DTC B1500: Fuel Sender Open Detected

DTC detecting condition: 

Open circuit in fuel gauge circuit

Trouble symptom: 

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

Wiring diagram: 

Fuel gauge system Ref. to WIRING SYSTEM (IMPREZA MODEL)>FUEL GAUGE SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>FUEL GAUGE SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>FUEL GAUGE SYSTEM>WIRING DIAGRAM .

• Impreza model/Crosstrek model (hybrid)

  Courtesy of SUBARU OF AMERICA, INC.

• Crosstrek model (except for hybrid)

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Read the DTC of [Combination Meter] using the Subaru Select Monitor. Ref. to COMBINATION METER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B1500 displayed? (Current malfunction)

   Yes:  Go to  2.

   No:  Go to  7.

2. CHECK COMBINATION METER  .

   Using the Subaru Select Monitor, check the following items in the [Active Test] of [Combination Meter]. Ref. to COMBINATION METER (DIAGNOSTICS)>ACTIVE TEST .

   • Fuel Meter Operation
   • Remaining fuel warning

   Is the operation of [Fuel Meter Operation] and [Remaining fuel warning] OK?

   Yes:  Go to  3.

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

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

      Connector & terminal 

      Impreza model/Crosstrek model (hybrid) 

      (i10) No. 25 - (R58) No. 1:

      (i10) No. 26 - (R58) No. 4:

      Crosstrek model (except for hybrid) 

      (i10) No. 25 - (R58) No. 1:

      (i10) No. 26 - (R59) No. 2:

      (R58) No. 4 - (R59) No. 1:

      Is the resistance 10 Ω or less?

   Yes:  Go to  4.

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

4. CHECK HARNESS (GROUND SHORT CIRCUIT)  .

   Using the tester, measure the resistance between terminals.

   Connector & terminal 

   (i10) No. 25 - Chassis ground:

   (i10) No. 26 - 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 LEVEL SENSOR  .

   Check the fuel sub level sensor as a single part. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL LEVEL SENSOR . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO(HEV))>FUEL LEVEL SENSOR .

   Is the check result OK?

   Yes:  For the Impreza model/Crosstrek model (hybrid), Go to  7. For the Crosstrek model (other than hybrid), Go to  6.

   No:  Replace the sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL LEVEL SENSOR . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO(HEV))>FUEL LEVEL SENSOR .

6. CHECK FUEL SUB LEVEL SENSOR  .

   Check the fuel sub level sensor as a single part. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL SUB LEVEL SENSOR .

   Is the check result OK?

   Yes:  Go to  7.

   No:  Replace the sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL SUB LEVEL 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 DATA MONITOR  .
   1. Connect each connector.
   2. Turn the ignition switch to ON.
   3. Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Combination Meter]. Ref. to COMBINATION METER (DIAGNOSTICS)>DATA MONITOR .
      • Fuel level resistance

   Does [Fuel level resistance] indicate 0 - 480 ohm?

   Yes:  Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

   NOTE:

   In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause. 

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