1997 SUBARU LEGACY ignition

OBD0145A
10AW1CONNECT SUBARU SELECT MONITOR
OR THE OBD-II GENERAL SCAN TOOL,
AND READ DATA.
1) Turn ignition switch to OFF.
2) Remove fuel filler cap.
3) Install fuel filler cap.
4) Connect Subaru Select Monitor or the OBD-II general
scan tool to data link connector.
5) Turn ignition switch to ON and Subaru Select Monitor or
the OBD-II general scan tool switch to ON.
H2M1326
6) Read the data on Subaru Select Monitor or the OBD-II
general scan tool.

Subaru Select Monitor
Designate mode using function key.
Function mode: F43

F43: Display shows pressure signal value sent from fuel
tank pressure sensor.
: Is the value less than2.8 kPa in function
mode F43?
: Go to step10AW2.
: Even if MIL lights up, the circuit has returned to a
normal condition at this time.

OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II Gen-
eral Scan Tool Instruction Manual.
B2M0535A
10AW2CHECK INPUT SIGNAL FOR ECM.
(USING VOLTAGE METER AND SUBARU
SELECT MONITOR.)
1) Measure voltage between ECM connector and chassis
ground.
: Connector & terminal
(B84) No. 21 (+)—Chassis ground ():
Is the voltage more than 4.5 V?
: Go to next step 2).
: Go to next.
257
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0927
10AW3CHECK HARNESS BETWEEN ECM AND
FUEL TANK PRESSURE SENSOR CON-
NECTOR.
1) Turn ignition switch to OFF.
2) Detach right side trunk side trim panel (Sedan) or right
side rear quarter trim panel (Wagon).
3) Remove right side rear quarter trim pocket (Wagon
model only).
4) Detach right side rear quarter insulator (Wagon model
only).
H2M1255B
5) Disconnect connector from fuel tank pressure sensor.
6) Turn ignition switch to ON.
7) Measure voltage between fuel tank pressure sensor
connector and chassis ground.
: Connector & terminal
(R47) No. 3 (+)—Chassis ground ():
Is the voltage more than 4.5 V?
: Go to next step 8).
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and fuel tank
pressure sensor connector

Poor contact in coupling connector (B97)
8) Turn ignition switch to OFF.
9) Disconnect connector from ECM.
10) Measure resistance of harness between ECM and
pressure sensor connector.
H2M1376B
: Connector & terminal
(B84) No. 20—(R47) No. 1:
Is the resistance less than 1Ω?
: Go to next step 11).
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and fuel tank
pressure sensor connector

Poor contact in coupling connector (B98)
259
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

OBD0145A
10AX1CONNECT SUBARU SELECT MONITOR
OR THE OBD-II GENERAL SCAN TOOL,
AND READ DATA.
1) Turn ignition switch to OFF.
2) Remove fuel filler cap.
3) Install fuel filler cap.
4) Connect Subaru Select Monitor or the OBD-II general
scan tool to data link connector.
5) Turn ignition switch to ON and Subaru Select Monitor or
the OBD-II general scan tool switch to ON.
H2M1326
6) Read the data on Subaru Select Monitor or the OBD-II
general scan tool.

Subaru Select Monitor
Designate mode using function key.
Function mode: F43

F43: Display shows pressure signal value sent from fuel
tank pressure sensor.
: Is the value more than 2.8 kPa in function
mode F43?
: Go to step10AX4.
: Go to step10AX2.

OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II Gen-
eral Scan Tool Instruction Manual.
B2M0535A
10AX2CHECK INPUT SIGNAL FOR ECM.
(USING VOLTAGE METER AND SUBARU
SELECT MONITOR.)
1) Measure voltage between ECM connector and chassis
ground.
: Connector & terminal
(B84) No. 21 (+)—Chassis ground ():
Is the voltage more than 4.5 V?
: Go to next step 2).
: Go to next.
262
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0927
10AX3CHECK HARNESS BETWEEN ECM AND
FUEL TANK PRESSURE SENSOR CON-
NECTOR.
1) Turn ignition switch to OFF.
2) Detach right side trunk side trim panel (Sedan) or right
side rear quarter trim panel (Wagon).
3) Remove right side rear quarter trim pocket (Wagon
model only).
4) Detach right side rear quarter insulator (Wagon model
only).
H2M1255B
5) Disconnect connector from fuel tank pressure sensor.
6) Turn ignition switch to ON.
7) Measure voltage between fuel tank pressure sensor
connector and chassis ground.
: Connector & terminal
(R47) No. 3 (+)—Chassis ground ():
Is the voltage more than 4.5 V?
: Go to next step 8).
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and fuel tank
pressure sensor connector

