Honda Civic. Manual — part 698

10. Remove the fuel tank unit from the fuel tank (see FUEL TANK UNIT

REMOVAL/INSTALLATION ).

11. Measure resistance between fuel tank unit 4P connector terminals No. 1 and

No. 3 with the float at E (EMPTY), LOW (LOW FUEL INDICATOR), 1/2
(HALF FULL), and F (FULL) positions. If you do not get the following
readings, replace the fuel gauge sending unit (see FUEL PUMP/FUEL
GAUGE SENDING UNIT REPLACEMENT ).

FLOAT POSITION RESISTANCE SPECIFICATION

Fig. 63: Measuring Resistance Between Fuel Tank Unit 4P Connector
Terminals No 1 And 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

12. Reconnect the fuel tank unit 4P connector.
13. Remove the No. 23 BACK UP (10 A) fuse from the under-hood fuse/relay box

for at least 10 seconds, then reinstall it.

14. Turn the ignition switch ON (II).
15. Check that the pointer of the fuel gauge indicates "F" with the float at F.

If the pointer of the fuel gauge does not indicate "F", replace the gauge
assembly.

Float Position

F 5.6 in.

(139.8 mm)

1/2 2.9 in.

(72.1 mm)

LOW 0.8 in.

(19.5 mm)

E 0.4 in. (8.9

mm)

Resistance

(ohms)

19 to 21

205.8 to 215.8

537.5 to 707

772 to 788

2008 Honda Civic GX

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

If the gauge is OK, the test is complete.

LOW FUEL INDICATOR TEST

1. Do the gauge self-diagnostic function (see SELF-DIAGNOSTIC

FUNCTION ).

If the low fuel indicator flashes, go to step 2.

If the low fuel indicator does not flash, replace the gauge control module
(tach) (see TACHOMETER ).

2. Check for body electrical system DTCs.

If any DTCs are indicated, do the indicated DTC's troubleshooting.

If no DTCs are indicated, go to step 3.

3. Do the fuel gauge sending unit test (see FUEL GAUGE SENDING UNIT

TEST ).

NOTE:

The pointer of the fuel gauge returns to the bottom
of the gauge dial when the ignition switch is OFF,
regardless of the fuel level.

Remove the No. 23 BACK UP (10 A) fuse from the
under-hood fuse/relay box for at least 10 seconds
after completing troubleshooting, otherwise it may
take up to 20 minutes for the fuel gauge to indicate
the correct fuel level.

2008 Honda Civic GX

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

2006-08 ACCESSORIES & EQUIPMENT

Gauges - Civic (All Except Hybrid)

COMPONENT LOCATION INDEX

Fig. 1: Locating Gauges Components

2008 Honda Civic EX

2006-08 ACCESSORIES & EQUIPMENT Gauges - Civic (All Except Hybrid)

2008 Honda Civic EX

2006-08 ACCESSORIES & EQUIPMENT Gauges - Civic (All Except Hybrid)

Fig. 2: Identifying Speedometer And Tachometer Components

2008 Honda Civic EX

2006-08 ACCESSORIES & EQUIPMENT Gauges - Civic (All Except Hybrid)