Honda Civic. Manual — part 669

PUMP (15A) fuse.

If the wire is OK, update the PCM if it does not have the latest software
(see UPDATING THE PCM ), or substitute a known-good PCM (see
SUBSTITUTING THE PCM ), then recheck. If the symptom/indication
goes away with a known-good PCM, replace the original PCM, refer to
the ECM/PCM REPLACEMENT .

8. Disconnect the under-dash fuse/relay box 12P connector.
9. Connect under-dash fuse/relay box 12P connector terminal No. 12 to body

ground with a jumper wire.

Fig. 40: Connecting Under-Dash Fuse/Relay Box 12P Connector Terminal
No. 12 To Body Ground With Jumper Wire

10. Check for continuity between body ground and fuel shut-off solenoid valve

relay 5P connector terminal No. 1.

Fig. 41: Checking Continuity Between Body Ground And Fuel Shut-Off
Solenoid Valve Relay

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX

Is there continuity?

YES -Replace the under-dash fuse/relay box, refer to the UNDER-DASH
FUSE/RELAY BOX (ALL EXCEPT HYBRID) .

NO -Repair open in the wire between the under-dash fuse/relay box and the
fuel shut-off solenoid valve relay.

11. Turn the ignition switch OFF.
12. Remove the injector control module relay (A).

Fig. 42: Identifying Injector Control Module Relay

13. Check for continuity between injector control module relay 5P connector

terminal No. 2 and fuel shut-off solenoid valve relay 5P connector terminal No.
5.

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX

Fig. 43: Checking Continuity Between Module Relay Terminals And Fuel
Shut-Off Solenoid Terminals

Is there continuity?

YES -Do the injector control module relay circuit troubleshooting (see
INJECTOR CONTROL MODULE RELAY CIRCUIT
TROUBLESHOOTING ).

NO -Repair open in the wire between the injector control module relay and the
fuel shut-off solenoid valve relay.

14. Check for continuity between fuel shut-off solenoid valve relay 5P connector

terminal No. 3 and body ground.

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX

Fig. 44: Checking Continuity Between Fuel Shut-Off Solenoid Valve Relay
5P Connector Terminals

Is there continuity?

YES -Go to step 15.

NO -Repair open in the wire between the fuel pressure regulator switch and the
fuel shut-off solenoid valve relay. If the wire is OK, replace the fuel pressure
switch (see FUEL PRESSURE SWITCH REPLACEMENT ).

15. Reinstall the fuel shut-off solenoid valve relay.
16. Turn the ignition switch ON (II).
17. Measure voltage between fuel shut-off solenoid valve relay 5P connector

terminal No. 3 and body ground.

Fig. 45: Measuring Voltage Between Fuel Shut-Off Solenoid Valve Relay
5P Connector Terminals

Is there battery voltage?

YES -Go to step 18.

NO -Replace the fuel shut-off solenoid valve relay.

18. Turn the ignition switch OFF.
19. Disconnect the fuel shut-off solenoid valve 2 2P connector (see FUEL

PRESSURE REGULATOR P1 REPLACEMENT ).

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX