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).
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