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Home >> Acura >> 2009 >> TSX Standard >> 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 DTC's troubleshooting
  3. Turn the ignition switch to LOCK (0)
  4. Remove the rear seat cushion (see REAR SEAT CUSHION COVER REPLACEMENT )
  5. Remove the access panel (A) from the floor
    Fig 1: Identifying Access Panel And Fuel Tank Unit 4P Connector
    G05992552Courtesy 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 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
      G05992553Courtesy 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 REMOVAL )
  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 )
    RESISTANCE SPECIFICATION

    Float Position F 5 9 in (146 5 mm) 1/2 3 7 in (93 5 mm) LOW 1 6 in (38 8 mm) E 0 7m (16 6 mm)
    Resistance (Ω) 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
    G05992554Courtesy 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 assembly
    • 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) and ACC (I), 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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