Fuel Gauge Sending Unit Test

NOTE: For the fuel gauge system circuit diagram, refer to the Gauges Circuit Diagram (see CIRCUIT DIAGRAM ).

Check the No. 10 METER (7.5 A) fuse in the under-dash fuse/relay box before testing.
Check for body electrical system DTCs.
- If no problem is found, go to step 3.
- If DTC B1175 or B1176 is indicated, go to the indicated DTCs troubleshooting.
Turn the ignition switch OFF.
Fold the rear seat down, then remove the left rear door sill trim (see REAR DOOR SILL AREA ).
Pull back the carpet to expose the access panel (see step 9 under CARPET REPLACEMENT ).
Remove the access panel (A) from the left side of the floor.

Fig 1: Identifying Access Panel And Fuel Tank Unit 4P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the fuel tank unit 4P connector (B).
Remove the fuel tank unit from the fuel tank (see FUEL TANK UNIT REMOVAL AND INSTALLATION ).
NOTE: If the fuel tank is full, drain the fuel (see FUEL TANK DRAINING ).

Measure resistance between the No. 1 and No. 3 terminals of the fuel tank unit 4P connector with the float at E (EMPTY), LOW (LOW FUEL INDICATOR), 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 ).
If the fuel gauge sending unit test is OK, do the secondary fuel gauge sending unit test (see SECONDARY FUEL GAUGE SENDING UNIT TEST ).

FLOAT POSITION CHART

Float Position	F 5.7 in. (144.0 mm)	LOW 3.7 in. (93.7 mm)	E 2.2 in. (54.8 mm)
Resistance (Ω)	18 to 22	703.6 to 743	772 to 788

NOTE: Remove the No. 23 BACK UP (10 A) fuse from the under-hood fuse/relay box for at least 30 seconds after completing troubleshooting, otherwise it may take up to 20 minutes for the fuel gauge to indicate the correct fuel level.

Fig 2: Measuring Resistance Between No. 1 And No. 3 Terminals Of Fuel Tank Unit 4P Connector

Courtesy of AMERICAN HONDA MOTOR CO., INC.