P0627

DTC P0627: PGM-FI Main Relay 2 (Fuel Pump) Circuit Malfunction

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch ON (II).
4. Wait for 10 seconds.
5. Check for Temporary DTCs or DTCs with the HDS.

Is P0627 indicated?

YES - Go to step 8.

NO - Go to step 6.

6. Crank the engine for 5 seconds.
7. Check for Temporary DTCs or DTCs with the HDS.

Is P0627 indicated?

YES - Go to step 8.

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at PGM-FI main relay 2 (FUEL PUMP) and the PCM.

8. Turn the ignition switch OFF.
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector B (56P).
11. Remove PGM-FI main relay 2 (FUEL PUMP).




12. Check for continuity between PCM connector terminal B13 and PGM-FI main relay 2 (FUEL PUMP) 5P connector terminal No.5.

Is there continuity?

YES - Go to step 13.

NO - Repair open in the wire between the PCM and PGM-FI main relay 2 (FUEL PUMP), then go to step 19.




13. Check for continuity between PGM-FI main relay 2 (FUEL PUMP) 5P connector terminal No.3 and body ground.

Is there continuity?

YES - Go to step 14.

NO - Repair poor ground (G401) or open in the wire between the PCM and PGM-FI main relay 2 (FUEL PUMP), then go to step 19.




14. Check for continuity between PGM-FI main relay 2 (FUEL PUMP) 5P connector terminal No.5 and body ground.

Is there continuity?

YES - Repair short in the wire between the PCM (B13) and PGM-FI main relay 2 (FUEL PUMP), then go to step 19.

NO - Go to step 15.

15. Substitute a known-good PGM-FI main relay 2 (FUEL PUMP).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure.
18. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - Go to step 23.

NO - Replace the original relay, then go to step 19.

19. Turn the ignition switch ON (II).
20. Reset the PCM with the HDS.
21. Do the PCM idle learn procedure.
22. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0627 is indicated, check for poor connections or loose terminals at the PGM-FI main relay 2 (FUEL PUMP) and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Troubleshooting is complete.

23. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
24. Do the PCM idle learn procedure.
25. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0627 is indicated, check for poor connections or loose terminals at the PGM-FI main relay 2 (FUEL PUMP) and PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM.