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Fuel Gauge Sending Unit Test

NOTE: For the fuel gauge system circuit diagram, refer to the Gauges Circuit Diagram (see DTC TROUBLESHOOTING INDEX ).
  1. Check the No. 5 INSTRUMENT LIGHT BACK UP LIGHT (7.5 A) fuse in the under-dash fuse/relay box before testing.
  2. Do the DTC troubleshooting (see HOW TO CHECK FOR DTCS WITH THE HONDA DIAGNOSTIC SYSTEM (HDS) ('06 MODEL) ).
    • If no problem is found, go to step 3.
    • If DTC B1175 or B1176 is indicated, go to the indicated DTC's troubleshooting
  3. Turn the ignition switch OFF.
  4. Remove the rear tray (see TRIM REMOVAL/INSTALLATION - REAR TRAY AREA ).
  5. Remove the access panel (A) from the floor.
    Fig 1: Removing Access Panel From Floor And Disconnecting Fuel Tank Unit 5P Connector
    G03693282Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Disconnect the fuel tank unit 5P connector (B).
  7. Measure voltage between fuel tank unit 5P connector terminals No. 1 and No. 2 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/WHT wire.
        Fig 2: Measuring Voltage Between Fuel Tank Unit 5P Connector Terminals No 1 And No 2
        G03693283Courtesy 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/INSTALLATION  ).
  10. 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 FULL), and F (FULL) positions.

    If you do not get the following readings, replace the fuel gauge sending unit (see FUEL TANK UNIT REMOVAL/INSTALLATION  ).

    FLOAT POSITION SPECIFICATION CHART

    Float Position F 3.2 in. (81.2 mm) 1/2 6.0 in. (152 mm) LOW 8.4 in. (214.3 mm) E 8.7 in. (221.9 mm)
    Resistance (Ω) 11 to 13 52 to 58 114.4 to 120.4 130 to 132
    Fig 3: Measuring Resistance Between Fuel Tank Unit 5P Connector Terminals No 1 And No 2
    G03693284Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Reconnect the fuel tank unit 5P connector.
  12. Remove the No. 2 FUEL PUMP (15 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 assembly.
    • 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. 2 FUEL PUMP (15 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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