Poor contact in coupling connector (B97)
H2M1375B
8) Turn ignition switch to OFF.
9) Disconnect connector from ECM.
10) Measure resistance of harness between ECM and
pressure sensor connector.
: Connector & terminal
(B84) No. 4—(R47) No. 2:
Is the resistance less than 1Ω?
: Go to next.
: Repair harness and connector.
264
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

NOTE:
In this case, repair the following:

Open circuit in harness between ECM and fuel tank
pressure sensor connector

Poor contact in coupling connector (B98)
H2M1376B
: Connector & terminal
(B84) No. 20—(R47) No. 1:
Is the resistance less than 1Ω?
: Go to next.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and fuel tank
pressure sensor connector

Poor contact in coupling connector (B98)
: Is there poor contact in fuel tank pressure
sensor connector?
: Repair poor contact in fuel tank pressure sensor
connector.
: Replace fuel tank pressure sensor.
B2M0927
10AX4CHECK HARNESS BETWEEN ECM AND
FUEL TANK PRESSURE SENSOR CON-
NECTOR.
1) Turn ignition switch to OFF and Subaru Select Monitor
or the OBD-II general scan tool switch to OFF.
2) Detach right side trunk side trim panel (Sedan) or right
side rear quarter trim panel (Wagon).
3) Remove right side rear quarter trim pocket (Wagon
model only).
4) Detach right side rear quarter insulator (Wagon model
only).
265
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

H2M1326
5) Disconnect connector from fuel tank pressure sensor.
6) Remove fuel filler cap.
7) Install fuel filler cap.
8) Turn ignition switch to ON and Subaru Select Monitor or
the OBD-II general scan tool switch to ON.
9) Read data on Subaru select monitor or the OBD-II gen-
eral scan tool.

Subaru Select Monitor
Designate mode using function key.
Function mode: F43
: Is the value more than 2.8 kPa in function
mode F43?
: Repair battery short circuit in harness between
ECM and fuel tank pressure sensor connector.
: Replace fuel tank pressure sensor.

OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II Gen-
eral Scan Tool Instruction Manual.
266
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10AZ1CHECK SPEEDOMETER AND TACHOM-
ETER OPERATION IN COMBINATION
METER.
: Does speedometer and tachometer operate
normally?
: Go to step10AZ3.
: Go to step10AZ2.
B6M0121
10AZ2CHECK GROUND CIRCUIT OF COMBINA-
TION METER.
1) Turn ignition switch to OFF.
2) Pull out combination meter from instrument panel. to 6-2 [W13A1].>
3) Disconnect connector from combination meter.
B2M0934A
4) Measure resistance of harness between combination
meter connector and chassis ground.
: Connector & terminal
(i12) No. 1—Chassis ground:
Is resistance less than 5Ω?
: Repair or replace combination meter.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between combination meter con-
nector and grounding terminal

Poor contact in combination meter connector

Poor contact in grounding terminal
270
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

H2M1414B
10AZ3CHECK INPUT SIGNAL FOR ECM.
(USING VOLTAGE METER AND SUBARU
SELECT MONITOR.)
1) Turn ignition switch to ON. (Engine OFF)
2) Measure voltage between ECM connector and chassis
ground.
: Connector & terminal
(B84) No. 27 (+)—Chassis ground ():
Is the voltage less than 0.12 V?
: Go to step10AZ4.
: Go to next.
H2M1327
: Does the value change less than 0.12 V by
shaking harness and connector of ECM
while monitoring the value with Subaru
Select Monitor?

Subaru Select Monitor
Designate mode using function key.
Function mode: F45

F45: Fuel level sensor output signal is indicated.
: Repair poor contact in ECM connector.
: Even if MIL lights up, the circuit has returned to a
normal condition at this time. A temporary poor
contact of the connector may be the cause.
NOTE:
In this case, repair the following:

Poor contact in fuel pump connector

Poor contact in combination meter connector

Poor contact in ECM connector

Poor contact in coupling connector (i3, B99, B22, B98
and R57)
G2M0340
10AZ4CHECK HARNESS BETWEEN ECM, COM-
BINATION METER AND FUEL PUMP
CONNECTOR.
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).
271
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles