DTC B1500: Fuel Sender Open/Short-Circuit Detection

DTC detecting condition: 

The fuel gauge circuit is open or shorted.

Trouble symptom: 

• Defective fuel gauge.
• Fuel level warning light blinks.

Wiring diagram: 

Fuel gauge system Refer to WIRING SYSTEM>FUEL GAUGE SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC. 

   Read the DTC of the combination meter using the Subaru Select Monitor. Refer to COMBINATION METER (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B1500 displayed? (Current malfunction)

   Yes:  Go to  2.

   No:  Go to  7.

2. CHECK COMBINATION METER. 
   1. Check the operation of combination meter using Subaru Select Monitor.
   2. From the {System Operation Check Mode}, select the «Fuel Meter Operation» and «Remaining fuel warning». Refer to COMBINATION METER (DIAGNOSTICS)>SYSTEM OPERATION CHECK MODE .

   Is the operation of combination meter OK?

   Yes:  Go to  3.

   No:  Replace the combination meter. Refer to INSTRUMENTATION/DRIVER INFO>COMBINATION METER .

3. CHECK HARNESS. 
   1. Turn the ignition switch to OFF.
   2. Disconnect the combination meter connector and the fuel sub level sensor connector and the fuel level sensor connector.
   3. Using the tester, measure the resistance between terminals.

      Connector & terminal 

      Engine type: FA 

      (i10) No. 25 - (R59) No. 1:

      (i10) No. 37 - (R58) No. 2:

      Engine type: EJ 

      (i10) No. 25 - (R59) No. 1:

      (i10) No. 37 - (R58) No. 4:

   Is the resistance 10 Ω or less?

   Yes:  Go to  4.

   No:  Repair the open circuit of harness or replace harness.

4. CHECK HARNESS. 

   Using the tester, measure the resistance between terminals.

   Connector & terminal 

   (i10) No. 25 - Chassis ground:

   (i10) No. 37 - Chassis ground:

   Is the resistance 10 Ω or less?

   Yes:  Repair the short circuit of harness or replace harness.

   No:  Go to  5.

5. CHECK FUEL SUB LEVEL SENSOR. 

   Check the fuel sub level sensor as a single part. Refer to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>FUEL SUB LEVEL SENSOR>INSPECTION . Refer to FUEL INJECTION (FUEL SYSTEMS) (STI)>FUEL SUB LEVEL SENSOR>INSPECTION .

   Is the check result OK?

   Yes:  Go to  6.

   No:  Replace the sensor.

6. CHECK FUEL LEVEL SENSOR. 

   Check the fuel level sensor as a single part. Refer to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>FUEL LEVEL SENSOR>INSPECTION . Refer to FUEL INJECTION (FUEL SYSTEMS) (STI)>FUEL LEVEL SENSOR>INSPECTION .

   Is the check result OK?

   Yes:  Go to  7.

   No:  Replace the sensor.

7. CHECK CONNECTOR. 
   1. Turn the ignition switch to OFF.
   2. Disconnect connectors.

   Is there poor contact of connector?

   Yes:  Repair or replace the poor contact of connector.

   No:  Go to  8.

8. CHECK CURRENT DATA. 

   Using the Subaru Select Monitor, display the «Fuel level resistance» from {Data Monitor}. Refer to COMBINATION METER (DIAGNOSTICS)>READ CURRENT DATA .

   Does the data display 10 - 570 Ω?

   Yes:  System is normal.

   No:  Replace the combination meter. Refer to INSTRUMENTATION/DRIVER INFO>COMBINATION METER .