Honda Civic. Manual — part 685

Fig. 4: Setting Float To E Position (With Specifications)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

21. Check the fuel gauge.

Does the gauge move to the empty position?

YES - Go to step 29.

NO - Replace the gauge control module (tach) (see TACHOMETER ), then
go to step 22.

22. Turn the ignition switch OFF.
23. Reconnect all connectors.
24. Install the parts in the reverse order of removal.
25. Turn the ignition switch ON (II).
26. Reset the ECM/PCM with the HDS.
27. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN

PROCEDURE ).

28. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0462 indicated?

YES - Check for poor connections or loose terminals at the gauge control
module (tach) and the fuel gauge sending unit, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are

2008 Honda Civic GX

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

indicated, go to the indicated DTC's troubleshooting.

29. Update the ECM/PCM if it does not have the latest software (see UPDATING

ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING
THE ECM/PCM ).

30. Reconnect all connectors.
31. Install the parts in the reverse order of removal.
32. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0462 indicated?

YES - Check for poor connections or loose terminals at the gauge control
module (tach) and the fuel gauge sending unit. If the ECM/PCM was updated,
substitute a known-good ECM/PCM (see SUBSTITUTING THE
ECM/PCM ), then recheck. If the ECM/PCM was substituted, go to step 1.

NO - If the ECM/PCM was updated, troubleshooting is complete. If the
ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM
REPLACEMENT ). If any other Temporary DTCs or DTCs are indicated, go
to the indicated DTC's troubleshooting.

DTC P0463: FUEL LEVEL SENSOR (FUEL GAUGE SENDING UNIT) CIRCUIT HIGH VOLTAGE

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS, and wait 5 seconds.
3. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0463 indicated?

YES - Go to step 4.

IMO-Intermittent failure, the system is OK at this time. Check for poor

NOTE:

Before you troubleshoot, record all freeze data and any on-
board snapshot, and review the general troubleshooting
information (see GENERAL TROUBLESHOOTING
INFORMATION ).

2008 Honda Civic GX

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

connections or loose terminals at the gauge control module (tach) and the fuel
gauge sending unit.

4. Turn the ignition switch OFF.
5. Remove the rear seat cushion (see REAR SEAT

REMOVAL/INSTALLATION ).

6. Remove the rear floor upper cross-member and the access panel from the floor

(see FUEL TANK UNIT REMOVAL/INSTALLATION ).

7. Disconnect the fuel tank unit 4P connector.
8. Connect fuel tank unit 4P connector terminal No. 3 to body ground with a

jumper wire.

Fig. 5: Connecting Fuel Tank Unit 4P Connector Terminal No. 3 To Body
Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

9. Remove the gauge control module (tach) (see TACHOMETER ).

10. Disconnect the gauge control module (tach) 36P connector.
11. Check for continuity between gauge control module (tach) 36P connector

terminal No. 33 and body ground.

2008 Honda Civic GX

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

Fig. 6: Checking Continuity Between Gauge Control Module (TACH)
Terminal No. 33 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 12.

NO - Repair open in the wire between the gauge control module (tach) (GND
line) and the fuel gauge sending unit, then go to step 24.

12. Connect fuel tank unit 4P connector terminal No. 1 to body ground with a

jumper wire.

Fig. 7: Connecting Fuel Tank Unit 4P Connector Terminal No. 1 To Body
Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

13. Check for continuity between gauge control module (tach) 36P connector

terminal No. 32 and body ground.

2008 Honda Civic GX

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