Honda Civic. Manual — part 673

Fig. 63: Identifying Injector Control Module Relay

4. Connect injector control module relay 5P connector terminal No. 3 to body

ground with a jumper wire.

Fig. 64: Connecting Injector Control Module Relay 5P Connector
Terminal No. 3 To Body Ground With Jumper Wire

5. Jump the SCS line with the HDS.
6. Disconnect PCM connector A (44P).
7. Check for continuity between body ground and PCM connector terminal A15.

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX

Fig. 65: Checking Continuity Between Body Ground And PCM Connector
Terminal A15

Is there continuity?

YES -Go to step 8.

NO -Repair open in the wire between the injector control module relay and the
PCM (A15).

8. Measure voltage between injector control module relay 5P connector terminal

No. 1 and body ground.

Fig. 66: Measuring Voltage Between Injector Control Module Relay 5P
Connector Terminal No. 1 And Body Ground

Is there battery voltage?

YES -Go to step 9.

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX

NO -

Repair open in the wire between the injector control module relay and the
No. 5 +B INJ (15 A) fuse in the under-dash fuse/relay box. Also replace
the No. 5 +B INJ (15 A) fuse in the under-dash fuse/relay box.

Repair open in the wire between the No. 5 +B INJ (15 A) fuse in the
under-dash fuse/relay box and the No. 5 +B OP MAIN (80 A) fuse in the
under-hood fuse/relay box. Also replace the No. 5 +B OP MAIN (80 A)
fuse in the under-hood fuse/relay box.

If needed, replace the under-hood fuse/relay box, refer to the UNDER-
HOOD FUSE/RELAY BOX (ALL EXCEPT HYBRID) , or the under-
dash fuse/relay box, refer to the UNDER-DASH FUSE/RELAY BOX
(ALL EXCEPT HYBRID) .

9. Turn the ignition switch ON (II).

10. Measure voltage between injector control module relay 5P connector terminal

No. 5 and body ground.

Fig. 67: Measuring Voltage Between Injector Control Module Relay 5P
Connector Terminal No. 5 And Body Ground

Is there battery voltage?

YES -Go to step 11.

NO -Repair open in the wire between the injector control module relay and
PGM-FI main relay 1.

11. Turn the ignition switch OFF.

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX

12. Reconnect the injector control module relay and PCM connector A (44P).
13. Open the SCS line with the HDS.
14. Turn the ignition switch ON (II).
15. Measure voltage between injector control module relay 5P connector terminal

No. 2 and body ground.

Fig. 68: Measuring Voltage Between Injector Control Module Relay 5P
Connector Terminal No. 2 And Body Ground

Is there battery voltage?

YES -Repair open in the wire between the injector control module relay, the
injector control module, the injector, or the fuel shut-off solenoid valve relay.

NO -Go to step 16.

16. Test the injector control module relay (see POWER RELAY TEST ).

Is the injector control module relay OK?

YES -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 .

NO -Replace the injector control module relay.

LEAK INSPECTION

2008 Honda Civic GX

2006-08 ENGINE PERFORMANCE Fuel Supply System - Civic GX