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Home >> Acura >> 2014 >> TSX Special Edition, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Fuel Supply System (4-CYL) >> Fuel Gauge Sending Unit Test

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. 5 METER (7.5 A) fuse in the driver's under-dash fuse/relay box before testing.
  2. Check for body electrical system DTCs.
    • If no problem is found, go to step 3.
    • If DTC B1175 or B1176 is indicated, go to the indicated DTCs troubleshooting.
  3. Turn the ignition switch to LOCK (0).
  4. Remove the rear seat; sedan model (see REAR SEAT REMOVAL/INSTALLATION - SEDAN ), sport wagon model (see REAR SEAT REMOVAL/INSTALLATION - SPORT WAGON ).
  5. Remove the access panel (A) from the floor.
    Fig 1: Identifying Access Panel And Fuel Tank Unit 4P Connector
    G07767987Courtesy 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 PUR wire to ground.
      • an open in the PUR or ORN wire.
    Fig 2: Identifying Fuel Tank Unit 4P Connector
    G07767988Courtesy 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 PRESSURE REGULATOR REPLACEMENT ).

    TERMINAL RESISTANCE REFERENCE CHART

    Float Position F 6.1 in (155.2 mm) 1/2 3.8 in (97.6 mm) LOW 1.6 in (40.8 mm) E 0.6 in (15.9 mm)
    Resistance (Q) 19 to 21 202.4 to 212.4 503.5 to 614.3 772 to 788
    Fig 3: Measuring Resistance Between Fuel Tank Unit 4P Connector Terminals No. 1 And No. 3
    G07767989Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Reconnect the fuel tank unit 4P connector.
  12. Remove the No. 15 BACK UP (10 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 is turned to ACC (I) or LOCK (0), regardless of the fuel level.
    • Remove the No. 15 BACK UP (10 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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