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HOMESERVICE MANUALSACURA2008TSX STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISFUEL SUPPLY SYSTEMFUEL GAUGE SENDING UNIT TEST'04-05 MODELS
2008 Acura TSX Standard

'04-05 models

2008 Acura TSX StandardSECTION '04-05 models
NOTE: For the fuel gauge system circuit diagram, refer to CIRCUIT DIAGRAM .
  1. Check for body electrical system DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
    • If no problem is found, go to step 2.
    • If DTC B1175 is indicated, go to the DTCS TROUBLESHOOTINGΒ .
  2. Check the No. 21 METER (7.5 A) fuse in the under-dash fuse/relay box before testing.
  3. Do the gauge drive circuit check (see SELF-DIAGNOSTIC FUNCTION ).
    • If the fuel gauge needle sweeps from the minimum to maximum position and then returns to minimum, the gauge is OK. Go to step 3.
    • If the fuel gauge needle does not sweep correctly, replace the gauge assembly and retest.
  4. Turn the ignition switch OFF.
  5. Remove the trunk floor trim panel.
  6. Remove the access panel (A) from the floor.
    Fig 1: Identifying Access Panel And Fuel Tank Unit 5P Connector
    G05490827Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Disconnect the fuel tank unit 5P connector (B).
  8. Remove the fuel tank unit from the fuel tank (see FUEL TANK UNIT REMOVAL AND INSTALLATIONΒ  ).
  9. Measure resistance between the No. 1 and No. 2 terminals 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 REPLACEMENTΒ  ).

    FLOAT POSITION CHART

    Float Position F 7.6 in., (191.4 mm) 1/2 4.4 in. (113.1 mm) LOW 2.0 in. (52.4 mm) E 0.8 in. (25.6 mm)
    Resistance (Ξ©) 19 to 21 205.5 to 215.5 487.9 to 644 770 to 790
    NOTE: Remove the No. 15 BACK UP (40 A) fuse from the under-hood fuse/relay box for at least 30 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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.