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 Ref. 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. Ref. 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». Ref. to COMBINATION METER (DIAGNOSTICS)>System Operation Check Mode .

   Is the operation of combination meter OK?

   Yes Go to 3  .

   No Replace the combination meter. Ref. 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. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Fuel Sub Level Sensor>INSPECTION . Ref. 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. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Fuel Level Sensor>INSPECTION. Ref. 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}. Ref. to COMBINATION METER (DIAGNOSTICS)>Read Current Data .

   Does the data display 10 - 570 Ω?

   Yes System is normal.

   No Replace the combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>Combination Meter .