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Fuel Gauge Sending Unit Test

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. Check for body electrical system DTCs (see HOW TO CHECK FOR DTCS WITH THE HONDA DIAGNOSTIC SYSTEM (HDS) ).
  3. Turn the ignition switch OFF.
  4. Remove the driver's side second row seat (see SECOND ROW SEAT REMOVAL/INSTALLATION ).
  5. Cut the carpet, being careful not to cut the wire harness underneath it, then remove the access panel from the floor (see FUEL TANK UNIT REMOVAL/INSTALLATION  ).
  6. Remove the access panel (A) from the floor.
    7. Fig 1: Removing Access Panel From Floor & Disconnecting Fuel Pump 5P Connector
    G04245499Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Disconnect the fuel tank unit 5P connector (B).
  8. Measure voltage between fuel pump 5P connector terminals No. 1 and No. 2. There should be battery voltage.
    • If the voltage is OK, go to step  9.
    • If the voltage is not as specified, check for:
      • a short in the ORN/WHT wire to ground.
      • an open in the ORN/WHT or BLK/YEL wire..
        Fig 2: Measuring Voltage Between Fuel Pump 5P Connector Terminals No. 1 & No. 2
        G04245500Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Turn the ignition switch OFF.
  10. Remove the fuel tank unit from the fuel tank (see Removal ).
  11. Measure resistance between fuel tank unit 5P connector terminals No. 1 and No. 2 with the float at E (EMPTY), LOW (LOW FUEL INDICATOR), 1/2 (HALF PULL), 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 RESISTANCE SPECIFICATION

    Float Position F 1/2 LOW E
    8.3 in. (211.4 mm) 5.6 in. (143.1 mm) 1.8 in. (45.2 mm) 0.6 in. (16.2 mm)
    Resistance (Ω) 19 to 21 185 to 195 483.7 to 612.8 770 to 790
    Fig 3: Measuring Resistance Between No. 1 & No. 2 Terminals
    G04245503Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Reconnect the fuel tank unit 5P connector.
  13. Remove the No. 13 BACK UP (7.5 A) fuse from the passenger's under-dash 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 control module (see STEERING HANGER BEAM REPLACEMENT ).
    • If the gauge is OK, the test is complete.
    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. 13 BACK UP (7.5 A) fuse from the passenger's under-dash 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.
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