Fuel Gauge Sending Unit Test

NOTE: For the fuel gauge system circuit diagram, refer to the gauges circuit diagram.

1.Check the No. 3 (7.5 A) fuse in the under-dash fuse/relay box before testing.

2.Turn the ignition switch OFF.

3.Remove the access panel from the floor.

4.Disconnect the fuel pump 5P connector.

5.Measure voltage between fuel pump 5P connector terminals No. 1 and No. 2 with the ignition switch ON (II). There should be battery voltage.

  • If the voltage is as specified, go to 6.
  • If the voltage is not as specified, check for:
    • an open in the YEL/BLK or BLK wire.
    • poor ground (G402).

 

6.Turn the ignition switch OFF.

7.Install a 2 W resistor between fuel pump 5P connector terminals No. 1 and No. 2, then turn the ignition switch ON (II).

 

8.Check that the pointer of the fuel gauge indicates ‘‘F''.

  • If the pointer of the fuel gauge does not indicates ‘‘F'', replace the gauge.
  • If the gauge is OK, inspect the fuel gauge sending unit.

NOTE: The pointer of the fuel gauge returns to the bottom on the gauge dial when the ignition switch is OFF regardless of the fuel level.

9.Remove the fuel tank unit.

10.Measure the resistance between the No. 1 and No. 2 terminals with the float at E (EMPTY), 1/2 (HALF FULL), and F (FULL) positions.
If you do not get the following readings, replace the fuel gauge sending unit.

Float Position 1/2 LOW 
Resistance (W11
-13 
68.5
-74.5 
112.1- 125.4 130
-132