DTC B1500: Fuel Sender Open Detected

DTC detecting condition:

The fuel gauge circuit is open or shorted.

Trouble symptom:

Defective fuel gauge.
Fuel level warning light blinks.

Wiring diagram:

Combination meter system Ref. to WIRING SYSTEM>COMBINATION METER SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to COMBINATION METER (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

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.
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 .
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
  
  (i97) No. 25 - (R132) No. 1:
  
  (i97) No. 26 - (L103) No. 2:
  
  (R132) No. 4 - (L103) No. 1:
Is the resistance 10 Ω or less?

Yes : Go to 4.

No : Repair the open circuit of harness or replace harness.
CHECK HARNESS (GROUND SHORT CIRCUIT) .
Using the tester, measure the resistance between terminals.

Connector & terminal

(i97) No. 25 - Chassis ground:

(i97) 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.
CHECK FUEL LEVEL SENSOR .
Check the fuel level sensor as a single part. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>FUEL LEVEL SENSOR . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>FUEL LEVEL SENSOR .

Is the check result OK?

Yes : Go to 6.

No : Replace the sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>FUEL LEVEL SENSOR . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>FUEL LEVEL SENSOR .
CHECK FUEL SUB LEVEL SENSOR .
Check the fuel sub level sensor as a single part. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>FUEL SUB LEVEL SENSOR . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>FUEL SUB LEVEL SENSOR .

Is the check result OK?

Yes : Go to 7.

No : Replace the sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>FUEL SUB LEVEL SENSOR . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>FUEL SUB LEVEL SENSOR .
CHECK CONNECTOR .
Disconnect connectors.

Is there poor contact of connector?

Yes : Repair or replace the poor contact of connector.

No : Go to 8.
CHECK DATA MONITOR .
1. Connect each connector.
2. Turn the ignition switch to ON.
3. Using the Subaru Select Monitor, read data of [Fuel level resistance] in the [Data monitor] of [Combination Meter]. Ref. to COMBINATION METER (DIAGNOSTICS)>DATA MONITOR .
Does [Fuel level resistance] indicate 0 - 480 Ω?

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 .