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Fuel Gauge Sending Unit Test

NOTE: For the fuel gauge system circuit diagram, refer to the Gauges Circuit Diagram.
  1. Check the No. 5 INSTRUMENT LIGHT BACK UP LIGHT (7.5 A) fuse in the under-dash fuse/relay box.
    • If the fuse is OK, check for an open in the YEL wire between the gauge assembly and the No. 5 INSTRUMENT LIGHT BACK UP LIGHT (7.5 A) fuse.
    • If the fuse is blown, replace it, and check for an open in the YEL wire between the gauge assembly and the No. 5 INSTRUMENT LIGHT BACK UP LIGHT (7.5 A) fuse.
  2. Remove the rear tray (see TRIM REMOVAL/INSTALLATION - REAR TRAY AREA ).
  3. Remove the access panel from the floor.
  4. Disconnect fuel pump 5P connector.
  5. Measure voltage between fuel pump 5P connector terminals No. 1 and No. 2 with the ignition switch ON (II). There should be about 5 to 8 V.
    • If the voltage is as specified, go to step 6.
    • If the voltage is not as specified, check for:
      • an open or short in the YEL/BLK or BLK wire.
      • poor ground (G 601).
      • a faulty main printed circuit board in the gauge assembly.
        Fig 1: Measuring Voltage Between Fuel Pump 5P Connector Terminals No. 1 And No. 2 With Ignition Switch On (II)
        G03692797Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Turn the ignition switch OFF.
  7. Remove the bolts and the fuel tank unit (see FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT  ).
  8. Measure the resistance between the No. 1 and No. 2 terminals with the float at E (EMPTY), LOW (LOW FUEL INDICATOR LIGHT IS ON), 1/2 (HALF FULL) and F (FULL) positions.

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

    FLOAT POSITION REFERENCE CHART

    Float Position Resistance (ohm;) Height (mm) (in.)
    F 11-13 82.9+/-1.9 (3.26+/-0.0748)
    1/2 52-58 154.2+/-1.2 (6.07+/-0.0472)
    LOW 114.4-120.4 215.5 (8.48)
    E 130-132 222.8+/-1.9 (8.77+/-0.0748)
    Fig 2: Measuring Resistance Between No. 1 And No. 2 Terminals With Float
    G03692798Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. To prevent the fuel pump from running, remove the No. 2 FUEL PUMP SRS (15 A) fuse from the under-dash fuse/relay box.
  10. Connect the fuel pump 5P connector.
  11. Turn the ignition switch ON (II) with the float at F (FULL) position.
    • If the fuel gauge indicates "F", the system is OK.
    • If the fuel gauge does not indicate "F", replace the gauge assembly.
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