Fuel Filter Water Level Switch Test

1.Do the gauge drive circuit check.

  • If the fuel gauge needle sweeps from the minimum to maximum position and then returns to minimum the gauge is OK. Go to 2.
  • If the fuel gauge needle does not sweep correctly, replace the gauge assembly and retest.

2.Bleed the fuel filter water.

3.Start the engine, then check the engine condition.

  • If the engine condition is OK, go to 4.
  • If the engine condition is not OK, do the symptom troubleshooting.

4.Turn the ignition switch OFF.

5.Disconnect the fuel filter water level switch 2P connector (A).

 

6.Connect fuel filter water level switch 2P connector terminal No. 2 to body ground with a jumper wire.

 

7.Turn the ignition switch ON (II), and then check the water in diesel filter warning indicator.

  • If the water in diesel filter warning indicator is on, repair open in the BLK wire between the fuel filter water level switch and G201. If wire is OK, go to 8.
  • If the water in diesel filter warning indicator is not on, repair open in the RED/BLU wire between the fuel filter water level switch and the gauge assembly.

8.Turn the ignition switch OFF.

9.Remove the fuel filter water level switch from the fuel filter.

10.Check the float movement of the fuel filter water level switch.


11.Connect the fuel filter water level switch 2P connector to the fuel filter water level switch.

12.Turn the ignition switch ON (II).

13.Move the float of the fuel filter water level switch, and check the water in diesel filter warning indicator.

  • If the indicator turns on when the float is at the top position, the fuel filter water level switch is OK.
  • If the indicator stays on or off when the float is at any position, replace the fuel filter water level switch.