Fuel Gauge Sending Unit Test

NOTE: For the fuel gauge system circuit diagram, refer to the Gauges Circuit Diagram (see CIRCUIT DIAGRAM ).

Check the B22 METER (7.5 A) fuse in the under-dash fuse/relay box, and replace it if needed.
Check for body electrical system DTCs.
- If no DTCs are found, go to step 3.
- If DTC B1175 or B1176 is indicated, go to the indicated DTC'S TROUBLESHOOTING .
Turn the ignition switch to LOCK (0).
Remove the rear tray (see step 1 on TRIM REMOVAL/INSTALLATION - REAR TRAY AREA ).
Remove the access panel (A) from the floor.

Fig 1: Identifying Access Panel And Fuel Tank Unit 4P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the fuel tank unit 4P connector (B).
Measure the voltage between fuel tank unit 4P connector terminals No. 2 and No. 4 with the ignition switch turned to ON (II). There should be 12V battery voltage.
- If the voltage is OK, go to step 8.
- If the voltage is not as specified, check for:
  - a short in the BRN wire to ground.
  - an open in the BRN or BLK wire.
    
    Fig 2: Measuring Voltage Between Fuel Tank Unit 4P Connector Terminals No. 2 And No. 4
    Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to LOCK (0).
Remove the fuel tank unit from the fuel tank (see FUEL TANK UNIT REMOVAL AND INSTALLATION ).

Measure the resistance between fuel tank unit 4P connector terminals No. 2 and No. 4 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 REFERENCE

Float Position	F 5.366 in (136.3 mm)	1/2 3.094 in (78.6 mm)	LOW 1.185 in (30.1 mm)	E 0.646 in (16.4 mm)
Resistance (Ω)	19 to 21	197.3 to 207.3	489.6 to 639.6	772 to 788

Fig 3: Measuring Resistance Between Fuel Tank Unit 4P Connector Terminals No. 2 And No. 4

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Reconnect the fuel tank unit 4P connector.
Remove the No. B1 BACK UP (15 A) fuse from the under-dash fuse/relay box for at least 10 seconds, then reinstall it.
Turn the ignition switch to ON (II).
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. B1 BACK UP (15 A) fuse from the under-dash fuse/relay box for at least 10 seconds after completing the test, otherwise it may take up to 20 minutes for the fuel gauge to indicate the correct fuel level.