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Fuel Gauge Sending Unit Test

Special Tools Required 

Fuel sender wrench 07AAA-S0XA100

NOTE: For the fuel gauge sending system circuit diagram, refer to the gauges circuit diagram (see CIRCUIT DIAGRAM ).
  1. Check the No. 9 BACK UP LIGHT INSTRUMENT LIGHT (10 A) fuse in the driver's under-dash fuse/relay box before testing.
  2. Turn the ignition switch OFF.
  3. Remove the driver's side second row seat (see SECOND ROW SEAT REMOVAL/INSTALLATION ).
  4. Cut the carpet, then remove the access panel from the floor (see FUEL TANK UNIT REMOVAL/INSTALLATION  ).
  5. Remove the access panel (A) from the floor, then disconnect the fuel pump 5P connector (B).
    Fig 1: Removing Access Panel From Floor
    G04546192Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Measure voltage between fuel pump 5P connector terminals No. 1 and No. 2 with the ignition switch ON (II). There should be battery voltage.
    • If the voltage is as specified, go to step 7.
    • If the voltage is not as specified, check for:
      • an open in the ORN/WHT or BLK/YEL wire.
      • poor ground (G505).
        Fig 2: Measuring Voltage Between Fuel Pump 5P Connector Terminals No. 1 And No. 2
        G04546193Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Turn the ignition switch OFF.
  8. Install a 2 Ω resistor between fuel pump 5P connector terminals No. 1 and No. 2.
    Fig 3: Installing 2 Ω Resistor Between Fuel Pump 5P Connector Terminals No. 1 And No. 2
    G04546194Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Turn the ignition switch ON (II).
  10. Check that the pointer of the fuel gauge indicates "F".
    • If the pointer of the fuel gauge does not indicate "F", replace the gauge.
    • If the gauge is OK, inspect the fuel gauge sending unit.
    NOTE: The pointer of the fuel gauge returns to the bottom on the gauge dial when the ignition switch is OFF, regardless of the fuel level.
  11. Turn the ignition switch OFF.
  12. Remove the driver's side second row seat (see SECOND ROW SEAT REMOVAL/INSTALLATION ).
  13. Cut the carpet (be careful not to cut the wire harness), then remove the access panel from the floor (see FUEL TANK UNIT REMOVAL/INSTALLATION  ).
  14. Disconnect the fuel pump 5P connector.
  15. Remove the fuel fill cap.
  16. Relieve the fuel pressure (see FUEL PRESSURE RELIEVING  ).
  17. Disconnect the quick-connect fittings from the fuel tank unit.
  18. Using the special tool, loosen the fuel tank unit locknut (A). Remove the fuel tank unit.
    Fig 4: Loosening Fuel Tank Unit Locknut Using Special Tool
    G04546195Courtesy of AMERICAN HONDA MOTOR CO., INC.
  19. Measure resistance between the No. 1 and No. 2 terminals with the float at E (EMPTY), L (LOW), 1/2 (HALF FULL), and F (FULL) positions.

    If you do not get the following readings, replace the fuel gauge sending unit.

    RESISTANCE SPECIFICATIONS

    Float Position Resistance (Ω)
    F 19-21
    1/2 185-195
    LOW 484-613
    E 770-790
    Fig 5: Measuring Resistance Between No. 1 And No. 2 Terminals
    G04546196Courtesy of AMERICAN HONDA MOTOR CO., INC.
  20. If the resistance is not as specified, replace the fuel gauge sending unit (see FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT  ).
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