1996 SUBARU LEGACY Fuel system

G2M0863
10BP5
CHECK FUEL SUB LEVEL SENSOR.
1) Remove service hole cover located on the left rear of
trunk compartment floor (Sedan) or luggage compartment
floor (Wagon).
B2M0936
2) Disconnect connector from fuel sub meter unit.
3) Measure resistance between connector terminals of
fuel sub meter unit.
: Terminals
No. 1—No. 2:
Is the resistance less than 100Ω?
: Go to step10BP6.
: Replace fuel sub meter unit.
B2M0937A
10BP6CHECK HARNESS BETWEEN FUEL
PUMP AND FUEL SUB METER UNIT
CONNECTOR.
Measure resistance of harness between fuel pump and fuel
sub meter unit connector.
: Connector & terminal
(R58) No. 3—(R59) No. 2:
Is the resistance less than 1Ω?
: Go to step10BP7.
: Repair open circuit in harness between fuel pump
and fuel sub meter unit connector.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0938A
10BP7CHECK GROUND CIRCUIT OF FUEL
LEVEL SENSOR.
Measure resistance of harness between fuel pump con-
nector and chassis ground.
: Connector & terminal
(R58) No. 5—Chassis ground:
Is the resistance less than 5Ω?
: Go to step10BP8.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between fuel pump connector
and chassis grounding terminal

Poor contact in fuel pump connector

Poor contact in coupling connectors (R57, B98 (LHD)/
B97 (RHD), and B22)
B2M0939A
10BP8CHECK HARNESS BETWEEN ECM AND
FUEL PUMP CONNECTOR.
1) Connect connector to fuel sub meter unit.
2) Turn ignition switch to ON.
3) Measure voltage between fuel pump connector and
chassis ground.
: Connector & terminal
(R58) No. 3 (+)—Chassis ground ():
Is the voltage less than 1 V?
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between fuel pump connector
and junction A on rear wiring harness

Poor contact in fuel sub meter unit connector

Poor contact in fuel pump connector

Poor contact in coupling connector (R57)
: Go to next step 4).
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

H2M1418B
4) Turn ignition switch to OFF.
5) Disconnect connector from ECM.
6) Turn ignition switch to ON.
7) Measure voltage between ECM connector and chassis
ground.
: Connector & terminal
(B84) No. 27 (+)—Chassis ground:
Is the voltage less than 1 V?
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM connector and
junction A on rear wiring harness

Poor contact in coupling connector (B98 (LHD)/B97
(RHD))
: Repair connector.
NOTE:
In this case, repair the following:

Poor contact in fuel pump connector

Poor contact in fuel sub meter unit

Poor contact in ECM connector
G2M0340
10BP9CHECK HARNESS BETWEEN ECM, COM-
BINATION METER AND FUEL PUMP
CONNECTOR. (LHD MODEL)
1) Turn ignition switch to OFF.
2) Remove fuel pump access hole lid located on the right
rear of trunk compartment floor (Sedan) or luggage com-
partment floor (Wagon).
B2M0940A
3) Disconnect connector from fuel pump.
4) Measure resistance of harness between fuel pump con-
nector and chassis ground.
: Connector & terminal
(R58) No. 3—Chassis ground:
Is the resistance less than 10Ω?
: Go to next step 5).
: Go to step10BP11.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

