LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 2012 >> Ridgeline RT >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Supply System >> Fuel Gauge Sending Unit Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 METER (7.5 A) fuse in the under-dash fuse/relay box before testing.
  2. Check the BODY ELECTRICAL DTCs with the HDS.
    • 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 to LOCK (0).
  4. Remove the rear seat-back (see REAR SEAT-BACK REMOVAL/INSTALLATION ).
  5. Remove the access panel (A) from the floor.
    Fig 1: Identifying Access Panel And Fuel Tank Unit 5P Connector
    G05964700Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Disconnect the fuel tank unit 5P connector (B).
  7. Measure the voltage between fuel tank unit 5P connector terminals No. 1 and No. 2 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 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
        G05964701Courtesy 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 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 PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT ).

    FLOAT POSITION RESISTANCE REFERENCE CHART

    Float Position F 9.6 in. (243.3 mm) 1/2 6.6 in. (166.3 mm) LOW 2.9 in. (72.5 mm) E 1.2 in. (30.1 mm)
    Resistance (Ω) 19 to 21 209.4 to 219.4 509 to 618.4 770 to 790
    Fig 3: Measuring Resistance Between Fuel Tank Unit 5P Connector Terminals No. 1 And No. 2
    G05964702Courtesy 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 to 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 in LOCK (0) or ACC (I), 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.
scientia non olet · About LEMON Manuals