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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. 22 METER (7.5 A) fuse in the under-dash fuse/relay box before testing.
  2. Check for body electrical system DTCs.
    • If no DTCs 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 to LOCK (0).
  4. Remove the rear seat cushion (see REAR SEAT REMOVAL/INSTALLATION ).
  5. Remove the access panel (A) from the floor.
    Fig 1: Identifying Access Panel And Fuel Tank Unit 4P Connector
    G08092573Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Disconnect the fuel tank unit 4P connector (B).
  7. Measure the voltage between fuel tank unit 4P connector terminals No. 1 and No. 3 with the ignition switch turned to 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 LT GRN wire to ground.
      • an open in the LT GRN or BLK wire.
        Fig 2: Identifying Fuel Tank Unit 4P Connector Terminals
        G08092574Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Turn the ignition switch to LOCK (0).
  9. Remove the fuel tank unit from the fuel tank (see FUEL TANK UNIT REMOVAL AND INSTALLATION ).
  10. Measure the 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 F 136.2 mm (5.4 in) 1/2 78.5 mm (3.1 in) LOW 30.1 mm (1-2 in) E 16.4 mm (0.6 in)
    Resistance (Ω) 19 to 21 202.9 to 212.9 508.3 to 653.1 772 to 788
    Fig 3: Identifying Float Position
    G08092575Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Reconnect the fuel tank unit 4P connector.
  12. Remove the No. 1 BACK UP (15 A) fuse from the under-dash fuse/relay box for at least 10 seconds, then reinstall it.
  13. Turn the ignition switch to ON (II).
  14. Check that the fuel gauge indicates F with the float at F.
    • If the fuel gauge does not indicate F, replace the gauge control module.
    • If the gauge is OK, the test is complete.
    NOTE: Remove the No. 1 BACK UP (15 A) fuse from the 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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