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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. 21 IG METER (7.5 A) fuse in the under-dash fuse/relay box before testing.
  2. Do the B-CAN system diagnosis Test Mode A troubleshooting (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
    • If no problem is found, go to step 3.
    • If DTC B1175 is indicated, go to the indicated DTC's troubleshooting.
  3. Turn the ignition switch OFF.
  4. Remove the trunk floor.
  5. Remove the access panel (A) from the floor.
    Fig 1: Identifying Access Panel And Fuel Pump 5P Connector
    G05458332Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Disconnect the fuel pump 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
        G05458333Courtesy 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 the No. 1 and No. 2 terminals with the float at E (EMPTY), 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 AND RESISTANCE CHART

    Float Position F 7.6 in. (191.4 mm) 1/2 4.4 in. (113.1 mm) LOW 1.8 in. (46.5 mm) E 0.8 in. (25.6 mm)
    Resistance (Ω) 19 to 21 205.5 to 215.5 543.4 to 670.9 770 to 790
    Fig 3: Measuring Resistance Between No. 1 And No. 2 Terminals
    G05458334Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Reconnect the fuel tank unit 5P connector.
  12. Remove the No. 15 BACK UP (40 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. 15 BACK UP (40 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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