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Fuel Gauge Sending Unit Test

NOTE: For the fuel gauge system circuit diagram, refer to the Gauges Circuit Diagram (see CIRCUIT DIAGRAM ).
  1. Check the No. 3 IG METER (10 A) fuse in the 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 center console (see CENTER CONSOLE REMOVAL/INSTALLATION ).
  5. Remove the access panel (A) from the floor.
    Fig 1: Identifying Access Panel And Fuel Tank Unit 4P Connector
    G05454822Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Disconnect the fuel tank unit 4P connector (B).
  7. Measure voltage between fuel tank unit 4P connector terminals No. 1 and No. 3 with the ignition switch ON (II). There should be battery voltage.
    • If the voltage is OK, go to step  8.
    • If the voltage is not as specified, check for:
      • a short in the YEL/BLK wire to ground.
      • an open in the YEL/BLK or BLK wire.
        • Fig 2: Measuring Voltage Between Fuel Tank Unit 4P Connector Terminals
        G05454823Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Turn the ignition switch OFF.
  9. Remove the fuel tank unit from the fuel tank (see FUEL TANK UNIT REMOVAL AND INSTALLATION ).
  10. 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 CHART

    Float Position F 4.6 in. (116.7 mm) 1/2 2.4 in. (63.2 mm) LOW 0.9 in. (23.1 mm) E 0.7 in. (18.5 mm)
    Resistance (Ω) 19 to 21 194.1 to 204.1 554.2 to 714.3 773 to 787
    Fig 3: Measuring Resistance Between Fuel Tank Unit 4P Connector Terminals
    G05454824Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Reconnect the fuel tank unit 4P connector.
  12. Remove the No. 8 BACK UP (10 A) fuse from the under-hood fuse/relay box for at least 10 seconds, then reinstall it.
  13. Turn the ignition switch ON (II).
  14. 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 GAUGE CONTROL MODULE 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. 8 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.
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