Honda Civic. Manual — part 687

6. Turn the ignition switch OFF.
7. Disconnect the under-hood fuse/relay box connector E (10P).
8. Disconnect C101 connector at left side of engine compartment; A/T model (see

CONNECTOR TO HARNESS INDEX ), M/T model (see CONNECTOR
TO HARNESS INDEX ).

9. Disconnect the under-dash fuse/relay box connector G (21P).

10. Connect under-dash fuse/relay box connector G (21P) terminal No. 4 to body

ground with a jumper wire.

Fig. 12: Connecting Fuse/Relay Box Connector G (21P) Terminal No. 4 To
Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

11. Check for continuity between under-hood fuse/relay box connector E (10P)

terminal No. 5 and body ground.

Fig. 13: Checking Continuity Between Fuse/Relay Box Connector E (10P)
Terminal No. 5 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System (R18A1) - Civic (Except Hybrid)

Is there continuity?

YES -

Replace PGM-FI main relay 1.

If needed, replace the under-hood fuse/relay box (see REMOVAL AND
INSTALLATION ).

NO - Repair open in the wire between the under-hood fuse/relay box and the
under-dash fuse/relay box.

12. Measure voltage between PGM-FI main relay 2 (FUEL PUMP) 4P connector

terminal No. 1 and body ground.

Fig. 14: Measuring Voltage Between PGM-FI Main Relay 2 (FUEL
PUMP) 4P Connector Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 13.

NO -

Check the No. 2 FUEL PUMP (15 A) fuse in the under-dash fuse/relay
box.

If needed, replace the under-dash fuse/relay box (see REMOVAL AND
INSTALLATION ).

13. Turn the ignition switch OFF.

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System (R18A1) - Civic (Except Hybrid)

14. Connect PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 3 to

body ground with a jumper wire.

Fig. 15: Connecting PGM-FI Main Relay 2 (FUEL PUMP) 4P Connector
Terminal No. 3 To Body Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

15. Jump the SCS line with the HDS.
16. Disconnect ECM/PCM connector A (44P).
17. Check for continuity between body ground and ECM/PCM connector terminal

A15.

Fig. 16: Checking Continuity Between Body Ground And ECM/PCM
Connector Terminal A15
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 18.

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System (R18A1) - Civic (Except Hybrid)

NO - Repair open in the wire between PGM-FI main relay 2 (FUEL PUMP)
and the ECM/PCM (A15).

18. Remove the under-dash fuse/relay box (see REMOVAL AND

INSTALLATION ), then reinstall PGM-FI main relay 2 (FUEL PUMP).

19. Reinstall the under-dash fuse/relay box (see REMOVAL AND

INSTALLATION ).

20. Connect ECM/PCM connector terminal A6 to body ground with a jumper wire.

Fig. 17: Connecting ECM/PCM Connector Terminal A6 To Body Ground
With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

21. Turn the ignition switch ON (II).
22. Measure voltage between ECM/PCM connector terminal A15 and body

ground.

Fig. 18: Measuring Voltage Between ECM/PCM Connector Terminal A15

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System (R18A1) - Civic (Except Hybrid)