMP) 4P CONNECTOR

Terminal side of female terminals

Is there battery voltage? YES-

Go to step 15.

NO-

- Check the No. 9 FUEL PUMP (20 A) fuse in the driver's under-dash fuse/relay box.

- If the fuse is OK, replace the driver's under-dash fuse/relay box; USA models (see page 22-86), Canada models (see page 22-87).

15. Turn the ignition switch to LOCK (0).

16. Connect PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 3 to body ground with a jumper wire.

PGM-FI MAIN RELAY 2 (FUEL PUMP) 4P CONNECTOR

Terminal side of female terminals

17. Jump the SCS line with the HDS.

18. Disconnect ECM/PCM connector A (49P).

19. Check for continuity between body ground and ECM/PCM connector terminal A16.

ECM/PCM CONNECTOR A (49P)

Terminal side of female terminals

Is there continuity? YES

-Go to step 20.

NO

-Repair open in the wire between PGM-FI main relay 2 (FUEL PUMP) and the ECM/PCM (A16).

20. Reinstall PGM-FI main relay 2 (FUEL PUMP).

21. Connect ECM/PCM connector terminal A7 to body ground with a jumper wire.

ECM/PCM CONNECTOR A (49P)

Terminal side of female terminals

22. Turn the ignition switch to ON (II).

23. Measure the voltage between ECM/PCM connector terminal A16 and body ground.

ECM/PCM CONNECTOR A (49P)

Terminal side of female terminals

Is there battery voltage? YES

-Go to step 24.

NO

-Replace PGM-FI main relay 2 (FUEL PUMP).

24. Turn the ignition switch to LOCK (0).

25. Reconnect ECM/PCM connector A (49P).

28. Turn the ignition switch to ON (II), and measure the voltage between driver's under-dash fuse/relay box connector F (33P) terminal No. 22 and body ground within 2 seconds.

DRIVER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR F (33P)

Wire side of female terminals

Is there battery voltage? YES

-Update the ECM/PCM if it does not have the latest software (see page 11 -203), or substitute a known-good ECM/PCM (see page 11-7), then recheck.

If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete.

If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM (see page 11-204).

NO

-Go to step 27.

27. Turn the ignition switch to ON (II), and measure the voltage between driver's under-dash fuse/relay box connector F (33P) terminal No. 22 and body ground after 2 seconds.

DRIVERS UNDER-DASH FUSE/RELAY BOX CONNECTOR F (33P)

Wire side of female terminals

Is there battery voltage? YES

-Go to step 28.

NO-

Replace the driver's under-dash fuse/relay box; USA models (see page 22-86), Canada models (see page 22-87).

28. Turn the ignition switch to LOCK (0).

29. Remove the rear seat cushion (see page 20-241).

30. Remove the access panel from the floor (see page 11-320).

31. Turn the ignition switch to ON (II), and measure the voltage between fuel tank unit 4P connector terminal No. 2 and body ground within 2 seconds.

FUEL TANK UNIT 4P CONNECTOR

Wire side of female terminals

Is there battery voltage? YES

-Go to step 36.

NO

-Go to step 32.

32. Turn the Ignition switch to LOCK (0).

33. Remove PGM-FI main relay 2 (FUEL PUMP).

34. Connect PGM-FI main relay 2 (FUEL PUMP) 4P connector terminals No. 1 and No. 2 with a jumper wire.

PGM-FI MAIN RELAY 2 (FUEL PUMP) 4P CONNECTOR

Terminal side of female terminals

35. Turn the ignition switch to ON (II), and measure the voltage between fuel tank unit 4P connector terminal No. 2 and body ground.

FUEL TANK UNIT 4P CONNECTOR

Wire side of female terminals

Is there battery voltage? YES

-Replace PGM-FI main relay 2 (FUEL PUMP).

NO

- - Repair open in the wire between the driver's under-dash fuse/relay box (D10) and the fuel tank unit 4P conneetor.

- If the wire is OK, replace the driver's under-dash fuse/relay box (see page 22-86).

36. Turn the ignition switch to LOCK (0).

37. Check for continuity between fuel tank unit 4P connector terminal No. 4 and body ground.

FUEL TANK UNIT 4P CONNECTOR

Wire side of female terminals

Is there continuity? YES-

Replace the fuel pump (see page 11-324).

NO

-Repair open in the wire between the fuel tank unit 4P connector and G603; 4-door (see page 22-50), 2-door (see page 22-52).