Fuel Gauge Sending Unit Test

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

Do multiplex integrated control system troubleshooting test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
- If no problem is found, go to step 2.
- If DTC B1175 is indicated, go to the DTC B1175 troubleshooting (see DTC B1175: FUEL LEVEL SENSOR (FUEL GAUGE SENDING UNIT) CIRCUIT OPEN ).
Check the No. 21 METER (10 A) fuse in the driver's under-dash fuse/relay box.
Do the gauge drive circuit check (see THE INDICATOR DRIVE CIRCUIT CHECK ).
- If the fuel gauge needle sweeps from the minimum to maximum position and then returns to minimum, the gauge is OK. Go to step 4.
- If the fuel gauge needle does not sweep correctly, replace the gauge control module and retest.
Turn the ignition switch to LOCK (0).
Remove the rear seat cushion (see REAR SEAT CUSHION COVER REPLACEMENT ).
Remove the access panel (A) from the left side of the floor.

Fig 1: Locating Access Panel And Fuel Pump 5P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the fuel pump 5P 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 the resistance between the No. 1 and No. 2 terminals of the fuel pump 5P 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 REFERENCE CHART

Float Position	F 1.1 in. (28.9 mm)	LOW 4.7 in. (118.1 mm)	E 5.7 in. (144.7 mm)
Resistance (Ω)	9 to 11	217.2 to 243	284.1 to 294.1

NOTE: Remove the No. 15 BACK UP (40 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. 2 Terminals Of Fuel Pump 5P Connector

Courtesy of AMERICAN HONDA MOTOR CO., INC.