Check Fuel Level Sensor

WARNING: This page is about a different car, the 2008 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK THE COMMUNICATION STATUS. Connect the Subaru Select Monitor and then turn the ignition switch and Subaru Select Monitor to ON. Read the DTC of the body integrated unit. <Ref. to OPERATION , Subaru Select Monitor . >	Is DTC being displayed?	Perform the diagnosis according to DTC. <Ref. to LIST , List of Diagnostic Trouble Code (DTC) . >	Go to step 2 .
2 CHECK COMBINATION METER. Remove the fuel sub level sensor. <Ref. to REMOVAL , Fuel Level Sensor for H4SO engine. > <Ref. to REMOVAL , Fuel Level Sensor for H4DOTC engine. > Short the fuel sub level sensor connector terminal to the chassis ground using a suitable lead line wire with 100 CI resistance connected between connector terminal and chassis ground. Turn the ignition switch to ON. Terminals (R59) No. 1 - Chassis ground:	Is the fuel gauge display in combination meter changed to FULL?	Go to step 3.	Check harness for open or short circuits, and if normal, replace the meter case assembly.
3 CHECK FUEL LEVEL SENSOR. Remove the fuel level sensor. <Ref. to REMOVAL , Fuel Level Sensor for H4SO engine. > <Ref. to REMOVAL , Fuel Level Sensor for H4DOTC engine. > Measure the resistance between fuel level sensor terminals when the float is in FULL or EMPTY position. Terminals (R58) No. 1 - No. 4:	Is the resistance 1.0 to 3.0 Ω (FULL) and 31 to 33 Ω (EMPTY)?	Go to step 4.	Replace the fuel level sensor.
4 CHECK FUEL SUB LEVEL SENSOR. Remove the fuel sub level sensor. <Ref. to REMOVAL , Fuel Sub Level Sensor for H4SO engine. > <Ref. to REMOVAL , Fuel Sub Level Sensor for H4DOTC engine. > Measure the resistance between fuel sub level sensor terminals when the float is in FULL or EMPTY position. Terminals (R59) No. 1 - No.2:	Is the resistance 1.0 to 3.0 Ω (FULL) and 61 to 63 Ω (EMPTY)?	Go to step 5.	Replace the fuel sub level sensor.
5 CHECK HARNESS BETWEEN FUEL SUB-LEVEL SENSOR AND BODY INTEGRATED UNIT. Disconnect the connector from body integrated unit. Measure the resistance between the fuel sub level sensor harness connector terminal and body integrated unit harness connector terminal. Connector & terminal (R59) No. 1 - (B281) No. 7:	Is resistance less than 10 Ω?	Go to step 6.	Repair the wiring harness.
6 CHECK HARNESS BETWEEN FUEL LEVEL SENSOR AND FUEL SUB LEVEL SENSOR. Measure the resistance between fuel level sensor harness connector terminal and fuel sub level sensor harness connector terminal. Connector & terminal (R58) No. 1 - (R59) No. 2:	Is the resistance less than 10 Ω?	Go to step 7.	Repair the wiring harness.
7 CHECK FUEL LEVEL SENSOR GROUND CIRCUIT. Measure the resistance between fuel level sensor harness connector terminal and chassis ground. Connector & terminal (R58) No. 4 - Chassis ground:	Is resistance less than 10 Ω?	Replace the meter case assembly.	Repair the wiring harness.