Fuel Pump: Testing and Inspection
Fuel Pump Circuit TroubleshootingIf 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 ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0657 indicated?
YES - Go to the indicated DTC's troubleshooting first, then recheck.
NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Remove the dashboard lower cover, then remove the PGM-FI main relay 2 (FUEL PUMP) (A) from the multi-relay box.
7. Turn the ignition switch ON (II).
8. Measure voltage between PGM-FI main relay 2 (FUEL PUMP) 5P connector No.1 terminal and body ground.
Is there battery voltage?
YES - Go to step 9.
N0 -
- Check the No.1 FUEL PUMP (15 A) fuse in the under-dash fuse/relay box.
- Replace the under-dash fuse/relay box.
9. Turn the ignition switch OFF.
10. Remove the second row seat.
11. Cut the carpet at the dotted line (A). Be careful not to cut the wire harness under the carpet.
12. Remove the access panel from the floor.
13. Measure voltage between fuel pump 5P connector terminal No.5 and body ground within the first 2 seconds after the ignition switch is turned on.
Is there battery voltage?
YES - Go to step 19.
NO - Go to step 14.
14. Turn the ignition switch OFF.
15. Remove PGM-FI main relay 2 (FUEL PUMP).
16. Connect PGM-FI main relay 2 (FUEL PUMP) 5P connector terminals No.1 and No.2 with jumper wire.
17. Turn the ignition switch ON (II).
18. Measure voltage between fuel pump 5P connector terminal No.5 and body ground.
Is there battery voltage?
YES - Replace PGM-FI main relay 2 (FUEL PUMP).
NO - Repair open in the wire between PGM-FI main relay 2 (FUEL PUMP) and the fuel pump 5P connector.
19. Turn the ignition switch OFF.
20. Check for continuity between fuel pump 5P connector terminal No.4 and body ground.
Is there continuity?
YES - Replace the fuel pump.
NO - Repair open in the wire between the fuel pump 5P connector and G601.