G2M0863
5) Remove service hole cover located on the left rear of
trunk compartment floor (Sedan) or luggage compartment
floor (Wagon).
B2M0940A
6) Disconnect connector from fuel sub meter unit.
7) Measure resistance of harness between fuel pump con-
nector and chassis ground.
: Connector & terminal
(R58) No. 3—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between fuel pump
and fuel sub meter unit connector.
: Go to next step 8).
B2M0941A
8) Separate fuel tank cord connector (R57) and rear wir-
ing harness connector (R15).
9) Measure resistance of harness between fuel sub meter
unit connector and chassis ground.
: Connector & terminal
(R59) No. 1—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in fuel tank cord.
: Go to next step 10).
B2M0942A
10) Separate rear wiring harness connector (R2) and bulk-
head wiring harness connector (B98).
11) Measure resistance of harness between rear wiring
harness connector and chassis ground.
: Connector & terminal
(R15) No. 3—Chassis ground:
Is the resistance less than 10Ω?
: Go to next step 12).
: Repair short circuit in bulkhead wiring harness.
B2M0943A
12) Separate rear wiring harness connector (R3) and bulk-
head wiring harness connector (B99).
13) Measure resistance of harness between rear wiring
harness connector and chassis ground.
: Connector & terminal
(R3) No. 20—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in rear wiring harness.
: Go to next step 14).
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0944A
14) Separate bulkhead wiring harness connector (B38)
and instrument panel wiring harness connector (i3).
15) Measure resistance of harness between bulkhead wir-
ing harness connector and chassis ground.
: Connector & terminal
(B99) No. 20—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in bulkhead wiring harness.
: Repair short circuit in instrument panel wiring har-
ness.
G2M0340
10BP10CHECK HARNESS BETWEEN ECM, COM-
BINATION METER AND FUEL PUMP
CONNECTOR. (RHD MODEL)
1) Turn ignition switch to OFF.
2) Remove fuel pump access hole lid located on the right
rear of luggage compartment floor.
B2M0940A
3) Disconnect connector from fuel pump.
4) Measure resistance of harness between fuel pump con-
nector and chassis ground.
: Connector & terminal
(R58) No. 3—Chassis ground:
Is the resistance less than 10Ω?
: Go to next step 5).
: Go to step10BP11.
G2M0863
5) Remove service hole cover located on the left rear of
luggage compartment floor.
B2M0940A
6) Disconnect connector from fuel sub meter unit.
7) Measure resistance of harness between fuel pump con-
nector and chassis ground.
: Connector & terminal
(R58) No. 3—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between fuel pump
and fuel sub meter unit connector.
: Go to next step 8).
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0941A
8) Separate fuel tank cord connector (R57) and rear wir-
ing harness connector (R15).
9) Measure resistance of harness between fuel sub meter
unit connector and chassis ground.
: Connector & terminal
(R59) No. 1—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in fuel tank cord.
: Go to next step 10).
B2M0942A
10) Separate rear wiring harness connector (R1) and bulk-
head wiring harness connector (B97).
11) Measure resistance of harness between rear wiring
harness connector and chassis ground.
: Connector & terminal
(R15) No. 3—Chassis ground:
Is the resistance less than 10Ω?
: Go to next step 12).
: Repair short circuit in rear wiring harness.
B2M1022A
12) Measure resistance of harness between bulkhead wir-
ing connector and chassis ground.
: Connector & terminal
(B97) No. J2—Chassis ground:
Is the resistance less than 10Ω?
: Go to next step 13).
: Repair short circuit in harness between S.M.J.
and ECM connector.
B2M1022A
13) Separate bulkhead wiring harness connector (B38)
and instrument panel wiring harness connector (i3).
14) Measure resistance of harness between bulkhead wir-
ing harness connector and chassis ground.
: Connector & terminal
(B97) No. J2—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in bulkhead wiring harness.
: Repair short circuit in instrument panel wiring har-
ness.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B6M0121
10BP11CHECK HARNESS BETWEEN COMBINA-
TION METER AND FUEL PUMP CONNEC-
TOR.
1) Connect connector to fuel pump.
2) Pull out combination meter from instrument panel. to 6-2 [W13A1].>
3) Disconnect connector from combination meter.
B2M0945A
4) Measure resistance of harness between combination
meter connector and chassis ground.
: Connector & terminal
(i10) No. 3—Chassis ground:
Is the resistance less than 200Ω?
: Go to step10BP12.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between combination meter con-
nector and junction A on rear wiring harness

Poor contact in coupling connectors (i3, and B99 (LHD)/
B97 (RHD))
10BP12
CHECK COMBINATION METER.
1) Disconnect speedometer cable from combination meter
and remove combination meter.
: Is the fuel meter installation screw tightened
securely?
: Go to next step 2).
: Tighten fuel meter installation screw securely.
2) Remove printed circuit plate assembly from combina-
tion meter assembly.
: Is there flaw or burning on printed circuit
plate assembly?
: Replace printed circuit plate assembly.
: Replace fuel meter assembly.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0947
BV: DTC P0461
—FUEL LEVEL SENSOR CIRCUIT RANGE/
PERFORMANCE PROBLEM (EXERR22)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
10BV1Check DTC P1402 on display.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:

LHD Model
B2M0933
368
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code